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Sample records for mercado pluton coahuila

  1. Mining and society in Coahuila. Mineria y sociedad en Coahuila

    Energy Technology Data Exchange (ETDEWEB)

    Canales Santos, A.

    1991-09-15

    The best studies on mining in the Republic of Mexico show that mining played a very important role in setting in motion the economic development and expansion of colonial Mexico. Very little is known about this industry in the state of Coahuila, however, with regard to its history and economy and how it interacted with the economy of the new Spanish America. This makes Coahuila a suitable region on which to carry out a study. 24 refs.

  2. Maquila y sindicatos en Ciudad Acuña,Coahuila

    Directory of Open Access Journals (Sweden)

    Cirila Quintero Ramírez

    2000-01-01

    Full Text Available Este artículo muestra la continuidad en la preferencia de las ciudades fronterizas, a pesar de poder establecerse en cualquier país, para la instalación de maquiladoras. A través del análisis de Ciudad Acuña, Coahuila, el trabajo muestra cómo el gobierno y el empresariado locales han convertido a la actividad maquiladora en el eje central de la economía acuñense en un tiempo relativamente corto. El estudio también enfatiza cómo la posición geográfica de la localidad, así como la debilitación sindical han constituido algunos de los principales componentes de este crecimiento maquilador. A pesar de éste y de las promisorias expectativas que vislumbran los empresarios en torno al futuro maquilador, el trabajo enuncia algunas características industriales y del mercado laboral local que parecen cuestionar dicho optimismo empresarial.

  3. Sierra Madre Oriental in Coahuila, Mexico

    Science.gov (United States)

    2002-01-01

    This desolate landscape is part of the Sierra Madre Oriental mountain range, on the border between the Coahuila and Nuevo Leon provinces of Mexico. This image was acquired by Landsat 7's Enhanced Thematic Mapper plus (ETM+) sensor on November 28, 1999. This is a false-color composite image made using shortwave infrared, infrared, and green wavelengths. The image has also been sharpened using the sensor's panchromatic band. Image provided by the USGS EROS Data Center Satellite Systems Branch

  4. Amphibians and reptiles of the state of Coahuila, Mexico, with comparison with adjoining states

    OpenAIRE

    Lemos-Espinal, Julio A.; Smith, Geoffrey R.

    2016-01-01

    Abstract We compiled a checklist of the amphibians and reptiles of the state of Coahuila, Mexico. The list comprises 133 species (24 amphibians, 109 reptiles), representing 27 families (9 amphibians, 18 reptiles) and 65 genera (16 amphibians, 49 reptiles). Coahuila has a high richness of lizards in the genus Sceloporus . Coahuila has relatively few state endemics, but has several regional endemics. Overlap in the herpetofauna of Coahuila and bordering states is fairly extensive. Of the 132 sp...

  5. Geology of the border region between Coahuila and Zacatecas, Mexico

    NARCIS (Netherlands)

    Vloten, van Roger

    1954-01-01

    The border region between Coahuila and Zacatecas is part of the mountainous country south of Parras in northeastern Mexico. It includes a thickness of about 2,600 meters of Jurassic and Cretaceous rocks that were deposited along the northern border of the Mexican geosyncline along the southern

  6. Livre mercado

    Directory of Open Access Journals (Sweden)

    Müller, Lúcia Helena Alves

    2003-01-01

    Full Text Available Este artigo é resultado de uma etnografia que foi realizada junto ao mercado de ações brasileiro. Através da análise do funcionamento do pregão da bolsa de valores de São Paulo, das diferentes instituições financeiras que conformam este mercado e das trajetórias dos profissionais neste universo, busco demonstrar como são produzidas as condições sociais para a existência de um espaço de trocas que tem como princípio ordenador e legitimador o modelo teórico do mercado perfeito, formulado pela escola econômica neoclássica

  7. Amphibians and reptiles of the state of Coahuila, Mexico, with comparison with adjoining states.

    Science.gov (United States)

    Lemos-Espinal, Julio A; Smith, Geoffrey R

    2016-01-01

    We compiled a checklist of the amphibians and reptiles of the state of Coahuila, Mexico. The list comprises 133 species (24 amphibians, 109 reptiles), representing 27 families (9 amphibians, 18 reptiles) and 65 genera (16 amphibians, 49 reptiles). Coahuila has a high richness of lizards in the genus Sceloporus. Coahuila has relatively few state endemics, but has several regional endemics. Overlap in the herpetofauna of Coahuila and bordering states is fairly extensive. Of the 132 species of native amphibians and reptiles, eight are listed as Vulnerable, six as Near Threatened, and six as Endangered in the IUCN Red List. In the SEMARNAT listing, 19 species are Subject to Special Protection, 26 are Threatened, and three are in Danger of Extinction. Coahuila is home to several species of conservation concern, especially lizards and turtles. Coahuila is an important state for the conservation of the native regional fauna.

  8. El impacto de la reestructuración económica en Coahuila

    NARCIS (Netherlands)

    L. de Bell

    2008-01-01

    This article focuses in particular on the recent economic dynamism of the state of Coahuila, situated directly along the US-Mexican border. Since the mid-1970s, the development strategy of Coahuila’s administrative elites has become increasingly centred on creating favourable conditions for foreign

  9. Propuesta para el desarrollo turístico: una oportunidad de negocio, pymes y la comunidad en general del municipio de Cuatro Ciénegas, Coahuila

    Directory of Open Access Journals (Sweden)

    Sandra Patricia de la Garza Cien Fuegos

    2016-03-01

    Full Text Available Coahuila es un estado que no deja de sorprendernos; las rutas turísticas descubren riqueza natural y cultural de un territorio en el que la diversidad del paisaje, la tradición y hospitalidad hacen un espacio ideal para el turismo. En esta investigación se presenta un estudio exploratorio de clúster turístico de la región centro del estado de Coahuila beneficiando a pequeñas y medianas empresas que ofrecen servicios especializados. El tipo de estructura empresarial abarca desde empresas medianas que aprovechan economías de escala en áreas como distribución de productos y servicios, hasta empresas pequeñas que se orientan hacia pequeños nichos de mercado, incluyendo productos y servicios. De esta forma se complementan mutuamente. La idea motivadora de este estudio es presentar una propuesta de un parque turístico para el desarrollo de pymes y comunidad.

  10. Delays in the diagnosis of pulmonary tuberculosis in Coahuila, Mexico.

    Science.gov (United States)

    Salinas, J; Calvillo, S; Caylà, J; Nedel, F B; Martín, M; Navarro, A

    2012-09-01

    To determine diagnostic delay in pulmonary tuberculosis (PTB) cases and analyse associated factors. New PTB cases were studied in Coahuila, Northern Mexico, between 2008 and 2009. We obtained census data and data on residential address, symptoms and diagnosis from the national patient database; sociodemographic variables were obtained during home visits. Bivariate analyses used the Kaplan-Meier method; multivariate analysis consisted of modelling survival. We studied 458 subjects (median age 48 years), who were predominantly males (56.1%); the median years of schooling was 6.0 years, 83.4% were urban residents, 50.3% were unemployed, and 87.7% suffered from food poverty. The median delay between the onset of symptoms and the first medical consultation was 53.5 days. Lack of formal education (P = 0.050) and living ≥5 km from a health unit (P = 0.034) were associated with longer delays and consequently with severe symptoms (cough ≥2 weeks, P = 0.001; chest pain, P = 0.032; malnutrition, P = 0.003). Mean health system delay (between first consultation and smear test result) was 18.5 days, and was significantly longer when the first consultation was with a private physician (P < 0.001) and when patient age was ≥46 years (P = 0.001). In Coahuila, lack of formal education, living ≥5 km from a health unit, first consultation with a private physician, and being aged ≥46 years contributed to delays in PTB diagnosis.

  11. Renewable energy load assessment for Boquillas Del Carmen Coahuila, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Foster, R. [Southwest Technology Development Institute, Las Cruces, NM (United States)

    1995-08-01

    This report outlines the estimates that were made in 1992 of the potential load requirements for Boquillas del Carmen, a small Mexican village on the northern border of the state of Coahuila, Mexico near Big Bend National Park in southern Texas. The study was made to help determine the possibility that village might be electrified by solar or wind energy. Various estimates of are given of the potential load based on estimates ranging from basic use of lights, radio, television, and small household appliances to microwave ovens, refrigerators, and direct evaporative coolers. The low-energy consumption case was estimated to be at 23.0 kWh/month per residence per month, and the high-energy consumption case (with cooling) was 140.7 kWh/month per residence. On average, the typical residence is occupied by five individuals.

  12. Correct nomenclature for the Angadimogar pluton, Kerala ...

    Indian Academy of Sciences (India)

    The proper usage of modal composition and geochemical classification of granitoids is discussed for assigning a proper nomenclature for the Angadimogar pluton, Kerala, southwestern India. This discussion is mainly aimed at addressing questions concerning the nomenclature of Angadimogar pluton (syenite vs. granite).

  13. The Study of enclaves and relative age of plutonic bodies in the Alvand Plutonic complex

    International Nuclear Information System (INIS)

    Sepahi Gerow, A. A.; Moien-Vaziri, H.

    2000-01-01

    The study of enclaves and field observations indicate that: The Alvand plutonic complex comprise several plutonic phases with sharp contact and different ages. The older plutonic rocks are composed of gabbro, diorite and tonalites. The porphyroid granites were formed at least in two phases and they are younger than gabbros, diorites and tonalites. The hololeucocratic granitoids were also formed in two phases and they are the youngest plutonic phase in the Alvand plutonic complex. The granitic rocks are magmatic and they are not metasomatic in origin. The porphyroid granites (monzogranites and granodiorites) are S-type (Anatexites). According to radiometric ages and relative ages we believe that mafic plutonism have occurred during pre-middle Cretaceous to Paleocene ages and felsic plutonism have occurred during middle Cretaceouc to Paleocene ages

  14. Los mercados financieros

    OpenAIRE

    Franco Bendeck, Henry David; Guzmán Salazar, Laura Steffi

    2017-01-01

    En este documento el lector encontrará una visión general y un punto de partida sobre el funcionamiento de los mercados financieros de dinero y capitales, abordando la teoría en cuanto a la estructura y funcionamiento del sistema de valores intercambiario, además de aspectos como la psicología de sus participantes y la actualidad de algunos de los mercados muy poco desarrollados como el caso de los latinoamericanos. Estos aspectos hacen parte del contexto de inversión en los mercados, e...

  15. Mercado municipal Can Vidalet

    OpenAIRE

    Romero Francisco, Jorge

    2006-01-01

    La intención del nuevo mercado municipal de Can Vidalet es crear un escenario en sombra, envuelto por una piel permeable; una "cesta" dentro de la cual se produce una actividad comercial. La topografía del lugar permite establecer un esquema comercial en sección, situando el mercado tradicional en cota superior y el nuevo uso comercial en planta baja, a nivel de plaza pública.

  16. Mercado de Algeciras

    Directory of Open Access Journals (Sweden)

    Torroja, Eduardo

    1962-02-01

    Full Text Available Siguiendo las líneas generales del Anteproyecto aprobado por el Excmo. Ayuntamiento de Algeciras, se proyectó el nuevo Mercado con una planta octogonal inscrita en el polígono que forman las cuatro calles de contorno. De este modo se obtiene una sala de gran utilización para los puestos de venta, sin rincones difíciles de acceso; y la entrada desde los cuatro lados se obtiene fácilmente, descongestionando así la circulación en los alrededores del Mercado. Esta circulación se facilita, también, con los chaflanes que en las esquinas de las calles presentan cuatro lados del octógono, y que, sin perjudicar a los servicios interiores, permite dar mayor amplitud a las aceras, punto importante dadas las aglomeraciones que suelen producirse en los alrededores de estos mercados en las horas de compra.

  17. Petrology and radiogeology of the Stripa pluton

    Energy Technology Data Exchange (ETDEWEB)

    Wollenberg, H.; Flexser, S.; Andersson, L.

    1980-12-01

    Both the quartz monzonite and the metavolcanic leptite which it intruded are strongly fractured. Two stages of fracture filling are evident; an earlier stage encompassing quartz, sericite, feldspar, epidote, and chlorite, and a later stage dominated by carbonate minerals. The Stripa quartz monozite is chemically and mineralogically distinct from other plutons in the region. Muscovite is the predominant mica in the quartz monzonite; biotite has been altered to chlorite, hornblende is absent, and accessory minerals are scarce. In contrast, in other plutons in the Stripa region, biotite and hornblende are prominent mafic minerals and accessory minerals are abundant. The Stripa quartz monzonite is also considerably more radioactive than the the leptite and other plutons in the region. Uranium and thorium abundances are both approx. 30 ppM, considerably higher than in normal granitic rocks where the thorium-to-uranium ratio generally exceeds 2. Potassium-argon dating of muscovite from the Stripa quartz monzonite indicates that this rock may be older, at 1691 million years than granitic rock of the neighboring Gusselby and Kloten massifs, whose ages, based on K-Ar dating of biotite, are respectively 1604 and 1640 m.y. Heat flow and heat productivity considerations show that although Stripa quartz monzonite contains high abundances of radioelements, the pluton has little efect on the regional heat flow. If it occurs in a layered plutonic setting, it is not more than 1.5 km thick; otherwise it may comprise a stock, dike, or border phase that is relatively small compared with the large granitic plutons exposed in the region.

  18. EDUCACION, MERCADO Y CIUDADANIA

    Directory of Open Access Journals (Sweden)

    Juan Carlos Tedesco

    1998-01-01

    Full Text Available El criterio referencial, presente a lo largo del texto, es la imposibilidad e inconveniencia de dar respuestas categóricas y únicas a los complejos problemas educativos contemporáneos. Desde esta postura, el autor aborda tres temas educativos, permeados por la relación mercado, equidad y ciudadanía; son expuestos por separado pero están articulados: la toma de decisiones para asignar recursos y cuotas de acceso a la educación y el debate entre concertación y mercado; la equidad educativa, lo que lleva a realzar el debate sobre el papel de la acción estatal y la privada; los contenidos que en la actualidad han de caracterizar a los procesos educativos, lo que remite a considerar divergencias y cercanías entre formación ciudadana y formación para la competitividad.

  19. Bullialdus - Strengthening the case for lunar plutons

    Science.gov (United States)

    Pieters, Carle M.

    1991-01-01

    Although many craters expose materials of a composition different from that of the local surroundings, Bullialdus has excavated material representing three distinct stratigraphic zones that occur in the upper 6 km of crust, the top two of which are gabbroic and the deepest of which is noritic. This three-component stratigraphy at Bullialdus provides strong evidence that the lunar crust includes pockets of compositionally layered material reminiscent of mafic layered plutons. When combined with previous information on the compositional diversity at other large craters, these remote analyses obtained in a geologic context substantially strengthen the hypothesis suggested from lunar samples that plutons play an integral role in lunar crustal evolution.

  20. Hydrogeological behavior of the Cuatrocienegas and El Hundido aquifers in Coahuila, Mexico; Comportamiento hidrogeologico de los acuiferos Cuatrocienegas y el Hundido, Coahuila, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Aldama, Alvaro A; Aparicio, Javier; Gutierrez-Ojeda, Carlos [Instituto Mexicano de Tecnologia del Agua (Mexico)] (and others)

    2007-07-15

    The El Hundido aquifer, in Coahuila, Mexico, has been increasingly exploited by groundwater pumping since the beginning of the year 2001, mainly for agricultural purposes. Therefore, there is concern about the possible negative effects on the adjoining Cuatrocienegas aquifer, which lies under the Cuatrocienegas Natural Protected Area, a site containing a great variety of endemic species. The objective of this research was to evaluate the hydrodynamic, isotopic, and geochemical behavior of the El Hundido aquifer and the possible hydraulic interaction with the Cuatrocienegas aquifer in Coahuila. To fulfill this objective, field, office, and laboratory activities were carried out. The field work included a well census, nine infiltration tests, one pumping test, well hydrometry, a topographical leveling survey of 40 wells, geophysical soundings, a geological field survey, the drilling of two test wells to depths of 200 and 250 m, and the taking of 103 surface- and groundwater samples for hydrochemical and isotopic analyses. The main results of the study are as follows: 1) There is a hydrodynamical divide between the groundwater of the Cuatrocienegas aquifer and the El Hundido aquifer; 2) The groundwater of the Cuatrocienegas aquifer is isotopically distinct from that of the El Hundido aquifer; 3) Groundwater salinity in both valleys is due to the dissolution of the underlying rocks of marine origin; 4) The groundwater source in both valleys is rainwater; while the main water source feeding the Cuatrocienegas springs is precipitation falling on the La Fragua and the San Marcos mountain ranges. [Spanish] El acuifero de El Hundido, Coahuila, ha experimentado desde principios de 2001 un incremento de la explotacion de agua subterranea, principalmente para usos agricolas. Debido a ello, existe preocupacion por los posibles efectos de esta explotacion sobre el acuifero adyacente de Cuatrocienegas, el cual subyace al Area de Proteccion de Flora y Fauna Cuatrocienegas, que

  1. Petrology and radiogeology of the Stripa pluton

    International Nuclear Information System (INIS)

    Wollenberg, Harold; Flexser, Steve; Andersson, Lennart

    1980-01-01

    To better define the character of the rock encompassing the thermomechanical and hydrological experiments at the Stripa mine in central Sweden, and to help determine the size of the Stripa pluton, detailed studies were conducted of the petrology and radiogeology of the quartz monzonite and adjacent rocks. Petrologic studies emphasized optical petrography, with supplementary X-ray diffraction, X-ray fluorescence and microprobe analyses. Radiogeologic investigations were based primarily on surface and underground gamma-ray spectrometric measurements of uranium, thorium and potassium, supplemented by laboratory gamma spectrometric analyses and fission-track radiographic determinations of the locations and abundance of uranium in the rock matrix. Both the quartz monzonite and the metavolcanic leptite which it intruded are strongly fractured. Two stages of fracture filling are evident; an earlier stage encompassing quartz, sericite, feldspar, epidote, and chlorite, and a later stage dominated by carbonate minerals. The Stripa quartz monzonite is chemically and mineralogically distinct from other plutons in the region. Muscovite is the predominant mica in the quartz monzonite; biotite has been altered to chlorite, hornblende is absent, and accessory minerals are scarce. In contrast, in other plutons in the Stripa region biotite and hornblende are prominent mafic minerals and accessory minerals are abundant. The Stripa quartz monzonite is also considerably more radioactive than the leptite and other plutons in the region. Uranium and thorium abundances are both- 30 ppm, considerably higher than in 'normal' granitic rocks where the thorium-to-uranium ratio generally exceeds 2. Potassium-argon dating of muscovite from the Stripa quartz monzonite indicates that this rock may be older, at 1691 million years than granitic rock of the neighboring Gusselby and Kloten massifs, whose ages, based on K-Ar dating of biotite, are respectively 1604 and 1640 m.y. Heat flow and heat

  2. Petrology and radiogeology of the Stripa pluton

    Energy Technology Data Exchange (ETDEWEB)

    Wollenberg, Harold; Flexser, Steve; Andersson, Lennart

    1980-12-01

    To better define the character of the rock encompassing the thermomechanical and hydrological experiments at the Stripa mine in central Sweden, and to help determine the size of the Stripa pluton, detailed studies were conducted of the petrology and radiogeology of the quartz monzonite and adjacent rocks. Petrologic studies emphasized optical petrography, with supplementary X-ray diffraction, X-ray fluorescence and microprobe analyses. Radiogeologic investigations were based primarily on surface and underground gamma-ray spectrometric measurements of uranium, thorium and potassium, supplemented by laboratory gamma spectrometric analyses and fission-track radiographic determinations of the locations and abundance of uranium in the rock matrix. Both the quartz monzonite and the metavolcanic leptite which it intruded are strongly fractured. Two stages of fracture filling are evident; an earlier stage encompassing quartz, sericite, feldspar, epidote, and chlorite, and a later stage dominated by carbonate minerals. The Stripa quartz monzonite is chemically and mineralogically distinct from other plutons in the region. Muscovite is the predominant mica in the quartz monzonite; biotite has been altered to chlorite, hornblende is absent, and accessory minerals are scarce. In contrast, in other plutons in the Stripa region biotite and hornblende are prominent mafic minerals and accessory minerals are abundant. The Stripa quartz monzonite is also considerably more radioactive than the leptite and other plutons in the region. Uranium and thorium abundances are both- 30 ppm, considerably higher than in "normal" granitic rocks where the thorium-to-uranium ratio generally exceeds 2. Potassium-argon dating of muscovite from the Stripa quartz monzonite indicates that this rock may be older, at 1691 million years than granitic rock of the neighboring Gusselby and Kloten massifs, whose ages, based on K-Ar dating of biotite, are respectively 1604 and 1640 m.y. Heat flow and heat

  3. Deslumbramientos del mercado

    Directory of Open Access Journals (Sweden)

    Monique Selim

    2006-07-01

    Full Text Available Con eje en los diferentes aspectos que adopta el actual proceso de mundialización de la lógica del mercado y expansión capitalista, aún en países socialistas, el presente artículo plantea la necesidad de una reflexión antropológica susceptible de articular el surgimiento de nuevas formas de dominación y representación simbólicas. Se discute el aparente efecto de unificación intelectual producido por la hegemonía del mercado respecto de hechos sociales heterogéneos dados en la historia reciente de las sociedades contemporáneas. Así, la renovada atracción que ejercen los nuevos escenarios sociales reconfigurados en virtud de las modalidades específicas de encarnación y operación de los procesos globalizantes, llama al estudio antropológico de las coyunturas. La autora despliega una interpretación del socialismo de mercado, conjunción -siempre en tensión- de un monopolio político estatal y una liberalización del mercado económico. En esta perspectiva se reubica el interés de una antropología del presente en relevar localmente, en este caso en Vietnam del Norte, la conformación de un nuevo mercado de demandas simbólicas, donde la reaparición de las prácticas culturales de comunicación con los antepasados expresa la necesidad de reunificación familiar y reconciliación con los muertos en la "larga guerra".Tendo como eixo os aspectos diferentes que adota o processo atual de mundialização da lógica do mercado e de expansão capitalista, até mesmo nos países socialistas, este artigo propoe a necessidade de uma reflexão antropológica capaz de articular o aparecimento de novas formas de dominação e de representação simbólica. Discute-se o efeito de superfície de unificação intelectual causado pela hegemonia do mercado em fatos sociais diversos em sociedades contemporâneas. Assim, a atração renovada de novos fatos sociais pelos modos específicos de incorporação e operação de processos de globaliza

  4. El suicidio en la región sureste del estado de Coahuila

    OpenAIRE

    Jana Petrzelová Mazacová; Mayra Aracely Chávez Martínez

    2006-01-01

    En virtud del alarmante aumento de suicidios en la región sureste del estado de Coahuila (México) durante los años 2002 y 2003, se realizó un estudio para encontrar algunos denominadores comunes como causas de este fenómeno. Dicho estudio constó de dos fases: en la primera se contextualizó el problema y se obtuvieron datos epidemiológicos; la segunda consistió en realizar entrevistas a profundidad para establecer necropsias psicológicas a través de las historias de vida de l...

  5. Mercado primario de valores negociables

    OpenAIRE

    Alonso Espinosa, Francisco José

    1994-01-01

    Estudio del régimen del mercado primario de valores según la Ley 24/1988, del Mercado de Valores y el RD 291/1992, de 27 de marzo. Caracterización de los valores negociables y estudio del régimen de la oferta pública de suscripción de valores negociables.

  6. El impacto del Tratado de Libre Comercio entre México, Estados Unidos y Canadá en el sector agropecuario de Coahuila

    Directory of Open Access Journals (Sweden)

    René Vidaurrázaga Obezo

    1997-02-01

    Full Text Available This paper analyzes the importance that has the agricultural sector in the Coahuila economy; the impact of the North America Free Trade Agreement (NAFTA in this sector as much as the perspectives with the NAFT Aoperation. The agrícultural sector of Coahuila is straggling in comparison with the other economic sectors of the state, and of agricultural activities of other regions of the country such as the Northwest and even more United States of America and Canada. In this conditions that you find the agricultural sector of Coahuila and if the same polices continued for the agrícultural, the competition process with the North AmericaFree Trade Agreement operation will not present in all their expansion at time expiration the agreement period to open the border totally. Of the joint branch that malees the agrícultural sector of Coahuila, few of them have the possibilities of competing in the internalional market.

  7. Genesis of felsic plutonic magmas and their igneous enclaves

    DEFF Research Database (Denmark)

    Clemens, John D.; Maas, Roland; Waight, Tod Earle

    2016-01-01

    -type Pyalong pluton was emplaced, apparently along an east-west-orientated fracture zone. Around 367 Ma, the main I-type Baynton pluton intruded as numerous shallow-dipping sheets. The last plutonic event was the intrusion of the broad, thin, flat-lying, and crosscutting sheet of the I-type Beauvallet pluton...... the relatively high abundance of igneous-textured microgranular enclaves (MEs). The MEs show neither chemical nor isotope mixing trends with each other or with the host magmas. Variations in the Baynton magmas were derived from the heterogeneity of the source terrane, with individual magma batches formed from...

  8. Entorno laboral y social en las maquiladoras de Coahuila: estudio muestral

    Directory of Open Access Journals (Sweden)

    Alarcon, G

    2006-01-01

    Full Text Available The purpose of this study is to analyze the labor and social environment that prevails in the maquiladoras (assemble plants located in the northern border states of México, particularly in the state of Coahuila; also it is addressed the importance of factors contributing to improve labor conditions and productivity. The study is based in a sample of 20 firms located in the counties of Saltillo, Ramos Arizpe, Monclova, Torreón, Sabinas, Piedras Negras and Ciudad Acuña. This study analizes the main socialeconomic figures of the workers, their labor conditions in regard to labor security, training, rights and duties, social security and social environment in which they live in. Conclusions and recommendations are related to improving training and labor conditions, as well as fostering a new labor culture, health, social security and social environment.

  9. Military and civilian colonies of the XIX Century: approach to urban utopias in northern Coahuila

    Directory of Open Access Journals (Sweden)

    Alejandro González Milea

    2012-01-01

    Full Text Available The article sustains that, in North Coahuila, during xix century, the new population centers were influenced by military colonies reglamentos. A revision of its measures and dispositions, also with the case study of El Remolino –and other civil and repatriated colonies–, it is possible to corroborate a familiar idea which states that the Mexican utopias were inspired from a tradition formed of short resumes of collective ideals, but were not creative exercises of imagination or idle fables. The recurrent using of damero –a square trace of streets and blocks– permits to advance in the definition of an ideal city type that its necessary to incorporate to the urbanism and planning history of Nord–eastern Mexico, because it associates a conscience of the population needs with an artistic unity conception.

  10. Petrological studies of plutonic rocks of Ecuador

    International Nuclear Information System (INIS)

    Aly, S.

    1980-01-01

    The feldspars of many tonalitic plutonic rocks in the coastal regions and West Andean regions are zoned. This leads to the conclusion that they are relatively flat intrusions and to some extent transition rocks in the subvulcanite direction. This is in accordance with the genetic and chronological relationship between plutonites and the surrounding vulcanites of the Basic Igreous Complex (BIC). The composition of representative minerals, e.g. alkali feldspar, plagioclase feldspar, biotite, chlorite, and amphibole has been determined as well as the age of plutonite samples by the K/Ar dating method. (DG) [de

  11. Discussion on geochemical characteristics and tectonic setting of Maofeng pluton

    International Nuclear Information System (INIS)

    Wu Yi; Ruan Kun; Cai Jiajia; Liu Jing; Li Haidong; Zhang Lu; Wang Xiaona

    2014-01-01

    Xiazhuang granite type uranium deposit is the most important one in South China. The closest relation with Xiazhuang uranium mineralization is Maofeng granite pluton. To expound the relationship of granite and uranium mineralization, the paper studied Maofeng granite pluton which is the host granite of the deposit in petrogeochemistry, its structure and geodynamic setting. (authors)

  12. Mercado municipal en Sant Quirze

    OpenAIRE

    Redondo Díez, Laura

    2010-01-01

    El proyecto satisface la necesidad de un Mercado Municipal en Sant Quirze. Situado en el actual recinto ferial del pueblo, el parque de la Betzuca, un punto céntrico cerca del casco antiguo y de las nuevas urbanizaciones. Las condiciones del lugar enriquecen el proyecto permitiendo usos múltiples muy adecuados a cada banda del solar: zona de mercado, galerías exteriores, supermercado, guardería, restaurante y bares vinculados a la zona del río, almacenes, zonas de carga y descarga y un gra...

  13. Cooling history of nested plutons from the Variscan Tichka plutonic complex (Morocco)

    Science.gov (United States)

    Lécuyer, Christophe; Gasquet, Dominique; Allemand, Pascal; Martineau, François; Martinez, Isabelle

    2017-03-01

    Four imbricated mafic to felsic plutons of Variscan age from Morocco have been investigated for their cooling history and geochemical interactions with surrounding continental rocks. Oxygen isotope compositions of whole rocks and minerals have been used to model the cooling rates of these kilometer-sized intrusions. By combining both the knowledge of oxygen-self diffusion data of rock-forming minerals and the determination by IR-spectroscopy of the water content of quartz, the cooling times are estimated ranging from 105 to 5 × 105 years in agreement with the shallow emplacement (4-6 km depth) of these intrusions into the continental crust. Such fast cooling rates could explain why after assimilation of the various country rocks, heterogeneities of both neodymium and strontium isotope ratios were still preserved. A progressive δ18O increase from the mafic to felsic terms of the plutonic suite, which does not excess 1 to 1.5‰, could be explained by the assimilation of metamorphosed pelitic and volcanic rocks that constitute the basement of the Tichka plutonic complex.

  14. Petrology of Terra Nova pluton, Brazil, and associated ultrapotassic dykes

    International Nuclear Information System (INIS)

    Silva Filho, A.F. da; Thompson, R.N.; Leat, P.T.

    1987-01-01

    The Upper Precambrian Terra Nova Pluton, situated 550 Km inland from Recife, Brazil, is 220 Km 2 in area and intrudes deformed metasedimentary rocks of the Pianco-Alto Brigida Mobile Belt. The Pluton shows complex petrological relationships. It consists of subalkaline quartz-monzonites and quartz-syenites, and the major minerals are K-feldspars, albite, hornblende, and quartz. The pluton is intermediate in composition (SiO 2 = 58.9-65.6 wt%, MgO=0.9-3.7 wt%) and is dominantly potassic (K 2 O=3.3-5.6 wt %; K 2 O/Na 2 O=0.9-1.8). Ba (up to 2.300 ppm) and Sr (up to 1,100 ppm) are abundant in the rocks, and LREE are enriched relative to HREE (La N /Lu N = 25.6-43.2). There is no significant Eu Anomaly. Rounded autoliths within the pluton are similar, but more mafic in composition (SiO 2 =54.6-57.5 wt %; MgO=4.9-6.4 wt %). A suite of dykes cut pluton and the surrounding country rocks. These dykes are varied in composition, encompassing most of the chemical range shown by the pluton and associated autoliths. The dykes are holocrystalline, peralkaline, and strongly enriched in both K 2 O(K 2 O=5.3-11.4 wt %) and Ba (Ba=2,400 ppm-10,500 ppm), which are considered to be magmatic abundances. The dykes have similar REE and other trace elements and ratios to the autoliths and plutonic rocks, and the dykes and the pluton are thought to be chemically related. The Terra Nova Pluton records the fractionation of mantle-derived ultrapotassic magma from mafic to intermediate compositions. (author) [pt

  15. From steep feeders to tabular plutons - Emplacement controls of syntectonic granitoid plutons in the Damara Belt, Namibia

    Science.gov (United States)

    Hall, Duncan; Kisters, Alexander

    2016-01-01

    Granitoid plutons in the deeply eroded south Central Zone of the Damara Belt in Namibia commonly show tabular geometries and pronounced stratigraphic controls on their emplacement. Subhorizontal, sheet-like pluton geometries record emplacement during regional subhorizontal shortening, but the intrusion of spatially and temporally closely-related granitoid plutons at different structural levels and in distinct structural settings suggests independent controls on their levels of emplacement. We describe and evaluate the controls on the loci of the dyke-to-sill transition that initiated the emplacement of three syntectonic (560-530 Ma) plutons in the basement-cover stratigraphy of the Erongo region. Intrusive relationships highlight the significance of (1) rigidity anisotropies associated with competent sedimentary packages or pre-existing subhorizontal granite sheets and (2) rheological anisotropies associated with the presence of thick ductile marble horizons. These mechanical anisotropies may lead to the initial deflection of steep feeder conduits as well as subsequent pluton assembly by the repeated underaccretion of later magma batches. The upward displacement of regional isotherms due to the heat advection associated with granite emplacement is likely to have a profound effect on the mechanical stratification of the upper crust and, consequently, on the level at which granitoid pluton emplacement is initiated. In this way, pluton emplacement at progressively shallower crustal depths may have resulted in the unusually high apparent geothermal gradients recorded in the upper crustal levels of the Damara Belt during its later evolution.

  16. Medio ambiente, mercado y Estado

    OpenAIRE

    Duque Escobar, Gonzalo

    2014-01-01

    La fuerza del mercado frente a las falencias del Estado, como factores que explican las barreras para el desarrollo de la vacuna sintética contra la malaria en Colombia y la falta de control a las causas antrópicas del ecosidio de los chigüiros en el desierto de muerte del Casanare

  17. Zinc bioleaching from an iron concentrate using Acidithiobacillus ferrooxidans strain from Hercules Mine of Coahuila, Mexico

    Science.gov (United States)

    Núñez-Ramírez, Diola Marina; Solís-Soto, Aquiles; López-Miranda, Javier; Pereyra-Alférez, Benito; Rutiaga-Quiñónes, Miriam; Medina-Torres, Luis; Medrano-Roldán, Hiram

    2011-10-01

    The iron concentrate from Hercules Mine of Coahuila, Mexico, which mainly contained pyrite and pyrrhotite, was treated by the bioleaching process using native strain Acidithiobacillus ferrooxidans ( A. ferrooxidans) to determine the ability of these bacteria on the leaching of zinc. The native bacteria were isolated from the iron concentrate of the mine. The bioleaching experiments were carried out in shake flasks to analyze the effects of pH values, pulp density, and the ferrous sulfate concentration on the bioleaching process. The results obtained by microbial kinetic analyses for the evaluation of some aspects of zinc leaching show that the native bacteria A. ferrooxidans, which is enriched with a 9K Silverman medium under the optimum conditions of pH 2.0, 20 g/L pulp density, and 40 g/L FeSO4, increases the zinc extraction considerably observed by monitoring during15 d, i.e., the zinc concentration has a decrease of about 95% in the iron concentrate.

  18. Laboratorio empresarial de las pymes: una experiencia en región lagunera de Coahuila

    Directory of Open Access Journals (Sweden)

    Víctor Manuel Molina Morejón

    2013-12-01

    Full Text Available Las pequeñas y medianas empresas –pymes– han sido en los últimos años el centro de atención de numerosos trabajos; no obstante, aún siguen necesitadas de fundamentos estratégicos, operativos y de alianzas que, de forma continua, les brinden oportunidades para mejorar su competitividad. Este Laboratorio Empresarial –LE– realiza estudios regionales dentro del Estado de Coahuila y facilita el auto-diagnóstico del modelo de negocio y la definición de estrategias de cambio, diseña estrategias cooperativas de innovación bajo un modelo de Triple Hélice, ofreciendo un sitio de conexión virtual entre la empresa y la universidad. Se presentan los resultados alcanzados en el diseño, validación y conformación del sistema de trabajo del Laboratorio Empresarial, así como los de indagación empírica con muestra significativa de empresarios en donde se puede apreciar el grado de similitud que existe entre la percepción que el empresario tiene del funcionamiento de su empresa y el modelo de negocios teórico que hemos diseñado y que sirve de referencia para la evaluación del funcionamiento de la PYME.

  19. Primer registro de la cotorra argentina (Myiopsitta monachus en Coahuila, México

    Directory of Open Access Journals (Sweden)

    Guillermo Romero-Figueroa

    2017-04-01

    Full Text Available Reportamos por primera vez individuos de la cotorra argentina (Myiopsitta monachus en una colonia reproductiva en la ciudad de Torreón, Coahuila, México. observadas por primera vez en febrero de 2013. Tras las observaciones de junio de 2016, se registró un aumento importante de la población, fue evidente que su distribución se extendió a nuevas áreas dentro del campus Laguna de la Universidad Autónoma Agraria Antonio Narro. La colonia estaba establecida sobre plantas de yuca (Yucca elata, con al menos ocho entradas visibles activas, a una altura de 4 m sobre el nivel del suelo. En 2013 observamos 12 individuos en el sitio; de los cuales nueve fueron adultos y tres jóvenes, mientras que en las observaciones del 2016 detectamos 25 cotorras. A pesar de que hay una estrategia nacional para prevenir, controlar y erradicar especies exóticas invasoras en México, en la ciudad de Torreón no existe ninguna acción que controle esta especie. El área urbana donde se encuentra establecida la población de cotorras posee características y condiciones apropiadas en estructura y composición de la vegetación, según la literatura, para que continúe el crecimiento de la población.

  20. La movilidad y la distribución del ingreso en los municipios de Coahuila

    Directory of Open Access Journals (Sweden)

    Luis Gutiérrez Flores

    2011-01-01

    Full Text Available En este artículo se analiza la dinámica en la distribución del ingreso de los municipios del estado de Coahuila, de 1970 a 2000. Para esto se utilizan herramientas de creciente aceptación, como alternativas para estudiar la dinámica en las desigualdades regionales: las cadenas de Markov y las funciones de densidad. En este caso, el análisis se desagrega hasta el municipio, con el objetivo de conocer cómo interactúan dichas unidades económicas entre sí, un contexto que tendría que enriquecer la literatura del tema, aún escasa en comparación con los trabajos que emplean metodologías predominantes, como la ecuación clásica de convergencia. Los resultados indican que en los municipios hay una inmovilidad relativa en términos de ingresos, es decir, que no hay cambios importantes en su distribución, la cual, a la vez, se encuentra polarizada.

  1. The Cuatro Ciénegas Basin in Coahuila, Mexico: An Astrobiological Precambrian Park

    Science.gov (United States)

    Siefert, Janet L.; Escalante, Ana E.; Elser, James J.; Eguiarte, Luis E.

    2012-01-01

    Abstract The Cuatro Ciénegas Basin (CCB) is a rare oasis in the Chihuahuan Desert in the state of Coahuila, Mexico. It has a biological endemism similar to that of the Galapagos Islands, and its spring-fed ecosystems have very low nutrient content (nitrogen or phosphorous) and are dominated by diverse microbialites. Thus, it has proven to be a distinctive opportunity for the field of astrobiology, as the CCB can be seen as a proxy for an earlier time in Earth's history, in particular the late Precambrian, the biological frontier when prokaryotic life yielded at least partial dominance to eukaryotes and multicellular life. It is a kind of ecological time machine that provides abundant opportunities for collaborative investigations by geochemists, geologists, ecologists, and population biologists in the study of the evolutionary processes that structured Earth-based life, especially in the microbial realm. The CCB is an object of investigation for the identification of biosignatures of past and present biota that can be used in our search for extraterrestrial life. In this review, we summarize CCB research efforts that began with microbial ecology and population biology projects and have since been expanded into broader efforts that involve biogeochemistry, comparative genomics, and assessments of biosignatures. We also propose that, in the future, the CCB is sanctioned as a “Precambrian Park” for astrobiology. Key Words: Microbial mats—Stromatolites—Early Earth—Extremophilic microorganisms—Microbial ecology. Astrobiology 12, 641–647. PMID:22920514

  2. Multiscale magmatic cyclicity, duration of pluton construction, and the paradoxical relationship between tectonism and plutonism in continental arcs

    Science.gov (United States)

    de Saint Blanquat, Michel; Horsman, Eric; Habert, Guillaume; Morgan, Sven; Vanderhaeghe, Olivier; Law, Richard; Tikoff, Basil

    2011-03-01

    The close relationship between crustal magmatism, an expression of heat dissipation, and tectonics, an expression of stress dissipation, leads to the question of their mutual relationships. Indeed, the low viscosity of magmas and the large viscosity contrast between magmas and surrounding rocks favor strain localization in magmas, and then possible "magmatic" initiation of structures at a wide range of scales. However, new data about 3-d pluton shape and duration of pluton construction perturb this simple geological image, and indicate some independence between magmatism and tectonics. In some cases we observe a direct genetic link and strong arguments for physical interactions between magmas and tectonics. In other cases, we observe an absence of these interactions and it is unclear how magma transfer and emplacement are related to lithospheric-plate dynamics. A simple explanation of this complexity follows directly from the pulsed, incremental assembly of plutons and its spatial and temporal characteristics. The size of each pluton is related to a magmatic pulsation at a particular time scale, and each of these coupled time/space scales is related to a specific process: in small plutons, we can observe the incremental process, the building block of plutons; in larger plutons, the incremental process is lost, and the pulsation, which consists of a cycle of injections at different timescales, must be related to the composition and thermal regime of the source region, itself driving magmatic processes (melting, segregation, and transfer) that interact with tectonic boundary conditions. The dynamics of pulsed magmatism observed in plutonic systems is then a proxy for deep lithospheric and magmatic processes. From our data and a review of published work, we find a positive corelation between volume and duration of pluton construction. The larger a pluton, the longer its construction time. Large/fast or small/slow plutons have not been identified to date. One

  3. Isotopic-geochemical investigation of Vitosh pluton (Bulgaria)

    International Nuclear Information System (INIS)

    Amelin, Yu.V.; Drubetskoj, E.R.; Monchev, N.B.; Nejmark, L.A.; Ovchinnikova, G.V.; Levskij, L.K.

    1989-01-01

    A set of isotope-geochronological (Rb-Sr, K-Ar, uranium fission tracks) and isotope-geochemical (Sr, Pb, Nd, He) methods was used to establish genesis and age of multi-phase Vitosh pluton. The investigation results have shown that primary magma from which pluton rocks were formed is generated at the level of high mantle - low crust. Insignificant difference in time of implantation and crystallization between variuos pluton phases is established. In the interval 84-79 millions of years the velocity of rock cooling and the velocity of pluton lift to the surface were estimated. In the interval 79-0 millions of years these velocities decrease essentially. After formation the rocks were not subjected to additional heat affects

  4. K/Ar age dating of Oshnaviyeh plutonic complex

    International Nuclear Information System (INIS)

    Ghalamghash, J.; Vosoughi Abedini, M.; Bellon, H.; Emami, M.H.; Pourmafi, M.; Rashid, H.

    2003-01-01

    Oshnaviyeh plutonic complex, the western member of Urumiyeh-Golpayehgan intrusive plutons is located in northern part of Sanandaj-Sirjan zon. Oshnaviyeh plutonic complex, exposing in an area of about 700 km 2 , comprises 10 plutons that can be divided into three suites, i.e.,diorite,granite,and alkali syenite-alkali granite. Dioritic bodies are the oldest intrusive rocks of the region, which on the basis of the field study, their relative age of emplacement is estimated to be post-Jurassic and pre-miocene. However, with respect to the age of other similar intrusive bodies in Naghadeh area, they are most likely of post early cretaceous-pre miocene age. Hybrid intrusive rocks, occurring at the contact of dioritic and granitic rocks may suggest a simultaneous emplacement of both magmas. Syntetic pluton from alkali syenite-alkali granite has intruded dioritic and granitic rocks, in contrast, flourine bearing alkali granite pluton from this suite shows no contact with other igneous rocks in the area. K-Ar age determinations obtained on amphibole specimens from diorite suite are 91.9±2.3, 94.1±2.3 and 100±2.4 Ma, and on biotite specimens from granite suite are 100±1.5 to 98.9±1.5 Ma. Chronology study using same method on arfvedsonite specimens from syenite pluton shows 78.9±3.1, 79.6±1.9 and 81.7±2.0 Ma and on K-fled par samples of flourine bearing alkali granite pluton from the alkali syenite-alkali granite suite presents 76±3.4 and 77.1±1.8. Therefore, based on field evidence and K/Ar age dating, Oshnaviyeh plutonic complex presumably formed during two episodes: granite and diorite suites formed simultaneously at about 100 Ma, then plutons of alkali syenite-alkali granite suite emplaced at about 80 Ma

  5. Hydrothermal convection and uranium deposits in abnormally radioactive plutons

    International Nuclear Information System (INIS)

    1978-09-01

    Hydrothermal uranium deposits are often closely associated with granites of abnormally high uranium content. We have studied the question whether the heat generated within such granites can cause fluid convection of sufficient magnitude to develop hydrothermal uranium deposits. Numerical models of flow through porous media were used to calculate temperatures and fluid flow in and around plutons similar to the Conway Granite, New Hampshire, i.e. with a halfwidth of 17 km, a thickness of 6.25 km, and with a uniform internal heat generation rate of 20 x 10 -13 cal/cm 3 -sec. Fluid convection was computed for plutons with permeabilities between 0.01 and 5 millidarcies (1 x10 -13 cm 2 to 5 x 10 -11 cm 2 . Flow rates and the size and location of convection cells in and around radioactive plutons like the Conway Granite were found to depend critically on the permeability distribution within the pluton and in adjacent country rocks. The depth of burial, the distribution of heat sources within the pluton, and small rates of heat generation in the country rock are only of minor importance. Topographic relief is unlikely to effect flow rates significantly, but can have a major influence on the distribution of recharge and discharge areas. Within a few million years, the mass of water transported by steady state convection through such radioactive plutons can equal the mass of water which can convect through them during initial cooling from magmatic temperatures. If the permeability in a Conway-type pluton is on the order of 0.5 millidarcies, the rate of fluid convection is probably sufficient to develop a hydrothermal ore deposit containing 10,000 tons of uranium in a period of two million years. Such a uranium deposit is most likely to develop in an area of strong upwelling or strong downwelling flow

  6. Pinus Culminicola Andresen y Beaman y sus asociaciones en la ladera sur del cerro La Viga, Coahuila

    Directory of Open Access Journals (Sweden)

    Rubén Sánchez Silva

    1990-01-01

    Full Text Available Pinus culminicola was described in 1961 with samples from the Cerro Potosí, State of Nuevo León, Mexico. The species was reported in the Sierras La Marta in 1962, and San Antonio de las Alazanas in 1975, State of Coahuila, indicating that there were not pure associations. In 1979 the species was colected in the Sierra La Viga, Coahuila, at 3 300 m, without data on environmental conditions in which it grows. The distribution of  P. culminicola is restricted to the south slope of the Cerro La Viga. The associations identified and described in this paper are: (1 Scrub of Quercus rugosa – Quercus durifolia – Cercocarpus montanus with elements of P. culminicola; (2 Pinus montezumae–Pseudotsuga macrolepisy with elements of P. culminicola, Quercus spp. and Arbutus xalapensis (3 P. culminicola– Quercus rugosa (both of them as shrubs; (4 P. montezumac–P. macrolepis–Pinus ayacahuite–P. culminicola; (5 pure scrub of P. culminicola; (6 P. culminicola– Dasylirion tezanum (sometimes with Arctostaphylos pungens and Quercus spp., shrublike; (7 Pinus hartwegii–P. culminicola; (8 P. hartwegii with elements of P. macrolepis and P. culminicola; and (9 induced prairie. There are differences in dominance of the species in accordance to the particular characteristics of each place, with presence of herbaceous from high altitudes. The altitude at which these associations occur, varies from 2 900 m to 3 700 m, although isolated elements of P. culminicola–were found at 2 700 m.

  7. Design and evaluation of a no-tillage seeder for small scale vegetable production using a two-wheeled tractor in Coahuila, Mexico

    NARCIS (Netherlands)

    Vries, de J.; Cadena Zapata, M.; Hoogmoed, W.B.

    2009-01-01

    Currently used conventional tillage systems for small-scale vegetable production in the region of Saltillo, Coahuila, Mexico require a considerable amount of hand labor, energy and materials for all activities. Seedbed preparation can require up to 60% of the total production cost in some systems in

  8. Hacer Mercado en una Lógica de Mercado. Las Dimensiones Culturales del Mercado en la Plaza de Mercado de Mesitas del Colegio.

    OpenAIRE

    Hurtado Suaréz, Christian Camilo

    2013-01-01

    Esta investigación desnaturaliza el mercado como concepto económico al abordarlo como fenómeno social. Para ello indagamos ¿Cuáles son las dimensiones culturales del mercado en la plaza de mercado de Mesitas del colegio?; dicha pregunta lleva implícita una postura: lo que entendemos como mercado, el concepto de la ciencia económica, ¿es susceptible de ser analizado en tanto fenómeno social y no solo como fenómeno económico? ¿Qué alcances explicativos tiene introducir otras d...

  9. Spatial and Temporal Variations of the Indidura Formation (Cenomanian-Turonian) in Northeastern Mexico, Coahuila State

    Science.gov (United States)

    Duque-Botero, F.; Maurrasse, F. J.

    2002-12-01

    Rock sequences of Cenomanian-Turonian age commonly assigned to the Indidura Formation in northeastern Mexico, Coahuila State, are shown to include distinct facies indicative of significant spatial variability over the carbonate platform of that region. The type section at Las Delicias is characterized by very-pale orange (10YR8/2) bedded biocalcirudites (10-30 cm thick), without internal structures, and comprises fossil assemblages rich in epifaunal groups, as well as nektonic and planktic taxa. Total inorganic carbon (TIC) varies between 48 % and 94 %, with fluctuation in total organic carbon (TOC) between 0.73 % and 1.58 %. The section at la Casita Canyon, farther southeast, consists of pale yellowish brown (10YR6/2) interbedded biocalcilutites and olive gray (5Y3/2) shales between 3 and 30 cm thick. They also show no apparent original internal structures, and allochems consist essentially of sparse fragments of planktonic foraminifera and radiolarian. TIC content varies between 0.84 % and 59.3 %, whereas TOC changes between 0.17 % and 5.85 %. In contrast, in the Parras Mountains, located south of La Delicias and northwest of la Casita, the succession occurs under a characteristic sequence showing interbeds of light olive gray (5Y6/1) and brownish black to olive black (5YR2/1 - 5Y2/1) shales and marly biocalcilutites 30 to 100 cm thick. They display distinct internal structures arranged in nearly even parallel varve-like dual lamina (TIC content varies from 43 % to 78.3 %, while TOC content remains relatively high with values between 7.35 % and 24.39 %, but more consistently higher than 20 %. Assuming that these facies are coeval, microfacies studies of these rocks as well as acid etched polished rocks, and scanning electron microscope examination (secondary and backscatter imaging) further substantiate these spatial differences. TOC-rich black shales in the Parras region further document unique paleoceanographic conditions, which was also characterized by

  10. Detección de infección por Coccidioides immitis en zonas del estado de Coahuila, México Detection of Coccidioides immitis infection in Coahuila, Mexico

    Directory of Open Access Journals (Sweden)

    R. Mondragón-González

    2005-09-01

    Full Text Available La coccidioidomicosis es una micosis inicialmente pulmonar causada por Coccidioides immitis; puede diseminarse principalmente a sistema nervioso central, huesos y piel. En México se desconoce la frecuencia exacta de esta enfermedad. Nuestro objetivo fue determinar, por intradermorreacción y por serología, los casos de infección por C. immitis en 12 comunidades (10 rurales y dos urbanas atendidas en el Hospital Rural Nº 79 del Instituto Mexicano del Seguro Social (IMSS del estado de Coahuila, México. Se estudiaron 668 individuos adultos de ambos sexos; se les aplicó 0,1 ml de coccidioidina por vía intradérmica; después de 72 hs. se midió el diámetro de induración. Fueron seleccionados 180 individuos y a partir del suero se determinaron los niveles de inmunoglobulinas anti-C. immitis por ELISA. Fueron positivos a la coccidioidina 621 sujetos (93%, frecuencia mucho mayor a la reportada previamente en Coahuila. De los 180 sueros estudiados los promedios de densidad óptica (DO fueron: IgG1, 1,55; IgG2, 0,94; IgG total, 0,33; IgG3, 0,29; IgG4, 0,27; IgM, 0,08. Los valores de IgG1, IgG2 e IgM comparados con las otras inmunoglobulinas fueron estadísticamente significativos. Los valores de IgG1 e IgG2 sugieren contacto frecuente con los antígenos e incluso probables casos de enfermedad no diagnosticada.Coccidioidomycosis is a mycosis firstly pulmonar caused by Coccidioides immitis; it can be disseminated to central nervous system, bones and skin, principaly. In Mexico, the real frequency of the disease is unknown. The aim of this work was to determine, by skin test and by serology, the infection cases by C. immitis in twelve communities (10 rural and two urban, attended in the Hospital Rural Nº 79 at the Instituto Mexicano del Seguro Social (IMSS from the Coahuila State, Mexico. Six hundred and sixty eight adult individuals of both sexes were studied, to whom 0.1 ml of coccidioidin by intradermal route was applied; 72 h after, the

  11. Sistema regional de Coahuila: un análisis basado en la innovación y sus interacciones en las MIPYME en la región lagunera de Coahuila, México

    Directory of Open Access Journals (Sweden)

    María del Carmen Armenteros Acosta

    2013-07-01

    Full Text Available La innovación como proceso complejo y multidimensional evidencia la necesidad de su interpretación desde las interacciones, lo cual no se refleja en los estudios realizados mediante las encuestas nacionales de innovación, ni existe desagregación de datos a nivel regional. Por ello, el objetivo de este estudio es describir características del proceso interactivo de innovación en el Sistema Regional de Coahuila. La metodología contempla el estudio empírico basado en la encuesta de FAEDPYME sobre el desarrollo estratégico de las MIPYME del 2012 y encuesta (adaptada sobre de colaboración y cooperación en proyectos de desarrollo tecnológico del IAIF/FECYT de España. La muestra abarca 54 MIPYME innovadoras de los sectores comercio, industria y servicios, en las ciudades de la región Lagunera de Coahuila, mediante entrevistas estructuradas a directivos. Los resultados muestran que el proceso de innovación tiene lento dinamismo, carácter esporádico y no sistémico; la colaboración fundamental con la universidad está en la formación especializada de sus recursos humanos; en las empresas que tienen formalizadas o realizan actividades de I+D+I, se da colaboración en torno a los proyectos de investigación e innovación con universidades o con gobierno en busca de apoyo financiero. En la colaboración y la cooperación en proyectos concertados en torno a la complementariedad científica y tecnológica el efecto no es evidente.

  12. Sistema regional de Coahuila: un análisis basado en la innovación y sus interacciones en las MIPYME en la región lagunera de Coahuila, México

    Directory of Open Access Journals (Sweden)

    María del Carmen Armenteros Acosta

    2013-06-01

    Full Text Available La innovación como proceso complejo y multidimensional evidencia la necesidad de su interpretación desde las interacciones, lo cual no se refleja en los estudios realizados mediante las encuestas nacionales de innovación, ni existe desagregación de datos a nivel regional. Por ello, el objetivo de este estudio es describir características del proceso interactivo de innovación en el Sistema Regional de Coahuila. La metodología contempla el estudio empírico basado en la encuesta de FAEDPYME sobre el desarrollo estratégico de las MIPYME del 2012 y encuesta (adaptada sobre de colaboración y cooperación en proyectos de desarrollo tecnológico del IAIF/FECYT de España. La muestra abarca 54 MIPYME innovadoras de los sectores comercio, industria y servicios, en las ciudades de la región Lagunera de Coahuila, mediante entrevistas estructuradas a directivos. Los resultados muestran que el proceso de innovación tiene lento dinamismo, carácter esporádico y no sistémico; la colaboración fundamental con la universidad está en la formación especializada de sus recursos humanos; en las empresas que tienen formalizadas o realizan actividades de I+D+I, se da colaboración en torno a los proyectos de investigación e innovación con universidades o con gobierno en busca de apoyo financiero. En la colaboración y la cooperación en proyectos concertados en torno a la complementariedad científica y tecnológica el efecto no es evidente.

  13. Mercado de Video en Brasil

    Directory of Open Access Journals (Sweden)

    Luis Santero

    2015-01-01

    Full Text Available La autora relata la historia de las Relaciones Públicas y dice que surgieron y se desarrollaron para legitimar ante el público los intereses económicos y políticos de quienes detentan el poder. Se cuestiona sobre el por qué no aplicar las relaciones públicas, en organizaciones populares, para que mejoren su publicación y orienten sus propósitos de desarrollo. El tema que aborda las Políticas culturales en América Latina acopia un extracto de lo más trascendente de los ensayos del libro editado por Néstor García Canclini. Sobre la telenovela se afirma que esta ha llegado a ser uno de los instrumentos más importantes de la comunicación popular: por ella desfilan las identidades de las más variadas culturas brasileñas. Y en cuanto a la caricatura se relata lo que ocurrió en el Seminario taller " Caricatura y Periodismo", realizado el(9-11 de Nov.- 1987 en el CIESPAL. El estudio sobre el mercado del vídeo se ve dificultado por la imprecisión de los datos obtenidos. Los datos oficiales no siempre se aproximan a la realidad, pues el mercado de vídeo se instauró en América Latina partiendo de una lógica totalmente diversa de los equipos de sonido e imagen.

  14. Condiciones del consumo e ingreso por el trabajo en Piedras Negras, Coahuila

    Directory of Open Access Journals (Sweden)

    Blanca Delia Vázquez Delgado

    2002-01-01

    Full Text Available En este trabajo se asume que los patrones de consumo son resultado, principalmente, de la estructura socioeconómica y por ello identifican ciertas condiciones del bienestar alcanzado por la población. La existencia de mercados de consumo transfronterizos, bajo condiciones de diferenciación e integración, permiten a la población asentada a lo largo de la frontera entre México y Estados Unidos discriminar entre bienes y servicios que le proporcionan diferentes escalas de calidad y satisfacción de necesidades. Esta circunstancia, sin embargo, evidencia con mayor magnitud las diferencias en los estándares de bienestar en poblaciones de carácter no sólo heterogéneo y de desigual distribución del ingreso, sino también un desigual acceso a mercados de consumo, colocando, en los espacios transfronterizos, a los usos y valores sociales del acto de compra por encima de las desigualdades propias de la distribución del ingreso.

  15. Estimación de la biomasa foliar seca de Lippia graveolens Kunth del sureste de Coahuila

    Directory of Open Access Journals (Sweden)

    Eulalia Edith Villavicencio Gutiérrez

    2018-01-01

    Full Text Available El orégano es un recurso forestal no maderable de importancia comercial, considerado como una especie aromática y culinaria que se aprovecha en las zonas semiáridas de Coahuila, con una producción mayor a 700 t anuales, y representa para el sector rural una opción productiva. Con el propósito de cuantificar el recurso y contribuir a regular su aprovechamiento, se determinaron las relaciones alométricas de individuos de orégano recolectados en 20 poblaciones naturales distribuidas en los municipios General Cepeda, Parras de la Fuente y Ramos Arizpe, Coahuila, para seleccionar un modelo que estime la biomasa foliar seca (Bfs de la planta. A partir de un muestreo destructivo, se analizaron 706 plantas, de las cuales se obtuvo su altura total (At, diámetro mayor arbustivo (DM y diámetro menor arbustivo (Dm, diámetro promedio (Dp de la copa y biomasa foliar seca (Bfs. Con la prueba de correlación de Pearson se eligieron las variables más relacionadas con la Bfs , las cuales se emplearon para ajustar 10 modelos de regresión mediante el procedimiento PROC MODEL. El modelo seleccionado fue el de Schumacher-Hall Bfs 0.00599(Dp1.935454(At0.256803por registrar valores superiores de R2aju (0.80 y el menor valor en la raíz del cuadrado medio del error (RCME, 0.304, considerando la significancia de sus parámetros (p≤ 0.0001, a partir de este se elaboró una tabla de doble entrada que estima la Bfs de las plantas.

  16. ControlFluid: un mercado variable

    OpenAIRE

    Villa Duran, Nicolas

    2014-01-01

    Las estrategias de una empresa en un mercado pequeño donde hay pocos compradores y muchos vendedores se vuelven el centro y punto clave de éxito, de lo contrario la empresa solo sigue una tendencia de mercado que al mediano plazo no resultara efectiva y terminan desapareciendo. Es por ello que las estrategias de mercado en las empresas se vuelven la característica diferenciadora permitiendo tomar ventaja del hacinamiento de un sector. Para que una empresa sea exitosa debe tener en cuenta sus ...

  17. Crimes contra o mercado de capitais

    OpenAIRE

    Leonardo Alonso

    2009-01-01

    A necessidade de tutela eficiente do Mercado de Capitais é, atualmente, indiscutível. O advento de novas tecnologias e o tráfego internacional de capital cada vez maior; tornam o Mercado de Capitais, contemporaneamente, sujeito a amplos riscos e danos. Nesse contexto, o legislador tem respondido com a incriminação de condutas ofensivas ao mercado, contudo a formulação de tipos penais nem sempre se mostra adequada. Dessa forma, questiona-se qual o bem juridicamente tutelado pelos crimes contra...

  18. Isotopic character of Cambro-Ordovician plutonism, southern Victoria Land

    International Nuclear Information System (INIS)

    Cox, S.C.; Parkinson, D.L.; Allibone, A.H.; Cooper, A.F.

    2000-01-01

    Previous mapping of granitoid rocks in the Dry Valleys area of southern Victoria Land, Antarctica, identified the calc-alkaline (DV1a), adakitic (DV1b), and monzonitic (DV2) suites. A fourth older suite comprising alkaline gabbro, syenite, and A-type granite occurs in the Mt Dromedary area c. 80 km to the south. U-Pb zircon dating of Bonney Pluton, the largest calc-alkaline DV1a intrusion, indicates emplacement of this regional-scale body at 505 +/- 2 Ma. Pb-loss and inherited zircon were common to Bonney Pluton analyses of this study. U-Pb dating of monazite from Valhalla Pluton, a principal DV1b suite adakitic intrusion, indicates emplacement at 488 +/- 2 Ma. The Bonney Pluton age constrains the peak of calc-alkaline plutonism at 505 Ma and the Valhalla Pluton age records the major pulse of adakitic plutonism that is inferred to mark the final stages of subduction c. 490 Ma along this section of the East Antarctic margin. Nd and Sr isotope data for the calc-alkaline DV1a suite and adakitic DV1b suite define distinct ranges for each suite, supporting their subdivision on the basis of field relationships, petrography, and whole-rock geochemistry. Calc-alkaline DV1a suite granite magmas have eNd(T) = -4.2 to -6.1 and Sri = 0.7071-0.7079, whereas the adakitic DV1b suite rocks have a wider range of eNd(T) = -1.9 to -7.2 and Sri = 0.7065-0.7097. The isotopic data suggest a significant mantle component and subordinate crustal component in the source region of both suites. Time-dependent variations in the isotopic ratios of DV1a and DV1b suites imply a progressive increase in the proportion of more radiogenic material in the source region of the granitoid rocks, either mantle- or crust-derived material. Larger adakitic DV1b plutons are more 'evolved' than equivalent, smaller plutons of the same DV1b suite. Vanda Dikes and monzonitic DV2 suite intrusions are characterised by particularly low Sri = 0.7044-0.7067 and near-constant eNd(T) = -4.8 to -5.3, which indicate a

  19. Miscellaneous investigations series: Bedrock geologic map of the Lone Mountain pluton area, Esmeralda County, Nevada

    International Nuclear Information System (INIS)

    Maldonado, F.

    1984-01-01

    The joint attitudes were measured in the field and plotted on aerial photos at a scale of 1:24,000. The pluton is intensely jointed, primarily as a result of cooling and movement of the magma within a northwest-trending stress field. Foliation, in general, is poorly developed, and quality varies from area to area, but it is best developed close to the contacts with the metasedimentary rocks. A prominent northwest foliation direction was observed that parallels the northwest elongation of the exposed pluton. Faults in the pluton are difficult to identify because of the homogeneity of the rock. Several faults were mapped in the northern part of the area where they have a northeast trend and intersect the northwest-trending lamprophyre dikes with little apparent displacement. A major fault that bounds the northern part of the pluton is downthrown to the north and strikes northeast. This fault offsets the alluvium, the metasedimentary rocks, and the pluton and forms fault scraps as high as 10 m. Aeromagnetic data (US Geological Survey, 1979) suggest the following: (1) the local magnetic highs in the central part of the Lone Mountain pluton are probably related to topographic highs (peaks) where the flight lines are closer to the pluton; (2) a magnetic low in the northeastern part of Lone Mountain coincides with the pluton-country rock contact, which may be very steep; (3) the contours for the southwestern part of the mapped area indicate that the pluton-country rock contact is not as steep as that in the northeastern part and that the pluton probably coalesces at depth with the Weepah pluton, a pluton exposed south of the mapped area; and (4) the contours for the area of the Lone Mountain pluton express a northwest-trending gradient that parallels the northwest elongation of the Lone Mountain pluton and the northwest-trending stress field. 10 refs

  20. Magma flow recorded by magmatic and magnetic fabrics in a shallow granitic pluton: La Gloria Pluton, central Chile

    Science.gov (United States)

    Payacán, I. J.; Gutiérrez, F. J.; Gelman, S. E.; Bachmann, O.; Parada, M. A.

    2013-12-01

    To better understand the dynamics of a small, shallow, silicic magma reservoir, magmatic and magnetic (AMS) fabrics are compared in samples obtained from La Gloria Pluton (LGP), a 10 Ma granitic intrusion located in southern Andes. The magnetic fabric of LGP, mainly given by magnetite, is characterized by oblate shapes. Magnetic lineations have a NW trend with subhorizontal dip, following the main pluton elongation, while magnetic foliation planes have dips varying gradually from vertical at the walls to subhorizontal toward the center and the roof of the pluton. On the basis of numerical simulations, magnetic fabric was interpreted to represent the shear record induced by magmatic convection along solidification fronts as the reservoir reached its rheological locking point. Magmatic fabric (mineral orientation) was determined on 12 samples along the pluton. Three mutually orthogonal thin sections were produced for each sample, perpendicular to the AMS tensor axes. Size and orientation of individual crystals were obtained by image analysis. A 2-D tensor for two mineral groups (plagioclase and amphibole+biotitie) was defined in each mineral plane projecting the crystal lengths on the main crystal orientation (given by Bingham statistics). A 3-D magmatic fabric tensor was obtained. In order to compare the magmatic and magnetic fabrics, magmatic anisotropy parameters were defined similar to the AMS tensors. Magmatic fabric and anisotropy parameter values vary depending on the location inside the pluton: (1) Samples located at the borders exhibit vertical foliations and lineations with a NW trend, similar to the magnetic fabric tensors and higher anisotropy values for plagioclase than amphibole+biotite,; (2) samples located at the center of the LGP commonly present subvertical foliations/lineations, which differ from the magnetic fabric, and higher magmatic anisotropy degree values for amphibole+biotite than plagioclase. Based on numerical simulations of the fluid

  1. Magmatic tempo of Earth's youngest exposed plutons as revealed by detrital zircon U-Pb geochronology.

    Science.gov (United States)

    Ito, Hisatoshi; Spencer, Christopher J; Danišík, Martin; Hoiland, Carl W

    2017-09-29

    Plutons are formed by protracted crystallization of magma bodies several kilometers deep within the crust. The temporal frequency (i.e. episodicity or 'tempo') of pluton formation is often poorly constrained as timescales of pluton formation are largely variable and may be difficult to resolve by traditional dating methods. The Hida Mountain Range of central Japan hosts the youngest exposed plutons on Earth and provides a unique opportunity to assess the temporal and spatial characteristics of pluton emplacement at high temporal resolution. Here we apply U-Pb geochronology to zircon from the Quaternary Kurobegawa Granite and Takidani Granodiorite in the Hida Mountain Range, and from modern river sediments whose fluvial catchments include these plutons in order to reconstruct their formation. The U-Pb data demonstrate that the Kurobegawa pluton experienced two magmatic pulses at ~2.3 Ma and ~0.9 Ma; whereas, to the south, the Takidani pluton experienced only one magmatic pulse at ~1.6 Ma. These data imply that each of these magmatic systems were both spatially and temporally distinct. The apparent ~0.7 Myr age gap between each of the three magmatic pulses potentially constrains the recharge duration of a single pluton within a larger arc plutonic complex.

  2. Granitoids of the Dry Valleys area, southern Victoria Land, Antarctica : plutons, field relationships, and isotopic dating

    International Nuclear Information System (INIS)

    Allibone, A.H.; Cox, S.C.; Johnstone, R.D.

    1993-01-01

    Detailed mapping throughout much of the Dry Valleys area indicates the region is underlain by 15 major granitoid plutons and numerous smaller plugs and dikes. Intrusive relationships of these plutons and dikes indicate repeated intrusion of superficially similar granitoids at different times. Sufficient internal lithologic variation occurs within individual plutons, to allow correlation with several of the previously defined granitoid units based on lithologic character. Consequently, previous subdivision schemes based on lithology are no longer tenable and are here replaced with a subdivision scheme based on the identification of individual plutons. The elongate, concordant Bonney, Denton, Cavendish, and Wheeler Plutons, which range in composition between monzodiorite and granodiorite, are the oldest relatively undeformed plutons in the Dry Valleys area. Each pluton is characterised by flow alignment of K-feldspar megacrysts, hornblende, biotite, and mafic enclaves. Field relationships and radiometric dating indicate these are deep-level plutons, emplaced synchronous with upper amphibolite facies metamorphism of the adjacent Koettlitz Group between 589 and 490 Ma ago. Elongate, discordant plutons of equigranular homogeneous biotite granodiorite and granite (Hedley, Valhalla, St Johns, Suess) were subsequently emplaced by stoping at a relatively high crustal level at 490 Ma. These eight plutons are cut by numerous swarms of Vanda mafic and felsic porphyry dikes. The ovoid, discordant, high level Pearse, Nibelungen, Orestes, Brownworth, Swinford, and Harker Plutons, emplaced between c. 486 and 477 Ma, display mutually crosscutting relationships with the youngest of the Vanda dikes. These younger plutons range in composition between monzonite and granite. Some are characterised by K-feldspar megacrystic textures superficially similar to some of the oldest concordant plutons. (author). 57 refs.; 2 tabs.; 4 figs

  3. Ciclos de actividad diaria y estacional de un gremio de saurios en las dunas de arena de Viesca, Coahuila, México Daily and seasonal activity patterns of a lizard guild in the sand dunes of Viesca, Coahuila, Mexico

    Directory of Open Access Journals (Sweden)

    Cristina García-De la Peña

    2007-06-01

    Full Text Available En el 2002 se evaluaron los ciclos de actividad diaria y estacional de los saurios Uta stejnegeri, Uma exsul y Aspidoscelis marmorata en un hábitat de dunas al suroeste de Coahuila, México. Se recorrió un transecto de 500 m, cada hora (de 0700 a 1900 h durante 7 días, en primavera, verano y otoño. Se registró el número de individuos activos por especie, la temperatura del aire y del sustrato, y la humedad relativa. La amplitud de nicho temporal se calculó mediante el Índice estandarizado de Levins, y el traslape de nicho mediante el método de Pianka. En las 3 estaciones del año U. stejnegeri inició su actividad más temprano que U. exsul, y ésta, a su vez, se registró antes que A. marmorata. Las 3 especies presentaron un ciclo de actividad bimodal durante primavera y verano, y unimodal en otoño. Aspidoscelis marmorata presentó la menor amplitud de nicho temporal durante las 3 estaciones. La temperatura corporal de cada especie y la temperatura ambiental parecen determinar los patrones de actividad de este gremio de saurios en Viesca.In 2002, daily and seasonal activity patterns of the lizards Uta stejnegeri, Uma exsul, and Aspidoscelis marmorata were evaluated in a dune habitat in the southwestern portion of Coahuila, Mexico. Methods included surveying a 500 m transect once per hour between 0700 and 1900 for 7 days each season during the spring, summer and fall. The number of active lizards, air and substrate temperatures, and relative humidity were recorded. A standardized Levins Index and Pianka’s method were used to measure temporal niche breadth and overlap, respectively. In each of the 3 seasons, U. stejnegeri was active earlier than U. exsul, and U. exsul was active before A. marmorata. The 3 species showed a bimodal activity pattern during spring and summer, and unimodal in fall. Aspidoscelis marmorata showed the smallest niche breadth in the 3 seasons. For each species, preferred body temperature and environmental

  4. Nuevo Mercado Nacional de Ganado

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    Sánchez de Dios, Alejandro

    1995-08-01

    Full Text Available The new National Livestock Market of Santiago de Compostela is the result of the need to move the present obsolete and badly located buildings to a new place which will have better access roads, better parking and circulation space for vehicles and more modem and complete installations. The complex is also meant to be a general purpose fairground. The article briefly describes the most important elements of the new installation, including the main 17,000 m2 building, with a laminated wood structure of a 53 m span, and the computer equipment which is one of the most complete ones in Europe in this type of installations.

    El nuevo Mercado Nacional de Ganado de Santiago de Compostela nace como consecuencia de la necesidad de trasladar las actuales edificaciones, obsoletas y mal ubicadas, a un nuevo recinto, que estará dotado de mejores accesos, mayor espacio para estacionamiento y circulación de vehículos y más modernas y completas instalaciones. Se pretende además que sirva como recinto ferial de carácter general. A lo largo del artículo se aborda una descripción somera de los elementos más significativos de la nueva instalación, desde la edificación principal, de 17.000 m2, con estructura de madera laminada de 53 m de luz, hasta el equipamiento informático, uno de los más completos de Europa en este tipo de instalaciones.

  5. Reconnaissance study of the Taylor Mountains pluton, southwestern Alaska

    Science.gov (United States)

    Hudson, Travis L.; Miller, Marti L.; Klimasauskas, Edward P.; Layer, Paul W.

    2010-01-01

    The Taylor Mountains pluton is a Late Cretaceous to early Tertiary (median age 65 + or ? 2 Ma) epizonal, composite biotite granite stock located about 235 km (145 mi) northeast of Dillingham in southwestern Alaska. This 30 km2 (12 mi2) pluton has sharp and discordant contacts with hornfels that developed in Upper Cretaceous clastic sedimentary rocks of the Kuskokwim Group. The three intrusive phases in the Taylor Mountains pluton, in order of emplacement, are (1) porphyritic granite containing large K-feldspar phenocrysts in a coarse-grained groundmass, (2) porphyritic granite containing large K-feldspar and smaller, but still coarse, plagioclase, quartz, and biotite phenocrysts in a fine-grained groundmass, and (3) fine-grained, leucocratic, equigranular granite. The porphyritic granites have different emplacement histories, but similar compositions; averages are 69.43 percent SiO2, 1.62 percent CaO, 5.23 percent FeO+MgO, 3.11 percent Na2O, and 4.50 percent K2O. The fine-grained, equigranular granite is distinctly felsic compared to porphyritic granite; it averages 75.3 percent SiO2, 0.49 percent CaO, 1.52 percent FeO+MgO, 3.31 percent Na2O, and 4.87 percent K2O. Many trace elements including Ni, Cr, Sc, V, Ba, Sr, Zr, Y, Nb, La, Ce, Th, and Nd are strongly depleted in fine-grained equigranular granite. Trace elements are not highly enriched in any of the granites. Known hydrothermal alteration is limited to one tourmaline-quartz replacement zone in porphyritic granite. Mineral deposits in the Taylor Mountains area are primarily placer gold (plus wolframite, cassiterite, and cinnabar); sources for these likely include scattered veins in hornfels peripheral to the Taylor Mountain pluton. The granite magmas that formed the Taylor Mountains pluton are thought to represent melted continental crust that possibly formed in response to high heat flow in the waning stage of Late Cretaceous subduction beneath interior Alaska.

  6. Dos mercados en México

    Directory of Open Access Journals (Sweden)

    Ramírez Vázquez, Pedro

    1966-06-01

    Full Text Available Markets at la Lagunilla in Mexico City (San Camilito Four buildings have been erected at Ciudad de Mexico, San Camilito, to serve as zonal food market, furniture and home goods market, prepared foods market and clothes market. Between the four of them, they occupy a total surface of 33,300 m2 and a volume of 165,000 m3. The most interesting feature of these buildings is the type of roof with which each has been fitted. Popular market, at Coyoacan The various zones of this market, namely, selling hall, children's nursery, and general services, indicate clearly, both because of their shape and size, their specific function. The selling zone is outstanding because of the roof, formed by a number of hyperbolic paraboloids, made with lightweight concrete.Mercado de La Lagunilla en la Ciudad de México, San Camilito Han sido construidos en la ciudad de México, San Camilito, cuatro edificios destinados, respectivamente, a mercado— de Zona—de alimentos, mercado de muebles y artículos para el hogar, mercado de alimentos preparados, y mercado de ropas y telas. Ocupan entre todos ellos una superficie total de 33.200 m2 y un volumen de ies.165.000 m3. Lo más interesante de cada uno de estos edificios es el tipo de cubierta adoptado en cada caso. Mercado popular, en Coyoacán Las distintas zonas que componen este mercado, es decir, sala de ventas, guardería, servicios generales, etc., acusan, tanto en planta como en volumen, las funciones que tienen lugar en las mismas. En la sala de ventas destaca la estructura de su cubierta, constituida por una serie de paraboloides hiperbólicos construidos a base de hormigón ligero.

  7. en el mercado de Estados Unidos

    Directory of Open Access Journals (Sweden)

    Nadima Simón Domínguez

    2004-01-01

    Full Text Available El objetivo de este artículo es analizar el comportamiento de las exportaciones del sector de prendas de vestir (de tejido de punto y de tejido plano en el mercado de Estados Unidos (EUA durante el periodo de 1990 a 2002. Se identifican los principales competidores, las características de ambos mercados y los instrumentos de política comercial utilizados por las empresas estadounidenses para la protección de su industria textil. De igual forma, se hace un análisis de los principales productos de prendas de vestir que nuestro país exportó a EUA clasificándolos por su participación en el mercado de dicho país y por el dinamismo que presentan éstos. También se identifican los factores que inciden en la participación de México en el mercado estadounidense. Se concluye que México incrementó considerablemente sus exportaciones de prendas de vestir a EUA después de la entrada en vigor del TLCAN y de la devaluación del peso mexicano de diciembre de 1994. México es líder en el mercado de aquel país en camisas de algodón y en pantalones de mezclilla, seguido muy de cerca por China. Para mantener la participación de las prendas de vestir de México en dicho mercado, nuestra industria del vestido debe orientarse a la fabricación de paquete completo y de productos de moda con mayor valor agregado.

  8. Soberania Alimentar, agroecologia e mercados locais.

    OpenAIRE

    Meirelles, Laércio

    2004-01-01

    A Rede Ecovida tem estimulado a construção de uma Rede Solidária de Produção e Circulação de Produtos Ecológicos nos estados do Paraná, de Santa Catarina e do Rio Grande do Sul, cujas células de comercialização são feiras livres, cooperativas de consumidores, mercados institucionais, pontos de abastecimento popular, pequenas lojas e comerciantes. Essa iniciativa é mais uma demonstração que práticas agroecológicas, associadas a mercados locais, trazem impactos positivos à Soberania Alimentar d...

  9. Ciudad Mercado, infraestructura en red. Madrid.

    OpenAIRE

    Carruthers, Luz María

    2016-01-01

    Los mercados de abastos de Madrid atraviesan uno profunda crisis que conlleva su decadencia arquitectónica. Si bien han sido una pieza el clave en la construcción social y urbana de Madrid. no son considerados una infraestructura, lo cual repercute en el tipo y calidad de intervenciones a los que se los somete. Recuperar su condición infraestructura, supone pensar en los mercados como red, enfocándose en las interacciones que plantean con el entorno a múltiples escalas. Éstas, pueden deber...

  10. Realidad de la prueba de mercado

    Directory of Open Access Journals (Sweden)

    Michel Berger

    1987-04-01

    Full Text Available RESUMEN El artículo presenta una visión esquemática de la controvertida  y olvidada Prueba de Mercado. Esta herramienta  presenta la particularidad de cumplir a la vez funciones de planeación y de control en el proceso de innovación de productos y estrategias de comercialización. Se trata entonces de mostrar que la Prueba de Mercado es una actividad menos compleja de lo que se presume y de acuerdo con la realidad colombiana es muy difícil sustituir.

  11. Flexibilidade e mercado de trabalho em Portugal

    OpenAIRE

    Centeno, Mário; Novo, Álvaro

    2008-01-01

    A era de rápida evolução tecnológica em que vivemos, associada em particular ao desenvolvimento de tecnologias de informação, coloca às economias novos desafios, mas também novas oportunidades, abrindo à concorrência mercados anteriormente fechados. Neste ambiente mais competitivo, não é estranho que o apelo a uma maior flexibilidade do emprego tenha ganho proeminência na discussão político-económica da organização do mercado de trabalho.

  12. GEOCHEMICAL CHARACTERISTICS OF TIANMENSHAN COMPOSITE PLUTON, SOUTH CHINA

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    Yanjiao Chen

    2017-01-01

    Full Text Available The southern Jiangxi province is located at east Nanling range, which is an important W-Sn metallogenic province of China. The Early Yanshanian Tianmenshan is composed of the main-phase porphyritic biotite granite and the highly differentiated fine-gained biotite granite, intruding in the Lower Cambrian Niujiaohe Formation. The main-phase granite and the late-stage highly differentiated granite emplaced at 152–158 Ma and 152–151 Ma, respectively. The later was in the center of the pluton as a ovalize shape, with a transitional contact with the main-phase granite.

  13. Guidelines to classification and nomenclature of Arabian felsic plutonic rocks

    Science.gov (United States)

    Ramsay, C.R.; Stoeser, D.B.; Drysdall, A.R.

    1986-01-01

    Well-defined procedures for classifying the felsic plutonic rocks of the Arabian Shield on the basis of petrographic, chemical and lithostratigraphic criteria and mineral-resource potential have been adopted and developed in the Saudi Arabian Deputy Ministry for Mineral Resources over the past decade. A number of problems with conventional classification schemes have been identified and resolved; others, notably those arising from difficulties in identifying precise mineral compositions, continue to present difficulties. The petrographic nomenclature used is essentially that recommended by the International Union of Geological Sciences. Problems that have arisen include the definition of: (1) rocks with sodic, zoned or perthitic feldspar, (2) trondhjemites, and (3) alkali granites. Chemical classification has been largely based on relative molar amounts of alumina, lime and alkalis, and the use of conventional variation diagrams, but pilot studies utilizing univariate and multivariate statistical techniques have been made. The classification used in Saudi Arabia for stratigraphic purposes is a hierarchy of formation-rank units, suites and super-suites as defined in the Saudi Arabian stratigraphic code. For genetic and petrological studies, a grouping as 'associations' of similar and genetically related lithologies is commonly used. In order to indicate mineral-resource potential, the felsic plutons are classed as common, precursor, specialized or mineralized, in order of increasing exploration significance. ?? 1986.

  14. The Solarya Volcano-Plutonic Complex (NW Turkey): Petrography, Petrogenesis and Tectonic Implications

    Science.gov (United States)

    Ünal, Alp; Kamacı, Ömer; Altunkaynak, Şafak

    2014-05-01

    The post collisional magmatic activity produced several volcano-plutonic complexes in NW Anatolia (Turkey) during the late Oligocene- Middle Miocene. One of the major volcano-plutonic complexes, the Solarya volcano-plutonic complex is remarkable for its coeval and cogenetic plutonic (Solarya pluton), hypabysal and volcanic rocks of Early Miocene (24-21 Ma) age. Solarya pluton is an epizonal pluton which discordantly intruded into metamorphic and nonmetamorphic basement rocks of Triassic age. It is a N-S trending magmatic body covering an area of 220 km2,approximatelly 20 km in length and 10 km in width. Based on the field and petrographic studies, three main rock groups distinguished in Solarya pluton; K-feldspar megacrystalline granodiorite, microgranite-granodiorite and haplogranite. Porphyritic and graphic-granophyric textures are common in these three rock groups. Pluton contains magmatic enclaves and syn-plutonic dykes of dioritic composition. Hypabyssal rocks are represented by porphyritic microdiorite and porphyritic quartz-diorite. They form porphyry plugs, sheet inrusions and dykes around the pluton. Porphyrites have microcrystalline-cryptocrystalline groundmass displaying micrographic and granophyric textures. Petrographically similar to the hypabyssal rocks, volcanic rocks are formed from andesitic and dasitic lavas and pyroclastic rocks. Plutonic, hypabyssal and volcanic rocks of Solarya volcano-plutonic complex show similar major-trace element and Sr-Nd-Pb isotopic compositions, indicating common magmatic evolution and multicomponent melt sources including mantle and crustal components. They are mainly metaluminous, medium to high-K calc alkaline rocks and display enrichment in LILE and depletion in Nb, Ta, P and Ti. They have initial 87Sr/86Sr values of 0.70701- 0.70818 and 143Nd/144Nd values of 0.51241-0.51250. These geochemical characteristics and isotopic signatures are considered to reflect the composition of the magmas derived from a

  15. Plutons and accretionary episodes of the Klamath Mountains, California and Oregon

    Science.gov (United States)

    Irwin, William P.; Wooden, Joseph L.

    1999-01-01

    The Klamath Mountains consist of various accreted terranes and include many plutons that range in composition from gabbro to granodiorite. Some of the plutons (preaccretionary plutons) were parts of terranes before the terranes accreted; others (accretionary plutons) intruded during or after the accretion of their host terrane(s). This report attempts to (1) graphically illustrate how the Klamath Mountains grew by the accretion of allochthonous oceanic terranes during early Paleozoic to Cretaceous times, (2) identify the plutons as either preaccretionary or accretionary, and (3) genetically relate the plutonic intrusions to specific accretionary episodes. The eight accretionary episodes portrayed in this report are similar to those shown by Irwin and Mankinen (1998) who briefly described the basis for the timing of the episodes and who illustrated the ~110 degrees of clockwise rotation of the Klamath Mountains since Early Devonian time. Each episode is named for the accreting terrane. In all episodes (Figs. 1-8), the heavy black line represents a fault that separates the accreting oceanic rocks on the left from earlier accreted terranes on the right. The preaccretionary plutons are shown within the accreting oceanic crustal rocks to the left of the heavy black line, and the accretionary plutons in most instances are shown intruding previously accreted terranes to the right. Episodes earlier than the Central Metamorphic episode (Fig. 1), and that may have been important in the formation of the early Paleozoic nucleous of the province (the Eastern Klamath terrane), are not known. The 'Present Time' distribution of the accreted terranes and plutons is shown at a large scale in Figure 9. The schematic vertical section (Fig. 10) depicts the terranes as a stack of horizontal slabs that include or are intruded by vertical plutons. Note that at their base the ~170 Ma preaccretionary plutons of the Western Hayfork subterrane are truncated by the ~164 Ma Salt Creek

  16. Estrategias de mercado para el frijol centroamericano

    Directory of Open Access Journals (Sweden)

    Lourdes Mart\\u00EDnez

    2004-01-01

    Full Text Available Estrategias de mercado para el frijol centroamericano. En los últimos años, el sub-sector de frijol en Centro América ha sido testigo de varios cambios dinámicos. Si no se encuentran medidas para incrementar la competitividad regional de este sub-sector, los países centroamericanos experimentarán impactos negativos en las áreas sociales y económicas de considerable magnitud, especialmente ahora que Centro América necesita ajustar su economía a los nuevos requerimientos de mercados mas abiertos, como el Tratado Centroamericano de Libre Comercio con USA (TLC. Vendedores de frijoles a nivel intermediario y de consumo final, así como técnicos de oficinas gubernamentales dedicadas al mercadeo de frijoles en Centro América fueron entrevistados para documentar los cambios experimentados, identificar los obstáculos que frenan la viabilidad del sub-sector e identificar las oportunidades de incremento de mercados en el futuro para los productores y vendedores de frijol. Los resultados muestran que para que continúen siendo competitivos, los países centroamericanos deben incrementar la productividad a través del apoyo a las investigaciones para el mejoramiento de variedades de frijol, especialmente aquellas que los consumidores prefieren por características específicas (e.g. color. También es imprescindible el fortalecimiento de los programas de distribución de variedades mejoradas a los productores; las mejoras en la transmisión de información de mercado a los productores; el fortalecimiento de los contactos entre productores, comercializadores a nivel mayorista y supermercados; y una política más específica de apertura de mercados de exportación, especialmente con los Estados Unidos.

  17. A PCR detection method for rapid identification of Melissococcus pluton in honeybee larvae.

    Science.gov (United States)

    Govan, V A; Brözel, V; Allsopp, M H; Davison, S

    1998-05-01

    Melissococcus pluton is the causative agent of European foulbrood, a disease of honeybee larvae. This bacterium is particularly difficult to isolate because of its stringent growth requirements and competition from other bacteria. PCR was used selectively to amplify specific rRNA gene sequences of M. pluton from pure culture, from crude cell lysates, and directly from infected bee larvae. The PCR primers were designed from M. pluton 16S rRNA sequence data. The PCR products were visualized by agarose gel electrophoresis and confirmed as originating from M. pluton by sequencing in both directions. Detection was highly specific, and the probes did not hybridize with DNA from other bacterial species tested. This method enabled the rapid and specific detection and identification of M. pluton from pure cultures and infected bee larvae.

  18. The application of mathematical transformation in order to define edges of pluton Valja Strž

    Directory of Open Access Journals (Sweden)

    Ignjatović Snežana M.

    2014-01-01

    Full Text Available The Timok Magmatic Complex (TMC belongs to the East Serbian and is the largest volcanic area in our country. The largest pluton in this area is Valja Strž. This pluton is situated in the northwestern part of the complex. Applying different methods of mathematical transformation on aeromagnetic data facilitated outlining of pluton edges in subsurface of surrounding rocks. In this paper we used mathematical transformation on anomaly values of the magnetic field, obtained from processing of aeromagnetic data. In order to detect the edges of pluton Valja Strž we used following set of mathematical transformation: first vertical derivative, the total horizontal derivative, tilt derivative, upward continuation, and combination of upward continuation and tilt derivative. Results of application of mathematical transformation showed that outspread of the pluton Valja Strž in the subsurface is larger than its extend on the surface.

  19. Analysis on uranium metallogenetic conditions of granite pluton in Ulan Uzhur

    International Nuclear Information System (INIS)

    Lu Yaozu

    2014-01-01

    Qimantage area in Qinghai province is one of the important exploration areas in the present China, Ulan Uzhur complex pluton, located in the compound tectonic magmatic belt of Qimantage, is the main cluster area with uranium mineralization. This paper describes the petrochemical, geochemical, petrophysical and Heishan uranium deposit mineralization characteristics of rocks formed at the different tectonic-magmatic cycles in Ulan Uzhur complex pluton. Uranium metallogenic conditions in Ulan Uzhur complex pluton were analyzed from uranium source, magmatic activity and structure. The research shew that the Ulan Uzhur complex pluton has the petrochemical characteristics of uranium rock and Cisuralian monzonitic granite has the most significant relationship to uranium mineralization, it has the characteristics of high background radiation, many anomalies and pronounced ore-control structure, Heishan uranium deposit was controlled by factors such as pronounced northeast and the northwest structure and alteration. To conclude, Ulan Uzhur complex pluton possesses good uranium metallogenic prospect. (author)

  20. O MARKETING ORIENTADO PELO MERCADO

    Directory of Open Access Journals (Sweden)

    Sandro Deretti

    2005-11-01

    -style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} -->

    Resumo

    A economia globalizada determinou alterações profundas no processo estratégico das empresas, propiciando oportunidades e ameaças em todos os segmentos e exigindo produtos e serviços competitivos. Assim, diante deste cenário extremamente desafiador, a função marketing dentro das empresas assume maior importância no desenvolvimento de vantagens competitivas sustentáveis e na redução das incertezas. Muitos autores consideram que a orientação para o mercado seja a essência da filosofia empresarial que leva ao sucesso nesta luta pelos mercados porque investiga desejos e necessidades do consumidor. Este artigo faz uma contextualização dos principais trabalhos que colaboraram para a estruturação do conceito de marketing e da orientação para o mercado.

     

  1. Mineralization related to Alvand pluton in the Hamadan, western Iran

    Science.gov (United States)

    Salehi, M. H.; Doosti, E. A.; Ahadnejad, V.

    2009-04-01

    The Alvand (Hamadan) plutonic batholith is one of the largest plutonic bodies in the Sanandaj-Sirjan metamorphic belt. This complex is consist of mafic part (gabbro-diorite-tonalite), intermediate (granite-granodiorite porphyroids), and hololeucocratic granitoids. Previous studies have shown that S-type granite-granodiorites are mostly peraluminous and calc-alkaline; the gabbro-diorite-tonalite suite is mostly metaluminous and tholeiitic to calc-alkaline (Sepahi, 2008). High initial 87Sr-86Sr ratios (0.7081 to 0.7115), low epsilon Nd values (-1.0 to -3.3), and peraluminous character reflects a different origin for the granites, possibly crustal sources (Ghalamghash et al, 2007). Aplite-pegmatite dikes are intruded in granitoide rocks, metamorphic rocks and the contact of Alvand granite with metamorphic rocks. The contact of Alvand granite with metamorphic rocks is sharp. By using heavy mineral studies on the alluvium of Alvand complex, it is recognized 28 minerals amongst Scheelite, Cassiterite, Ilmenite, Zircon and Garnet. Different geostatistical studies such as variant, bivariant and multivariant studies have been done on rough data of heavy minerals. They showed normal concentration of gold in studied rocks and low enrichment of tin and tungsten. The index of the ore elements average, frequeney distribution criteria of elements, the ratio of elements index and multielements show that Alvand granite is barren. Mineralography studies did not recognized any tin and tungsten minerals. The grains of gold was recognized in some of the microscopic thin sections. Calcopyrotite is the most important ore mineral that is accompanied with oxides and iron carbonates. The contacts of aplite-pegmatite dikes with granitoide rocks mostly are not prolific. For recognizing Scheelite, some samples of rocks studied by ultraviolet and few Scheelite is recognized in the samples. Some alteration zone observed in this area but they are not accompany with main mineralization. Although

  2. Rb-Sr isochronous age of Vepor pluton granitoids

    International Nuclear Information System (INIS)

    Bagdasaryan, G.P.; Gykasyan, R.Kh.; Cambel, B.

    1986-01-01

    The result are presented of geochronological investigations of the Vepor pluton granitoids by the Rb-Sr isochronous method. The results prove the Variscan age of granodiorite magmatism of the Sihla type (387±27 m.y.) and the Early Variscan age of leucocratic granitoids of the Vepor and the Ipel types (284±22 m.y.). Since the initial ratio of 87 Sr/ 86 Sr in granitoids of the Sihla type is 0.7054 and of the Vepor type 0.7060, it can be assumed that during the formation of the granitoids of veporides there was an increased supply of matter from the main source affecting genesis of granitoids. The results prove a polyphase character of the Variscan granitoids of Veporicum. (author)

  3. Predictibilidad de los retornos en el mercado de Colombia e hipótesis de mercado adaptativo

    Directory of Open Access Journals (Sweden)

    Katherine Julieth Sierra Suárez

    2015-10-01

    Full Text Available Los mercados eficientes son aquellos en los cuales no es posible predecir los retornos de sus activos. No obstante, la hipótesis de mercado adaptativo afirma que la eficiencia no es una característica estática de los mercados, sino que varía en el tiempo de acuerdo a las condiciones del mercado y al comportamiento de sus agentes. Este trabajo busca evaluar la predictibilidad del mercado colombiano, usando el test Ratio de varianza automático en ventanas móviles de tiempo para comprobar si es eficiente, y si la eficiencia es una característica estática o dinámica de este mercado. Los resultados muestran que los índices accionarios de Colombia presentan periodos de predictibilidad y periodos de alta incertidumbre que son consistentes con un mercado adaptativo.

  4. Plutonic rocks of the Median Batholith in southwest Fiordland, New Zealand : field relations, geochemistry, and correlation

    International Nuclear Information System (INIS)

    Allibone, A.H.; Turnbull, I.M.; Tulloch, A.J.; Cooper, A.F.

    2007-01-01

    This paper provides a first description of all major plutonic rock units between Resolution Island and Lake Poteriteri in southwest Fiordland. Plutonic rocks, of which c. 95% are granitoids, comprise c. 60% of the basement in southwest Fiordland. Approximately 50% of the plutonic rocks were emplaced between c. 355 and 348 Ma, 5% at c. 164 Ma, 25% between c. 140 and 125 Ma, and 20% between c. 125 and 110 Ma. These episodes of plutonism occurred in response to terrane amalgamation, continental thickening, and subduction along the convergent margin of Gondwana. Correlatives of Devonian plutonic rocks which occur in Nelson are absent from the area described here. A wide variety of plutonic rocks were emplaced at c. 355-348 Ma. These include relatively small plutons of K- and Rb-rich gabbro-diorite and members of at least three distinct suites of granitoids. Plutons of two-mica ± garnet granodiorite, granite, and minor tonalite share affinities with the S-type Ridge Suite and are the most widespread c. 355-348 Ma old granitoids in southern Fiordland. Plutons rich in Ca, Fe and Zr, depleted in K and Na, and containing quartz diorite, tonalite, and minor granodiorite with the unusual assemblage red-brown biotite, garnet ± hornblende ± clinopyroxene also occur widely in southern Fiordland. These plutons are similar to peraluminous A-type granitoids, indicating A as well as I and S-type plutonism occurred in the Western Province at this time. The Newton River and Mt Evans Plutons have no correlatives amongst c. 355-348 Ma granitoids in southern Fiordland, but their chemistry is similar to that of the older Karamea Suite. Three regional-scale metasedimentary units - locally fossiliferous Fanny Bay Group Buller Terrane rocks in southern Fiordland, Edgecumbe and Cameron Group Takaka Terrane rocks in south-central Fiordland, and undifferentiated Deep Cove Gneiss high-grade metasedimentary rocks of western Fiordland - are all stitched by c. 355-348 Ma old plutons, indicating

  5. High-18O granitic plutons from the Frontenac Axis, Grenville Province of Ontario, Canada

    International Nuclear Information System (INIS)

    Shieh, Y.-N.

    1985-01-01

    18 O/ 16 O ratios have been determined for whole rock as well as coexisting minerals from nine syn- to post-tectonic monzonite and quartz monzonite plutons in the Westport-Gananoque area covering approximately 2500 km 2 . The plutons fall into two distinct isotopic groups: (I) Low- 18 O group: Rideau Lake, Westport, and Wolfe Lake plutons and (II) High- 18 O group: Lyndhurst, Perth Road, Battersea, Gananoque, South Lake and Crow Lake plutons. The 18 O/ 16 O ratios of granitic rocks from the latter group are among the highest ever reported in the literature. The isotopic compositions of samples within each pluton bear no relationship to the sample distance from the intrusive contacts nor are they affected by the types of country rocks into which they are emplaced. Oxygen isotope fractionations among coexisting quartz, feldspar, biotite and magnetite all show normal plutonic values. Thus, all lines of evidence suggest that the monzonite and quartz monzonite plutons did not acquire their characteristic 18 O/ 16 O ratios at the present level of exposure, either by isotopic exchange with the surrounding metasedimentary country rocks or by any post-crystallization low-temperature alteration processes. The results are discussed. (author)

  6. Cretaceous plutonic rocks in the Donner Lake-Cisco Grove area, northern Sierra Nevada, California

    Science.gov (United States)

    Kulow, Matthew J.; Hanson, Richard E.; Girty, Gary H.; Girty, Melissa S.; Harwood, David S.

    1998-01-01

    The northernmost occurrences of extensive, glaciated exposures of the Sierra Nevada batholith occur in the Donner Lake-Cisco Grove area of the northern Sierra Nevada. The plutonic rocks in this area, which are termed here the Castle Valley plutonic assemblage, crop out over an area of 225 km2 and for the most part are shown as a single undifferentiated mass on previously published geological maps. In the present work, the plutonic assemblage is divided into eight separate intrusive units or lithodemes, two of which each consist of two separate plutons. Compositions are dominantly granodiorite and tonalite, but diorite and granite form small plutons in places. Spectacular examples of comb layering and orbicular texture occur in the diorites. U-Pb zircon ages have been obtained for all but one of the main units and range from ~120 to 114 Ma, indicating that the entire assemblage was emplaced in a narrow time frame in the Early Cretaceous. This is consistent with abundant field evidence that many of the individual phases were intruded penecontemporaneously. The timing of emplacement correlates with onset of major Cretaceous plutonism in the main part of the Sierra Nevada batholith farther south. The emplacement ages also are similar to isotopic ages for gold-quartz mineralization in the Sierran foothills west of the study area, suggesting a direct genetic relationship between the voluminous Early Cretaceous plutonism and hydrothermal gold mineralization.

  7. MECANISMOS UTILIZADOS PARA MONITOREAR EL PODER DE MERCADO EN MERCADOS ELÉCTRICOS: REFLEXIONES PARA COLOMBIA

    Directory of Open Access Journals (Sweden)

    Jesús Alonso Botero

    2013-12-01

    Full Text Available El propósito de este trabajo es analizar la viabilidad de la utilización del índice de oferta residual (IOR en el mercado eléctrico mayorista en Colombia, con el fin de promover la competencia. Esto se hace a partir de la revisión de la literatura relacionada con las experiencias internacionales respecto a los mecanismos para monitorear el poder de mercado y del análisis del Documento 118 de la Comisión de Regulación de Energía y Gas (CREG, 2010. La principal conclusión es que el IOR no es un buen mecanismo de control en mercados hidráulicos, mientras que el desarrollo de los mercados de largo plazo ha sido utilizado con gran éxito para mitigar el riesgo de abuso de poder de mercado, seg°n lo muestra la experiencia internacional.

  8. An Archean Geomagnetic Reversal in the Kaap Valley Pluton, South Africa

    Science.gov (United States)

    Layer; Kroner; McWilliams

    1996-08-16

    The Kaap Valley pluton in South Africa is a tonalite intrusion associated with the Archean Barberton Greenstone Belt. Antipodal paleomagnetic directions determined from the central and marginal parts of the pluton record a geomagnetic reversal that occurred as the pluton cooled. The age of the reversal is constrained by an 40Ar/39Ar plateau age from hornblende at 3214 +/- 4 million years, making it the oldest known reversal. The data presented here suggest that Earth has had a reversing, perhaps dipolar, magnetic field since at least 3.2 billion years ago.

  9. Oster pluton (Central Karelia) - the ancient massif of two-feldspar granites of Baltic Shield

    International Nuclear Information System (INIS)

    Kovalenko, A.V.; Rizvanova, N.G.

    2000-01-01

    Geochronological study of two-feldspar granites forming the Oster pluton in the Central Karelia was performed using the methods of U-Pb- and Sm-Nd-dating. U-Pb isotope data for zircons from granite of the Oster pluton correspond to the age of 2876±21 mln. years, whereas Sm-Nd isotope data obtained for three samples of the garnet correspond to the age varying from 3.0 to 3.5 bln. years. The ancient age of granites of the Oster pluton is explained by the presence of a sufficiently powerful crust in the region by that moment [ru

  10. Reconnaissance geochemical exploration of plutons of syenite and shonkinite, southern Asir, Kingdom of Saudi Arabia

    Science.gov (United States)

    Overstreet, W.C.; Assegaff, A.B.; Hussain, M.A.; Naqvi, M.I.; Selner, G.I.; Matzko, J.J.

    1985-01-01

    Reconnaissance geochemical exploration for rare metals in plutons of syenite and shonkinite disclosed generally less than 20 ppm Nb in rocks, wadi sediments, and concentrates. The sparsity of Nb is accompanied by low values for La, Sn, W, Y, and Zr and relatively high but insignificant values for Be and Mo. Base and precious metals are either below their respective limits of determination in the various sample media or are present at background levels commensurate with average crustal abundances in felsic rocks. Pegmatite dikes associated with the syenite plutons are rare and lack vermiculite. The present investigation disclosed no possible ore deposits in the plutons covered by the field work.

  11. Hydrocarbons prospecting using an integrated approach of petrography, geochemistry and modeling of organic matter transformation. Analysis and reconstitution of the thermal history of the central carboniferous basins of Asturias (Spain) and of the Sabinas - Piedras Negras basin (Coahuila, Mexico); Prospection des hydrocarbures par une approche integree de petrographie, geochimie et modelisation de la transformation de la matiere organique. Analyse et reconstitution de l'histoire thermique des Bassins Carbonifere Central des Asturies (Espagne) et Sabinas - Piedras Negras (Coahuila, Mexique)

    Energy Technology Data Exchange (ETDEWEB)

    Piedad-Sanchez, N.

    2004-09-01

    Solid knowledge of the transformation and evolution of organic matter during hydrocarbon generation in sedimentary basins serves to improve natural gas exploration. With this geological problem in mind, the thermal influence on organic matter was analyzed in two basins containing different characteristics (age, composition of organic matter, litho-stratigraphy, depth, thickness of the layers of rock, the maturation of organic matter, etc.) in order to understand the natural processes in generating oil and natural gas. With a view to studying this geological phenomenon, this work outlines the study of the chemical and macerals composition, the coal rank and geochemical characteristics of organic matter in these two sedimentary basins for the first time: The Asturian Central Carboniferous Basin (Spain) and Sabinas - Piedras Negras Basin (Mexico). Moreover, an approach to shed light on the thermal history and evolution of organic matter through 1D modeling in the two basins is developed. The Central Carboniferous Basin in Asturias is an important coal mining area where coal types range from bituminous carbons with high content in volatile matter to anthracite. The petrographical and geochemical study in this region has shown that at the moment of oil and gas exploration, the coals correspond to an efficient expulsion of oil and have been formed in an environment of swamp with a facies rich in vitrinite, low in sulfur and ash and varying in mineral content. As regards the paleo-environmental reconstruction, the bio-markers suggest a swamp with a relatively high water table and a humid climate. The coal type, the vitrinite reflectance and the volatile matter content in the basin show a N-S trend which could be correlated to the paleo-temperatures calculated in this study. These data point to the influence of two thermal gradients in the region: A normal thermal gradient of long duration and an oblique thermal gradient of short duration due to a pluton. The evolution of

  12. Fractures and fracture infillings of the Eye-Dashwa Lakes pluton, Atikokan, Ontario

    International Nuclear Information System (INIS)

    Stone, Denver; Kamineni, D.C.

    1982-01-01

    Fractures in the Eye-Dashwa pluton near Atikokan, Ontario can be subdivided on the basis of their filling materials. These materials include aplite, epidote, chlorite, and gypsum-carbonate-clay, listed in order of decreasing age established from crosscutting relations. Textues indicate that infilling occurred during fracture growth. Continuous cooling of the pluton during fracturing is inferred from the expected crystallization temperatures of fillings. Fracturing began before the pluton was completely solidified (650-600 0 C) and continued to temperatures below 100 0 C. Many fractures appear to have been sealed by the filling materials after initiation but were subsequently sheared and filled by lower temperatue materials. Apparently the majority of fractures formed during or immediately after pluton solidification and new fractures became smaller and more restricted in location as cooling progressed. Fractures and filling materials are seen as important features in assessing the possibility of movement of radionuclides in aqueous solutions away from a nuclear fuel waste repository

  13. Geochemical and chronological characteristics of Xiangcaoping granite pluton in Miaoershan area

    International Nuclear Information System (INIS)

    Li Wuwei; Wang Gan; Chen Weifeng; Zhao Kuidong

    2010-01-01

    Xiangcaoping granite pluton is mainly composed of medium-macro grain porphyritic biotite. The age of signle zircon dated by SHRIMP U-Pb is 211 ± 2 Ma, which suggest s that this pluton was formed during Indosinan. The geochemical characteristics is A > CNK, trace elements spider chart is slightly oblique to the right, enriched in LREE and bears obvious negative Eu anomaly which is similar to that of the S-type granite in South China. High ("8"7Sr/"8"6Sr)_i and low ε_N_d (t) suggest that this pluton was derived from partial melting of middle maturity Precambrian basement rock, which was rich in uranium and had supplied enough U element to the formation of Xiangcaoping granite pluton. (authors)

  14. Iron variation within a granitic pluton as determined by near-infrared reflectance

    Science.gov (United States)

    Baird, A. K.

    1984-01-01

    One-hundred fifty-one previously chemically analyzed samples of tonalite from the Lakeview Mountains pluton, southern California batholith, were analyzed for their iron content using near-infrared spectrophotometry. Compared to the earlier analyses of the same sample set by X-ray fluorescence spectrography, the infrared data have higher analytical variance but clearly define patterns of compositional zonation in the pluton which are closely similar to those patterns obtained from X-ray data; petrogenetic interpretations for the pluton would be the same from either data set. Infrared spectral data can be obtained directly in the field with relatively simple instruments and field measurements can be made to average local heterogeneities that often mask significant plutonic variations.

  15. Bedrock geologic map of the Knox Mountain pluton area, Marshfield and Peacham, Vermont

    Data.gov (United States)

    Vermont Center for Geographic Information — Digital Data from VG08-3 Kim, J., Charnock, R., Chow, D. and Springston, G., 2008, Bedrock geologic map of the Knox Mountain pluton area, Marshfield and Peacham,...

  16. Discussion on the petrochemistry characteristics and uranium deposit of Xiazhuang pluton in northern Guangdong province

    International Nuclear Information System (INIS)

    Wu Jiguang

    2011-01-01

    The element characteristic of Indo-Chinese epoch Xiazhuang granite is rich in silicon (SiO 2 =69.13%∼73.39%), alkalis (K 2 O+Na 2 O=7.49%∼8.69%), the ASI=1.01∼1.21 and ratio of w (K 2 O)/w (Na 2 O)>1, Xiazhuang pluton is belong to high potassium calcium-alkaline and aluminous series rocks. It shows that the pluton is typical S-type granite, little part is A-type granite character. Under the extension tectonic setting of lithosphere, the Xiazhuang pluton is partial melting product that making up metamorphic mud and sandstone together. By analysing the tectonic setting,the pluton is belong to post-collision granite that original rock provide abundant of uranium content for granite and the tectonic setting of forming provide the moving channels and occurrence space for uranium deposit. (authors)

  17. A review on the nomenclature of Angadimogar and Kumbdaje plutons, Kasaragod district, Kerala

    Digital Repository Service at National Institute of Oceanography (India)

    AnilKumar, A.; Gopinathan, V.; Gopinath, K.S.; Rao, V.P.

    These granites are coarse grained and traversed by anastomising patches of aplite They are in sharp contact with the country rock The Angadimogar pluton was earlier considered a syenitic body Normative mineralogy and petrography of the Angadimogar and Kumbdaje...

  18. Searching pristine source of two gabbric plutons outcroping in Central Sierras Pampeanas Range, Argentina

    International Nuclear Information System (INIS)

    Daziano, C.; Ayala, R.

    2010-01-01

    This work is about the study of two gabbric plutons outcrop ing throughout Central Sierras Pampeanas range (Cordoba province, Argentina). San Lorenzo hill gabbric plutons is in the Upper proterozoic age whereas Cañada del Puerto belongs to the Early proterozoic.They are stock-type igneous bodies and they are intrusive s in an Upper Precambrian crystalline basement; it is mainly composed by gneisses, migmatites, schistes, marbles, amphibolite s, tact's, serpentinites and related rocks

  19. Petrology and Geochemistry of Neoproterozoic Arc Plutons Beneath the Atlantic Coastal Plain, SRS, SC

    Energy Technology Data Exchange (ETDEWEB)

    Maryak, M.

    1998-10-21

    In this report is presented first a brief review of the regional geologic setting of the Savannah River Site, descriptions of the plutonic rock units sampled here, whole rock geochemical data on the plutonic igneous rocks, and finally, a discussion of how the crystalline basement rocks of the Savannah River Site formed and how they may correlate with other terranes exposed in the Piedmont of the Carolinas, Georgia, and Virginia.

  20. Geochemistry and U/Pb geochronology of the Neuvy-Bouin pluton (Vendean Haut-Bocage): an example of a multistage granite pluton

    International Nuclear Information System (INIS)

    Cuney, M.; Brouand, M.; Dautel, D.; Michard, A.; Stussi, J.M.; Poncet, D.; Bouton, P.; Colchen, M.; Vervialle, J.P.

    1993-01-01

    New geological, structural and geochemical data show the presence of at least four magmatic units in the Neuvy-Bouin massif. U/Pb zircon age (340±4 Ma) obtained on the Largeasse granites indicates that in the Neuvy-Bouin pluton the magmatic activity began during Visean times. The emplacement of the Largeasse granites is followed by the aluminopotassic two-mica granites of Pougne-Herisson and by two mica leucogranites. The small high-K calc-alkaline granite body discovered in the Neuvy-Bouin pluton represents the first occurrence of this type of magmatism in the area

  1. O Mercado Único Digital Europeu

    Directory of Open Access Journals (Sweden)

    Fernanda Ferreira Dias

    2016-11-01

    Full Text Available A Internet e as tecnologias digitais estão a transformar o nosso mundo a todos os níveis e invadem todos os aspetos da nossa vida. Na União Europeia, quando o Mercado Único Digital funcionar em pleno, oferecerá novas oportunidades para dinamizar a economia; é atualmente uma das áreas mais importantes e que mais desafios apresenta em termos de progresso e crescimento. O Mercado Único Digital Europeu exige um quadro jurídico que permita o desenvolvimento dos vários aspetos que abrange, e que vão desde o comércio eletrónico, à administração pública em linha, infraestruturas de telecomunicações, fiscalidade, direitos de autor, conectividade dos dados, segurança ou privacidade dos dados pessoais. A “Estratégia para o Mercado Único Digital na Europa” enquadra esta ação. O Mercado Único Digital está em curso e tem por objetivo eliminar as barreiras regulamentares existentes nos mercados nacionais dos 28 Estados-membros da União Europeia para um único mercado europeu. Este artigo revela os passos que a União Europeia e os seus Estados-membros estão a dar para a concretização deste objetivo e tem obviamente o enfoque na participação de Portugal nesse contexto, no ano em que se realiza em Lisboa, pela primeira vez, a Web Summit – o maior evento de empreendedorismo tecnológico ao nível europeu. | "The European Digital Single Market". The Internet and digital technologies are transforming our world at all levels and invade all aspects of our lives. When the European Digital Single Market will be fully operational, it will offer new opportunities to boost the European Union’s economy; it is currently one of the most important and challenging areas in terms of progress and growth. The European Digital Single Market requires a legal framework for the development of various aspects ranging from e-commerce to e-government, telecommunications infrastructure, taxation, copyright, data connectivity, security or privacy of

  2. Research on the age and origin of Hongshan pluton in north Guangdong

    International Nuclear Information System (INIS)

    Zhu Ba; Deng Peng; Ling Hongfei; Shen Weizhou; Tan Zhengzhong

    2009-01-01

    Located in the midwest of south Zhuguangshan composite pluton, Hongshan pluton is constituted by biotite granite and two-micro granite. The SHRIMP U-Pb age of zircons from the pluton is 155±2 Ma, which belongs to Yanshanian. Hongshan pluton is rich in silicon (SiO 2 =76.08%∼77.25%) and alkali(K 2 O+Na 2 O=8.78%∼9.43%), low in ACNK value (0.94∼1.07) and CaO/Na 2 O value (0.10∼0.19). In trace elements, the pluton is rich in Rb, Th, U, depleted in Ba, Sr, P, Ti and has high Rb/Sr (30.02∼930.9), Rb/Ba (18.91∼231.8), has low LREE/HREE value (1.99∼2.40) and remarkable Eu depletion (δEu=0.01∼0.07), has low Σ Nd (t) value (-10.2∼-12.0) and old Nd model age(1777∼1923 Ma). All the evidence indicate that it have the characteristic of S type granite. Hongshan pluton is believed to be formed by partial melting of protozoic rocks, which related to the reactivation of Qitianling-Zhuguangshan (east-west) fracture zones resulted from the subduction of Pacific plate. (authors)

  3. Geological, geochemical and isotopic characteristics of the Archaean Kaap Valley pluton, Barberton mountain land, South Africa

    International Nuclear Information System (INIS)

    Robb, L.J.; Barton, J.M. Jr.; Kable, E.J.D.; Wallace, R.C.

    1984-01-01

    The Kaap Valley pluton consists predominantly of a homogeneous weakly foliated, hornblende-bearing tonalite. It is among the oldest granitoid bodies yet recognized in the environs of the Barberton greenstone belt, yielding 207 Pb/ 206 Pb mineral ages of about 3300 Ma and a Rb-Sr whole rock isochron age of about 3500 Ma. The Kaap Valley pluton is distinctive in many respects. Whereas all other gneiss plutons in the area are characterized by a trondhjemitic bulk composition with mafic mineralogies dominated by biotite, the Kaap Valley pluton is tonalitic in bulk composition with hornblende (plus minus minor biotite) as its major mafic phase. In this paper, the results of a detailed geological, geochemical and Pb-isotopic study of the Kaap Valley pluton are presented. Questions relating to the origin of the body are considered, with an emphasis on the formation of a tonalitic magma which is more mafic than those typically encountered in the region. Although exposure does not permit a detailed structural study of the gneiss pluton consideration is given to its mode of emplacement

  4. Some geomorphological features of the Orhaneli Pluton: Implications for denudation history

    Directory of Open Access Journals (Sweden)

    Ahmet Evren ERGİNAL

    2008-12-01

    Full Text Available The granitic intrusions of the variable age of cooling, size and mineral composition are widely exposed in the northwest Anatolia, Turkey. The nearly circular Orhaneli Pluton emplaced during the Early Eocene with some 15 km in diameter, is one of such plutonic bodies. Geomorphological features of the pluton are discussed here with special emphasis given on the denudation history. To this end, evidence from two isolated Inselberglike hills as remnants of roof rocks in the centre of the pluton and episodically emergence of granite landforms of etch origin after unroofing process were investigated. Field data reveal the absence of granodiorite clasts within Early to Middle Miocene lacustrine deposits in the north of the pluton, implying that the pluton might not have been exposure prior to Upper Miocene as a whole. After the first exposure, the granite landforms, such as boulders, corestones and tors constituting sound evidence of an etch origin, became exposure by continual removing of regolith cover by surficial runoff. These forms of various scale were formed at first by subsurface weathering and shaped by surficial weathering processes after any stages of removal of the regolith cover. Drainage segments accounted for removal of regolith is mostly structurally controlled defined by NW-SE, NE-SW and N-S-aligned fracture systems.

  5. Panorama Pluton : a composite gabbro-monzodiorite early Ross Orogeny intrusion in southern Victoria Land, Antarctica

    International Nuclear Information System (INIS)

    Mellish, S.D.; Cooper, A.F.; Walker, N.W.

    2002-01-01

    The Koettlitz Glacier Alkaline Province of the Walcott Glacier to Radian Glacier area of the Transantarctic Mountains contains a diverse suite of intrusions ranging from gabbro and diorite to granite, nepheline syenite, and carbonatite. Most of the plutons are alkaline (A-type), although the Panorama Pluton is mafic, comprising both hypersthene normative gabbroic and quartz normative monzodioritic lithologies. The pluton has a composite nature, determined by whole-rock geochemical trends and Nd-Sr isotope data that reflect distinctive source regions for the different components. U-Pb geochronology of zircon and titanite indicates the Panorama Pluton was intruded during the early stages of the Neoproterozoic-early Paleozoic Ross Orogeny at 535 ± 9 Ma, and that it is coeval with the geochemically similar Dromedary Mafic Complex which crops out 10 km to the southeast. The Panorama Pluton is a volumetrically minor mafic component of the Koettlitz Glacier Alkaline Province, which predates, by at least 15 m.y., the dominant calc-alkaline suites that occur along-strike in the Dry Valleys area to the north, and the central Transantarctic Mountains to the south. The Panorama Pluton magmas, and other Koettlitz Glacier Alkaline Province lithologies, are interpreted to have formed in an extensional or transtensional jog that predates the onset of widespread Ross Orogeny subduction. (author). 48 refs., 7 figs., 3 tabs

  6. Funcionamiento del Mercado Común

    OpenAIRE

    Martínez Puñal, Antonio

    1985-01-01

    Unión aduanera: Arancel Aduanero Común. Legislación general. Simplificación de las formalidades aduaneras. Valor en aduana. Origen de las mercancías. Regímenes aduaneros económicos. Política arancelaria. Mercado interior y asuntos industriales: Libre circulación de mercancías. Libre circulación de personas y libre prestación de servicios. Derecho económico comercial. Problemas industriales. Entorno jurídico de las empresas. Pequeñas y medianas empresas. Competencia: General. Alianzas, concent...

  7. Alternativas para incrementar la liquidez del mercado de energía mayorista colombiano: el caso del mercado no regulado

    OpenAIRE

    García Gómez, Diego Felipe; Mejía Sierra, Diego Fernando

    2013-01-01

    El presente estudio tiene como objetivo la presentación de alternativas que contribuyan a aumentar la liquidez del mercado no regulado de energía eléctrica en Colombia -- Para ello se parte de una revisión general del mercado eléctrico colombiano, posteriormente se introduce el concepto liquidez, haciendo énfasis en la liquidez en mercados eléctricos y se referencian algunos mercados eléctricos desarrollados en Europa, Norte América, Países Nórdicos e Inglaterra -- Se concluye que es necesari...

  8. El mercado balcón o segundo mercado como alternativa de participación de las PYMES en el mercado de capitales de Colombia

    Directory of Open Access Journals (Sweden)

    Moisés Quevedo Céspedes

    2015-02-01

    Teniendo como base el informe final del trabajo, presentado por estudiantes de último nivel del programa de Administración de Empresas y de la Especializaciación en Administración Financiera. el cual tuve la oportunidad de dirigir durante dos periodos académicos, presento a consideración de la academia el resultado del estudio sobre el mercado balcón o segundo mercado como alrternativa de participación de las PYMES en el mercado de capitales de Colombia.

  9. El mercado balcón o segundo mercado como alternativa de participación de las PYMES en el mercado de capitales de Colombia

    OpenAIRE

    Moisés Quevedo Céspedes

    2015-01-01

    RESUMEN Teniendo como base el informe final del trabajo, presentado por estudiantes de último nivel del programa de Administración de Empresas y de la Especializaciación en Administración Financiera. el cual tuve la oportunidad de dirigir durante dos periodos académicos, presento a consideración de la academia el resultado del estudio sobre el mercado balcón o segundo mercado como alrternativa de participación de las PYMES en el mercado de capitales de Colombia.

  10. Reestructuración productiva y desplazamiento pendular de la fuerza de trabajo en la Cuenca Carbonífera de Coahuila, México

    Directory of Open Access Journals (Sweden)

    Camilo Contreras Delgado

    2001-09-01

    Full Text Available The purpose of this paper is to analyze the day-to-day spatial pattern make-up within an economic restructuring framework. Coahuila´s Coal Basin was an economic region based on mining from the late 19thcentury until nearly the late 1980s, During this long period, the mining-works market was characterized by the workers pendular mobility (between places of residence and labor. Today, with a privatized steel industry (and also the remaining mining industry, and the appearance of the maquila (contract-manufacturing industry in the region, the labor market has diversified in economic activity and share therein. However, although this mobility is still at the core of labor market, conditions have changed, since workers increasingly resent this daily mobility process.

  11. Conhecimento, aprendizagem organizacional e poder na rede: um estudo de caso na Secretaria de Educação e Cultura de Coahuila, México

    Directory of Open Access Journals (Sweden)

    Bruno Luiz Américo

    2014-04-01

    Full Text Available O presente estudo parte da lacuna identificada de estudos de aprendizagem organizacional e poder. Para isso, tem como objetivo analisar a relação entre conhecimento, aprendizagem organizacional e poder, que permite controle, a partir da implantação, seguimento e avaliação de um Programa Nacional de Ensino de Inglês pela Coordenação da Secretaria da Educação e Cultura em Coahuila, México. Como referencial, vale-se da literatura de aprendizagem e conhecimento, poder e controle. Especificamente, versa sobre: a força ordenadora dos elementos textualizados na rede. Por meio de um estudo de caso qualitativo verificou-se como se dá o fluxo do conhecimento (acúmulo e utilização e o exercício de poder, onde mediadores atuam, configurando o processo de aprendizagem individual e organizacional.

  12. Poder del mercado, eficiencia y racionalidad

    Directory of Open Access Journals (Sweden)

    Francisco A. González R.

    1988-04-01

    Full Text Available RESUMEN El autor plantea en el presente  artículo algunas reflexiones sobre la relación entre el progreso económico y el bienestar social, señalando la conveniencia de que el estado mediante su intervención garantice una igualdad de oportunidades de la población en relación con la distribución del ingreso de forma que pueda acceder a la satisfacción adecuada de sus necesidades. Según el artículo, el libre juego de las fuerzas del mercado no conduce a una distribución satisfactoria y si bien dicho mercado puede ser eficiente, es posible que no se caracterice por su equidad o justicia distributiva. Una alternativa planteada es la descentralización de las decisiones de los planificadores del estado hacia productores individuales y una mayor aproximación de la producción a la demanda,  con una intervención del estado en la creación de incentivos a la rentabilidad de las empresas. En últimas se plantea la combinación de mecanismos propios de economías socialistas con la economía capitalista que nos caracteriza.

  13. Magnetic properties of ilmenite-hematite single crystals from the Ecstall pluton near Prince Rupert, British Columbia

    DEFF Research Database (Denmark)

    Brownlee, Sarah J.; Feinberg, Joshua M.; Kasama, Takeshi

    2011-01-01

    Paleomagnetic studies of the 91 Ma Ecstall pluton and other Cretaceous plutons of British Columbia imply large northward tectonic movements (>2000 km) may have occurred during the tectonic evolution of western North America. However, more recent studies have shown that the eastern edge...... of the Ecstall pluton experienced considerable mineralogical changes as younger Eocene plutons, such as the ∼58 Ma Quottoon Pluton, were emplaced along its margins. We investigated changes in the rock magnetic properties associated with this reheating event by examining isolated grains of intergrown ilmenite...... and hematite, the primary paleomagnetic recorder in the Ecstall pluton. Measurements of hysteresis properties, low-temperature remanence, and room temperature isothermal remanent magnetization acquisition and observations from magnetic force microscopy and off-axis electron holography indicate that samples...

  14. Constraints on the depth of generation and emplacement of a magmatic epidote-bearing quartz diorite pluton in the Coast Plutonic Complex, British Columbia

    Science.gov (United States)

    Chang, J.M.; Andronicos, C.L.

    2009-01-01

    Petrology and P-T estimates indicate that a magmatic epidote-bearing quartz diorite pluton from Mt. Gamsby, Coast Plutonic Complex, British Columbia, was sourced at pressures below ???1.4 GPa and cooled nearly isobarically at ???0.9 GPa. The P-T path indicates that the magma was within the stability field of magmatic epidote early and remained there upon final crystallization. The pluton formed and crystallized at depths greater than ???30 km. REE data indicate that garnet was absent in the melting region and did not fractionate during crystallization. This suggests that the crust was less than or equal to ???55 km thick at 188 Ma during the early phases of magmatism in the Coast Plutonic Complex. Late Cretaceous contractional deformation and early Tertiary extension exhumed the rocks to upper crustal levels. Textures of magmatic epidote and other magmatic phases, combined with REE data, can be important for constraining the P-T path followed by magmas. ?? 2009 Blackwell Publishing Ltd.

  15. Is there a geochemical link between volcanic and plutonic rocks in the Organ Mountains caldera?

    Science.gov (United States)

    Memeti, V.; Davidson, J.

    2013-12-01

    Results from separate volcanic and plutonic studies have led to inconsistent conclusions regarding the origins and thus links between volcanic and plutonic systems in continental arcs and the magmatic processes and time scales responsible for their compositional variations. Some have suggested that there is a geochemical and geochronological disconnect between volcanic and plutonic rocks and hence have questioned the existence of magma mush columns beneath active volcanoes. Investigating contemporary volcanic and plutonic rocks that are spatially connected is thus critical in exploring these issues. The ca. 36 Ma Organ Mountains caldera in New Mexico, USA, represents such a system exposing contemporaneous volcanic and plutonic rocks juxtaposed at the surface due to tilting during extensional tectonics along the Rio Grande Rift. Detailed geologic and structural mapping [1] and 40Ar/39Ar ages of both volcanics and plutons [2] demonstrate the spatial and temporal connection of both rock types with active magmatism over >2.5 myr. Three caldera-forming ignimbrites erupted within 600 kyr [2] from this system with a total erupted volume of 500-1,000 km3 as well as less voluminous pre- and post-caldera trachyte and andesite lavas. The ignimbrite sequence ranges from a crystal-poor, high-SiO2 rhyolite at the base to a more crystal-rich, low-SiO2 rhyolite at the top. Compositional zoning with quartz-monzonite at the base grading to syenite and alaskite at the top is also found in the Organ Needle pluton, the main intrusion, which is interpreted to be the source for the ignimbrites [1]. Other contemporaneous and slightly younger plutons have dioritic to leucogranitic compositions. We examined both volcanic and plutonic rocks with petrography and their textural variations with color cathodoluminescence, and used whole rock element and Sr, Nd and Pb isotope geochemistry to constrain magma compositions and origins. Electron microprobe analyses on feldspars have been completed to

  16. Geochemical characteristics and genesis of Baiyun pluton in southern Zhuguangshan mountain

    International Nuclear Information System (INIS)

    Zhang Shanguo; Huang Guolong; Fu Shuncheng; Wang Xiaodong; Xu Lili; Shen Weizhou

    2011-01-01

    Located in the east-central of the southern Zhuguangshan complex pluton, Baiyun pluton is an important uranium producing pluton. In lithology, it is coarse grain black mica granite. In major elements, the pluton is with rich silicon (SiO 2 average for 73.47%), rich aluminum (A/CNK value average 1.09) and high ratio of K 2 O/Na 2 O (average for 1.99). It is rich in large-ion trace elements Rb, Th, but poor in Ba, Sr, Ti, Nb, Ta, P. Rock samples have high Rb/Sr (average for 6.22) and Rb/ Nb ratio (average for 1.447), and rich uranium (average for 9.04 x 10 -6 ) which can act as the source for the formation of uranium deposit. In REE chemistry, the pluton is rich in LREE and relatively high fractionation between LREE and HREE, and bear the right-wing-type distribution pattern with obviously Eu depletion. In Isotopic chemistry,the pluton has low ε Nd (t) value(average for -10.6), high ( 87 Sr/ 86 Sr) i value (average for 0.71688), and old Nd mode age (1865∼1874 Ma). These characteristics consistently show that Baiyun pluton belongs to typical crustal source granite type and formed in an extensional tectonic environment shortly after the collision between South China and Indo-China plate from partial melting of argillaceous rocks in the middle-lower crust due to the comprehensive action of the decompression, water-prodution and mantle upwelling induced by crust stretching and thinning. (authors)

  17. Natural radioactivity levels in granitic plutons and groundwaters in Southeast part of Eskisehir, Turkey

    Energy Technology Data Exchange (ETDEWEB)

    Oerguen, Y. [Faculty of Mines, Istanbul Technical University (ITU), Ayazaga Kampusu, 34469 Istanbul (Turkey)]. E-mail: orgun@itu.edu.tr; Altinsoy, N. [Institute of Energy, Istanbul Technical University (ITU), Ayazaga Kampusu, 34469 Istanbul (Turkey); Gueltekin, A.H. [Faculty of Mines, Istanbul Technical University (ITU), Ayazaga Kampusu, 34469 Istanbul (Turkey); Karahan, G. [Cekmece Nuclear Research and Training Center, P.O. Box 1, Atatuerk Airport, 34149 Istanbul (Turkey); Celebi, N. [Cekmece Nuclear Research and Training Center, P.O. Box 1, Atatuerk Airport, 34149 Istanbul (Turkey)

    2005-08-01

    The present work investigated the radioactivity level of the granitoid plutons and its effect on the groundwaters in the southeast part of Eskisehir. Fourteen granitic samples from the Kaymaz and Sivrihisar plutons and 11 groundwater samples from the near vicinity of the pluton were analyzed. The activity concentrations measured for {sup 238}U and {sup 232}Th ranged from 43.59{+-}2 to 651.80{+-}24 Bq/kg, and 51.16{+-}3 to 351.94{+-}13 Bq/kg, respectively. The activity concentrations obtained for {sup 40}K varied from 418.50{+-}17 to 1618.03{+-}66 Bq/kg. The absorbed dose rates in air outdoors ranged from 87.14 to 531.81 nGy/h. All the results obtained from the Kaymaz pluton are higher than those from the Sivrihisar. The U (ave. 16.6 ppm) and Th (ave. 49.9 ppm) values of the Kaymaz pluton are higher than the average concentrations of the magmatic rocks of granitic composition. These results are consistent with high dose rates of the pluton. The gross-{alpha} activities in the groundwater samples ranged from 0.009 to 1.64 Bq/l and the gross-{beta} activities from 0.006 to 0.89 Bq/l. The highest gross-{alpha} value was found in the sample taken from near the Kaymaz pluton. The concentrations of {sup 222}Rn varied from 0.060 to 0.557 Bq/l.

  18. New records of Libellula pulchella (Odonata: Libellulidae and Phyllogomphoides albrighti (Odonata: Gomphidae from the Cuatro Ciénegas Basin, Coahuila, Mexico Nuevos registros de Libellula pulchella (Odonata: Libellulidae y Phyllogomphoides albrighti (Odonata: Gomphidae para el valle de Cuatro Ciénegas, Coahuila, México

    Directory of Open Access Journals (Sweden)

    Enrique González-Soriano

    2012-09-01

    Full Text Available The first records of Libellula pulchella and Phyllogomphoides albrighti from Coahuila are reported. These records extend the known geographic range of Libellula pulchella south of Texas and Phyllogomphoides albrighti west of Nuevo León. The specimens were collected in the Cuatro Ciénegas Basin, one of the most biologically interesting areas for the study of aquatic insects.Se presentan los primeros registros de Libellula pulchella y Phyllogomphoides albrighti para Coahuila. Ambas especies extienden su distribución geográfica conocida más allá del sur del estado de Texas y más allá del oeste de Nuevo León, respectivamente. Los ejemplares fueron recolectados en la región del valle de Cuatro Ciénegas, uno de los lugares más interesantes para el estudio biológico de insectos con hábitos acuáticos en algún estadio.

  19. LA-ICPMS zircon U-Pb age of Maofeng pluton of uranium deposit No.337 and its significance

    International Nuclear Information System (INIS)

    Zhang Zhanshi; Hua Renmin; Yao Junmin; Gu Shengyan; Deng Ping; Wu Lieqin

    2007-01-01

    Maofeng pluton is the most important uranium-host granite in Xiazhuang uranium orefield. The accurate granite formation age and its evolution history is crucial for understanding the mineralization in this district. LA-ICPMS zircon dating was applied in this paper and found the formation age of Maofeng pluton is 238.2 ± 2.3 Ma which suggests that Maofeng pluton was produced in the Indosinian magmatic event. Uranium mineralization age of No.337 deposit is commonly recognized to be 138 Ma. Therefore No.337 uranium deposit was not the typical magma hydrothermal deposit due to the long time gap between the pluton formation and the uranium mineralization. (authors)

  20. Oxygen and hydrogen isotope studies of plutonic granitic rocks

    International Nuclear Information System (INIS)

    Taylor, H.P. Jr.

    1978-01-01

    The primary deltaD values of the biotites and hornblendes in granitic batholiths are remarkably constant at about -50 to -85, identical to the values in regional metamorphic rocks, marine sediments and greenstones, and most weathering products in temperate climates. Therefore the primary water in these igneous rocks is probably not 'juvenile', but is ultimately derived by dehydration and/or partial melting of the lower crust or subducted lithosphere. Most granitic rocks have delta 18 O = +7.0 to +10.0, probably indicating significant involvment of high- 18 O metasedimentary or altered volcanic rocks in the melting process; such an origin is demanded for many other granodiorites and tonalites that have delta 18 O = +10 to +13. Gigantic meteoric-hydrothermal convective circulation systems were established in the epizonal portions of all batholiths, locally producing very low delta 18 O values (particularly in feldspars) during subsolidus exchange. Some granitic plutons in such environments also were emplaced as low- 18 O magmas probably formed by melting or assimilation of hydrothermally altered roof rocks. However, the water/rock ratios were typically low enough that over wide areas the only evidence for meteoric water exchange in the batholiths is given by low D/H ratios (deltaK as low as -180); for example, because of latitudinal isotopic variations in meteoric waters, as one moves north through the Cordilleran batholiths of western North America an increasingly higher proportion of the granitic rocks have deltaD values lower than -120. The lowering of deltaD values commonly corelates with re-setting of K-Ar ages. (Auth.)

  1. Magmatic apatite - a window into melt evolution of the Dalgety pluton.

    Science.gov (United States)

    Pope, M. D.; Tailby, N.; Webster, J. D.

    2017-12-01

    The Dalgety Pluton is located in the Lachlan Fold Belt in southeastern Australia, and is a coarse grained, peraluminous, S-type, biotite granodiorite. Historically, pluton emplacement has been thought of as cooling from a single, large body of magma over a geologically quick period. Current studies suggest issues with this model and propose a slower, incremental model of emplacement in some settings (Glazner et al., 2004). This work proposes that the emplacement of the Dalgety Pluton occurred in incremental phases demonstrated through halogen, minor, and trace element concentrations in apatites. Apatites from 13 samples collected along a north-south transect of the pluton were analyzed using a 5-spectrometer Cameca SX-100 calibrated for seventeen elements (F, Na, Cl, P, Mg, Al, Si, Ca, S, K, Ti, Mn, Fe, Sr, Ba, La, and Ce) at the American Museum of Natural History. The majority of apatites are fluorapatites, having >50 % F, <15 % Cl, and <25 % OH (calculated from Ketchum et al., 2015). However, the concentrations of the halogens vary throughout the pluton with the highest Cl concentrations near the southern edge. Two of the minor elements, Mn and Fe, also show distinct variation with the lowest concentrations being 0.35 wt% in Mn and 0.25 wt% in Fe and the highest being 1.10 wt% and 0.95 wt%, respectively. Trace elements Ce and La vary as well with their highest concentrations being 0.29 wt% and 0.11 wt% and their lowest for both being below the detection limit of the electron probe. Elemental variation across the pluton is seen in the concentration of minor elements and halogens with a sharp increases at 10,000 meters and again at 21,000 meters from the southern rim of the pluton. Similar shifts in concentration are also seen in the trace elements, however the concentrations decrease at these distances. These wholesale elemental fluctuations in composition are indicative of a dramatic shift in melt composition supporting the hypothesis of multiple melt injection

  2. Strontium and oxygen isotopic variations in mesozoic and tertiary plutons of central Idaho

    International Nuclear Information System (INIS)

    Fleck, R.J.; Criss, R.E.

    1985-01-01

    Regional variations in initial 87 Sr/ 86 Sr ratios (rsub(i)) of Mesozoic plutons in central Idaho locate the edge of Precambrian continental crust at the boundary between the late Paleozoic-Mesozoic accreted terranes and Precambrian sialic crust in western Idaho. The rsub(i) values increase abruptly but continuously from less than 0.704 in the accreted terranes to greater than 0.708 across a narrow, 5 to 15 km zone, characterized by elongate, lens-shaped, highly deformed plutons and schistose metasedimentary and metavolcanic units. The chemical and petrologic character of the plutons changes concomitantly from ocean-arc-type units to a weakly peraluminous, calcit to calcalkalic suite. Plutons in both suites yield Late Cretaceous ages, but Permian through Early Cretaceous bodies are confined to the accreted terranes and early Tertiary intrusions are restricted to areas underlain by Precambrian crust. The two major terranes were juxtaposed between 75 and 130 m.y. ago, probably between 80 and 95 m.y. Oxygen and strontium isotopic ratios and Rb and Sr concentrations of the plutonic rocks document a significant upper-crustal contribution to the magmas that intrude Precambrian crust. Magmas intruding the arc terranes were derived from the upper mantle/subducted oceanic lithosphere and may have been modified by anatexis of earlier island-arc volcanic and sedimentary units. (orig./PW)

  3. The research on the geochemical characteristics of Longyuanba composite pluton in Nanling region

    International Nuclear Information System (INIS)

    Zhang Min; Chen Peirong; Ling Hongfei

    2006-01-01

    The Longyuanba composite pluton, located in the eastern part of the Nanling Range, is an important part of the Nanling granites belt, which was regarded as a portion of Yanshanian epoch Pitou pluton to the east of it, and was lowly studied. The newest research shows that, the main body of Longyuanba pluton formed in Indosinian, different from Pitou pluton, which is Yanshanian. From main elements geochemical characteristics, there is obvious gap between Indosinian granites, Yanshanian granites and Yanshanian syenites in major oxides composition, which implies that there is possibly no fractional crystallization relationship between them. Form trace element geochemical characteristics, Indosinian Σ granites are enriched in LREE and high in REE. Yanshanian granites are depleted in MREE and low in Σ REE and ratios of Th/U, Nb/Ta, Zr/Hf, and obvious in fraction. The above characteristics show that, liquid action was rather strong in Yanshanian magmatism. Yanshanian syenites are enriched in high field elements and REE, are similar with A-type granite. Sr, Nd isotopic geochemical characteristics show that, Longyuanba composite pluton belongs to crust-original S-type granite and its original resource is early-Proterozoic crust from crust-mantle fraction. (authors)

  4. Lateral extrusion of a thermally weakened pluton overburden (Campiglia Marittima, Tuscany)

    Science.gov (United States)

    Vezzoni, Simone; Rocchi, Sergio; Dini, Andrea

    2017-10-01

    The ascent and emplacement of magmas in the upper crust modify the local pre-existing thermal and rheological settings. Such changes have important effects in producing anomalous structures, mass extrusion, rock fracturing, and in some conditions, hydrothermal mineralizations. In the Campiglia Marittima area, detailed field mapping led to the reconstruction of a local deformation history that overlaps, chronologically and spatially, with regional extension. This local deformation was triggered at the Miocene-Pliocene boundary by the intrusion of a monzogranitic pluton beneath a carbonate sedimentary sequence. The emplacement of the pluton produced a perturbation in the rheological behaviour of the carbonate host rocks, producing transient ductile conditions in the very shallow crust. The carbonate rocks were thermally weakened and flowed laterally, accumulating downslope of the pluton roof, mainly toward the east. As the thermal anomaly was decaying, the brittle-ductile boundary moved progressively back towards the pluton, and large tension gash-shaped volumes of fractured marble were generated. These fractured volumes were exploited by rising hydrothermal fluids generating sigmoidal skarn bodies and ore shoots. This work presents the Campiglia Marittima case study as a prime example of structural interference between regional extensional structures and local, lateral mass extrusion in a transient ductile rheological regime triggered by pluton emplacement.

  5. El higo y sus posibilidades de mercado

    Directory of Open Access Journals (Sweden)

    Sonia Barboza Flores

    2008-04-01

    Full Text Available Este proyecto tuvo como objetivo general “promover la diversificación agrícola del país mediante la generación de tecnologías para la producción e industrialización del cultivo del higo (Ficus carica, así como el establecimiento de nuevas alternativas de mercados y comercialización del producto, con el fin de mejorar las condiciones de vida de los productores”. Como parte de este se procuró el cumplimiento de objetivos específicos como el de “contar con información sobre el estado de la oferta y de la demanda de higo en el país, así como el comportamiento de los precios y de los canales de comercialización existentes” y, también, “ recopilar información sobre la opinión de los consumidores con respecto a las características sensoriales de los productos elaborados a base de higo por el Centro de Investigación en Gestión Agroindustrial, así como medir la eventual intención de compra”.Para estos efectos, se evaluaron distintos factores relacionados con la producción nacional y el uso actual del fruto en su estado fresco y procesado. Además, tomando como base el desarrollo de dos nuevos productos procesados, se hace una evaluación de estos para determinar la aceptación del producto en un mercado regional y para determinar los posibles ajustes que deban hacerse en la formulación del producto.

  6. Compositional Evolution of Pyrochlore-Group Minerals in Carbonatites of the Belaya Zima Pluton, Eastern Sayan

    Science.gov (United States)

    Khromova, E. A.; Doroshkevich, A. G.; Sharygin, V. V.; Izbrodin, L. A.

    2017-12-01

    Pyrochlore-group minerals are the main concentrators of niobium in carbonatites of the Belaya Zima alkaline pluton. Fluorcalciopyrochlore, kenopyrochlore and hydropyrochlore were identified in chemical composition. Their main characteristics are given: compositional variation, morphology, and zoning. During evolution from early calcite to late ankerite carbonatites, the UO2, TiO2, REE, and Y contents gradually increased. All carbonatite types are suggested to contain initial fluorcalciopyrochlore. However, in calcite-dolomite and ankerite carbonatites, it is partially or completely hydrated due to hydrothermal processes at the late stage of the pluton. This hydration resulted in the appearance of kenopyrochlore and hydropyrochlore due to removal of Ca, Na and F, and input of Ba, H2O, K, Si, Fe, and probably U and REE. At the last stage of the pluton, this hydrated pyrochlore was replaced by Fe-bearing columbite.

  7. Use of olivine and plagioclase saturation surfaces for the petrogenetic modeling of recrystallized basic plutonic systems

    Science.gov (United States)

    Hanson, G. N.

    1983-01-01

    During petrogenetic studies of basic plutonic rocks, there are at least three major questions to be considered: (1) what were the relative proportions of cumulate crystals and intercumulus melt in a given sample? (2) what is the composition and variation in composition of the melts within the pluton? and (3) what is the original composition of the liquids, their source and evolution prior to the time of emplacement? Use of both saturation surfaces can place strong limits on the compositions of potential cumulate phases and intercumulus melts. Consideration of appropriate trace elements can indicate whether a sample is an orthocumulate, adcumulate or mesocumulate. Thus, when trace element and petrographic data are considered together with the saturation surfaces, it should be possible to begin to answer the three major questions given above, even for strongly recrystallized basic plutons.

  8. U-Pb and Rb-Sr geochronology of the Wedgeport granitoid pluton, southwestern Nova Scotia

    International Nuclear Information System (INIS)

    Cormier, R.F.; Keppie, J.D.; Odom, A.L.

    1988-01-01

    Zircons from biotite monzogranite of the Wedgeport Pluton, intrusive into deformed metasediments of the Cambrian(?) Goldenville formation in the southwestern Meguma Terrane of Nova Scotia, yield concordant U-Pb ages of 316 ± 5 Ma. This is interpreted as the time of intrusion and crystallization. Within the error limits, the 323 ± 0.0056 Rb-Sr analyses of mineral separates of biotite, potassium feldspar, and quartz-plagioclase from several samples yield subparallel, internal isochrons with an average age of 257 ± 8 Ma. Initial ratios of the internal isochrons range from 0.716 to 0.759. A slow-cooling model for the latter data is discarded because the mineral data fall on straight lines. Instead, a reheating event related to plutonism ca 257 Ma ago, which was sufficient to cause local grain-to-grain migration and reequilibration of strontium and rubidium but not large-scale redistribution, is invoked. This reheating is also inferred to be responsible for the hydrothermal alteration and Sn-U mineralization concentrated along the northwestern margin of the pluton. A dextral northeast-southeast shear zone cutting the pluton is also inferred to be ca. 257 Ma old. It may be related to the last stages of westward abduction of the Meguma Terrane. These results provide a clear example of Permo-Carboniferous plutonism in the southwestern Meguma Terrane and suggest a similar interpretation may apply to other anomalously young ages recorded in this area. In light of these results, the Permo-Carboniferous age of the large East Kemptville tin deposit and its location in a dextral shear zone suggest that the association of younger plutonism and shear zones may be a significant factor for economic mineralization. (22 refs., 4 tabs., 3 figs.)

  9. Reconnaissance study of the uranium and thorium contents of plutonic rocks of the southwestern Seward Peninsula, Alaska

    International Nuclear Information System (INIS)

    Miller, T.P.; Bunker, C.M.

    1976-01-01

    Large granitic Cretaceous plutons are exposed along and adjacent to an arcuate belt of igneous and high-grade metamorphic rocks in the southeastern Seward Peninsula of Alaska. Reconnaissance studies of these plutons have shown that the Darby pluton has well above average amounts of uranium and thorium (11.2 ppm and 58.7 ppm, respectively), the Kachauik pluton contains average to above average uranium and thorium (5.7 ppm and 22.5 ppm, respectively), and the Bendeleben pluton contains average amounts of uranium and thorium (3.4 ppm and 16.7 ppm, respectively). The three plutons show compositional and textural differences indicative of different source materials that may have controlled the distribution of uranium and thorium. The high uranium and thorium contents of the Darby pluton, similar to those of the Conway Granite of New Hampshire which has been mentioned as a possible low-grade thorium resource, suggest that this pluton may be a favorable area for economic concentrations of uranium and thorium

  10. Evidence for a close phylogenetic relationship between Melissococcus pluton, the causative agent of European foulbrood disease, and the genus Enterococcus.

    Science.gov (United States)

    Cai, J; Collins, M D

    1994-04-01

    The 16S rRNA gene sequence of Melissococcus pluton, the causative agent of European foulbrood disease, was determined in order to investigate the phylogenetic relationships between this organism and other low-G + C-content gram-positive bacteria. A comparative sequence analysis revealed that M. pluton is a close phylogenetic relative of the genus Enterococcus.

  11. Granitoid emplacement during syn-convergent transtension: An example from the Huamenlou pluton in North Qinling, central China

    Directory of Open Access Journals (Sweden)

    Yang Li

    2018-01-01

    Full Text Available The Huamenlou pluton, is an elongated granite intrusion with high aspect ratio, emplaced within the southern margin of the North Qinling (central China. Here we investigate this pluton through multiple techniques including the fabric study, microstructural observation and zircon geochronology. Our zircon U–Pb data confirm that the granite crystallized at ca. 462 Ma which is consistent with the ages of other linear plutons in North Qinling. Microstructural observations of the Huamenlou granites illustrate that the pluton has undergone superimposed deformation during its emplacement, from magmatic to high-temperature solid state conditions. The internal fabric obtained by anisotropy of magnetic susceptibility (AMS and shape preferred orientation (SPO show similar results. The fabrics are relatively concordant and generally vary from NE–SW to NEE–SWW which are roughly oblique to the trend of the pluton elongation and the regional structures. Meanwhile, scalar parameters reflect two completely different strain regimes for the pluton and its host rocks, i.e., the fabrics within host rocks are mainly oblate while the central part of the intrusion displays mainly prolate fabrics. It is inferred that the structural pattern recorded in this pluton was caused by local dextral transtension in consequence of oblique convergence between the South and North China Blocks. We propose that the local transtension in convergence setting probably evolved from vertical extrusion tectonics that provided room for the magma emplacement and imparted prolate fabrics in the Huamenlou pluton.

  12. Plataformas de datos abiertos: disponibilidad de mercado

    Directory of Open Access Journals (Sweden)

    Viena Muirragui Irrazábal

    2016-12-01

    Full Text Available El documento presenta las oportunidades que dentro del contexto de disponibilidad de mercado existen para el uso de las plataformas open data, ya que no todas las organizaciones tienen recursos propios que sean suficientes para implantar sus plataformas desde una base inicial, siendo por lo tanto necesario requerir aquellas que han sido desarrolladas por empresas expertas en ello; si se considera tomar ésta opción tendrían a resolver el proceso, sin embargo podría constituirse en una pérdida de capacidad de llegar a personalizar y adecuar integralmente la plataforma a las necesidades especificas de la organización que las requiera. Tomando en consideración lo expuesto, en este artículo de revisión se detallan características con las que cuentan  algunas de las plataformas consideradas principales por su aplicabilidad que están disponibles en el mercado, sea a través de un modelo de software gratuito o libre y, también,  con licencia comercial, en otros casos. Los datos que han sido considerados para este análisis se los referencia con respecto a la información que los propios proveedores han proporcionado por medio de documentación que se encuentra publicada por ellos  en la web, como también se ha considerado la experiencia con versiones trial y ejemplos utilizables de manera abierta.   Abstract   The paper presents the opportunities within the context of market availability exist for the use of open data platforms, since not all organizations have their own resources which are sufficient to implement their platforms from an initial base, being therefore necessary to require those that have been developed by expert companies in it; considering taking this option would solve the process, however it could become a loss of ability to reach fully customize and adapt the platform to the specific needs of the organization that requires them. Considering the above, in this review article features are detailed with that feature

  13. Las palmeras en los mercados de Iquitos

    Directory of Open Access Journals (Sweden)

    1992-01-01

    Full Text Available LES PALMIERS SUR LES MARCHES D’IQUITOS. Les produits végétaux vendus sur les marchés d’Iquitos ont été inventoriés durant les 20 derniers mois. Ils appartiennent à 19 espèces distribuées en 11 genres. Un grand nombre d’espèces fournissent des fruits (16, alors que peu d’espèces produisent des coeurs (1, des fibres (2, des feuilles (1, de l’huile (1, des larves d’insectes comestibles (2. Les palmiers représentent 26 % des espèces commercialisées pour leur fruit. Un calendrier des périodes de vente est donné pour chaque produit. En el transcurso de los últimos 20 meses se han realizado inventarios sistematizados de la diversidad de los vegetales que se comercializan en los mercados de Iquitos. Se encontró que se comercializan productos en un total de 19 especies y 11 géneros de palmeras entre éstos se encuentran frutos (16 especies, palmito (1 especie, fibras (2 especies, hojas (1 especie, aceite (1 especie, y larvas comestibles de insectos que crecen en los estípites de dos especies. Las palmeras representan el 26 % de plantas comercializadas por el fruto en los mercados de dicha ciudad. Se propone también para cada especie un calendario de las épocas de mayor venta. PALMS IN THE MARKETS OF IQUITOS. Diversity of plants products on Iquitos markets has been studied for the last 20 months. Products from 19 species in 11 genera have been found. Edible fruits are provided from many species (16, while palm heart, fiber, leaves, medicine, oil, and Coleoptera larvae are obtained from 1 to 2 species. Palms represent 26 % of the 62 edible fruit species sold in the markets. A calendar of sale periods is proposed for each product and species.

  14. O mercado voluntário de carbono

    OpenAIRE

    Silva, Carlos Filipe Araújo da

    2012-01-01

    O objecto desta dissertação é caracterizar, em termos económicos, o problema que está subjacente à instituição dos mercados das licenças de carbono e a natureza económica deste tipo de solução para esse problema, dando-se, depois, uma atenção especial ao Mercado Voluntário. Para este tipo de mercado descreve-se o seu funcionamento e apresenta-se um projecto elaborado para uma federação de organizações de produtores florestais que poderia ser submetido a esse tipo de mercado....

  15. ARTESANATO: ENTRE PATRIMÔNIO E MERCADO

    Directory of Open Access Journals (Sweden)

    Miriel Bilhalva Herrmann

    2016-12-01

    Full Text Available O presente trabalho busca estabelecer uma analise em relação a questão do artesanato, de como sofre modificações e interferências . Na qual no seu inicio tinha apenas valor utilitário, pois era produzido para suprir necessidades humanas. E com a revolução industrial foi relegada a marginalização, assim perdeu seu espaço para as máquinas. Mas logo com o intuito de criar identidades nacionais, começam as discussões em relação ao patrimônio. Dessa forma as concepções e ampliação sobre o seu conceito, propiciou grande valorização das diversidades culturais, assim como as técnicas artesanais. E a partir disso o artesanato passa a ser percebido como patrimônio, sendo visto e utilizado pelo turismo como fator de desenvolvimento econômico, dessa forma ocasionando um dilema entre estas técnicas artesanais de como se manter tradicionais, referência para a cultura e a identidade cultural. Ao mesmo tempo atender as necessidades do consumidor que se apresenta como turista, pois necessitam se adaptar para continuar sobrevivendo as mudanças do mercado

  16. O mercado das escolas de estilismo

    Directory of Open Access Journals (Sweden)

    Nicolas Divert

    2012-03-01

    Full Text Available Em cem anos, o número de franceses trabalhando na moda diminuiu em 93%, o que acarretou uma modificação da estrutura da mão de obra empregada nesse setor. Perante a internacionalização crescente da economia, os países ocidentais tendem a dar as costas às atividades de produção para se concentrar nos ofícios com alto valor agregado. Entre eles, as atividades relacionadas à criação, realizadas pelos estilistas, estão em forte crescimento. Longe de estar à margem deste movimento, a escola acompanhou o deslocamento em direção a níveis mais elevados de escolaridade observados nos empregos propostos. A partir dos anos de 1970, cursos especializados na criação de moda começaram a ser criados. Inicialmente confiada à iniciativa pública, a oferta de formação foi crescendo, impulsionada por escolas privadas sem vínculos com o Estado. Um mercado da certificação escolar se configurou, no qual essas escolas tentam mostrar, em salões do estudante, uma relação estreita entre formação e emprego.

  17. Thermal modification of hematite-ilmenite intergrowths in the Ecstall pluton, British Columbia, Canada

    DEFF Research Database (Denmark)

    Brownlee, S.J.; Feinberg, J.M.; Harrison, R.J.

    2010-01-01

    In this study, we examine the effects of reheating on finely exsolved hematite-ilmenite intergrowths from the similar to 91 Ma Ecstall pluton using reflected light microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). As a result of the emplacement of the you......In this study, we examine the effects of reheating on finely exsolved hematite-ilmenite intergrowths from the similar to 91 Ma Ecstall pluton using reflected light microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). As a result of the emplacement...... of the younger adjacent similar to 52 Ma Quottoon pluton, samples closer to a thermal boundary have experienced greater degrees of thermal alteration. Five main microstructural features characterize hematite-ilmenite intergrowths from the Ecstall: (I) exsolution lamellae of hematite and ilmenite; (II) oxidation....... Higher temperatures also enhanced oxidation in ilmenite. The formation of magnetite altered the bulk magnetic properties of these samples, increasing NRM intensity. This study underscores the need to consider a pluton's post-emplacement thermal history before making tectonic interpretations based...

  18. Contribution to the radioactivity of Um Ara granitic pluton, south-eastern desert, Egypt

    International Nuclear Information System (INIS)

    El Reedy, M.W.; Kamel, A.F.; Mansour, S.E.I.

    1988-01-01

    Um Ara area lies in the southern part of the eastern desert between latitudes 22 0 30' and 22 0 41'N and longitudes 33 0 46' and 33 0 54'E. Several types of granitic varieties ranging from high silica granite (SiO 2 >75%) to low silica granite (SiO 2 68-70%) occur in Um Ara granitic pluton. Surface samples were collected from the high anomalous locations in the pluton together with trenches samples (about 50cm in depth). The U content in the surface samples ranges from 69 to 7 ppm while in trenches samples, it ranges from 38 to 759 ppm. The thorium content on the other hand ranges from 34 to 402 ppm in surface samples and from 158 to 316 ppm in trenches samples. Some samples show no Th contents. The Th/U ratios ranges from 0.065 to 3.137 in surface samples and from 0.386 to 2.590 in trenches samples. An enrichment of U content is the main feature characterising this granitic pluton, it is mainly connected with the fractured zones. Uranium is mostly present as secondary U mineralization accompanied by Fe, Mn and to some extent by carbonate materials. A hydrothermal origin could be considered for this U mineralization in the pluton. Primary U mineralization (pitchblende) together with secondary mineralization was observed in some locations in the area disseminated in the granite, this reflects the syngenetic origin of this granitic type

  19. The Fontaine Pluton : an early Ross Orogeny calc-alkaline gabbro from southern Victoria Land, Antarctica

    International Nuclear Information System (INIS)

    Cottle, J.M.; Cooper, A.F.

    2006-01-01

    The Fontaine Pluton is a previously undescribed mafic intrusion outcropping at Fontaine Bluff on the south side of the Carlyon Glacier in southern Victoria Land, Antarctica. It is the southern-most member of a laterally extensive mafic suite emplaced at mid-crustal depths during the initial stages of the Ross Orogeny. The pluton comprises recrystallised hornblende-biotite gabbro, which in places shows well-defined centimetre to metre scale primary igneous layering. Recrystallised ultramafic enclaves composed of amphibole-chlorite-talc are inferred to be remnants of a chemically and mineralogically distinct cumulate fraction. The intrusion has a 87 Sr/ 86 Sr (i) ratio of 0.70679 and a 143 Nd/ 144 Nd (i) ratio of 0.51187 (εNd (i) = -1.2). This, coupled with other geochemical data, implies that the Fontaine Pluton was formed by c. 15% partial melting of a depleted mantle source that was subsequently contaminated by continental crust. Preliminary U-Pb geochronology on zircon suggests an emplacement age for the pluton of 546 ± 10 Ma. These new data indicate that Ross Orogeny magmatism in this area of southern Victoria Land was initiated in the late Neoproterozoic along a subducting plate margin. (author). 55 refs., 10 figs., 3 tabs

  20. Geochemical constraints on the link between volcanism and plutonism at the Yunshan caldera complex, SE China

    Science.gov (United States)

    Yan, Lili; He, Zhenyu; Beier, Christoph; Klemd, Reiner

    2018-01-01

    The Yunshan caldera complex is part of a larger scale, ca. 2000-km-long volcanic-plutonic complex belt in the coastal region of SE China. The volcanic rocks in the caldera complex are characterized by high-silica peraluminous and peralkaline rhyolites associated with an intracaldera porphyritic quartz monzonite pluton. In this study, we present zircon U-Pb, Hf and stable O isotopes along with geochemical data of both volcanic and plutonic rocks to evaluate the potential petrogenetic link between volcanism and plutonism in the Yunshan caldera complex. SHRIMP zircon U-Pb geochronology of both volcanic and plutonic rocks yields almost identical ages ranging from 95.6 to 93.1 Ma. The peraluminous and peralkaline rhyolites show negative anomalies of Sr, P, Ti and Ba and to a lesser extent negative Nb and Ta anomalies, along with positive Rb anomalies and `seagull-like' rare earth element (REE) patterns with negative Eu anomalies and low (La/Yb)N ratios. The intracaldera porphyritic quartz monzonite displays minor negative Rb, Nb, Ta, Sr, P and Ti anomalies and a positive Ba anomaly with REE patterns characterized by relatively high (La/Yb)N ratios and lack significant Eu anomalies. The peraluminous and peralkaline rhyolites and the porphyritic quartz monzonite exhibit consistent ɛ Nd( t) of - 3.7 to - 2.2 and display zircon ɛ Hf( t) values of - 2.1 to 3.7. They further have similar, mantle-like, zircon oxygen isotopic compositions (δ18OVSMOW mainly = 4.63 to 5.76‰). We interpret these observations to be in agreement with a crystal mush model in which the parental magma of the volcanic and plutonic rocks of the Yunshan caldera complex was likely produced by interaction of asthenosphere melts with subduction-influenced enriched mantle wedge. The peralkaline rhyolites are interpreted to represent the most differentiated magma that has subsequently experienced significant fluid-melt interactions, whereas the porphyritic quartz monzonite may be representative of the

  1. Quantifying the Plutonic to Volcanic Relationship Along the Puna Plateau: Implications for Cordilleran Plateau Evolution

    Science.gov (United States)

    Ward, K. M.; Delph, J. R.; Zandt, G.; Beck, S. L.; Ducea, M. N.

    2016-12-01

    Quantifying well constrained plutonic to volcanic (P:V) ratios is inherently difficult because the tectonic processes that exhume intrusive bodies rarely preserve their extrusive equivalents. Conversely, active magmatic systems that have well-preserved volcanic deposits require sophisticated geophysical or geochemical approaches to estimate their plutonic roots and even when these sophisticated approaches are available, it is not always clear what constitutes a plutonic volume. Further complicating the enigmatic plutonic to volcanic relationship is the highly episodic nature of pluton emplacement where magmatic flare-ups produce several orders of magnitude more magmatism when compared against magmatic lulls. Despite this inherent difficulty, a growing body of independently measured P:V ratios (e.g. seismic tomography, geomorphic modeling, geological mapping/dating, and Zircon age spectra modeling) suggests the contribution of magmatic addition as an uplift mechanism in Cordilleran systems is much larger than is currently accepted. However, it remains unclear if these studies can be generalized to represent type behavior in Cordilleran systems or result from the non-uniform sampling imposed by the ability to measure large P:V ratios in only a few select and potentially anomalous regions of the American Cordillera. To better examine the role of magmatic processes in building Cordilleran high plateaus, we image the crustal seismic shear-wave velocity for an 800 km section (20.5°-28°S) of the active South American Cordillera (Puna Plateau). When placed in the context of existing geological and geophysical datasets, our seismic model reveals numerous mid-crustal low-velocity zones that we unambiguously interpret as the plutonic underpinnings associated with the voluminous silicic volcanics of the Puna Plateau. These larger P:V ratios are consistent with recent thermomechanical modeling of granitic magma intrusions that support the existence of long-lived, partially

  2. Geographically diverse Australian isolates of Melissococcus pluton exhibit minimal genotypic diversity by restriction endonuclease analysis.

    Science.gov (United States)

    Djordjevic, S P; Smith, L A; Forbes, W A; Hornitzky, M A

    1999-04-15

    Melissococcus pluton, the causative agent of European foulbrood is an economically significant disease of honey bees (Apis mellifera) across most regions of the world and is prevalent throughout most states of Australia. 49 Isolates of M. pluton recovered from diseased colonies or honey samples in New South Wales, Queensland, South Australia, Tasmania and Victoria were compared using SDS-PAGE, Western immunoblotting and restriction endonuclease analyses. DNA profiles of all 49 geographically diverse isolates showed remarkably similar AluI profiles although four isolates (one each from Queensland, South Australia, New South Wales and Victoria) displayed minor profile variations compared to AluI patterns of all other isolates. DNA from a subset of the 49 Australian and three isolates from the United Kingdom were digested separately with the restriction endonucleases CfoI, RsaI and DraI. Restriction endonuclease fragment patterns generated using these enzymes were also similar although minor variations were noted. SDS-PAGE of whole cell proteins from 13 of the 49 isolates from different states of Australia, including the four isolates which displayed minor profile variations (AluI) produced indistinguishable patterns. Major immunoreactive proteins of approximate molecular masses of 21, 24, 28, 30, 36, 40, 44, 56, 60, 71, 79 and 95 kDa were observed in immunoblots of whole cell lysates of 22 of the 49 isolates and reacted with rabbit hyperimmune antibodies raised against M. pluton whole cells. Neither SDS-PAGE or immunoblotting was capable of distinguishing differences between geographically diverse isolates of M. pluton. Collectively these data confirm that Australian isolates of M. pluton are genetically homogeneous and that this species may be clonal. Plasmid DNA was not detected in whole cell DNA profiles of any isolate resolved using agarose gel electrophoresis.

  3. Potassium, rubidium, strontium, thorium and uranium of the cretaceous plutons in the Kitakami Mountains

    International Nuclear Information System (INIS)

    Katada, Masato; Kanaya, Hiroshi.

    1980-01-01

    The Cretaceous plutonic rocks in the Kitakami Mountains, 110 to 125 Ma in K-Ar ages on biotite, etc., can be petrographically and petrochemically classified into seven groups; Zones I, II, III, IV, V, VIa and VIb. Some of them are arranged in the east to west direction. The plutons of Zones II and V are mainly felsic. They are of comparatively big dimension reaching 600 square kilometers. The plutons of other zones are composed of felsic and mafic rocks. They occur on a small scale. The plutonic rocks have been chemically analysed for CaO, K 2 O, Rb, Sr, Th, and U. In the mafic rocks of CaO > 8.2 percent, the contents of CaO and Na 2 O are nearly equal in each zone throughout the Kitakami Mountains. K 2 O, Rb, Th, and U contents, however, generally increase westward. Sr also does. In the westernmost zone, Zone IV, the mafic rocks resemble shoshonite concerning their major elements. Some of the plutons, especially in Zones II and V, are zonally divided into marginal and central facies. The two facies are different in their K 2 O, Rb, etc. contents, and K/Rb and other ratios. In the marginal facies K 2 O and Rb are richer and K/Rb is smaller than those in the central facies. This fact suggests the different processes of magmatic differentiation in the two facies. Intrusion of the marginal facies have successively followed by that of the central facies. (author)

  4. Subsurface profiling of granite pluton using microtremor method: southern Aravalli, Gujarat, India

    Science.gov (United States)

    Joshi, Aditya U.; Sant, Dhananjay A.; Parvez, Imtiyaz A.; Rangarajan, Govindan; Limaye, Manoj A.; Mukherjee, Soumyajit; Charola, Mitesh J.; Bhatt, Meghnath N.; Mistry, Sagar P.

    2018-01-01

    We report, using the microtremor method, a subsurface granitic pluton underneath the Narukot Dome and in its western extension along a WNW profile, in proximity of eastern fringe of Cambay Rift, India. The dome and its extension is a part of the Champaner Group of rocks belonging to the Mesoproterozoic Aravalli Supergroup. The present finding elucidates development of an asymmetric double plunge along Narukot Dome. Microtremor measurements at 32 sites were carried out along the axial trace (N95°) of the dome. Fourier amplitude spectral studies were applied to obtain the ratio between the horizontal and vertical components of persisting Rayleigh waves as local ambient noise. Fundamental resonant frequencies with amplitude ≥1-sigma for each site are considered to distinguish rheological boundary. Two distinct rheological boundaries are identified based on frequency ranges determined in the terrain: (1) 0.2219-10.364 Hz recorded at 31 stations identified as the Champaner metasediment and granite boundary, and (2) 10.902-27.1119 Hz recorded at 22 stations identified as the phyllite and quartzite boundary. The proposed equation describing frequency-depth relationship between granite and overlaying regolith matches with those already published in the literature. The morphology of granite pluton highlights the rootless character of Champaner Group showing sharp discordance with granitic pluton. The findings of manifestation of pluton at a shallower depth imply a steep easterly plunge within the Champaner metasediments, whereas signature of pluton at a deeper level implies a gentle westerly plunge. The present method enables to assess how granite emplacement influences the surface structure.

  5. Gobernanza climática: Actores sociales en la mitigación y adaptación en el estado de Coahuila, México

    Directory of Open Access Journals (Sweden)

    Gustavo Córdova Bojórquez

    2015-01-01

    Full Text Available Se presenta una evaluación de las capacidades de actores sociales de Coahuila de Zaragoza para enfrentar el cambio climático a partir de tres indicadores: 1 Social, con base en experiencias y prácticas de los actores; 2 Político, se refiere al diálogo y la legitimación del proceso político de los actores, y 3 Ambiental, con base en acciones de sustenta - bilidad ambiental. Los resultados indican que en materia social persiste la vulnerabilidad; en materia política, hay instituciones con acciones para enfrentar el cambio climático, pero sin acciones de consenso entre los actores y sectores; en materia ambiental, la agenda verde aparece avanzada, no así las agendas azul y gris las cuales deben reforzar los procesos de gobernanza para lograr anticiparse a los efectos del cambio climático por medio del incremento de medidas de mitigación y adap - tación a partir de instrumentos de gestión pública como el Programa Estatal de Cambio Climático.

  6. Helminth parasites of freshwater fishes from Cuatro Ciénegas, Coahuila, in the Chihuahuan Desert of Mexico: inventory and biogeographical implications.

    Science.gov (United States)

    Aguilar-Aguilar, Rogelio; Martínez-Aquino, Andrés; Espinosa-Pérez, Héctor; Pérez-Ponce de León, Gerardo

    2014-06-01

    As part of an ongoing inventory of the helminth parasites of freshwater fishes in Mexico, 570 individual fish were collected between Apr 2008 and Oct 2011 in 26 localities along the Cuatro Ciénegas region in Coahuila State, northern Mexico. Seventeen species of hosts, mostly corresponding to Nearctic freshwater elements, were studied. A total of 8324 individual worms were collected during this survey, representing 25 species of helminths, of which 9 were digeneans, 3 monogeneans, 3 acanthocephalans, 9 nematodes and 1 cestode. Most of the records in this checklist represent new host or locality records. The information provided in this checklist may be helpful for our understanding of the biodiversity and historical biogeography of this host-parasite system, because in the Cuatro Ciénegas region occur a Nearctic freshwater fish fauna, along with Neotropical and endemic elements, and from a biogeographical point of view, this may represent a transitional area. © 2013 International Society of Zoological Sciences, Institute of Zoology/Chinese Academy of Sciences and Wiley Publishing Asia Pty Ltd.

  7. Witch-Hunting in Coahuila, 1748-51. “De Villa de villa, sin Dios ni Santa María”

    Directory of Open Access Journals (Sweden)

    Lara Semboloni

    2004-10-01

    Full Text Available By reviewing the myths of witchcraft and sorcery, this paper analyzes the actors and social practices in a frontier  town, the last bulwark  before  total  wilderness,  in  the  Northern state of Coahuila,  Mexico. The author  studies the process of Inquisition during  1748-1751, a period  when  people  were accused of and tried  for diabolic  activities. The trials reveal a tendency  to explain the  game of human  passions  within  an unknown reality —characterized  by   an   apparent   lack   of   logic   and   formal canons—  through supernatural activities  and  satanic  pacts  atributed to  women,  regardless  of social class. In  this  context, moral  —and  political—  authorities  tried  to  stop  promiscuity, and their actions were seen as a need and determination to control a very fluid social structure,  i.e., to establish norms  for the regulation of moral standards  and collective values.

  8. Impactos socioambientales de la gestión del agua en el área natural protegida de Cuatro Ciénegas, Coahuila

    Directory of Open Access Journals (Sweden)

    Sandra Eloisa Ortiz Acosta

    2016-01-01

    Full Text Available El área natural protegida Cuatro Ciénegas, Coahuila, posee un ecosistema desértico valioso, con endemismos y humedales Ramsar, que ha resultado perjudicado por las ac- tividades económicas no reguladas, como la agricultura y el turismo. Las acciones de gestión implementadas por la Comisión Nacional de Áreas Naturales Protegidas y la Comi- sión Nacional del Agua también han tenido repercusiones socioambientales. Por ello, el objetivo del presente trabajo es analizar los impactos sociales y ambientales derivados de la gestión del agua en esta área natural protegida, a través de la aplicación de entrevistas semiestructuradas a actores clave. La información se analizó mediante una adaptación a la metodología de la teoría fundamentada. A partir de los resultados, se concluyó que los daños socioambientales se deben a que las instituciones no han logrado compatibilizar las políticas de conservación con las de aprovechamiento sustentable de los recursos naturales, lo que contribuye al deterioro del ecosistema y a la inconformidad de la población.

  9. Age and depositional conditions of the marine vertebrate concentration Lagerstätte at Gomez Farías, southern Coahuila, Mexico

    Science.gov (United States)

    Zell, Patrick; Beckmann, Seija; Stinnesbeck, Wolfgang

    2014-12-01

    A 1.5 m thick coquinite discovered in the Upper Jurassic La Casita Formation of the Sierra El Jabalà near Gomez Farías, Coahuila, northeastern Mexico qualifies as a concentration Lagerstâtte owing to its richness in marine vertebrates. Ichthyosaurs, pliosaurs and crocodilians were described to some detail, but other taxa remained unstudied and the precise biostratigraphical age, as well as paleoecological conditions that led to the formation of the fossil deposit, are not known in detail. Here we describe ammonites, aptychi, bivalves and radiolarians, which allow for a stratigraphic assignation of the deposit to the uppermost Kimmeridgian Beckeri Zone. The unit under consideration accumulated in a hemipelagic mud bottom environment during a period of time characterized by low oxygen conditions, while a short term benthic colonization phase near the top of the coquinite corresponds to increased oxygen availability. A combination of upwelling, bottom currents, winnowing, offshore winds, storm events, circulatory nutrient traps, low oxygenated bottom waters, and a transgressional regime with reduced net sedimentation was crucial factors for the subsequent concentration of fossils, as well as for marine phosphate generation and phosphorus migration.

  10. U-Pb zircon dating of the Bassies granite (Pyrenees): a syn-tectonic pluton of Westphalian age

    International Nuclear Information System (INIS)

    Paquette, J.L.

    1997-01-01

    A new U-Pb zircon age of 312 ± 2 Ma for the Bassies pluton (Pyrenees) contradicts the previous whole-rock Rb-Sr dating at 276 ± 16 Ma, which was considered as the age of emplacement, therefore regarded as post-tectonic. The new date is in agreement with recent structural studies which suggest a Hercynian syn-tectonic emplacement for the Bassies pluton. These results strengthen the few U-Pb ages already published for the Pyrenean granites and indicate that the Hercynian plutonism of the Pyrenees is essentially Carboniferous in age and syn-tectonic. (authors)

  11. Amphibole Thermometry and a Comparison of Results from Plutonic and Volcanic Systems

    Science.gov (United States)

    Sherman, T. M.; Putirka, K. D.; De Los Reyes, A. M. A.; Ratschbacher, B. C.

    2015-12-01

    Recent work (Ridolfi and Renzulli 2014) shows that amphiboles can be used to infer magmatic temperatures, even without knowledge of co-existing liquids. Here, we apply this approach, using new calibrations, to investigate felsic-mafic magma interactions, in a volcanic (Lassen Volcanic Center, a Cascade volcano) and plutonic (the Jurassic Guadalupe Igneous Complex) system. Preliminary data suggest that volcanic processes, as might be expected, preserve higher temperatures than plutonic materials (on average, volcanic amphiboles recorded 907±57.3°C while plutonic amphiboles recorded 764±59.7°C). We also find that the average T of a given mineral grain decreases with increased mineral size such that those crystallized below 800°C sometimes reach sizes beyond ~1mm, while those near 900°C appear truncated to ~0.3mm. It is not clear if T is the only control on amphibole crystal growth; however, our results would imply that larger grains not only require more time to grow but require continued undercooling. Significant cooling or heating is also recorded in many volcanically- and plutonically-grown grains, which may reflect transitioning between magmas of different T and composition. Core-to-rim cooling trends (with a common T of drop of 80oC) likely represent mafic-to-felsic magma transitions, whereas core-to-rim heating of similar magnitudes indicate a felsic-mafic transition. Some grains, though, exhibit a constant T (in the range 700-900°C) from core to rim, which perhaps indicates some shielding from magma mixing processes. Amphiboles might thus provide a reliable record of the intensity of magma mingling and mixing experienced by any particular enclave. Interestingly, volcanically-derived amphiboles appear to mostly record cooling towards the rims, while their plutonic counterparts tend to experience heating. It would thus appear that at Lassen, amphiboles are unaffected by later mafic magma recharge, but at the GIC, the plutonic amphiboles are more likely to

  12. Geology of the plutonic basement rocks of Stewart Island, New Zealand

    International Nuclear Information System (INIS)

    Allibone, A.H.; Tulloch, A.J.

    2004-01-01

    Exposures of basement rocks on Stewart Island provide a c. 70 km long by 50 km wide map of part of the Median Batholith that spans the margin of the Western Province. Because of their distance from the present plate boundary, these rocks are relatively unaffected by Cenozoic tectonism, allowing examination of unmodified Carboniferous-Cretaceous relationships within the Median Batholith. Thirty individual plutons (>c.20 km 2 ) have been mapped along with numerous relatively small intrusions ( 2 ). The large plutons form 85-90% of the Median Batholith on Stewart Island while the many smaller intrusions comprise 10-15%, mostly in the north. Lithologies include: biotite ± minor hornblende granodiorite, granite and leucogranite with accessory titanite - magmatic epidote and allanite (c. 50%); biotite ± muscovite ± garnet granite with S-type affinities (c. 10%); alkaline quartz monzonite, granite, and alkali feldspar granite with rare aegirine and blue-green amphibole (c. 3%); quartz monzodiorite and diorite with hornblende > biotite (c. 23%); gabbro and anorthosite (c. 12%) and ultramafic rocks (c. 2%). U-Pb zircon and monazite dating indicates that c. 12% of these plutonic rocks were emplaced during the Carboniferous between 345 and 290 Ma, c. 20% in the Early-Middle Jurassic at c. 170-165 Ma, c. 30% in the latest Jurassic to earliest Cretaceous between 152 and 128 Ma, and c. 38% in the Early Cretaceous between 128 and 100 Ma. The distribution of Pegasus Group schists and peraluminous granitoid rocks indicates that the northern limit of extensive early Paleozoic Western Province basement is located either within the Gutter Shear Zone or at the Escarpment Fault, 10-15 km south of the Freshwater Fault System previously thought to mark this boundary. Carboniferous and Middle Jurassic magmatism extended plutonic basement northwards as far as the Freshwater Fault System, while further magmatism during the latest Jurassic and earliest Cretaceous produced the basement

  13. The rapakivi granite plutons of Bodom and Obbnäs, southern Finland: petrography and geochemistry

    Directory of Open Access Journals (Sweden)

    Kosunen, P.

    1999-12-01

    Full Text Available The Obbnäs and Bodom granite plutons of southernmost Finland show the typical petrographic and geochemical features of the Proterozoic rapakivi granites in Finland and elsewhere: they cut sharply across the 1900 Ma Svecofennian metamorphic bedrock and have the geochemical characteristics of subalkaline A-type granites. The Bodom pluton is composed of porphyritic granites (hornblende-, hornblende-biotite-, and biotite-bearing varieties and an even-grained granite that probably represent two separate intrusive phases. This lithologic variation does not occur in the Obbnäs pluton, which is almost entirely composed of porphyritic hornblende-biotite granite that gradually becomes more mafic to the southwest. Three types of hybrid granitoids resulting from magma mingling and mixing occur on the southwestern tip of the Obbnäs peninsula. The Bodom granites are syenogranites, whereas the composition of the Obbnäs granite varies from syeno- to monzogranite. The main silicates of both the Bodom and Obbnäs granites are quartz, microcline, plagioclase (An1541, biotite (siderophyllite, and generally also amphibole (ferropargasite or hastingsite. Plagioclase-mantled alkali feldspar megacrysts are absent or rare. The accessory minerals are fluorite, allanite, zircon, apatite, and iron-titanium oxides; the Obbnäs granite also contains titanite. The Bodom and Obbnäs granites are metaluminous to weakly peraluminous, with average A/CNK of 1.00 and 1.05, respectively, have high Fe/Mg (average FeOtot/[FeOtot+MgO] is 0.94 for the Bodom and 0.87 for the Obbnäs granites, and high Ga/Al (3.78 to 5.22 in Bodom and 2.46 to 4.18 in Obbnäs. The REE contents are high with LREE-enriched chondrite-normalized patterns and moderate (Obbnäs to relatively strong (Bodom negative Eu-anomalies. The Obbnäs granite is enriched in CaO, TiO2, MgO, and FeO, and depleted in SiO2 and K2O compared to the Bodom granites. Also, there are differences in the Ba, Rb, and Sr contents of

  14. México en el mercado internacional de aguacate

    Directory of Open Access Journals (Sweden)

    Alejandro Macías Macías

    2011-01-01

    Full Text Available El mercado internacional de aguacate ha sufrido importantes modificaciones durante las dos últimas décadas. Por un lado, aunque se trata de una fruta exótica, cada vez es más consumida en el mundo Por otro, surgen nuevas potencias exportadoras que desplazan a anteriores naciones líderes: México, principal productor y consumidor de la fruta, es, a partir de la década de 1990, en el máximo exportador, como resultado de la apertura del mercado de los Estados Unidos. Al mismo tiempo, países sudamericanos como Chile y Perú, cada vez tienen mayor presencia en el mercado europeo, desplazando relativamente a Israel, Sudáfrica, España, Kenia o Ecuador. Finalmente, se emergen nuevos vendedores como Australia o se reafirman otros como República Dominicana.

  15. Estado, mercado de tierra urbana e inundaciones en ciudades argentinas

    Directory of Open Access Journals (Sweden)

    Nora Clichevsky

    2006-01-01

    Full Text Available En este trabajo se presentan los resultados de una investigación sobre las relaciones que se establecen entre los mercados de tierra urbana y las inundaciones en ciudades argentinas, en el marco más amplio de la vulnerabilidad urbana. Se pretende despejar incógnitas acerca del papel jugado por el Estado como regulador del mercado en áreas urbanas con vulnerabilidad natural a la inundación y como constructor de defensas contra las inundaciones y acerca de los impactos que han tenido las inundaciones y las obras de defensa contra ellas sobre el mercado de tierra y, por lo tanto, sobre el acceso al suelo urbano por parte de los distintos sectores de la población.

  16. Map showing the distribution and characteristics of plutonic rocks in the Tonopah 1 degree by 2 degrees Quadrangle, central Nevada

    Science.gov (United States)

    John, D.A.

    1987-01-01

    Plutonic rocks, mostly granite and granodiorite, are widely distributed in the west two-thirds of the Tonopah 1 degree by 2 degree quadrangle, Nevada. These rocks were systematically studied as part of the Tonopah CUSMAP project. Studies included field mapping, petrographic and modal analyses, geochemical studies of both fresh and altered plutonic rocks and altered wallrocks, and K-Ar and Rb-Sr radiometric dating. Data collected during this study were combined with previously published data to produce a 1:250,000-scale map of the Tonopah quadrangle showing the distribution of individual plutons and an accompanying table summarizing composition, texture, age, and any noted hydrothermal alteration and mineralization effects for each pluton.

  17. EMPREENDEDORISMO JOVEM: DA ESCOLA PARA O MERCADO DE TRABALHO

    OpenAIRE

    Gomes, Danilo Cortez; Professor de Administração no IFRN - Campus Currais Novos.; de Farias Silva, Luciano Alexandre; Aluno do curso técnico integrado em informática do IFRN - Campus Currais Novos.; D´Anjour, Miler Franco; PPGA/UFRN; Moreno Añez, Miguel Eduardo; PPGA/UFRN

    2014-01-01

    O empreendedorismo jovem apresenta-se como forma de inclusão de jovens no mercado de trabalho e em contrapartida é fator preponderante para promoção do desenvolvimento socioeconômico brasileiro (LIMA-FILHO, SPROESSER, MATINS, 2009). Nesta perspectiva, o objetivo central desse artigo é discutir o ensino do empreendedorismo para os jovens utilizando como “case” o projeto “Empreendedorismo jovem: da escola para o mercado de trabalho” que buscou estimular os alunos do IFRN – Campus Currais Novos ...

  18. Las mujeres en el mercado laboral en perspectiva europea

    OpenAIRE

    Moltó Carbonell, María Luisa

    1998-01-01

    En este artículo se analiza la situación de las mujeres en el mercado laboral europeo, utilizando la base de datos de Eurostat New Cronos. Dicha situación responde a la evolución de tres tipos de factores: la voluntad y capacidad de las mujeres para participar en el mercado laboral, los relacionados con la demanda de trabajo y las políticas de empleo. Esta exposición se centra, por tanto, en la participación femenina, la ocupación, el desempleo, las formas de empleo atípicas y las diferencias...

  19. Orden monetario de las economías de mercado

    Directory of Open Access Journals (Sweden)

    Aglietta Michel

    2002-08-01

    Full Text Available Al explicar el mercado a partir de la institucióm monetaria y no al revés, como es la costumbre en los economistas, este articulo ofrece una nueva visión para comprender la naturaleza del dinero, las condiciones de la viabilidad de la sociedad de mercado, el origen y control de las crisis financieras y monetarias, y finalmente, tratar la independencia del Banco Central como una organización institucional particular que se propone para la regulacion del sistema cada día ás globalizado.

  20. ORDEN MONETARIO DE LAS ECONOMÍAS DE MERCADO

    Directory of Open Access Journals (Sweden)

    Michel Aglietta

    2002-06-01

    Full Text Available Al explicar el mercado a partir de la institución monetaria y no al revés, como es costumbre en los economistas, este artículo ofrece una nueva visión para comprender la naturaleza del dinero, las condiciones de viabilidad de la sociedad de mercado, el origen y control de las crisis financieras y monetarias y finalmente, tratar la independencia del Banco Central como una organización institucional particular que se propone para la regulación del sistema cada día más globalizado.

  1. River Valley pluton, Ontario - A late-Archean/early-Proterozoic anorthositic intrusion in the Grenville Province

    Science.gov (United States)

    Ashwal, Lewis D.; Wooden, Joseph L.

    1989-01-01

    This paper presents Nd, Sr, and Pb isotopic data indicating a late-Archean/early-Proterozoic age for the River Valley anorthositic pluton of the southwestern Grenville Province of Sudbury, Ontario. Pb-Pb isotopic data on 10 whole-rock samples ranging in composition from anorthosite to gabbro yield an age of 2560 + or - 155 Ma. The River Valley pluton is thus the oldest anorthositic intrusive yet recognized within the Grenville Province. The Sm-Nd isotopic system records an age of 2377 + or - 68 Ma. High Pb-208/Pb-204 of deformed samples relative to igneous-textured rocks implies Th introduction and/or U loss during metamorphism in the River Valley area. Rb-Sr data from igneous-textured and deformed samples and from mineral separates give an age of 2185 + or - 105 Ma, indicating substantial disturbance of the Rb-Sr isotopic system.

  2. Geology, geochemistry, age and tectonic setting of the Gore-Gambella plutonic rocks, western Ethiopia

    Energy Technology Data Exchange (ETDEWEB)

    Alemayehu, T.A.

    1989-01-01

    In transect across the Birbir and Baro domains of western Ethiopia, distinct granitoid suites are recognized on the basis of their field relations, petrology, chemical features and age. The Baro Domain consists of migmatitic, upper amphibolite facies gneisses and metaleucogranites. The Birbir Domain consists of lower amphibolite facies rocks with abundant intrusive and meta-intrusive rocks of mafic and intermediate composition. A ductile, transcurrent fault system, the Birbir Shear Zone, traverses the Birbir Domain. Kinematic indicators such as disrupted dykes and sills within the shear zone suggest major dextral movement which was succeeded by sinistral movement during its final stage. The pre- to syn-kinematic intrusives within the Birbir Domain are metamorphosed and mylonitized to variable degrees. Geochemical and isotopic data from early plutonic units in the Birbir Domain reflect arc-type igneous activity; late- to post-kinematic plutons are more alkalic and of intraplate character. U-Pb zircon and Rb-Sr whole-rock isochron dates show plutonic activity between 830 and 540 Ma. A whole-rock Rb-Sr date of 760 Ma from a pre- to syn-kinematic pluton coincides with the age of low-grade metamorphism of arc-related rocks of the Red Sea Hills of NE Africa and the Jeddah terrane of Arabia. The Birbir Domain is a southward extension of the Pan-African crust of NE Africa and Arabia. The Birbir shear zone indicates a tectonically active continental margin along which magmatic arc rocks were accreted. The Baro Domain is interpreted as a reactivated pre-Pan-African continental margin linked to the Mozambique Belt of east Africa. A subduction model, involving closure of an ocean basin, is proposed for the evolution of rocks of the Birbir Domain.

  3. Unusual Rb-Sr data on the age of two typical peralkaline granitoid plutons in West Transbeikalia

    International Nuclear Information System (INIS)

    Litvinovskij, B.A.; Posokhov, V.F.; Zanvilevich, A.N.

    1995-01-01

    Rb-Sr isotope study of two typical plutons in West Transbaikalia (Bryansk and Kharitonov) has been carried out. For alkaline and peralkaline suits of the Bryansk pluton the obtained data are 287 ± m.y., I Sx =0.7054 ± 3 and 285 ± 1 m.y., I Sr =0.7037 ± 3 respectively. Rb-Sr age of peralkaline syenites and granites from the Kharitonov pluton are in more or less consistency with those on the Malokunal pluton (233 ± 5 m.y.) and much less than the age of the Khorinsk pluton (253 ± 3 m.y.). Taking into account the K-Ar data on amphibole from the peralkaline granitoids it is concluded that probable age of these rocks span the interval 250-220 m.y. However results obtained from the Bryansk pluton suggest that within the Mongolia-Transbaikalia belt one more stage of peralkaline granitoid generation i.e. the Early Permian stage could be manifested as well. 20 refs.; 5 figs.; 3 tabs

  4. Radiogeologic assessment for nuclear waste isolation: studies of the Stripa pluton

    International Nuclear Information System (INIS)

    Wollenberg, H.; Flexser, S.; Andersson, L.

    1982-01-01

    To properly characterize candidate sites for radioactive waste isolation, it will be necessary to obtain a good understanding of their radiogeologic settings. The distribution and abundance of the naturally occurring radioelements - 238 U, 232 Th, their daughters, and 40 K, both in the rock mass encompassing the repository and in the neighboring rocks - constitute the baseline upon which the effects of the radioactive waste are superimposed. The distribution of these radioelements is also a good indicator of the geochemical homogeneity of the rock mass. At the Stripa experimental facility in an inactive iron mine in central Sweden, radiogeologic studies included gamma-spectrometric surveys, on the surface and underground, of the U, Th, and K contents of the quartz monzonite pluton encompassing the experiments, the high-grade metamorphic rocks surrounding the pluton, and the neighboring larger granitic plutons. The gamma-spectral surveys were calibrated by laboratory analyses of hand specimens and drill cores, permitting calculation of radioelement concentrations from field counting rates

  5. Erupted frothy xenoliths may explain lack of country-rock fragments in plutons

    Science.gov (United States)

    Burchardt, Steffi; Troll, Valentin R.; Schmeling, Harro; Koyi, Hemin; Blythe, Lara

    2016-01-01

    Magmatic stoping is discussed to be a main mechanism of magma emplacement. As a consequence of stoping, abundant country-rock fragments should occur within, and at the bottom of, magma reservoirs as “xenolith graveyards”, or become assimilated. However, the common absence of sufficient amounts of both xenoliths and crustal contamination have led to intense controversy about the efficiency of stoping. Here, we present new evidence that may explain the absence of abundant country-rock fragments in plutons. We report on vesiculated crustal xenoliths in volcanic rocks that experienced devolatilisation during heating and partial melting when entrained in magma. We hypothesise that the consequential inflation and density decrease of the xenoliths allowed them to rise and become erupted instead of being preserved in the plutonic record. Our thermomechanical simulations of this process demonstrate that early-stage xenolith sinking can be followed by the rise of a heated, partially-molten xenolith towards the top of the reservoir. There, remnants may disintegrate and mix with resident magma or erupt. Shallow-crustal plutons emplaced into hydrous country rocks may therefore not necessarily contain evidence of the true amount of magmatic stoping during their emplacement. Further studies are needed to quantify the importance of frothy xenolith in removing stoped material. PMID:27804996

  6. Los mercados de abastos y las ciudades turisticas

    Directory of Open Access Journals (Sweden)

    Montserrat Crespi Vallbona

    2016-01-01

    Full Text Available En este artículo se analiza la importancia de los mercados de abastos como espacios turísticos en el planteamiento promocional de la ciudad y sus consecuencias sobre ésta. Los casos de Barcelona y Madrid nos sirven para ilustrar esta realidad. Concretamente, los mercados de La Boquería, Santa Caterina, Barceloneta, La Princesa y Sant Antoni (para Barcelona; San Miguel, San Antón, La Cebada, Barceló, San Fernando, Antón Martín y Los Mostenses (en Madrid. Y en éstos, lo que presenciamos es que los mercados de abastos presentan diversas fisonomías en función del grado de turistificación que puede constatarse en ellos. Así pues, nos planteamos establecer una tipología de mercados, a partir de diferentes variables que determinan la actual evolución de estos espacios desde ser equipamientos y servicios públicos a ser equipamientos propiamente de comercio y consumo, y las consecuencias que reportan para la ciudad cada uno de ellos.

  7. Prioridades de Clientes de los Mercados de los Agricultores

    OpenAIRE

    Curtis, Kynda; Gumirakiza, J. Dominique

    2014-01-01

    Los mercados de los agricultores ofrecen una experiencia de compra alternativa, especialmente para aquellos consumidores que buscan productos agrícolas frescos, de alta calidad y saludables (Holloway y Kneafsey, 2000; Brown, 2001; Archer et al., 2003; McGarry-Wolf et al., 2005; Zepeda y Deal, 2009; Lyon et al., 2009; Cole 2010; y USDAAMS, 2011).

  8. A HIPÓTESE CONJUNTA DO CAPM E MERCADO EFICIENTE

    Directory of Open Access Journals (Sweden)

    César Martins Guimarães

    2006-05-01

    Full Text Available O CAPM é utilizado para testar a eficiência de mercados desde o final dos anos 1960. O objetivo deste trabalho foi testar a hipótese conjunta do CAPM e da eficiência do mercado brasileiro de ações nos cinco anos compreendidos entre abril de 2000 e março de 2005, através da análise do desempenho de fundos mútuos de ações. O Alfa de Jensen foi escolhido como medida de retorno extraordinário dos fundos de ações, por considerar o ajuste do resultado em relação � exposição da carteira ao risco sistemático. Os dados apontaram que não há evidências de ineficiência de mercado para o período analisado, assumindo-se ser o IBX e o Ibovespa índices representativos da carteira de mercado e o CDI de um dia uma taxa representativa do ativo livre de risco.

  9. A HIPÃTESE CONJUNTA DO CAPM E MERCADO EFICIENTE

    Directory of Open Access Journals (Sweden)

    César Martins Guimarães

    2006-05-01

    Full Text Available O CAPM é utilizado para testar a eficiência de mercados desde o final dos anos 1960. O objetivo deste trabalho foi testar a hipótese conjunta do CAPM e da eficiência do mercado brasileiro de ações nos cinco anos compreendidos entre abril de 2000 e março de 2005, através da análise do desempenho de fundos mútuos de ações. O Alfa de Jensen foi escolhido como medida de retorno extraordinário dos fundos de ações, por considerar o ajuste do resultado em relação exposição da carteira ao risco sistemático. Os dados apontaram que não há evidências de ineficiência de mercado para o período analisado, assumindo-se ser o IBX e o Ibovespa índices representativos da carteira de mercado e o CDI de um dia uma taxa representativa do ativo livre de risco.

  10. Characteristics and mode of emplacement of gneiss domes and plutonic domes in central-eastern Pyrenees

    Science.gov (United States)

    Soula, Jean-Claude

    Gneiss domes and plutonic granitoid domes make up almost 50% of the pre-Hercynian terrains in the Central and Eastern Pyrenees. From a structural study of the shape and internal structure of the domes and of their relationships with the enclosing rocks, it can be shown that both types of domes were emplaced diapirically during the major regional deformation phase and the peak of regional metamorphism. The study also shows that the internal structure, the overall shape and general behaviour relative to the host rocks are similar for plutonic domes and for gneiss domes. This appears to be in good agreement with H. Ramberg's (1967, Gravity Deformation and the Earth's Crust. Academic Press, London; 1970, Model studies in relation to intrusion of plutonic bodies. In: Mechanisms of Igneous Intrusion (edited by Newall, G. & Rast, N.) Geol. J. Spec. Issue2, 261-286.) model studies showing that dome or mushroom-like structures, similar to those observed, develop when there is a small viscosity ratio between the rising body and its enclosing medium. This implies a high crystal content for the granitoid magma. This crystal content has been estimated by (i) calculating the viscosity and density in natural conditions from petrological data for the magma considered as a suspension, using the model and program of J. P. Carron et al. (1978 Bull Soc. géol. Fr.20, 739-744.); (ii) using the recent results of experimental deformation of partially melted granites of I. van der Molen & M. S. Paterson (1979, Contr. Miner. Petrol.70, 299-318.) and (ii) comparing the preceding results with the data obtained by deformation experiments on rocks similar to those enclosing the domes. The minimum crystal content for the development of a dome-like structure has been, thus, estimated to about 70%, i.e. a value very close to that estimated by van der Molen & Paterson (1979) to be the critical value separating the granular framework flow from suspension-like behaviour. The effect of small

  11. Distinctly different parental magmas for plutons and lavas in the central Aleutian arc

    Science.gov (United States)

    Cai, Y.; Rioux, M. E.; Kelemen, P. B.; Goldstein, S. L.; Bolge, L.; Kylander-Clark, A. R.

    2014-12-01

    While it is generally agreed that continental crust is generated by arc magmatism, average arc lavas are basaltic while the bulk continental crust is andesitic, and this has led to many models for secondary reprocessing of the arc crust in order to form continental crust. We report new data on calc-alkaline plutons in the central Aleutians showing that they have distinctly different sources compared to Holocene tholeiitic lavas. Therefore the lavas are not representative of the net magmatic transfer from the mantle into the arc crust. Eocene to Miocene (9-39 Ma) intermediate to felsic plutonic rocks from the central Aleutian arc show higher SiO2 at a given Mg#, higher ɛNd- and ɛHf-values, and lower Pb isotope ratios than Holocene volcanic rocks from the same region. Instead, the plutonic rocks resemble volcanics from the western Aleutians isotopically, and have chemical compositions similar to bulk continental crust. These data could reflect temporal variation of Aleutian magma source compositions, from Eocene-Miocene "isotopically depleted" and predominantly calc-alkaline to Holocene "isotopically enriched" and predominantly tholeiitic. Alternatively, they may reflect different transport and emplacement processes for the magmas that form plutons and lavas: calc-alkaline magmas with higher Si content and high viscosity may preferentially form plutons, perhaps after extensive mid-crustal degassing of initially high water contents. The latter case implies that the upper and middle arc crust is more like the calc-alkaline bulk composition of the continental crust than the lavas alone. Crustal reprocessing mechanisms that preserve upper and middle arc crust, while removing lower arc crust, can account for the genesis and evolution of continental crust. Since gabbroic lower arc crust extends from ca 20-40 km depth, and is density stable over most of this depth range, "delamination" of dense lithologies [1] may not be sufficient to accomplish this. Alternatively

  12. El papel del regulador en el mercado de las telecomunicaciones

    Directory of Open Access Journals (Sweden)

    Carlos Alberto Herrera Barros

    2006-05-01

    Full Text Available La regulación de mercados surge ante la ausencia de competencia efectiva en un sector, lo cual generalmente produce que los agentes tienden a asumir comportamientos monopólicos y por tal motivo el regulador debe identificar las fallas de mercado a fin de corregirlas. Mientras se reduce la dispersión normativa del sector de telecomunicaciones en Colombia, el regulador debe reconocer el dinamismo de los mercados para garantizar el cumplimiento de los objetivos legales y regulatorios de promoción de la competencia y protección a los usuarios. Vale la pena entonces preguntarse si es cierto que en Colombia ya estamos en un mercado de telecomunicaciones en el cual existe un nivel de competencia tal, que se hace innecesaria la regulación sectorial ex-ante. Para esto, el autor hace un breve análisis de cuales son las realidades y perspectivas en algunos de los subsegmentos de mercado en el sector de telecomunicaciones, y finalmente cierra el escrito con algunas conclusiones relevantes sobre el tema. / Market regulation arises because of the absence of effective competition in a sector, where the players tend to assume monopolistic behaviors . Regulators must identify the market failures in order to correct them. As normative dispersion of different services rules the Colombian telecommunications sector, it's important that regulator approaches to market analysis through predictable and similar criteria which recognize the dynamism of the markets to guarantee legal and regulatory objectives of promotion of the competition and protection to the consumers .We wonder if It is true in Colombia we already are experiencing such a high competitive telecommunications market which does not needs ex-ante regulation.. the author makes a brief analysis of the perspectives and realities in some of the segments of market and finally the author closes the writing with some important conclusions about the subject.

  13. Depositional features and stratigraphic sections in granitic plutons: implications for the emplacement and crystallization of granitic magma

    Science.gov (United States)

    Wiebe, R. A.; Collins, W. J.

    1998-09-01

    Many granitic plutons contain sheet-like masses of dioritic to gabbroic rocks or swarms of mafic to intermediate enclaves which represent the input of higher temperature, more mafic magma during crystallization of the granitic plutons. Small-scale structures associated with these bodies (e.g. load-cast and compaction features, silicic pipes extending from granitic layers into adjacent gabbroic sheets) indicate that the sheets and enclave swarms were deposited on a floor of the magma chamber (on granitic crystal mush and beneath crystal-poor magma) while the mafic magma was incompletely crystallized. These structures indicate 'way up', typically toward the interior of the intrusions, and appear to indicate that packages of mafic sheets and enclave concentrations in these plutons are a record of sequential deposition. Hence, these plutons preserve a stratigraphic history of events involved in the construction (filling, replenishment) and crystallization of the magma chamber. The distinctive features of these depositional portions of plutons allow them to be distinguished from sheeted intrusions, which usually preserve mutual intrusive contacts and 'dike-sill' relations of different magma types. The considerable thickness of material that can be interpreted as depositional, and the evidence for replenishment, suggest that magma chamber volumes at any one time were probably much less than the final size of the pluton. Thus, magma chambers may be constructed much more slowly than presently envisaged. The present steep attitudes of these structures in many plutons may have developed gradually as the floor of the chamber (along with the underlying solidified granite and country rock) sank during continuing episodes of magma chamber replenishment. These internal magmatic structures support recent suggestions that the room problem for granites could be largely accommodated by downward movement of country rock beneath the magma chamber.

  14. Determination of emplacement mechanism of Zafarghand granitoid Pluton (Southeast of Ardestan by using anisotropy of magnetic susceptibility method (AMS

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    Mahmoud Sadeghian

    2017-03-01

    Full Text Available Zafarghand granitoid pluton with compositional range from gabbro to granite and early to middle Miocene age cropped out about 35 km of SE Ardestan. This pluton intrudedthe Eocene volcanic and volcanosedimentary rocks of the Urumieh - Dokhtar structuralzone. In this research, for the first time, the emplacement mechanism of Zafarghandgranitoidic pluton method has been investigated using of anisotropy of magneticsusceptibility (AMS. Based on field observations, as well as petrography andinterpretations of magnetic parameters, Zafarghand pluton divided into 5 domains (1A,1B, 2, 3, 4 and 5. Domain 1, in turn, is divided into 1A and 1B. Domains 2 and 4 arelithologically, gabbro to quartzdiorite and have been emplaced first. They have playedas feeder zones. Domains 1A, 1B, 3, and 5 are dominantly granodioritic to graniticcomposition and have been emplaced as a big and low dip magmatic flow (or possibly as a sill. The occurrence of gabbro to quartzdiorite as well as grandiorite, granite andtonalite in the margin borders of the body, are all indication of magma mixing. It isshould be noted that during emplacement of the pluton studied, fractionalcrystallization, magma mixing and crustal contamination contributed to its generationand the evolution as well.

  15. An integrated geological, geochemical, and geophysical investigation of uranium metallogenesis in selected granitic plutons of the Miramichi Anticlinorium, New Brunswick

    International Nuclear Information System (INIS)

    Hassan, H.H.; McAllister, A.L.

    1992-01-01

    Integrated geological, geochemical, and geophysical data for the post-tectonic granitic rocks of the North Pole, Burnthill, Dungarvon, Trout Brook, and Rocky Brook plutons and surrounding areas were examined to assess their potential for uranium mineralization. Geological, geochemical, and geophysical criteria that are thought to be useful guides for uranium exploration were also established for the host granites. The granitic plutons were emplaced discordantly, late in the tectonomagmatic sequence and at shallow depths within the metasedimentary rocks of the Miramichi Anticlinorium. Geochemically, the host granites are highly evolved (Si0 2 > 75 wt. %), peraluminous and have strong similarities with ilmenite-series 'S-type' and 'A-type' granitoids. Uranium occurrences are spatially and perhaps temporally associated with late-phase differentiates of the plutons where elevated levels of other lithophile elements such as Sn, W, Mo, and F were also detected. Geophysically, the granitic plutons are associated with distinctively high aeroradiometric eU, eTh, and K anomalies that coincide with strong negative Bouguer anomalies and low magnetic values. Conceptual models involving magmatic and hydrothermal processes have been adopted to explain the concentration of uranium and associated metals in the granitic plutons

  16. The chemical and isotopic differentiation of an epizonal magma body: Organ Needle pluton, New Mexico

    Science.gov (United States)

    Verplanck, P.L.; Farmer, G.L.; McCurry, M.; Mertzman, S.A.

    1999-01-01

    Major and trace element, and Nd and Sr isotopic compositions of whole rocks and mineral separates from the Oligocene, alkaline Organ Needle pluton (ONP), southern New Mexico, constrain models for the differentiation of the magma body parental to this compositionally zoned and layered epizonal intrusive body. The data reveal that the pluton is rimmed by lower ??(Nd) (~-5) and higher 87Sr/86Sr (~0.7085) syenitic rocks than those in its interior (??(Nd) ~ 2, 87Sr/86Sr ~0.7060) and that the bulk compositions of the marginal rocks become more felsic with decreasing structural depth. At the deepest exposed levels of the pluton, the ??(Nd)~-5 lithology is a compositionally heterogeneous inequigranular syenite. Modal, compositional and isotopic data from separates of rare earth element (REE)-bearing major and accesory mineral phases (hornblende, titanite, apatite, zircon) demonstrate that this decoupling of trace and major elements in the inequigranular syenite results from accumulation of light REE (LREE)-bearing minerals that were evidently separated from silicic magmas as the latter rose along the sides of the magma chamber. Chemical and isotopic data for microgranular mafic enclaves, as well as for restite xenoliths of Precambrian granite wall rock, indicate that the isotopic distinction between the marginal and interior facies of the ONP probably reflects assimilation of the wall rock by ??(Nd) ~-2 mafic magmas near the base of the magma system. Fractional crystallization and crystal liquid separation of the crystally contaminated magma at the base and along the margins of the chamber generated the highly silicic magmas that ultimately pooled at the chamber top.

  17. PLUTON, Isotope Generation and Depletion in Highly Irradiated LWR Fuel Rods

    International Nuclear Information System (INIS)

    Lemehov, Sergei; Motoe, Suzuki

    2003-01-01

    1 - Description of program or function: The PLUTON-PC is a three-group neutronic code analyzing, as functions of time and burnup, the change of radial profiles, together with average values, of power density, burnup, concentration of trans-uranium elements, plutonium buildup, depletion of fissile elements, and fission product generation in water reactor fuel rod with standard UO 2 , UO 2 -Gd 2 O 3 , inhomogeneous MOX, and UO 2 -ThO 2 . The PLUTON-PC code, which has been designed to be run on Windows PC, has adopted a theoretical shape function of neutron attenuation in pellet, which enables users to perform a very fast and accurate calculation easily. The code includes the irradiation conditions of the Halden Reactor which gives verification data for the code. Verification has been performed up to 83 GWd/tU, and a satisfactory agreement has been obtained. 2 - Methods: Based upon cumulative yields, the PLUTON-PC code calculates as a function of radial position and local burnup concentrations of fission products, macroscopic scattering cross-sections and self-shielding effect which is important for standard fuel (for Pu-242 mainly) and more importantly for homogeneous and inhomogeneous MOX fuel because of higher concentrations of fissile and fertile isotopes of plutonium. The code results in burnup dependent fission rate density profiles throughout the in-reactor irradiation of LWR fuel rods. The isotopes included in calculations have been extended to cover all trans-uranium groups (plutonium plus higher actinides) of fissile and fertile isotopes. Self-shielding problem and scattering effects have been revised and solved for all isotopes in the calculations for adequacy at high burnup, different irradiation conditions and cladding materials

  18. Sm-Nd whole-rock isotope system of the Eye-Dashwa Lakes pluton

    International Nuclear Information System (INIS)

    Futa, K.

    1990-01-01

    An unaltered drill-core sample of the Eye-Dashwa Lakes pluton (sample ATK-1 (990.97-996.78)) is light rare earth enriched, with a 147 Sm/ 144 Nd ratio of 0.08699 and a 143 Nd/ 144 Nd ratio of 0.510815. The depleted mantle model age of 2.68 Ga agrees with emplacement ages, indicating that parental magma or its protolith was derived directly from a depleted mantle and that the crustal residence time was short

  19. Loparite-(Ce) from the Khibiny Alkaline Pluton, Kola Peninsula, Russia

    Science.gov (United States)

    Konopleva, N. G.; Ivanyuk, G. Yu.; Pakhomovsky, Ya. A.; Yakovenchuk, V. N.; Mikhailova, Yu. A.

    2017-12-01

    Data on the occurrence, morphology, anatomy, composition, and formation conditions of loparite-(Ce) in the Khibiny alkaline pluton are given. Loparite-(Ce), (Na,Ce,Sr)(Ce,Th)(Ti,Nb)2O6, resulted from metasomatic alteration and assimilation of metamorphic host rocks at the contact with foyaite as well as foyaite on the contact with foidolite. This alteration was the highest in pegmatite, and albitite developed there. A decrease in temperature resulted in enrichment of the perovskite and tausonite endmembers in loparite-(Ce) owing to a decrease in the loparite and lueshite endmembers. La and Ce sharply predominate among rare earth elements in the composition of loparite-(Ce).

  20. Occurrence of parsonite, a secondary uranium mineral, in alaskite of the Wheeler Creek pluton, Alaska

    International Nuclear Information System (INIS)

    Miller, T.P.; Johnson, B.

    1978-01-01

    Reconnaissance investigations in the Purcell Mountains of westcentral Alaska in 1977 revealed the presence of parsonite, a hydrous phosphate of lead and uranium with the formula Pb 2 UO 2 (PO 4 ) 2 2H 2 O. This is the first reported occurrence of parsonite in Alaska. The parsonite occurs as a soft, yellow to chocolate brown coating closely associated with green muscovite on fracture surfaces in a shear zone in alaskite of the Wheeler Creek pluton. Thin magnetite veinlets are also present. The identification of parsonite was confirmed by x-ray diffraction. Delayed neutron analysis were run on samples of the Alaskite

  1. Porfiroblastic hornblendites: lithological, guide of arch root plutonism in Piedra Alta Terrane. (Paleoproterozoic, Uruguay)

    International Nuclear Information System (INIS)

    Bossi, J.; Pineyro, D.

    2004-01-01

    Petrographic and geochemical features of porphyroblastic hornblendites in Piedra Alta Terrene of Uruguay are described. Their spatial and genetic relationships whith hornblendic gabbros and other basic plutonic rocks is also stablished. Their association with low grade metamorphic supracrustals inmagmatic mingling structures and late development, suggests an origin related to high vapour pressure that take off stability to gabbro paragenesis and favours Deer's reaction:pyroxene+ plagioclase +water= hornblende + SIO2. The silica produced is expressed as quartz dikes frequently mineralized with gold and platinum group elements. San Carlos gabbro is an uruguayan exemple of such proposed model.

  2. Platinum, palladium, and rhodium in volcanic and plutonic rocks from the Gravina-Nutzotin belt, Alaska

    Science.gov (United States)

    Page, Norman J; Berg, Henry C.; Haffty, Joseph

    1977-01-01

    The Gravina-Nutzotin belt of Middle (?) Jurassic to middle Cretaceous sedimentary and volcanic rocks in south and southeastern Alaska includes concentrically zoned ultramafic complexes known to contain platinum-group metals. Previous isotopic, petrologic, and geologic studies suggested a close relation in time and space between the volcanic rocks and the ultramafic complexes. Interpretation of 40 analyses for platinum, palladium, and rhodium in volcanic and plutonic rocks of the belt indicates a strong geochemical correlation between the two groups of rocks and is in support of their being cogenetic either from directly connected magma chambers and flows or indirectly by selective concentration processes from similar mantle material.

  3. Fraude e branqueamento de capitais no mercado da droga

    OpenAIRE

    Amaro, Andreia Ramos

    2017-01-01

    Versão final (Esta versão contém as críticas e sugestões dos elementos do júri) Ao longo das últimas décadas e com a crescente globalização, os infratores têm adotado novos e sofisticados métodos de ocultação de capitais ilícitos, nomeadamente, provenientes da droga. Perante isto, o presente trabalho foca-se na temática do branqueamento de capitais e da fraude no mercado da droga, sendo o seu grande objetivo o estudo da relação entre branqueamento de capitais, fraude e o mercado da drog...

  4. Site investigation methods used in Canada's nuclear fuel waste management program to determine the hydrogeological conditions of plutonic rock

    International Nuclear Information System (INIS)

    Davison, C.C.

    1985-01-01

    Atomic Energy of Canada Limited (AECL) is investigating the concept of disposing of Canada's nuclear fuel wastes in a mined vault at a depth of 500 m to 1000 m within a plutonic rock body. Much effort has been directed at developing site investigation methods that can be used to determine the hydrogeological conditions of plutonic rock bodies. The primary objective of this research is to define the physical and chemical characteristics of groundwater flow systems at the various scales that are relevant to the prediction of potential radionuclide migration from a disposal vault. Groundwater movement through plutonic rock is largely controlled by fractures within the rock, and the hydrogeological parameters of fractured geological media are extremely scale dependent

  5. Investigation of the mineral potential of the Clipper Gap, Lone Mountain-Weepah, and Pipe Spring plutons, Nevada

    International Nuclear Information System (INIS)

    Tingley, J.V.; Maldonado, F.

    1983-01-01

    The Clipper Gap pluton, composed mostly of quartz monzonite with minor granite, granodiorite, and crosscutting alaskite dikes, intrudes Paleozoic western facies strata. A narrow zone of contact metamorphism is present at the intrusive-sediment contact. No mineral production has been recorded from Clipper Gap, but quartz veins containing gold-silver-copper mineral occurrences have been prospected there from the late 1800's to the present. Areas of the Lone Mountain-Weepah plutons that were studied are located in Esmeralda County about 14 km west of Tonopah, Nevada. At Lone Mountain, a Cretaceous intrusive cuts folded Precambrian and Cambrian sediments. Lead-zinc ores have been mined from small replacement ore bodies in the Alpine district, west of Lone Mountain. Copper and molybdenum occurrences have been found along the east flank of Lone Mountain, and altered areas were noted in intrusive outcrops around the south end of Lone Mountain. Mineral occurrences are widespread and varied with mining activity dating back to the 1860's. The Pipe Spring pluton study area is flanked by two important mining districts, Manhattan to the north and Belmont to the northeast. Mining activity at Belmont dates from 1865. Activity at Manhattan was mainly between 1907 and 1947, but the district is active at the present time (1979). Four smaller mining areas, Monarch, Spanish Springs, Baxter Spring, and Willow Springs, are within the general boundary of the area. The Pipe Spring pluton study area contains numerous prospects along the northern contact zone of the pluton. Tungsten-bearing veins occur within the pluton near Spanish Springs, with potential for gold-tungsten placer in the Ralston Valley. Nickel and associated metals occur at Willow Spring and Monarch Ranch, where prospects may be associated with the margin of the Big Ten Peak Caldera

  6. Petrography and geochemistry of five granitic plutons from south central Uruguay: contribution to the knowledge of the Piedra Alta terrane

    International Nuclear Information System (INIS)

    Preciozzi, F.

    2005-01-01

    Granitoid rocks in south-central Uruguay are largely concentrated in three east-west trending metamorphic belts, known as (from south to north) the Montevideo Belt, the San José Belt and the Arroyo Grande Belt. These belts are separated from one another by intervening bands of gneisses of granitic composition. The whole assemblage, the gneisses as well as the metamorphic belts and their associated granites, collectively constitute the Piedra Alta Terrane. Five of these granite plutons, two from the San José Belt and three from the Arroyo Grande Belt, have been studied in some detail and the chemical composition of 86 samples (major elements as well as a selected suite of trace elements) have been determined. These data, as well as Rb-Sr isotopic data, show that these plutons are typically composite in nature, and that the various units range in age from 1900 Ma to 2500 Ma. The older ages were obtained from the main units of the plutons themselves whereas the younger ages are from late dykes which were emplaced into the plutons and which are clearly not related to them. The plutons are predominantly, but not exclusively, of calc-alkaline affinity and are typically synorogenic whereas the dykes are post-orogenic and are either calc-alkaline or alkaline in composition. These data have been incorporated into a tectonic model for the Piedra Alta Terrane which is considerably different from that heretofore proposed. The essential features of the geological history of the area are: 1) development of an older ''basement'' of granitic gneisses 2) deposition, upon or adjacent to this gneisses basement, of a typical Archean greenstone belt assemblage (no komatiites so far reported) 3) Paleo-proterozoic metamorphism, followed by syn-tectonic to post-tectonic intrusion of the plutonic rocks 4) major tectonic dislocation(s) associated with the Transamazonian orogeny 5) dyke emplacement (post-orogenic to anorogenic) following the Transamazonian orogeny

  7. Community structure and floristic composition of Quercus fusiformis and Carya illinoinensis forests of the Northeastern Coastal Plain, Coahuila, Mexico Estructura y composición florística de los bosques de Quercus fusiformis y Carya illinoinensis de la planicie costera del noreste, Coahuila, México

    Directory of Open Access Journals (Sweden)

    Juan Antonio Encina-Domínguez

    2011-06-01

    Full Text Available In order to describe community structure and richness in oak and walnut forests occurring along the San Rodrigo, San Diego, Escondido and Arroyo de las Vacas rivers on the Northeastern Coastal Plain (NE Coahuila, Mexico, we established 30 1 000-m² circular plots, where we measured diameter at breast height (DBH and tree heights. Tree regeneration and herb and shrub stratum were assessed in 5 2-m² quadrats per site. A total of 48 species distributed in 29 families were recorded. Families with the largest richness were Poaceae, Asteraceae, and Malvaceae. For the oak forest, tree stratum density and basal area values were 386 stems/ha and 24.36 m²/ha, respectively, whereas for the walnut forest the corresponding values were 302 stems/ha and 21.26 m²/ha. The species with the highest relative importance values were Quercus fusiformis (59.48% and Carya illinoinensis (57.58%. Total tree richness was 14 species, the most common ones being Celtis reticulata and Diospyros texana, followed closely by C. illinoinensis and Q. fusiformis. Anthropogenic impact appears to result in a poor regeneration reflected as a low sapling density, as well as in the reduction and fragmentation of these communities; in turn, this process has led to intrusions of species typical of the xerophytic Tamaulipan Thorn Scrub. Further studies are needed on the regeneration of the dominant species of these forests in order to describe their dynamics and to promote their preservation.Con la finalidad de conocer la estructura y la composición florística de los bosques de encino y nogal situados a lo largo de los ríos San Rodrigo, San Diego, Escondido y Arroyo de las Vacas en la planicie costera nororiental (NE de Coahuila, México, se establecieron 30 parcelas circulares de 1 000 m² en las que se midió el DAP y la altura de las especies arbóreas; además, se evaluó la regeneración de las especies arbóreas y el estrato herbáceo y arbustivo en 5 cuadros de 2 m² por sitio

  8. Syn-extensional plutonism and peak metamorphism in the albion-raft river-grouse creek metamorphic core complex

    Science.gov (United States)

    Strickland, A.; Miller, E.L.; Wooden, J.L.; Kozdon, R.; Valley, J.W.

    2011-01-01

    The Cassia plutonic complex (CPC) is a group of variably deformed, Oligocene granitic plutons exposed in the lower plate of the Albion-Raft River- Grouse Creek (ARG) metamorphic core complex of Idaho and Utah. The plutons range from granodiorite to garnet-bearing, leucogranite, and during intrusion, sillimanite- grade peak metamorphism and ductile attenuation occurred in the country rocks and normal-sense, amphibolite-grade deformation took place along the Middle Mountain shear zone. U-Pb zircon geochronology from three variably deformed plutons exposed in the lower plate of the ARG metamorphic core complex revealed that each zircon is comprised of inherited cores (dominantly late Archean) and Oligocene igneous overgrowths. Within each pluton, a spread of concordant ages from the Oligocene zircon overgrowths is interpreted as zircon recycling within a long-lived magmatic system. The plutons of the CPC have very low negative whole rock ??Nd values of -26 to -35, and initial Sr values of 0.714 to 0.718, consistent with an ancient, crustal source. Oxygen isotope ratios of the Oligocene zircon overgrowths from the CPC have an average ??18O value of 5.40 ?? 0.63 permil (2SD, n = 65) with a slight trend towards higher ??18O values through time. The ??18O values of the inherited cores of the zircons are more variable at 5.93 ?? 1.51 permil (2SD, n = 29). Therefore, we interpret the plutons of the CPC as derived, at least in part, from melting Archean crust based on the isotope geochemistry. In situ partial melting of the exposed Archean basement that was intruded by the Oligocene plutons of the CPC is excluded as the source for the CPC based on field relationships, age and geochemistry. Correlations between Ti and Hf concentrations in zircons from the CPC suggest that the magmatic system may have become hotter (higher Ti concentration in zircon) and less evolved (lower Hf in zircon concentration) through time. Therefore, the CPC represents prolonged or episodic magmatism

  9. Geochemistry and meaning of the geotectonic position of plutonic rocks from Chapada region, Goias, Brazil

    International Nuclear Information System (INIS)

    Kuyumjian, R.M.

    1989-01-01

    In common with other orogenic belts, in which the presence of both, granitic and small basic-ultrabasic intrusions are characteristics of medium-high pressure metamorphic terranes, the geological and geochemical evidences indicate a close relationship between the granitoid, gabbroic and pyroxenitic plutons and the orogenic metabasaltic rocks from the Chapada volcano-sedimentary sequence. The granitoids are tonalitic and, on discriminant diagrams, they plot in the volcanic arc and pre-collisional fields. They display geochemical characteristics similar to the Jamaican oceanic arc-related granities. They show low LIL and HSF element abundances, low (Ta, Nb)/(K, La, etc) ratios and very low concentrations of Th, Hf, K and Y, when compared to patterns of calkaline, alkali-calcic and alkaline-peralkaline granitoids of magmatic arcs. These chemical features are characteristic of immature island arcs mantle-derived intrusives. The Chapada olivine gabbro has a chondrite-normalized spidergram, closely resembling those of island-arc basaltic lavas, the compositions of its coexisting olivine and plagioclase been similar to those from arc-related cumulate gabbros, and therefore, it could be the plutonic equivalent of the arc volcanics in the Chapada region. It is suggested that the evolution of the granitoids and gabbro intrusives from Chapada are related to a process of subduction that occurred in central Brazil during the Brasiliano/Pan-African event. (author) [pt

  10. The Merensky Reef in the Chineisky Pluton (Siberia)? A myth or a reality?

    Science.gov (United States)

    Zhitova, L.; Sharapov, V.; Zhukova, I.

    2006-12-01

    It is a dream of each geologist to find a `Merensky Reef' in each layered basic intrusion. Scientists have been trying many various techniques to come this dream to reality. The most perspective way to do so is probably a combination of physicochemical and computer modeling of layered basic intrusion crystallization together with fluid and melt inclusions studies in situ. This combination allows us to do the following: 1. To study boundary conditions for separation of low density gas phase and salt melt from the crystallizing primary basic melt in large magma chamber. 2. To determine correct quantitative parameters for formation of residual fluid-bearing brines extracting high metal concentrations. 3. To compute critical levels for substance differentiation at phase, geochemical and other `barriers' in those basic mantle-crust ore magmatic systems. 4. To model metal extraction, transportation and deposition at these `barriers' for systems of various `silicate melt - residual salt brines' ratios under the conditions of continental lithosphere. Comparison of real and modeled data allows us to conclude if a formation of a narrow zone of high metal concentration is possible at those critical levels (phase and geochemical `barriers'). The above-mentioned algorithm has been used for the Chineisky Pluton (the Transbaikal region, Siberia). Fortunately we have found our own `Merensky Reef', which happened to be a PGE enrichment marginal zone of the Chineisky Pluton due to specific fluid regime of crystallization! This work was supported by the Ministry for Russian Science and Education, Grant #DSP.2.1.1.702.

  11. The Precambrian/Lower Cambrian pluton from Vila Nova (Central Portugal)

    Energy Technology Data Exchange (ETDEWEB)

    Reis, A. I. M.; Silva, M. M. V. G.; Antunes, I. M. H. R.

    2010-07-01

    The Vila Nova pluton is a small, Pre-Variscan granitic body that intruded rocks of the Central Iberian Zone near the contact with the Ossa Morena Zone and is affected by several shear zones and faults. Its contact metamorphic aureole is constituted by micaschist with porphyroblasts in the outer zone and hornfels in the inner zone. Small mainstreamed xenoliths are dispersed all over the body. The pluton has a great mineralogical heterogeneity with pronounced variations in muscovite/biotite and plagioclase/ microcline contents and is classified as granite, granodiorite or tonalite. It is a leuco granite, highly peraluminous (A/CN K = 1.31 - 1.64), magnesian and calc-alkaline to alkaline-calcic. The variation diagrams show curvilinear trends with silica. Eu/Eu* = 0.47 - 0.77 and there is a slight enrichment in LREE relative to HREE. The normalized diagrams indicated dominantly crustal granite, related to subduction. U-Pb isotopic data of zircon and monazite gives 540-542 Ma age. (Author) 19 refs.

  12. Oxygen isotope exchange kinetics between coexistent minerals and water in the Ertaibei granite pluton, northern Xinjiang

    Institute of Scientific and Technical Information of China (English)

    刘伟; 李志安; 赵志忠

    1996-01-01

    Coexistent minerals quartz, feldspar and biotite vary widely in δ18O value and display remarkable 18O/16O disequilibrium relations in the Ertaibei granite pluton, northern Xinjiang. The 18O/16O exchange reaction definitely occurred between granite and water. Initial δ18O values of the granite and exotic water are evaluated by the mass balance consideration. The results show that the 18O/16O exchange reaction is not necessarily accompanied by what geologists describe as petrological and mineralogiesl alteration effects, indicating that the exchange reaction occurs at a comparatively high temperature during subsolidus cooling of magmas. Exchange mechanism is mainly controlled by diffusion. It is demonstrated through quantitative modelling that the hydrothermal system associated with the Ertaibei pluton lived for 0.8-3 Ma, with a fluid flow rate of 3 × 10-14 mol · s-1 and water/rock (W/R) ratio of 0.79 - 3.08. Flow path and initial heterogeneity of the exotic metamorphic fluid are modelled with the δ1

  13. Emplacement and geochemical evolution of eocene plutonic rocks in the Colville batholith

    International Nuclear Information System (INIS)

    Holder, R.W.

    1986-01-01

    Eocene plutonic rocks in the Colville batholith are divided on the basis of field evidence and chemical composition into, in order of decreasing age, (1) several calc-alkalic biotite-hornblende monzodiorite to granodiorite intrusions referred to as the Devils Elbow suite, and (2) compositionally variable calc-alkalic to alkali-calcic intrusions referred to as the Herron Creek suite. These Eocene suites are distinct from older, more voluminous, leucocratic granite and granodiorite intrusions, designated the Keller Butte suite, which are calcic and characteristically lack hornblende. Results of qualitative and computer modeling of major element variation and quantitative models of trace element variation in the chemically coherent Bridge Creek intrusions, a member of the Herron Creek suite, are compatible with fractionation of plagioclase feldspar + hornblende + biotite + magnetite + apatite from a parent magma of andesitic composition to account for the observed variation. Strongly curved variation trends preclude mixing as the primary mechanism for the observed variation. It is suggested that parallel variation trends in the other Eocene intrusions are also the result of crystal fractionation. Lateral chemical variations including a decrease in silica saturation suggest the chemical characteristics of these rocks reflect those of parental magmas derived from the mantle, with an unknown amount of crustal contribution. Rotated and angular xenoliths, discordant contacts, and temporal and spatial proximity to graben structures indicate that the Eocene plutons were passively implaced into the upper crust along graben-bounding faults during graben formation, the earlier stages of which appear to have been contemporaneous with regional mylonitic deformation

  14. Death Valley turtlebacks: Mesozoic contractional structures overprinted by Cenozoic extension and metamorphism beneath syn-extensional plutons

    Science.gov (United States)

    Pavlis, T. L.; Miller, M.; Serpa, L.

    2008-07-01

    The term turtleback was first coined to describe the curvilinear fault surfaces that produced a distinctive geomorphic form in the Black Mountains east of Death Valley, and although it was decades before their full significance was appreciated, they remain one of the most distinctive features of the extensional structure of the Death Valley region. Historically the interpretation of the features has varied markedly, and misconceptions about their character continue to abound, including descriptions in popular field guides for the area. It the 1990's, however, the full history of the systems began to be apparent from several key data: 1) the dating of the plutonic assemblage associated with the turtlebacks demonstrated that late Miocene, syn-extensional plutonism was fundamental to their formation; 2) the plutonic assemblage forms an intrusive sheet structurally above the turtlebacks, indicating a tie between much of the high grade metamorphism and Cenozoic plutonism; 3) a modern analog for the syn-extensional plutonism in the Black Mountains was recognized beneath Death Valley with the imaging of a mid-crustal magma body; 4) the Neogene structural history was worked out in the turtlebacks showing that folding of early-formed shear zones formed the turtleback anticlinoria but overprinting by brittle faults produced the final form as they cut obliquely across the older structure; and 5) the pre-extensional structural history was clarified, demonstrating that Mesozoic basement-involved thrust systems are present within the turtlebacks, but have been overprinted by the extensional system. An unresolved issue is the significance of Eocene U-Pb dates for pegmatites within the region, but presumably these relate somehow to the pre-extensional history. Miller and Pavlis (2005; E. Sci. Rev.) reviewed many features of the turtlebacks, and our working model for the region is that the turtlebacks originated as mid-crustal ductile-thrust systems within the Cordilleran fold

  15. El proceso de integración de los mercados financieros en Europa

    Directory of Open Access Journals (Sweden)

    Ignacio López Domínguez

    2013-07-01

    Full Text Available En este artículo se estudia el proceso y la situación en la que se encuentra la integración de los mercados financieros en el ámbito europeo. Para ello, se repasa brevemente la situación de los mercados financieros españoles para, posteriormente, analizar la conveniencia de unificar los distintos mercados financieros europeos, así como sus repercusiones en una futura bolsa europea.

  16. Magma flow paths and strain patterns in magma chambers growing by floor subsidence: a model based on magnetic fabric study of shallow-level plutons in the Stiavnica volcano-plutonic complex, Western Carpathians

    Czech Academy of Sciences Publication Activity Database

    Tomek, Filip; Žák, J.; Chadima, Martin

    2014-01-01

    Roč. 76, č. 11 (2014), Article 873 ISSN 0258-8900 Institutional support: RVO:67985831 Keywords : anisotropy of magnetic susceptibility (AMS) * caldera * intrusive strain * magma emplacement * pluton floor subsidence * stratovolcano Subject RIV: DB - Geology ; Mineralogy Impact factor: 2.519, year: 2014

  17. El poder de mercado en industrias minoristas de gas natural vehicular

    OpenAIRE

    García, John J.; Velásquez, Hermilson; Montenegro, Carlos Mauricio

    2014-01-01

    La alta concentración del mercado minorista de Gas Natural Vehicular (GNV) en Colombia permite el ejercicio de poder de mercado. El mecanismo de fijación de precio de venta en las Estaciones de Servicio se asemeja al de un modelo teórico oligopolístico tipo Bertrand, en el cual se identifica una empresa líder en el mercado y otras seguidoras, precio-aceptantes. Por medio del índice de Lerner, se encuentra un mark-up de beneficios cercano al 40% que evidencia el ejercicio de poder de mercado. ...

  18. O ENSINO SUPERIOR EM TURISMO: HUMANO OU MERCADO?

    Directory of Open Access Journals (Sweden)

    Waléria Thabata Roldão Niquini

    2013-06-01

    Full Text Available Desde La creación de la educación superior en el Turismo en Brasil, en La década de 1970, se han producido algunas discusiones en relación a la formación del estudiante y su desempeño en el mercado laboral. Sin embargo hay varios puntos educativos significantes incluso antes de la aparición de la inserción profesional. La preparación de los estudiantes, las acciones de los maestros en la esfera de investigación y extensión y la necesidad del pensamiento crítico son supuestos que poden justificar tal curso mientras que la práctica educativa libertadora. Estas son las cuestiones discutidas en esta investigación destinada a comprender las perspectivas docente y dicente, en la licenciatura en Turismo, sobre la relación entre la enseñanza y el aprendizaje y sus aspectos esenciales, en una más amplia visión y menos fragmentada, entre la destacada dicotomía y el mercado de laboro y el pensamiento crítico científico. Se concluye que el debate académico sobre la educación en el Turismo todavía se disocia sólo entre los intereses del mercado y las discusiones humanas, sin una integración profunda en la relación enseñanza-aprendizaje.

  19. U-Pb ages and Hf isotope compositions of zircons in plutonic rocks from the central Famatinian arc, Argentina

    Science.gov (United States)

    Otamendi, Juan E.; Ducea, Mihai N.; Cristofolini, Eber A.; Tibaldi, Alina M.; Camilletti, Giuliano C.; Bergantz, George W.

    2017-07-01

    The Famatinian arc formed around the South Iapetus rim during the Ordovician, when oceanic lithosphere subducted beneath the West Gondwana margin. We present combined in situ U-Th-Pb and Lu-Hf isotope analyses for zircon to gain insights into the origin and evolution of Famatinian magmatism. Zircon crystals sampled from four intermediate and silicic plutonic rocks confirm previous observations showing that voluminous magmatism took place during a relatively short pulse between the Early and Middle Ordovician (472-465 Ma). The entire zircon population for the four plutonic rocks yields coherent εHf negative values and spreads over several ranges of initial εHf(t) units (-0.3 to -8.0). The range of εHf units in detrital zircons of Famatinian metasedimentary rocks reflects a prolonged history of the cratonic sources during the Proterozoic to the earliest Phanerozoic. Typical tonalites and granodiorites that contain zircons with evolved Hf isotopic compositions formed upon incorporating (meta)sedimentary materials into calc-alkaline metaluminous magmas. The evolved Hf isotope ratios of zircons in the subduction related plutonic rocks strongly reflect the Hf isotopic character of the metasedimentary contaminant, even though the linked differentiation and growth of the Famatinian arc crust was driven by ascending and evolving mantle magmas. Geochronology and Hf isotope systematics in plutonic zircons allow us understanding the petrogenesis of igneous series and the provenance of magma sources. However, these data could be inadequate for computing model ages and supporting models of crustal evolution.

  20. Characterizing and modelling the radionuclide transport properties of fracture zones in plutonic rocks of the Canadian Shield

    International Nuclear Information System (INIS)

    Davison, C.C.; Kozak, E.T.; Frost, L.H.; Everitt, R.A.; Brown, A.; Gascoyne, M.; Scheier, N.W.

    1999-01-01

    Plutonic rocks of the Canadian Shield were investigated as a potential host medium for nuclear fuel waste disposal of used CANDU nuclear fuel. Field investigations at several geologic research areas on the Shield have shown that major fracture zones are the dominant pathways for the large scale movement of groundwater and solutes through plutonic rock bodies. Because of this, a significant amount of the geoscience work has focused on methods to identify, characterize and model the radionuclide transport properties of major fracture zones in the fractured plutonic rocks of the Shield. In order to quantify the transport properties of such fracture zones a series of, groundwater tracer tests were performed over a period of several years in several major, low dipping fracture zones. Sixteen tracer tests were performed using dipole recirculation methods to evaluate transport over distance scales ranging from 17 m to 700 m. It was concluded that only tracer tests can provide useful estimates of the effective porosity and dispersivity characteristics of these large fracture zones in plutonic rocks of the Canadian Shield. (author)

  1. Transpressional granite-emplacement model: Structural and magnetic study of the Pan-African Bandja granitic pluton (West Cameroon)

    Science.gov (United States)

    Sandjo, A. F. Yakeu; Njanko, T.; Njonfang, E.; Errami, E.; Rochette, P.; Fozing, E.

    2016-02-01

    The Pan-African NE-SW elongated Bandja granitic pluton, located at the western part of the Pan-African belt in Cameroon, is a K-feldspar megacryst granite. It is emplaced in banded gneiss and its NW border underwent mylonitization. The magmatic foliation shows NE-SW and NNE-SSW strike directions with moderate to strong dip respectively in its northern and central parts. This mostly, ferromagnetic granite displays magnetic fabrics carried by magnetite and characterized by (i) magnetic foliation with best poles at 295/34, 283/33 and 35/59 respectively in its northern, central and southern parts and (ii) a subhorizontal magnetic lineation with best line at 37/8, 191/9 and 267/22 respectively in the northern, central and southern parts. Magnetic lineation shows an `S' shape trend that allows to (1) consider the complete emplacement and deformation of the pluton during the Pan-African D 2 and D 3 events which occurred in the Pan-African belt in Cameroon and (2) reorganize Pan-African ages from Nguiessi Tchakam et al. (1997) compared with those of the other granitic plutons in the belt as: 686 ±17 Ma (Rb/Sr) for D 1 age of metamorphism recorded in gneiss; and the period between 604-557 Ma for D 2-D 3 emplacement and deformation age of the granitic pluton in a dextral ENE-WSW shear movement.

  2. Transformation of juvenile Izu-Bonin-Mariana oceanic arc into mature continental crust: An example from the Neogene Izu collision zone granitoid plutons, Central Japan

    Science.gov (United States)

    Saito, Satoshi; Tani, Kenichiro

    2017-04-01

    Granitic rocks (sensulato) are major constituents of upper continental crust. Recent reviews reveal that the average composition of Phanerozoic upper continental crust is granodioritic. Although oceanic arcs are regarded as a site producing continental crust material in an oceanic setting, intermediate to felsic igneous rocks occurring in modern oceanic arcs are dominantly tonalitic to trondhjemitic in composition and have lower incompatible element contents than the average upper continental crust. Therefore, juvenile oceanic arcs require additional processes in order to get transformed into mature continental crust enriched in incompatible elements. Neogene granitoid plutons are widely exposed in the Izu Collision Zone in central Japan, where the northern end of the Izu-Bonin-Mariana (IBM) arc (juvenile oceanic arc) has been colliding with the Honshu arc (mature island arc) since Middle Miocene. The plutons in this area are composed of various types of granitoids ranging from tonalite to trondhjemite, granodiorite, monzogranite and granite. Three main granitoid plutons are distributed in this area: Tanzawa plutonic complex, Kofu granitic complex, and Kaikomagatake granitoid pluton. Tanzawa plutonic complex is dominantly composed of tonalite and trondhjemite and characterized by low concentration of incompatible elements and shows geochemical similarity with modern juvenile oceanic arcs. In contrast, Kofu granitic complex and Kaikomagatake granitoid pluton consists mainly of granodiorite, monzogranite and granite and their incompatible element abundances are comparable to the average upper continental crust. Previous petrogenetic studies on these plutons suggested that (1) the Tanzawa plutonic complex formed by lower crustal anatexis of juvenile basaltic rocks occurring in the IBM arc, (2) the Kofu granitic complex formed by anatexis of 'hybrid lower crust' comprising of both basaltic rocks of the IBM arc and metasedimentary rocks of the Honshu arc, and (3) the

  3. Mercado de trabajo y estrategias de valorización

    Directory of Open Access Journals (Sweden)

    IGNASI BRUNET ICART

    1998-01-01

    Full Text Available la tesis que se mantiene en este articulo es que un elemento para el analisis sociologico del mercado de trabajo es la subjetividad de los agentes de las relaciones laborales, tanto de los agentes de control -empresariado- como de los agentes controlados -asalariados-. comprender la construccion social de los agentes de las practicas es un requisito imprescindible para analizar las estrategias de los agentes de las relaciones laborales. se trata de evidenciar que las nuevas configuraciones del mundo de la empresa y del trabajo no estan dadas, sino que dependen de la interaccion de los agentes en un campo estrategico.

  4. Ensayos sobre la sonrisa de volatilidad en mercados de opciones

    OpenAIRE

    Serna Calvo, Gregorio

    2011-01-01

    La tesis comienza analizando los determinantes de la "sonrisa de volatilidad" en el mercado de opciones sobre el indice IBEX-35,obteniendose evidencia de causalidad lineal en el sentido de Granger de los costes de transacción, representados por el diferencial "bid-ask" relativo, ala forma de la sonrisa. A continuación, se propone un modelo de Black-Scholes ampliando donde la volatilidad depende del precio de ejercicio y del diferencial "bid-ask" relativo, obteniendose que dicho modelo no mejo...

  5. Bio-sociodiversidade: preservação e mercado

    Directory of Open Access Journals (Sweden)

    Mauro Leonel

    2000-04-01

    Full Text Available VÁRIOS estudos vêm revelando possibilidades de aproveitamento de conhecimentos indígenas e de outras culturas tradicionais, entre eles, medicamentos, cosméticos, novos materiais, alimentos, sementes e conservantes como produtos de mercado. A prática do mercado vem sendo a de apropriar-se desses bens culturais, registrá-los após adaptações e devolvê-los como mercadorias protegidas por patentes, inclusive aos países onde tais conhecimentos foram desenvolvidos, geralmente ao sul do Equador. Frente à escala da degradação social e ambiental, como na Amazônia, surgiu um novo otimismo, o de que resultados financeiros de tais produtos pudessem reverter às populações, modificando-se a legislação internacional e associando-se cooperativas de produtores com a biotecnologia e as transnacionais. O mercado, o principal adversário da preservação da bio e da sociodiversidade, seria assim convidado - empresas e consumidores - a tornar-se aliado da manutenção da floresta em pé e da diferença cultural, por exemplo, mediante certificados de origem. No entanto, são numerosos os entraves para que essas populações possam abrir brechas no mercado, ou nos sistemas internacionais de registro de patentes, frente à lógica da concentração de capital e tecnologia.SEVERAL studies have been revealing prospects of capitalizing on native knowledge and traditional cultures in order to launch new market products, such as drugs, cosmetics, new materials, foods, seeds and preservers. The market has adopted the practice of appropriating such cultural goods, which after slight adaptation are registered and turned out as patent-protected products and sold even to the countries where that knowledge was first developed, south of the equator as a rule. Vis-à-vis the social and evironmental degradation scale, as is the case of the Amazon area, a new optimism has risen: the hope that financial results from such products could benefit the native peoples

  6. En busca de un posicionamiento de mercado: Modelo de Mercadotecnia

    OpenAIRE

    Nancy Imelda Montero Delgado; Daniel Muñoz Zapata; Sergio Octavio Vázquez Núñez

    2016-01-01

    Esta investigación nace con la finalidad de identificar las variables que inciden en el diseño efectivo de una estrategia de mercadotecnia, de tal forma que el empresario implemente acciones que lo lleven a mejorar la posición en el mercado y su reflejo en el nivel de ventas. Para esto, se observan los modelos que han intentado explicar la efectividad de la mercadotecnia en el tiempo; partiendo así del modelo de Kotler (1977) y se integran los hallazgos identificados en otros modelos, así com...

  7. O MERCADO DE ÓRGÃOS HUMANOS

    OpenAIRE

    Chaparro, Germán Raúl

    2016-01-01

    Este artículo tiene como objetivo presentar los argumentos que justifican la incorporación de incentivos financieros para resolver la escasez de órganos necesarios para la realización de trasplantes. Se utiliza el análisis microeconómico convencional y al análisis simplificado del bienestar para identificar los argumentos que justifican la propuesta de crear un mercado de órganos. Se concluye que los incentivos financieros potencialmente podrían incrementar la oferta de órganos y ampliar el r...

  8. O mercado interno como patrimônio nacional

    OpenAIRE

    Nascimento, Cecilia Franco Sisternas Fiorenzo do

    2007-01-01

    Resultado do especial interesse por Direito Constitucional e da curiosidade pela profunda relação existente entre Direito, Economia e Sociedade, o trabalho foi idealizado e desenvolvido como instrumento de reflexão sobre o mercado interno, uma instituição que guarda elementos das três áreas e possibilita a convivência harmônica entre as regras e os interesses de todas elas, capaz de realizar em seu bojo os objetivos comuns e os específicos de cada uma. O objetivo da pesquisa foi, a partir ...

  9. Agricultura brasileira no Mercosul e no mercado internacional

    OpenAIRE

    Gonçalves, José Sidnei; Instituto de Economia Agrícola

    2011-01-01

    O mercado internacional vem passando por profundas mudanças no período recente, mudanças que trazem preocupações efetivas para as economias latino-americanas, em especial as do Hemisfério Sul, pois nesse cenário é mais provável que os países industrializados construam uma nova ordem mundial com base nas potências industriais do Hemisfério Norte: Estados Unidos da América (EUA), União Européia (EU) e Japão.

  10. La competitividad del aguacate mexicano en el mercado estadounidense

    OpenAIRE

    Torres Preciado, Víctor Hugo

    2009-01-01

    Resumen El objetivo de esta investigación consiste en analizar la competitividad de las exportaciones del aguacate mexicano hacia Estados Unidos. Para tal fin, se aplica el Índice de Ventaja Relativa de Exportación (VRE) y el método de Participación Constante de Mercado (CMS). Los resultados sugieren que México es altamente competitivo en las exportaciones de aguacate y que esta tendencia parece sostenerse en los próximos años. Abstract This research aims to analyze the competitiv...

  11. La competitividad del aguacate mexicano en el mercado estadounidense

    OpenAIRE

    Torres Preciado, Víctor Hugo

    2009-01-01

    Resumen El objetivo de esta investigación consiste en analizar la competitividad de las exportaciones del aguacate mexicano hacia Estados Unidos. Para tal fin, se aplica el Índice de Ventaja Relativa de Exportación (VRE) y el método de Participación Constante de Mercado (CMS). Los resultados sugieren que México es altamente competitivo en las exportaciones de aguacate y que esta tendencia parece sostenerse en los próximos años. Abstract This research aims to analyze the competitiveness of the...

  12. Exploring the plutonic crust at a fast-spreading ridge:new drilling at Hess Deep

    Energy Technology Data Exchange (ETDEWEB)

    Gillis, Kathryn M. [Univ. of Victoria, BC (Canada). School of Earth and Ocean Sciences; Snow, Jonathan E. [Univ. of Houston, Houston, TX (United States). Earth & Atmospheric Sciences; Klaus, Adam [Texas A & M Univ., College Station, TX (United States). Integrated Ocean Drilling Program (IODP). United States Implementing Organization.; Guerin, Gilles [Lamont-Doherty Earth Observatory of Columbia Univ., Palisades, NY (United States). Borehole Research Group; Abe, Natsue [Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka (Japan). Inst. for Research on Earth Evolution (IFREE); Akizawa, Norikatsu [Kanazawa Univ. (Japan). Dept. of Earth Sciences; Ceuleneer, Georges [Univ. Paul Sabatier, Toulouse (France). Observatoire Midi-Pyrenees (UMS 831), CNRS; Cheadle, Michael J. [Univ. of Wyoming, Laramie, WY (United States). Dept. of Geology and Geophysics; Adriao, Alden de Brito [Federal Univ. of Rio Grande do Sul, Porto Alegre (Brazil). Geology Inst. (IGEO); Faak, Kathrin [Ruhr Univ., Bochum (Germany). Geological Inst.; Falloon, Trevor J. [Univ. of Tasmania, Hobart, TAS (Australia). Inst. for Marine and Antarctic Studies; Friedman, Sarah A. [Southern Illinois Univ., Carbondale, IL (United States). Dept. of Geology; Godard, Marguerite M. [Univ. Montpellier II (France). Geosciences Montpellier-UMR 5243; Harigane, Yumiko [National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Marine Geology Dept.; Horst, Andrew J. [Syracuse Univ., NY (United States). Dept. of Earth Science; Hoshide, Takashi [Tohoku Univ., Sendai (Japan). Graduate School of Science; Ildefonse, Benoit [Univ. Montpellier II (France). Lab. de Tectonophysique; Jean, Marlon M. [Northern Illinois Univ., DeKalb, IL (United States). Dept. of Geology and Environmental Geosciences; John, Barbara E. [Univ. of Wyoming, Laramie, WY (United States). Dept. of Geology and Geophysics; Koepke, Juergen H. [Univ. of Hannover (Germany). Inst. of Mineralogy; Machi, Sumiaki [Kanazawa Univ. (Japan). Dept. of Earth Sciences; Maeda, Jinichiro [Hokkaido Univ., Sapporo (Japan). Dept. of Natural History Sciences; Marks, Naomi E. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Chemistry and Material Sciences Dept.; McCaig, Andrew M. [Univ. of Leeds (United Kingdom). School of Earth and Environment; Meyer, Romain [Univ. of Bergen (Norway). Dept. of Earth Science and Centre for Geobiology; Morris, Antony [Univ. of Plymouth (United Kingdom). School of Earth, Ocean & Environmental Sciences; Nozaka, Toshio [Okayama Univ. (Japan). Dept. of Earth Sciences; Python, Marie [Hokkaido Univ., Sapporo (Japan). Dept. of Earth and Planetary Sciences; Saha, Abhishek [Indian Inst. of Science (IISC), Bangalore (India). Centre for Earth Sciences; Wintsch, Robert P. [Indiana Univ., Bloomington, IN (United States). Dept. of Geological Sciences

    2013-02-28

    Integrated Ocean Drilling Program (IODP) Hess Deep Expedition 345 was designed to sample lower crustal primitive gabbroic rocks that formed at the fast-spreading East Pacific Rise (EPR) in order to test models of magmatic accretion and the intensity of hydrothermal cooling at depth. The Hess Deep Rift was selected to exploit tectonic exposures of young EPR plutonic crust, building upon results from ODP Leg 147 as well as more recent submersible, remotely operated vehicle, and near-bottom surveys. The primary goal was to acquire the observations required to test end-member crustal accretion models that were in large part based on relationships from ophiolites, in combination with mid-ocean ridge geophysical studies. This goal was achieved with the recovery of primitive layered olivine gabbros and troctolites with many unexpected mineralogical and textural relationships, such as the abundance of orthopyroxene and the preservation of delicate skeletal olivine textures.

  13. Pluton emplacement and magmatic arc construction: A model from the Patagonian batholith

    Science.gov (United States)

    Bruce, Robert; Nelson, Eric; Weaver, Stephen

    1988-01-01

    A model of batholithic construction in Andean arcs and its applicability to possibly similar environments in the past is described. Age and compositional data from the Patagonian batholith of southern Chile show a long history of magmatism in any given area (total age range is 15 to 157 Ma), but different regions appear to have different magmatic starting ages. Furthermore, mafic rocks seem to be the oldest components of any given region. An assembly line model involving semicontinuous magmatism and uplift was outlined, which has implications for other terranes: uplift rates will be proportional to observed ranges in age, and total uplift will be proportional to the age of the oldest pluton in any given area. It is suggested that misleading results would be obtained if only small areas of similar terranes in the Archean were available for study.

  14. Neogene Uplift and Exhumation of Plutonic Bodies in the Beni Bou Ifrour Massif (Nador, northeastern Morocco)

    Science.gov (United States)

    Lebret, Noëmie; Jolivet, Laurent; Branquet, Yannick; Bourdier, Jean-Louis; Jolivet, Marc; Marcoux, Eric

    2013-04-01

    In Neogene times, the whole Mediterranean Sea was the center of an intense magmatic activity. This post-collisional magmatism produced a large amount of volcanic edifices through the Alpine belts, together with some intrusives. These plutonic bodies can be associated with skarn-type mineralization, well-known in Elba Island or Serifos Island (Cyclades), where they are generally exhumed by detachment faults. In Morocco, the plutons hosted by the Beni Bou Ifrour massif are connected to the biggest skarn-type iron concentrations of the country (production > 60 Mt, reserves ≈ 25 Mt). The purpose of this work is to explain the late uplift of this massif and subsequent exhumation of the intrusives. As a final product of the Africa-Eurasia plate convergence since ca. 70 Ma, the Rif Mountains constitute the westernmost segment of the Mediterranean Alpine belts. In the oriental part of this range, volcanic summits and Paleozoic to Mesozoic massifs outcrop in the surrounding Mio-Pliocene plains. The Beni Bou Ifrour massif, in the Nador province, consists in a dome-shaped folded Mesozoic series (Domerian to Barremian) affected by a slight epizonal regional metamorphism (ca. 14-12 Ma), dislocated by Neogene NE-SW faults and eventually sealed by upper Miocene transgressive sediments. The hosted intrusives (7.58 ± 0.03 Ma; Duggen et al., 2005) are the plutonic equivalents to the potassic calc-alkaline lavas (andesites mainly) from the surrounding "satellite" volcanic massifs. They turn out to stand in higher topographic position than the younger shoshonitic lavas of the neighboring Gourougou stratovolcano (6.12 ± 0.01 Ma; Duggen et al., 2005). Previous studies have attributed this uplift to the action of normal faults (pull-apart basins; Guillemin & Houzay, 1982), thrusting (Kerchaoui, 1985; 1995) or even of a caldeira resurgence (El Bakkali, 1995). To discriminate against those exhumation mechanisms, field work has been performed, coming along with new cross-sections to

  15. Magmatic Flow Record From AMS Data La Gloria Pluton, Central Chile

    Science.gov (United States)

    Gutierrez, F.; Payacan, I. J.; Calderon, S.

    2011-12-01

    La Gloria Pluton (LGP) is a 10 Ma epizonal intrusion in the Southern Andes, located 40 km east of Santiago, in central Chile. 20 km long and 5 km wide LPG has a thickness of 2.5 km, in the form of a NW elongating inverted canoe. LGP intrudes Miocene volcanics as NS extending cluster of Miocene granitoids. LGP was emplaced at the west of an inverse fault system without exhibiting significant post-intrusion deformation. The fault system includes the Laguna Negra Fault and the El Coironal Fault, at its southern and northern ends respectively. LGP has been interpreted to have had a short cooling time, where subsolidus reequilibration was not pervasive, allowing identification of early and late magmatic conditions and suggesting it to be a single closed chamber. LGP is zoned vertically from granodiorite/quartz monzodiorite to quartz monzonite towards the roof, where hornblende and biotite and minor magnetite-ilmenite are omnipresent. AMS samples were collected at 39 sites to determine of the magnetic anisotropy susceptibility tensor. Magnetic fabric is generally oblate and anisotropy values range from 1.3 to 13.9%, consistent with the prescience magnetite and ilmenite. Magnetic lineation (ML) has a NNW trend, a subhorizontal dip and values between 0.4 and 5.3%. Magnetic foliation (MF) has a NW trend and dip varying from vertical at the walls of the intrusive to subhorizontal inside and under the roof. MF values ranges between 0.8 and 13.3%. Since linear trend of MF is restricted to the LGP interior only and can not be caused by a simple inverse fault system, we interpret the AMS results as a consequence of magmatic flow. ML represents the main flow direction, where several shallow plutons intrude at 10Ma in NW direction. MF is consequence of convection, related to cooling and differentiation, and is comparable to numerical simulations of magma fluid-dynamics during differentiation (R4). Two profiles (EW and NS) indicate that MF linear trend is from 29°/km to 50

  16. The geology and geochronology of the Belmont pluton and microgranite dykes from the Margate area

    International Nuclear Information System (INIS)

    Thomas, R.J.; Eglington, B.M.; Kerr, A.

    1990-01-01

    Field, petrographic, geochemical and Rb-Sr isotope data are presented for two granitic units which are considered to represent amongst the youngest intrusive rocks in the Natal Metamorphic Province. These are the Belmont granite pluton and a suite of unfoliated biotite microgranite dykes from the Margate area. The data suggest that these rocks do not form part of a consanguineous suite as previously envisaged. It is concluded that the Belmont pluton (1055 ± 60Ma) should be assigned to the garnet leucogranite phase of the syntectonic Margate Suite, and that the dykes (∼965 Ma) represent the products of a discrete, late-stage magmatic event which took place towards the end of the Natal orogenesis. Furthermore, the high initial Sr isotopic ratio (∼0,715) of the dykes suggests that they were derived from the melting of pre-existing radiogenic crust. The termination of major tectono-magmatic events in the Late Proterozoic Namaqua-Natal Belt apparently youngs from west to east across South Africa. Reconstructions of Gondwanaland place the Falkland Plateau and the Maudheim Province of Antarctica off the southeast of Africa. Dates obtained from this region range from ∼1000Ma to ∼500Ma, suggesting a continued decrease in age of tectono-magmatic activity eastwards. The microgranite dykes described here are unequivocally amongst the youngest post-tectono-metamorphic intrusions of southern Natal, yet they do not preserve any whole-rock indication of Pan-African isotopic disturbances. Sparse Rb-Sr mineral isotopic data support this indication that there was no significant Pan-African activity in the Natal Metamorphic Province. 8 figs., 7 tabs., 38 refs

  17. The Variscan calc-alkalic plutonism of western Corsica: mineralogy and major and trace element geochemistry

    Science.gov (United States)

    Cocherie, A.; Rossi, Ph.; Le Bel, L.

    1984-10-01

    Petrographic and structural observations on the calc-alkalic plutonism of western Corsica revealed the existence of several successively emplaced units associated with large basic bodies. The present mineralogical and geochemical study deals with the genesis, evolution and relationships of these different units. Basic plutonism is represented by three genetically linked types of rock: norites and troctolites with cumulate textures characterized by low REE contents and either no Eu anomaly or a positive Eu anomaly; gabbros with enriched LREE relatively to HREE patterns, probably close to an initial basaltic liquid; and diorites ranging up to charnockites which represent liquids evolved to varying degrees, mainly by fractional crystallization. Trace element data and studies on the evolution of pyroxene pairs demonstrate the consanguinity of these calc-alkaline basic rocks which are derived from a high alumina basaltic melt. The various granitoids (granodiorites, monzogranites and leucocratic monzogranites, i.e., adamellites) have distinct evolution trends as shown by the composition of their mafic minerals and by trace element distributions. They cannot be considered as being derivatives of the basic suite and they cannot be related by a common fractionation sequence. Rather, they represent distinctive batches of crustal anatexis. In addition, hybridization phenomena with the basic melt are noticed in granodiorites. The particular problem of the low La/Yb, Eu/Eu∗ and the high U, Th, Cs leucocratic monzogranites is discussed in detail. In addition to more conventional trace element diagrams, the simultaneous statistical treatment of all the geochemical data by correspondence factor analysis is shown to be a very use tool in distinguishing between the different units and to classify the elements according to their geochemical properties.

  18. U-Pb geochronology of Gangdese (Transhimalaya) plutonism in the Lhasa-Xigaze region, Tibet

    International Nuclear Information System (INIS)

    Schaerer, U.; Allegre, C.J.; Paris-6 Univ., 75; Paris-7 Univ., 75; Xu, R.H.

    1984-01-01

    A series of different plutons from the Lhasa-Xigaze segment of the Gangdese (Transhimalaya) belt has been studied by high-resolution U-Pb analyses of zircon (using zircon fractions of 5-100 grains each, selected upon specific grain characteristics). For two diorites, located east of Xigaze (Dazhuka), the zircons yield concordant ages of 93.4 +- 1.0 and 94.2 +- 1.0 m.y., respectively. Also concordant ages of 41.1 +- 0.4 and 41.7 +- 0.4 m.y. have been obtained for two granodiorites, collected southwest of Lhasa (Qushui). The precision on the ages of two granites from the Xigaze and Lhasa area, is limited by two factors: the presence of inherited radiogenic lead and the occurrence of subsequent lead loss. However, some concordant zircons, detected in both granites, define approximate ages of about 67 and 53 m.y., respectively. The inherited lead components show the melting of Precambrian material was involved in magma genesis. The U-Pb ages substantiate a magmatic activity lasting from mid-Cretaceous (Cenomanian) to Eocene (Lutetian) time. Such a period of plutonism at the southern margin of Eurasia, as well as the occurrence of magma generation from continental crust, suggest that the Gangdese range results from the subduction of Tethys oceanic lithosphere (Indian plate) underneath Eurasia (Eurasian plate). If this model is true, the collision of India with Eurasia (Along the Lhasa-Xigaze sector) postdates the emplacement of the 41 m.y. old Gangdese granodiorites, i.e. the collision occurred after Lutetian time. (orig.)

  19. Metamorphism and plutonism around the middle and south forks of the Feather River, California

    Science.gov (United States)

    Hietanen, Anna Martta

    1976-01-01

    The area around the Middle and South Forks of the Feather River provides information on metamorphic and igneous processes that bear on the origin of andesitic and granitic magmas in general and on the variation of their potassium content in particular. In the north, the area joins the Pulga and Bucks Lake quadrangles studied previously. Tectonically, this area is situated in the southern part of an arcuate segment of the Nevadan orogenic belt in the northwestern Sierra Nevada. The oldest rocks are metamorphosed calcalkaline island-arc-type andesite, dacite, and sodarhyolite with interbedded tuff layers (the Franklin Canyon Formation), all probably correlative with Devonian rocks in the Klamath Mountains. Younger rocks form a sequence of volcanic, volcaniclastic, and sedimentary rocks including some limestone (The Horseshoe Bend Formation), probably Permian in age. All the volcanic and sedimentary rocks were folded and recrystallized to the greenschist facies during the Nevadan (Jurassic) orogeny and were invaded by monzotonalitic magmas shortly thereafter. A second lineation and metamorphism to the epidote-amphibolite facies developed in a narrow zone around the plutons. In light of the concept of plate tectonics, it is suggested that the early (Devonian?) island-arc-type andesite, dacite, and sodarhyolite (the Franklin Canyon Formation) were derived from the mantle above a Benioff zone by partial melting of peridotite in hydrous conditions. The water was probably derived from an oceanic plate descending to the mantle. Later (Permian?) magmas were mainly basaltic; some discontinuous layers of potassium-rich rhyolite indicate a change into anhydrous conditions and a deeper level of magma generation. The plutonic magmas that invaded the metamorphic rocks at the end of the Jurassic may contain material from the mantle, the subducted oceanic lithosphere, and the downfolded metamorphic rocks. The ratio of partial melts from these three sources may have changed with time

  20. Geochemistry of mylonitic tourmaline-bearing granite- gneiss pluton in the northeast of June mine

    Directory of Open Access Journals (Sweden)

    Arezoo Moradi

    2017-07-01

    Full Text Available Introduction Studied mylonitic granite-gneiss body is located in the Northwest of the Azna region in the Lorestan province close to the June dimension stone mine. It is a part of the metamorphic- magmatic complex including granite-gneiss, amphibolite, marble and schist. The crystalline basement is attributed to late-Neoproterozoic and it indicates a Panafrican basement, which yields a laser-ablation ICP–MS U–Pb zircon ages of 608 ± 18 Ma and 588 ± 41 Ma (Shakerardakani et al., 2015. There are two granite-gneiss plutons in the complex that are Galeh– Dezh (Shabanian et al., 2009, and June plutons. The Galeh-Doz pluton are previously proposed as syn-deformation pluton with a major S-shaped bend which has been imparted during dextral shearing with a Late Cretaceous (Mohajjel and Fergusson, 2000. However, new age dating on the pluton using U–Pb in the magmatic zircon produced the late-Neoproterozoic dates (Nutman et al., 2014; Shakerardakani et al., 2015. The granite-gneiss plutons show mylonitic fabrics and microstructures (Shabanian et al., 2010. The geochemical characteristics of mylonitic granite-gneiss body near June mine in NW Azna, is in the focus of our research. Materials and methods Petrographic investigations of 30 thin sections were made. Then eight samples were selected and analyzed for whole rock major, trace and REE compositions by ICP-emission spectrometry and ICP-mass spectrometry using natural rock standards as reference samples for calibration at the ACME Analytical Laboratories in Vancouver, British Columbia, Canada. Results The studied gneiss- granitic body has lepido-granoblastic texture as its major texture. It variably shows evidence of dynamic deformation from ultramylonite to protomylonite. The gneiss- granite consists of quartz, alkali feldspar (mostly as perthite, plagioclase, biotite, white mica (muscovite and phengitic muscovite. Accessory phases in the granitoid include, tourmaline, zircon, magmatic epidote

  1. Petrology of the Porriño late-Variscan pluton from NW Iberia. A model for post-tectonic plutons in collisional settings

    Energy Technology Data Exchange (ETDEWEB)

    González Menéndez, L.; Gallastegui, G.; Cuesta, A.; Montero, P.; Rubio-Ordoñez, A.; Molina, J.F.; Bea, F.

    2017-07-01

    The Variscan orogen of NW Iberia contains abundant syn- and post-tectonic granitoids. The post-tectonic granitoids are metaluminous to slightly peraluminous, I-type granites, monzogranites ± granodiorites ± tonalites. The Porriño pluton studied here is a representative example. It consists of two units: i) a pink-red, peraluminous, biotite granite and ii) a gray, metaluminous to peraluminous, biotite (± amphibole ± titanite) monzogranite, including maficintermediate enclaves. SHRIMP U-Pb dating yielded 290-295Ma ages for all the units. The mineralogy and geochemistry show that the pink-red granite has features of I- and A-type granites, whereas the gray monzogranite and enclaves are I-types. Sr isotopes show scattered values for the pink-red granite (87Sr/86Sr295Ma ≈ 0.702-0.710) and uniform values for the gray monzogranite and enclaves (87Sr/86Sr295Ma≈ 0.705-0.706). Geochemical results indicate a peritectic entrainment of clinopyroxene + orthopyroxene ± Ca-plagioclase ± ilmenite ± garnet, and minor accessory phases (± zircon ± titanite ± apatite) into a melt similar to the leucocratic gray monzogranite. A mafic-intermediate source is proposed for the gray monzogranite and its enclaves. Restitic protoliths generated granitic melts with A-type features such as the pink-red granite. The I-type nature of many post-tectonic granitoids could be explained by the previous extraction of S-type syn-tectonic granites that left restites and less fertile rocks. Late orogenic new melting affected the previously unmelted and more mafic lithologies of the lower-middle crust, and gave rise to I-type granitoids. Repeated melting events affecting such lithologies and previous restites could have generated granitic melts with A-type features.

  2. MERCADO FUTURO DE CAFÉ : UM ESTUDO DE CASO.

    Directory of Open Access Journals (Sweden)

    TÁCITO AUGUSTO FARIAS

    2014-08-01

    Full Text Available Resumo: O café é a commodity agrícola brasileira que possui o mercado mais desenvolvido, dentre os contratos negociados na Bolsa de Mercadorias e Futuros (BM&F é o que apresenta negociações em maior volume, além de apresentar maiores volatilidades, tornando as operações de hedge uma importante ferramenta para diminuição de riscos para quem participa desse mercado. Realizando o hedge, o produtor acaba eliminando totalmente o risco de variação do preço só que passa a lidar o risco de variação de base. Deste modo, objetivou-se identificar o modelo mais adequado à análise do risco de base do café por meio dos índices Esalq e BM&F Os resultados empíricos sugerem a necessidade de modelagem da série pelo modelo ARIMA (Autorregressivo – Integrado – Média Móvel. Também foram utilizados os resultados da estatística U-Theil, que apresentam bons indicadores para fins de previsão.

  3. Prueba de sesgo sobre rendimientos financieros en el mercado colombiano

    Directory of Open Access Journals (Sweden)

    Marisol Valencia

    2014-01-01

    Full Text Available La caracterización de los rendimientos financieros depende, en gran medida, de su comportamiento probabilístico, el cual puede ser mal ajustado, conduciendo así a malas decisiones económicas relacionadas con valoración de activos, asignación de cartera y/o medición del riesgo de mercado. En este trabajo se propone una prueba que permita determinar el ajuste de los rendimientos del Índice General de la Bolsa de Valores de Colombia (IGBC a las siguientes distribuciones: Normal, Normal Sesgada y T Sesgada. Además, se mide el nivel de sesgo y se compara el desempeño de la prueba propuesta con otra prueba existente, usada únicamente para la detección de asimetría. Se encuentra que la prueba propuesta permite caracterizar los rendimientos del mercado de valores colombiano con una de las distribuciones de probabilidad, a diferencia de la otra prueba, que sólo advierte sobre la existencia de sesgo y no establece la distribución que representa su comportamiento.

  4. ANÁLISIS INTRODUCTORIO AL MERCADO DUAL DE TRABAJO

    Directory of Open Access Journals (Sweden)

    Julio Cesar Riascos

    2007-07-01

    Full Text Available En el artículo se examina el fenómeno de la informalidad a la luz del modelo dual del mercado de trabajo. Con ese objetivo, se ilustra al lector, cómo a partir de la dinámica suscitada en el sector formal de la economía laboral, se desprenden efectos simultáneos en la plataforma informal de trabajo. En particular, se estudia el impacto de un incremento en los salarios reales, ambos casos a través de una externalidad originada en acciones de política económica gubernamental; a juzgar por sus efectos, se conviene la existencia de un estrecho vínculo entre las dos partes a través de sus interacciones; en ese mismo sentido, se reconoce la trascendencia del mercado informal en el sostenimiento de la tesis neoclásica de pleno empleo y, se advierte como tarea indispensable la redefinición del concepto de formalidad y subempleo, dadas por supuesto sus implicaciones, esta última parte posibilita estructurar una crítica social al modelo.

  5. ORDEN MONETARIO DE LAS ECONOMÍAS DE MERCADO

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    Michel Aglietta

    Full Text Available Al explicar el mercado a partir de la institución monetaria y no al revés, como es costumbre en los economistas, este artículo ofrece una nueva visión para comprender la naturaleza del dinero, las condiciones de viabilidad de la sociedad de mercado, el origen y control de las crisis financieras y monetarias y finalmente, tratar la independencia del Banco Central como una organización institucional particular que se propone para la regulación del sistema cada día más globalizado.In explaining the market takinq as a starting point the monetary institution and not the contrary, as most economists usually do, this article offers a new approach in arder to understand the nature of money, the conditions for the viability of a market society, the origin and control of financial and monetary crisis and, finally, to understand the independence of the Central Bank as a particular institutional organization that is proposed in order to regulate a system that is progressively more globalized.

  6. ¿Qué tan verde es tu mercado?

    Directory of Open Access Journals (Sweden)

    Wilmar R. Olaya-González

    2011-01-01

    Full Text Available El mercado de lo verde y lo ecológico es una tendencia indiscutible en nuestro mundo globalizado, que busca de alguna manera resarcir el daño infringido sobre el medio ambiente. Más allá de simple altruismo, la ecología se ha convertido en una moda, de la cual unos y otros toman ventaja a su mejor acomodo, haciendo del mercado de productos y servicios su tribuna; eco-diseño, planes de responsabilidad social y ambiental, campañas por el reciclaje y consumo de productos "más amigables" con el medio ambiente hacen parte del panorama que se intenta describir en esta reseña. Por medio de un estudio de caso, se hará énfasis en cómo la comunicación asume un papel crucial en la verdadera apropiación del concepto de "consumidor verde" y "consumidor responsable", de manera que la propuesta transversal de las tic se convierta en una herramienta no solo tecnológica, sino también de empoderamiento del papel que la sociedad puede representar en el cuidado de los recursos naturales.

  7. LOS 'PIROBOS': NOMADAS EN EL MERCADO DEL DESEO

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    Carlos Iván García Suárez

    1999-01-01

    Full Text Available El artículo intenta comprender el nomadismo de los tránsitos y devenires recurrentes de niños y jóvenes varones prostituidos, respecto de sus identidades sexual y social, de sus relaciones con el hábitat de la calle y con sus habitantes, y de sus localizaciones y desplazamientos estratégicos de mercado; se pregunta también por los recorridos vitales y espaciales de los clientes. Busca, en suma, revelar la racionalidad de la errancia que posibilita el encuentro de la oferta y la demanda en el mundo de la prostitución masculina, que harto nos dice sobre ajuste a las normas y puntos de fuga, sobre los márgenes por los que el deseo transita.

  8. El mercado de la telefonía celular

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    Mauro Flórez Calderón

    1993-07-01

    Full Text Available Las fuerzas del mercado, son indiscutiblemente, unos de los factores dinamizadores por excelencia de la ingeniería en su conjunto, conscientes de lo anterior, presentamos en este artículo el resultado de una larga investigación, dificultada por las pocas y muy celosamente custodiadas fuentes de información, debido a los enormes intereses vinculados con la prestación del servicio móvil celular en Colombia. Hemos condensado al máximo la presentación de los resultados, para que sirvan como marco de referencia justificador de la necesidad social de insertar estos últimos desarrollos tecnológicos, en los planes de estudio de la ingeniería, debido al enorme interés, y las grandes posibilidades que tienen para Colombia.

  9. Efeitos dos choques fiscais sobre o mercado de trabalho brasileiro

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    Diogo Baerlocher Carvalho

    2013-06-01

    Full Text Available Esse trabalho tem por objetivo entender quais os efeitos dos choques fiscais sobre o mercado de trabalho brasileiro. Em particular, utiliza se uma abordagem SVAR para avaliar esses efeitos sobre o emprego e o salário real. Os choques fiscais são identificados a partir da imposição de restrições de sinais puras sobre a relação dinâmica entre os gastos do governo, o produto real e a oferta de trabalho. As restrições são obtidas a partir de funções de resposta a impulso Bayesianas derivadas de um modelo DSGE na tradição da Nova Síntese Neoclássica. As funções de resposta a impulso obtidas a partir da abordagem SVAR mostram que choques fiscais aumentam o salário real e o emprego.

  10. En busca de un posicionamiento de mercado: Modelo de Mercadotecnia

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    Nancy Imelda Montero Delgado

    2016-03-01

    Full Text Available Esta investigación nace con la finalidad de identificar las variables que inciden en el diseño efectivo de una estrategia de mercadotecnia, de tal forma que el empresario implemente acciones que lo lleven a mejorar la posición en el mercado y su reflejo en el nivel de ventas. Para esto, se observan los modelos que han intentado explicar la efectividad de la mercadotecnia en el tiempo; partiendo así del modelo de Kotler (1977 y se integran los hallazgos identificados en otros modelos, así como la inserción de una variable adicional que pretende explicar con mayor claridad el nivel de mercadotecnia que emplea la empresa. Como resultado se propone un modelo aplicable a la mipyme a través del cual el empresario identifica en forma clara y sencilla el nivel de mercadotecnia con el que trabaja y su efectividad

  11. commodity: el caso del mercado internacional del azúcar

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    Julio César Alonso

    2013-01-01

    Full Text Available Este trabajo estudia el comportamiento estacional de los precios internacionales del azúcar transados en Nueva York y Londres. Para este caso, empleando pruebas de raíces estacionales y una muestra mensual desde enero de 1989 hasta diciembre de 2010, se encuentra la existencia de un comportamiento estacional estocástico no estacionario. Dicha conducta implica que un “verano” se puede convertir en un “invierno”, resultado que no había sido documentado previamente en estos mercados. Por otro lado, empleando dicho hallazgo, los resultados muestran que es posible construir un modelo autorregresivo de media móvil que se comporta relativamente mejor al pronosticar el precio frente a un modelo que no tiene en cuenta dicho tipo de estacionalidad.

  12. K, Rb and Sr abundances and Sr isotopic composition of the Tanzawa granitic and associated gabbroic rocks, Japan: low-potash island arc plutonic complex

    International Nuclear Information System (INIS)

    Ishizaka, K.; Yanagi, T.

    1977-01-01

    The granitic and associated gabbroic rocks of the Tanzawa plutonic complex of Miocene age occurring in the northern part of the Izu-Bonin arc are characterized by low abundances of K (229-6790 ppm) and Rb (0.414-12.1 ppm), low K 2 O/Na 2 O ratios (0.037-0.21), moderately high K/Rb ratios (541-630), low Rb/Sr ratios (0.00137-0.0579) and low initial 87 Sr/ 86 Sr ratios (0.70332-0.70372). This indicates that acid to intermediate plutonic rocks with these geochemical characteristics also occur in island arc environments besides mid-oceanic ridge environments. They represent, together with associated gabbroic rocks, a low-potash island arc plutonic complex and are expected to occur beneath young island arcs, although now unexposed. The Tanzawa plutonic complex may have been formed by differentiation of low-K calc-alkaline magma. (Auth.)

  13. Composition of coarse-grained magnetite from pegmatite dikes related to plutons of quartz monzonite in the Jabal Lababa area, Kingdom of Saudi Arabia

    Science.gov (United States)

    Overstreet, William C.; Mousa, Hassan; Matzko, John J.

    1985-01-01

    Crystals of magnetite as large as 30 mm long and 7 mm thick are locally present in quartz-rich zones of interior and exterior pegmatite dikes related to plutons of quartz monzonite in the Jabal Lababa area. Niobium, tin, and yttrium are strongly enriched in six specimens of magnetite from interior pegmatite dikes in a small pluton where these elements form geochemical anomalies in nonmagnetic heavy-mineral concentrates from wadi sediment. Less abundant anomalous elements in the magnetite are molybdenum, lead, and zirconium, which also tend to be present in anomalous amounts in the nonmagnetic concentrates from the niobium-bearing pluton. The most anomalous trace element in the magnetite is zinc, which is at least 10 times as abundant as it is in the quartz monzonite plutons or in the nonmagnetic concentrates. The capacity of magnetite to scavenge molybdenum, zinc, niobium, lead, tin, yttrium, and zirconium suggests the possible utility of magnetite as a geochemical sample medium.

  14. Evidence of recent plutonic magmatism beneath Northeast Peloponnesus (Greece) and its relationship to regional tectonics

    Science.gov (United States)

    Tzanis, A.; Efstathiou, A.; Chailas, S.; Stamatakis, M.

    2018-03-01

    This work reports evidence of recent tectonically controlled plutonic magmatism related to Neogene volcanism in a broad area of Northeast Peloponnesus (Greece) that is straddled by the Hellenic Volcanic Arc and comprises the Argolid, the Argolic and Saronic gulfs and eastern Corinthia including the province of Crommyonia at the western half of Megaris peninsula (western Attica). We assess the contemporary stress field based on formal inversion of well-constrained crustal earthquake focal mechanisms and determine that it is principally extensional and NE-SW oriented, with σ1 strike and plunge being N64° and 77°, respectively and σ3 strikes and plunge N210° and 10°. This generates WNW-ESE and NW-SE faults, the former being dominant in the Saronic Gulf and the latter in the Argolic. In addition, the analysis predicts E-W and N330° faults with non-trivial right- and left-lateral heave, respectively, which are consistent with the R and R΄ directions of Riedel shear theory and explain a number of observed earthquake focal mechanisms and earthquake epicentre alignments. We also present a semi-quantitative analysis of observed aeromagnetic anomalies by performing numerical modelling of the radially averaged power spectrum with an efficient anomaly separation scheme based on a new type of 2-D Fourier domain filter introduced herein, the Radial Extended Meyer Window. This analysis identifies an extensive complex of magnetized rock formations buried at depths greater than 3 km which, given the geology and geotectonic setting of the area, can hardly be explained with anything other than calc-alkaline intrusions (plutons). At northeastern Corinthia and Crommyonia, this type of intrusive activity is unexceptional, mainly concentrated in the Gulf of Megara-Sousaki areas and consistent with the low-intensity, small-scale Pliocene dacitic volcanism observed therein. Conversely, large-scale elongate anomalies of E-W and N330° orientation have been identified in the Argolid

  15. EMPREENDEDORISMO JOVEM: DA ESCOLA PARA O MERCADO DE TRABALHO

    Directory of Open Access Journals (Sweden)

    Danilo Cortez Gomes

    2014-11-01

    Full Text Available O empreendedorismo jovem apresenta-se como forma de inclusão de jovens no mercado de trabalho e em contrapartida é fator preponderante para promoção do desenvolvimento socioeconômico brasileiro (LIMA-FILHO, SPROESSER, MATINS, 2009. Nesta perspectiva, o objetivo central desse artigo é discutir o ensino do empreendedorismo para os jovens utilizando como “case” o projeto “Empreendedorismo jovem: da escola para o mercado de trabalho” que buscou estimular os alunos do IFRN – Campus Currais Novos quanto à criação de novos negócios relacionados às suas áreas de formação técnica (alimentos e informática, através de uma série de atividades (visitas a empresas dos ramos de informática e alimentos; workshops e palestras; evento; seminários. Esse projeto buscou preencher uma lacuna muitas vezes encontrada no Campus quanto ao conhecimento prático das ações relacionadas à gestão empresarial e criação de novos negócios, bem como da participação mais efetiva das empresas nos eventos da instituição, como forma de dá oportunidade para que estes conheçam as potencialidades existentes nos cursos de informática e alimentos. Além do mais, os trabalhos desenvolvidos no projeto possibilitaram o despertar desses alunos quanto à criação de empresas. O projeto teve duração de sete meses, nos quais as diversas ações foram realizadas paulatinamente.

  16. El mercado hipotecario y el financiamiento de la vivienda

    Directory of Open Access Journals (Sweden)

    Gustavo A. Salas Rada

    2010-07-01

    Full Text Available El financiamiento a la vivienda en Colombia ha alcanzado en los últimosaños un significativo desarrollo. Para ello ha sido fundamental la configuración de tres elementos complementarios: 1 la eliminación del efecto de la inflación sobre el valor de las deudas de largo plazo, primero por la vía de desarrollar una unidad de cuenta indexada a la inflación, que sea creíble y transparente (la UVR y, posteriormente, con el abatimiento de la inflación como fenómeno macroeconómico; 2 la reforma al régimen de financiación con la expedición de la Ley 546/99, que fue clave para el nacimiento y progreso de un mercado de títulos hipotecarios, y 3 la política social de vivienda, según la cual el Estado se ha ido moviendo progresivamente, aunque tal vez con lentitud, hacia el subsidio de la demanda de vivienda de los grupos con más dificultades de acceso a los mercados privados de financiamiento. Los cambios en el entorno macroeconómico, en la legislación de la construcción y la categórica definición de un derecho a la vivienda digna comprometen al Estado colombiano a diseñar estrategias para responder al mandato constitucional, pues los esfuerzos no han sido de impactos significativos, y la política de financiamiento ha presentado fluctuaciones que han afectado su efectividad.

  17. La Red: el nuevo mercado de la vida privada

    Directory of Open Access Journals (Sweden)

    Lic. María Teresa Sandoval Martín

    2001-01-01

    Full Text Available Mientras el mercado publicitario en Internet demanda cada vez más información de los ciberusuarios, diferentes organizaciones y determinados gobiernos defienden el respeto a la intimidad y a la privacidad en el nuevo entorno tecnológico. Algunos de estos países proponen leyes y otros prefieren la autorregulación, pero, a la vez, también se van incrementando las medidas y los sistemas de vigilancia con el supuesto fin de proteger a la sociedad. Además de la regulación, las normas o el desarrollo de códigos por las empresas, el mercado e incluso la propia tecnología pueden limitar la información que se toma de los navegantes de la red de redes. La mayoría de los especialistas consideran que en un futuro próximo los internautas deseos de discreción pagarán un precio por la seguridad de sus datos, mientras que los otros verán su intimidad ofrecida como mercancía.ABSTRACTWhile market in Internet demands more and more information about users, different organizations and certain governments defend the respect to the intimacy and the privacy in the new technological environment. Some of these countries propose laws and others lean for a self-regulation. At the same time, they also leave increasing the measures and systems of surveillance with the supposed end of protecting to society. Besides the regulation, the rules or the development of codes for the companies, the market and the own technology can even limit the information of users in the net. Most of the specialists consider that in a next future, some of the users will pay a price for the security of their data, while the other ones will see their intimacy offered as a merchandise.

  18. Requerimientos para formular estrategias orientadas al mercado del sector hotelero

    Directory of Open Access Journals (Sweden)

    Rafael Hernández-León

    2016-12-01

    Full Text Available Las pequeñas y medianas empresas son eslabones fundamentales para que las economías de las naciones crezcan y se vuelvan competitivas. Un elemento clave en el rendimiento de las organizaciones es la implementación de estrategias para crear ventaja competitiva. El objetivo de este trabajo fue determinar los requerimientos para formular estrategias en orientación al mercado en los hoteles del estado de Sonora. La metodología consistió en aplicar una encuesta a los encargados de mercadotecnia de los hoteles, investigar el entorno y determinar los requerimientos por medio de un análisis de las principales interacciones de los elementos: fortalezas, oportunidades, debilidad y amenazas. El instrumento para recolectar los datos se validó por medio de un análisis factorial. Entre los principales hallazgos se encontró una baja capacitación del personal, poco uso de herramientas tecnológicas, y falta de comunicación interfuncional. Se concluye que es necesario realizar un seguimiento en los programas de capacitación, optimizar el uso de herramientas tecnológicas, y mejorar la vinculación de las empresas con las universidades y el gobierno. Finalmente, a diferencia de otros estudios encontrados en la literatura, los cuales se enfocan a determinar estrategias, en ésta investigación se obtuvieron los requerimientos para mejorar la orientación al mercado, y que cada empresa los utilice para formular sus propias estrategias.

  19. Mercado inmobiliario y orden residencial metropolitano en Bogotá

    Directory of Open Access Journals (Sweden)

    Óscar A Alfonso

    2012-05-01

    Full Text Available Las actuales mayores necesidades residenciales metropolitanas se han suscitado principalmente por la modificación de las relaciones de parentesco, que han dado lugar a un aumento en las jefaturas de hogar y la consecuente contracción del tamaño promedio de los hogares. Junto con el avance de las políticas de desalarización de la economía metropolitana, el mercado inmobiliario de la residencia nueva en Bogotá produce un incremento en el stock que no atiende satisfactoriamente los dos grandes desafíos que representan la densificación urbana y la producción de un orden residencial metropolitano menos segregado. El ajuste espacial del mercado formal se apoya tanto en la reducción de las áreas residenciales para hogares de bajos ingresos como en su localización periférica, lo que implica mayor hacinamiento y más altos costos de transporte para sus miembros.The increase in metropolitan residential needs has arisen mainly from changing family relationships resulting in an increase in household headships and the ensuing contraction of their average size. Amid the advancement of "desalarization" labor policies in the metropolitan economy, the housing market of new residences in Bogotá has produced an increase in the residential stock that does not cover sufficiently the major challenges presented by urban densification, and by the production of a less segregated metropolitan residential order. Theformal market's spatial adjustment is based both on the reduction of residential areas for low-income households, and their peripheral location, which implies an increase in overcrowding and transportation costs for their members.

  20. An evolving tectonic environment of Late Carboniferous to Early Permian granitic plutons in the Chinese Altai and Eastern Junggar terranes, Central Asian Orogenic Belt, NW China

    Science.gov (United States)

    Zhang, Chen; Liu, Dongdong; Luo, Qun; Liu, Luofu; Zhang, Yunzhao; Zhu, Deyu; Wang, Pengfei; Dai, Quanqi

    2018-06-01

    The Central Asian Orogenic Belt (CAOB) represents one of the most important sites of juvenile crustal growth during the Phanerozoic. Located in the central part of the CAOB, the Chinese Altai and Eastern Junggar terranes record the collisional processes between the peri-Siberian and Kazakhstan orogenic systems. However, the precise timing of collision between the two terranes remains controversial. The Wukuli and Kadelat plutons in the Chinese Altai belt are dated at ∼305 and ∼280 Ma respectively, whereas the Aketas pluton in the Eastern Junggar terrane is dated at ∼308 Ma. Granites from the Wukuli and Kadelat plutons are strongly peraluminous (A/CNK > 1.1), and are characterized by low Al2O3, Na2O, MnO, MgO, CaO and heavy rare earth element (HREE) contents, but with high SiO2, K2O and Rb contents as well as high Rb/Sr ratios. Granites from the Wukuli pluton have low εNd(t) and εHf(t) values of -3.7 to -3.4 and -9.7 to +4.9, whereas those from the Kadelat pluton have values of -3.6 to -3.4 and -8.0 to +2.6. These features suggest S-type affinity for the Wukuli and Kadelat plutons with magma derivation through partial melting of Mesoproterozoic metasediments. The Aketas pluton is composed of weakly peraluminous quartz monzonites that have A/CNK values ranging from 0.92 to 1.08, with high Na2O, Sr, and Sr/Y, and low Y, Yb, Nb, and Ta. These rocks display positive εNd(t) (+4.8 to +6.4) and εHf(t) (+9.7 to +14.6) values, and low initial 87Sr/86Sr ratios (0.703357-0.703868), similar to modern adakites, suggesting that the quartz monzonites were derived from the partial melting of lower crustal material. The geochemical characteristics suggest that the Aketas pluton was formed in a subduction-related setting, the Wukuli pluton in a syn-collisional setting, and the Kadelat pluton in the subsequent post-orogenic strike-slip-related setting. In combination with data from other granitoids in these two terranes, the Aketas pluton represents the youngest record of

  1. The Jeffers Brook diorite-granodiorite pluton: style of emplacement and role of volatiles at various crustal levels in Avalonian appinites, Canadian Appalachians

    Science.gov (United States)

    Pe-Piper, Georgia; Piper, David J. W.

    2018-04-01

    Small appinite plutons ca. 610 Ma outcrop in the peri-Gondwanan Avalon terrane of northern Nova Scotia, with different structural levels exposed. Field mapping shows that the Jeffers Brook pluton is a laccolith emplaced along an upper crustal thrust zone, likely in a dilational jog in a regional dextral strike-slip system. The oldest rocks are probably mafic sills, which heated the area facilitating emplacement of intermediate magmas. Cross-cutting relationships show that both mafic and intermediate magmas were supplied throughout the history of pluton emplacement. The modal composition, mineral chemistry, and bulk chemistry of gabbro, diorite, tonalite, granodiorite, and granite have been studied in the main plutonic phases, dykes, and sills, and mafic microgranular enclaves. As with the type appinites in the Scottish Caledonides, the pluton shows evidence of high water content: the dominance of hornblende, locally within pegmatitic texture; vesicles and irregular felsic patches in enclaves; and late aplite dykes. Analyzed mafic microgranular enclaves are geochemically similar to larger diorite bodies in the pluton. Tonalite-granodiorite is distinct from the diorite in trace-element geochemistry and radiogenic isotopes. Elsewhere to the east, similar rocks of the same age form vertically sheeted complexes in major shear zones; hornblende chemistry shows that they were emplaced at a deeper upper crustal level. This implies that little of the observed geochemical variability in the Jeffers Brook pluton was developed within the pluton. The general requirements to form appinites are proposed to be small magma volumes of subduction-related magmas that reach the upper crust because of continual heating by mafic magmas moving through strike-slip fault pathways and trapping of aqueous fluids rather than venting through volcanic activity.

  2. The distribution, geochronology and geochemistry of early Paleozoic granitoid plutons in the North Altun orogenic belt, NW China: Implications for the petrogenesis and tectonic evolution

    Science.gov (United States)

    Meng, Ling-Tong; Chen, Bai-Lin; Zhao, Ni-Na; Wu, Yu; Zhang, Wen-Gao; He, Jiang-Tao; Wang, Bin; Han, Mei-Mei

    2017-01-01

    Abundant early Paleozoic granitoid plutons are widely distributed in the North Altun orogenic belt. These rocks provide clues to the tectonic evolution of the North Altun orogenic belt and adjacent areas. In this paper, we report an integrated study of petrological features, U-Pb zircon dating, in situ zircon Hf isotope and whole-rock geochemical compositions for the Abei, 4337 Highland and Kaladawan Plutons from north to south in the North Altun orogenic belt. The dating yielded magma crystallization ages of 514 Ma for the Abei Pluton, 494 Ma for the 4337 Highland Pluton and 480-460 Ma for the Kaladawan Pluton, suggesting that they are all products of oceanic slab subduction because of the age constraint. The Abei monzogranites derived from the recycle of Paleoproterozoic continental crust under low-pressure and high-temperature conditions are products of subduction initiation. The 4337 Highland granodiorites have some adakitic geochemical signatures and are sourced from partial melting of thickened mafic lower continental crust. The Kaladawan quartz diorites are produced by partial melting of mantle wedge according to the positive εHf(t) values, and the Kaladawan monzogranite-syenogranite are derived from partial melting of Neoproterozoic continental crust mixing the juvenile underplated mafic material from the depleted mantle. These results, together with existing data, provide significant information about the evolution history of oceanic crust subduction during the 520-460 Ma. The initiation of subduction occurred during 520-500 Ma with formation of Abei Pluton; subsequent transition from steep-angle to flat-slab subduction at ca.500 Ma due to the arrival of buoyant oceanic plateaus, which induces the formation of 4337 Highland Pluton. With ongoing subduction, the steep-angle subduction system is reestablished to cause the formation of 480-460 Ma Kaladawan Pluton. Meanwhile, it is this model that account for the temporal-spatial distribution of these early

  3. A paleomagnetic and stable isotope study of the pluton at Rio Hondo near Questa, New Mexico: Implications for CRM related to hydrothermal alteration

    International Nuclear Information System (INIS)

    Hagstrum, J.T.; Johnson, C.M.

    1986-01-01

    Paleomagnetic and rock magnetic data combined with stable isotope data from the middle Tertiary pluton along the Rio Hondo in northern New Mexico suggest that its magnetic remanence has both thermal (TRM) and high-temperature chemical (CRM) components. Oxygen isotope temperatures indicate that magnetite associated with the more rapidly cooled higher levels of the pluton, and with mafic inclusions and cogenetic rhyolitic dikes sampled at lower levels of exposure, ceased subsolidus recrystallization and isotopic exchange above its Curie temperature (580 0 C) in the presence of a magmatic fluid. Continued cooling imparted a TRM to these portions of the pluton. The more slowly cooled granodiorite at lower levels has quartz-magnetite isotopic temperatures that are below the Curie temperature of magnetite implying that its magnetization is high-temperature CRM. Sub-Curie isotopic temperatures for other granitic plutons in the western U.S.A. suggest that CRM may be commonly derived from subsolidus interactions between magnetite and magmatic fluids in plutonic rocks. A meteoric-hydrothermal system generated by the cooling Rio Hondo pluton, and not by younger adjacent intrusions, resulted in limited alteration along zones of high permeability near the southern margin of the Rio Hondo pluton, and in more prevasive alteration of the pluton to the north. The meteoric-hydrothermal alteration occurred at relatively high temperatures (>350 0 C) and, with the exception of local chloritization, caused little visible alteration of the rocks. The isotopic ratios indicate that little of the magnetite could have grown from or exchanged with a meteoric-hydrothermal fluid. (orig.)

  4. Paleomagnetic and stable isotope study of the pluton at Rio Hondo near Questa, New Mexico: Implications for CRM related to hydrothermal alteration

    Energy Technology Data Exchange (ETDEWEB)

    Hagstrum, J T; Johnson, C M

    1986-06-01

    Paleomagnetic and rock magnetic data combined with stable isotope data from the middle Tertiary pluton along the Rio Hondo in northern New Mexico suggest that its magnetic remanence has both thermal (TRM) and high-temperature chemical (CRM) components. Oxygen isotope temperatures indicate that magnetite associated with the more rapidly cooled higher levels of the pluton, and with mafic inclusions and cogenetic rhyolitic dikes sampled at lower levels of exposure, ceased subsolidus recrystallization and isotopic exchange above its Curie temperature (580/sup 0/C) in the presence of a magmatic fluid. Continued cooling imparted a TRM to these portions of the pluton. The more slowly cooled granodiorite at lower levels has quartz-magnetite isotopic temperatures that are below the Curie temperature of magnetite implying that its magnetization is high-temperature CRM. Sub-Curie isotopic temperatures for other granitic plutons in the western U.S.A. suggest that CRM may be commonly derived from subsolidus interactions between magnetite and magmatic fluids in plutonic rocks. A meteoric-hydrothermal system generated by the cooling Rio Hondo pluton, and not by younger adjacent intrusions, resulted in limited alteration along zones of high permeability near the southern margin of the Rio Hondo pluton, and in more prevasive alteration of the pluton to the north. The meteoric-hydrothermal alteration occurred at relatively high temperatures (>350/sup 0/C) and, with the exception of local chloritization, caused little visible alteration of the rocks. The isotopic ratios indicate that little of the magnetite could have grown from or exchanged with a meteoric-hydrothermal fluid.

  5. Genesis of zoned granite plutons in the Iapetus Suture Zone: new constraints from high-precision micro-analysis of accessory minerals

    OpenAIRE

    Miles, Andrew James

    2013-01-01

    The Trans-Suture Suite (TSS) of granitic plutons located in Northern Britain span the Iapetus Suture and represent a particularly enigmatic stage of post-Caledonian Devonian magmatism. Despite calc-alkaline affinities, proximity to the Iapetus Suture precludes a direct relationship to active subduction. Furthermore, the absence of inherited zircons distinguishes the TSS from plutons of a similar age throughout the Scottish Highlands, and is not easily reconciled with the abunda...

  6. The Shahewan rapakivi-textured granite – quartz monzonite pluton, Qinling orogen, central China: mineral composition and petrogenetic significance

    Directory of Open Access Journals (Sweden)

    Xiaoxia Wang

    2002-01-01

    Full Text Available The Mesozoic Shahewan pluton consists of four texturally different types of biotite-hornblende quartz monzonite. In the porphyritic types alkali feldspar occurs as euhedral or ovoidal megacrysts that are often mantled by one or more plagioclase shells, and as smaller grains in the groundmass. Quartz, plagioclase (An20–28, biotite, and hornblende occur as inclusions in the alkali feldspar megacrystsand, more abundantly, in the groundmass. Euhedral quartz crystals in the groundmass are not as common and well developed as in typical rapakivi granite. Compared to typical rapakivi granites, the mafic minerals (biotite and hornblende are rich in Mg and poor in Fe, and the whole rock is low in Si, K, F, Ga, Zr, LREE, Fe/Mg, and K/Na. The rocks of the Shahewan pluton are thus regarded as rapakivi-textured quartz monzonites and granites but not true rapakivi granites.

  7. Poly-phase Deformation Recorded in the Core of the Coast Plutonic Complex, Western British Columbia

    Science.gov (United States)

    Hamblock, J. M.; Andronicos, C. L.; Hurtado, J. M.

    2006-05-01

    The Coast Plutonic Complex of western British Columbia constitutes the largest batholith within the North American Cordillera. The field area for this study is Mt. Gamsby, an unexplored region above the Kitlope River, east of the Coast Shear Zone and at the southern end of the Central Gneiss Complex. The dominant lithologies on Mt. Gamsby include amphibolite and metasedimentary gneiss, gabbro-diorite, and orthogneiss. The amphibolite gneiss contains alternating amphibolite and felsic layers, with chlorite and epidote pervasive in some regions and garnet rare. This unit is commonly migmatized and contains various folds, boudins, and shear zones. The metasedimentary gneiss contains quartz, k-spar, graphite, chlorite, and perhaps cordierite, but appears to lack muscovite and aluminosilicates. The gabbro-diorite is salt and pepper in color and contains ca. 50% pyroxene and plagioclase. The orthogneiss is light in color and plagioclase-rich, with a texture varying from coarse-grained and undeformed to mylonitic. In some regions, this unit contains abundant mafic enclaves. At least four deformational events (D1-4) are observed. The second generation of folding, F2, is dominant in the area and resulted in the production of a large synform during sinistral shearing. The S1 foliation is observed only in the amphibolite gneiss and is orthogonal to S2, creating mushroom- type fold interference patterns. S2 foliations strike NW-SE and dip steeply to the SW, suggesting SW-NE directed shortening. L2 lineations developed on S2 plunge shallowly to the NW and SE, implying strike-slip motion. Although both dextral and sinistral motions are indicated by shear band data, sinistral motion is dominant. The average right and left lateral shear band orientation is nearly identical to S2, suggesting that right and left lateral shearing were synchronous. Foliations within the orthogneiss are parallel to the axes of S2 folds and boudins in the amphibolite gneiss, suggesting that emplacement

  8. Characterizing fractured plutonic rocks of the Canadian shield for deep geological disposal of Canada's radioactive wastes

    International Nuclear Information System (INIS)

    Lodha, G.S.; Davison, C.C.; Gascoyne, M.

    1998-01-01

    Since 1978 AECL has been investigating plutonic rocks of the Canadian Shield as a potential medium for the disposal of Canada's nuclear fuel waste. During the last two years this study has been continued as part of Ontario Hydro's used fuel disposal program. Methods have been developed for characterizing the geotechnical conditions at the regional scale of the Canadian Shield as well as for characterizing conditions at the site scale and the very near-field scale needed for locating and designing disposal vault rooms and waste emplacement areas. The Whiteshell Research Area (WRA) and the Underground Research Laboratory (URL) in southeastern Manitoba have been extensively used to develop and demonstrate the different scales of characterization methods. At the regional scale, airborne magnetic and electromagnetic surveys combined with LANDSAT 5 and surface gravity survey data have been helpful in identifying boundaries of the plutonic rocks , overburden thicknesses, major lineaments that might be geological structures, lithological contacts and depths of the batholiths. Surface geological mapping of exposed rock outcrops, combined with surface VLF/EM, radar and seismic reflection surveys were useful in identifying the orientation and depth continuity of low-dipping fracture zones beneath rock outcrops to a depth of 500 to 1000 m. The surface time-domain EM method has provided encouraging results for identifying the depth of highly saline pore waters. The regional site scale investigations at the WRA included the drilling of twenty deep boreholes (> 500 m) at seven separate study areas. Geological core logging combined with borehole geophysical logging, TV/ATV logging, flowmeter logging and full waveform sonic logging in these boreholes helped to confirm the location of hydro geologically important fractures, orient cores and infer the relative permeability of some fracture zones. Single-hole radar and crosshole seismic tomography surveys were useful to establish the

  9. Understanding the evolution of S- and I-type granitic plutons through analysis of apatite.

    Science.gov (United States)

    Hess, B. L.; Fiege, A.; Tailby, N.

    2017-12-01

    The major and trace element composition of apatites from the Lachlan fold belt (LFB) S- and I-type granitoids (Australia) and the Central French Massif (CFM) S-type leucogranites (France) were analyzed to investigate their compositional and redox variation. Apatite is a common accessory mineral in magmatic systems that can incorporate a variety of trace elements, including the polyvalent elements sulfur (S), iron (Fe), and manganese (Mn). It was recently discovered that apatite can incorporate three oxidation states of S (S6+, S4+, S2-) into its structure as a function of oxygen fugacity [1]. However, the oxidation states of Mn and Fe in apatite are essentially unknown (2+ and/or 3+). In this study, we collected many electron probe line transects across apatites in several different host phases from a variety of S- and I-type plutons. The F-H-Cl contents of the S- and I-type LFB samples were similar ( 2.9 wt% F, 0.4 wt% Cl, 0.5 wt% OH). The CFM S-types contained virtually no Cl and ranged from near-endmember OH-apatite to near-endmember F-apatite. The apatites of all studied the S- and I-type plutons are characterized by similar ranges of Fe content (X-ray absorption near-edge structure (XANES) spectroscopy. The spectra show variability in S oxidation states ranging from mostly sulfate down to nearly equal S6+/S2- ratios, indicating redox variations during apatite formation. The S-type Mn + Fe content plots in a 1:1 ratio against calcium (Ca) in atoms per formula unit, while the I-type apatites have too low Mn and Fe to show a clear trend. Thus, divalent Mn and Fe probably replace Ca2+ in the S-types' apatite structure, while the incorporation of trivalent Mn or Fe in apatite is rather unlikely. We suggest that Mn and Fe contents in apatite may become a useful tracer of melt evolution once the distributions coefficients are experimentally calibrated. [1] Konecke et al. (2017), Am Mineral

  10. The Precambrian/Lower Cambrian pluton from Vila Nova (Central Portugal

    Directory of Open Access Journals (Sweden)

    Reis, A. I.M.

    2010-06-01

    Full Text Available The Vila Nova pluton is a small, Pre-Variscan granitic body that intruded rocks of the Central Iberian Zone near the contact with the Ossa Morena Zone and is affected by several shear zones and faults. Its contact metamorphic aureole is constituted by micaschist with porphyroblasts in the outer zone and hornfels in the inner zone. Small metasedimentar xenoliths are dispersed all over the body. The pluton has a great mineralogical heterogeneity with pronounced variations in muscovite/biotite and plagioclase/microcline contents and is classified as granite, granodiorite or tonalite. It is a leucogranite, highly peraluminous (A/CNK = 1.31 – 1.64, magnesian and calc-alkaline to alkaline-calcic. The variation diagrams show curvilinear trends with silica. Eu/Eu* = 0.47 – 0.77 and there is a slight enrichment in LREE relative to HREE. The normalized diagrams indicated dominantly crustal granite, related to subduction. U-Pb isotopic data of zircon and monazite gives 540-542 Ma age.

    El plutón de Vila Nova es un pequeño cuerpo granítico pre-varisco, que intruyó en las rocas de la Zona Centro Ibérica, cerca del contacto con la Zona de Ossa Morena, siendo afectado por varias fallas y zonas de cizalla. Su aureola de metamorfismo de contacto consiste en esquistos con porfiroblastos y corneanas. Pequeños xenolitos metasedimentarios aparecen dispersos por todo el cuerpo granítico. Presenta una gran diversidad mineralógica, con amplias variaciones en las relaciones biotita/moscovita y microclina/plagioclasa, siendo clasificado como tonalita-granodiorita-granito. Se trata de un leucogranito fuertemente peralumínico (A/CNK = 1.31 – 1.64, magnesiano y calco-alcalino a alcalino-cálcico. Los diagramas muestran variaciones curvilíneas con la variación de sílice. Eu/Eu* = 0.47 – 0.77 y hay un ligero enriquecimiento de LREE en relación con HREE. Los diagramas indican que la norma es un granito dominante de la corteza, relacionados con la

  11. Norite and charnockites from the Venda Nova Pluton, SE Brazil: Intensive parameters and some petrogenetic constraints

    Directory of Open Access Journals (Sweden)

    Julio Cezar Mendes

    2012-11-01

    Full Text Available The Venda Nova Pluton (VNP is a zoned ring structure emplaced in the southern portion of the Neoproterozoic Araçuai Belt, in Espírito Santo, Brazil. It is a slightly westward tilted cylinder-like intrusion, with an almost circular horizontal section. In the center of this structure, an off-centered gabbro-noritic core, surrounded by syeno-monzonitic rocks, intrudes an outer ring of charnockites and norite. These envelop the syeno-monzonitic and gabbro-noritic center, as a narrow discontinuous belt. While, in the core intrusion, mingling and mixing processes are widespread and well documented in the literature, in the outer ring, the norite and charnockite layers show predominantly homogeneous and isotropic internal structures. Nevertheless, smaller interaction zones between charnockites and norite denote a comparatively more restricted mingling process. The norite is a fine-grained rock with hypidiomorphic granular to intergranular texture. The charnockites are medium-grained and made up of: (a orthopyroxene-tonalite, (b orthopyroxene-quartz-diorite, and (c orthopyroxene-granodiorite with hypidiomorphic granular to porphyritic textures. In all lithotypes both ortho- and clinopyroxene are replaced by hornblende and biotite. Two contrasting compositional sequences have been recognized, based on whole rock geochemistry: (1 a basic, with tholeiitic affinities (norite and, (2 an intermediate, medium-K calc-alkaline, comprising the charnockites. Estimated crystallization temperatures, which have been calculated from micro-probe analysis of pyroxenes, range from 915 ± 25 °C to 960 ± 50 °C. Re-equilibration temperature (ilmenite-magnetite calibration is around 600 ± 50 °C. This indicates oxygen fugacities four order of magnitude below the FMQ-buffer and a reduced environment. Coeval pressure conditions estimated from the Al-content in hornblende range from 5.5 ± 0.6 kbar. Data obtained for the norite point toward an evolution from

  12. Temporal Evolution of Volcanic and Plutonic Magmas Related to Porphyry Copper Ores Based on Zircon Geochemistry

    Science.gov (United States)

    Dilles, J. H.; Lee, R. G.; Wooden, J. L.; Koleszar, A. M.

    2015-12-01

    Porphyry Cu (Mo-Au) and epithermal Au-Ag ores are globally associated with shallow hydrous, strongly oxidized, and sulfur-rich arc intrusions. In many localities, long-lived magmatism includes evolution from early andesitic volcanic (v) and plutonic (p) rocks to later dacitic or rhyolitic compositions dominated by plutons. We compare zircon compositions from three igneous suites with different time spans: Yerington, USA (1 m.y., p>v), El Salvador, Chile (4 m.y., p>v), and Yanacocha, Peru (6 m.y., v>p). At Yerington granite dikes and ores formed in one event, at ES in 2 to 3 events spanning 3 m.y., and at Yanacocha in 6 events spanning 5 m.y. At both ES and Yanacocha, high-Al amphiboles likely crystallized at high temperature in the mid-crust and attest to deep magmas that periodically recharged the shallow chambers. At Yanacocha, these amphiboles contain anhydrite inclusions that require magmas were sulfur-rich and strongly oxidized (~NNO+2). The Ti-in-zircon geothermometer provides estimates of 920º to 620º C for zircon crystallization, and records both core to rim cooling and locally high temperature rim overgrowths. Ore-related silicic porphyries yield near-solidus crystallization temperatures of 750-650°C consistent with low zircon saturation temperatures. The latter zircons have large positive Ce/Ce* and small negative Eu/Eu*≥0.4 anomalies attesting to strongly oxidized conditions (Ballard et al., 2001), which we propose result from crystallization and SO2 loss to the magmatic-hydrothermal ore fluid (Dilles et al., 2015). The Hf, REE, Y, U, and Th contents of zircons are diverse in the magma suites, and Th/U vs Yb/Gd plots suggest a dominant role of crystal fractionation with lesser roles for both crustal contamination and mixing with high temperature deep-sourced mafic magma. Ce/Sm vs Yb/Gd plots suggest that magma REE contents at contamination are most evident in pre-ore magmas, whereas ore-forming intrusions at low temperatures are dominated by crystal

  13. Formation of Intermediate Plutonic Rocks by Magma Mixing: the Shoshonite Suite of Timna, Southern Israel.

    Science.gov (United States)

    Fox, S.; Katzir, Y.

    2017-12-01

    In magmatic series considered to form by crystal fractionation intermediate rocks are usually much less abundant than expected. Yet, intermediate plutonic rocks, predominantly monzodiorites, are very abundant in the Neoproterozoic Timna igneous complex, S. Israel. A previously unnoticed plutonic shoshonitic suite was recently defined and mapped in Timna (Litvinovsky et al., 2015). It mostly comprises intermediate rocks in a seemingly 'continuous' trend from monzodiorite through monzonite to quartz syenite. Macroscale textures including gradational boundaries of mafic and felsic rocks and MME suggest that magma mixing is central in forming intermediate rocks in Timna. Our petrographic, microtextural and mineral chemistry study delineates the mode of incipient mixing, ultimate mingling and crystal equilibration in hybrid melts. An EMP study of plagioclase from rocks across the suite provides a quantitative evaluation of textures indicative of magma mixing/mingling, including recurrent/patchy zoning, Ca spike, boxy/sponge cellular texture and anti-Rapakivi texture. Each texture has an affinity to a particular mixing region. A modal count of these textures leads to a kinetic mixing model involving multi temporal and spatial scales necessary to form the hybrid intermediate rocks. A `shell'-like model for varying degrees of mixing is developed with the more intensive mixing at the core and more abundant felsic and mafic end-members towards the outer layer. REE patterns in zircon shows that it originated from both mafic and felsic parent melts. Whole rock Fe vs Sr plot suggests a two-stage mixing between the monzogabbro and quartz-syenite producing first mesocratic syenite, and subsequent mixing with a fractionating monzogabbro resulting in monzonitic compositions. A fractionating monzogabbro intruded into a syenitic melt sequentially. While slowly cooling, the monzogabbro heated the immediate syenitic melt, lowering the viscosity and rheological obstruction to overturn

  14. Ion-adsorption REEs in regolith of the Liberty Hill pluton, South Carolina, USA: An effect of hydrothermal alteration

    Science.gov (United States)

    Bern, Carleton R.; Yesavage, Tiffany; Foley, Nora K.

    2017-01-01

    Ion-adsorbed rare earth element (REE) deposits supply the majority of world heavy REE production and substantial light REE production, but relatively little is known of their occurrence outside Southeast Asia. We examined the distribution and forms of REEs on a North American pluton located in the highly weathered and slowly eroding South Carolina Piedmont. The Hercynian Liberty Hill pluton experiences a modern climate that includes ~ 1500 mm annual rainfall and a mean annual temperature of 17 °C. The pluton is medium- to coarse-grained biotite-amphibole granite with minor biotite granite facies. REE-bearing phases are diverse and include monazite, zircon, titanite, allanite, apatite and bastnäsite. Weathered profiles were sampled up to 7 m-deep across the ~ 400 km2 pluton. In one profile, ion-adsorbed REEs plus yttrium (REE + Y) ranged up to 581 mg/kg and accounted for up to 77% of total REE + Y in saprolite. In other profiles, ion-adsorbed REE + Y ranged 12–194 mg/kg and only accounted for 3–37% of totals. The profile most enriched in ion-adsorbed REEs was located along the mapped boundary of two granite facies and contained trioctahedral smectite in the saprolite, evidence suggestive of hydrothermal alteration of biotite at that location. Post-emplacement deuteric alteration can generate easily weathered REE phases, particularly fluorocarbonates. In the case of Liberty Hill, hydrothermal alteration may have converted less soluble to more soluble REE minerals. Additionally, regolith P content was inversely correlated with the fraction ion-adsorbed REEs, and weathering related secondary REE-phosphates were found in some regolith profiles. Both patterns illustrate how low P content aids in the accumulation of ion-adsorbed REEs. The localized occurrence at Liberty Hill sheds light on conditions and processes that generate ion-adsorbed REEs.

  15. Structure, emplacement, and tectonic setting of Late Devonian granitoid plutons in the Teplá–Barrandian unit, Bohemian Massif

    Czech Academy of Sciences Publication Activity Database

    Žák, J.; Kratinová, Zuzana; Trubač, J.; Janoušek, V.; Sláma, Jiří; Mrlina, Jan

    2011-01-01

    Roč. 100, č. 7 (2011), s. 1477-1495 ISSN 1437-3254 R&D Projects: GA AV ČR KJB300120702 Institutional research plan: CEZ:AV0Z30120515; CEZ:AV0Z30130516 Keywords : Bohemian Massif * Teplá-Barrandian unit * Variscan orogeny * granite * pluton * subduction Subject RIV: DB - Geology ; Mineralogy Impact factor: 2.342, year: 2011

  16. Plutonic rocks in the Mineoka-Setogawa ophiolitic mélange, central Japan: Fragments of middle to lower crust of the Izu-Bonin-Mariana Arc?

    Science.gov (United States)

    Ichiyama, Yuji; Ito, Hisatoshi; Hokanishi, Natsumi; Tamura, Akihiro; Arai, Shoji

    2017-06-01

    A Paleogene accretionary complex, the Mineoka-Setogawa Belt, is distributed around the Izu Collision Zone, central Japan. Plutonic rocks of gabbro, diorite and tonalite compositions are included as fragments and dykes in an ophiolitic mélange in this belt. Zircon U-Pb dating of the plutonic rocks indicates that they were formed at ca. 35 Ma simultaneously. These ages are consistent with Eocene-Oligocene tholeiite and calc-alkaline arc magmatism in the Izu-Bonin-Mariana (IBM) Arc and exclude several previous models for the origin of the Mineoka-Setogawa ophiolitic rocks. The geochemical characteristics of these plutonic rocks are similar to those of the Eocene-Oligocene IBM tholeiite and calc-alkaline volcanic rocks as well as to the accreted middle crust of the IBM Arc, the Tanzawa Plutonic Complex. Moreover, their lithology is consistent with those of the middle and lower crust of the IBM Arc estimated from the seismic velocity structure. These lines of evidence strongly indicate that the plutonic rocks in the Mineoka-Setogawa ophiolitic mélange are fragments of the middle to lower crust of the IBM Arc. Additionally, the presence of the Mineoka-Setogawa intermediate to felsic plutonic rocks supports the hypothesis that intermediate magma can form continental crust in intra-oceanic arcs.

  17. Propuestas de mejora al mercado de energía mayorista para asegurar la confiabilidad del Sistema Interconectado Nacional

    OpenAIRE

    Castillo Marín, Jaime Alonso

    2016-01-01

    Las fallas de mercado justifican la regulación en los mismos y dadas las características del sector eléctrico se han realizado diseños de mercados en búsqueda de una asignación eficiente de los recursos -- Este diseño para el Mercado de Energía Mayorista en Colombia se ha mantenido en esencia igual desde sus inicios, a excepción de la creación del mercado de confiabilidad desarrollado posteriormente -- Ante periodos de escasez en la oferta, en el Mercado de Energía Mayorista se ha visto la ne...

  18. The ultimate fate of a synmagmatic shear zone. Interplay between rupturing and ductile flow in a cooling granite pluton

    Science.gov (United States)

    Zibra, I.; White, J. C.; Menegon, L.; Dering, G.; Gessner, K.

    2018-05-01

    The Neoarchean Cundimurra Pluton (Yilgarn Craton, Western Australia) was emplaced incrementally along the transpressional Cundimurra Shear Zone. During syndeformational cooling, discrete networks of cataclasites and ultramylonites developed in the narrowest segment of the shear zone, showing the same kinematics as the earlier synmagmatic structures. Lithological boundaries between aplite/pegmatite veins and host granitic gneiss show more intense pre-cataclasite fabrics than homogeneous material, and these boundaries later became the preferred sites of shear rupture and cataclasite nucleation. Transient ductile instabilities established along lithological boundaries culminated in shear rupture at relatively high temperature (∼500-600 °C). Here, tensile fractures at high angles from the fault plane formed asymmetrically on one side of the fault, indicating development during seismic rupture, establishing the oldest documented earthquake on Earth. Tourmaline veins were emplaced during brittle shearing, but fluid pressure probably played a minor role in brittle failure, as cataclasites are in places tourmaline-free. Subsequent ductile deformation localized in the rheologically weak tourmaline-rich aggregates, forming ultramylonites that deformed by grain-size sensitive creep. The shape and width of the pluton/shear zone and the regime of strain partitioning, induced by melt-present deformation and established during pluton emplacement, played a key role in controlling the local distribution of brittle and then ductile subsolidus structures.

  19. [Discussion on diagenesis of Xilingang pluton-constrained by X-ray Fluorescence spectroscopy, plasma mass spectrometry and Raman spectroscopy].

    Science.gov (United States)

    Tang, Yu-Kun; Chen, Guo-Neng; Zhang, Ke; Huang, Hai-Hua

    2013-05-01

    The results on Xilingang pluton, mainly consisting of red beds, granites containing numerous debris of red beds and granites, obtained by X-ray fluorescence spectroscopy, plasma mass spectrometry and Raman spectroscopy show: (1) Xilingang pluton from red beds, granites containing numerous debris of red beds to granites has obvious characteristics of decreasing silicon and alkali content, and rising ignition loss, dark mineral content and oxidation index; (2) Chondrite-normalized REE distribution curves and primitive mantle-normalized spider diagram for trace elements of redbed, granites containing numerous debris of red beds and granites have a good consistency, the distribution characteristics of elements are similar to Nanling transformation-type granite; (3) The value of Raman spectrogram characteristic peak of quartz crystal in Xilingang granite decreased from the center of quartz crystal, and FWHM is steady. According to the above, the authors believe that Xilingang granite formed was related to in-situ melting of red beds and underlying strata and magma consolidation. Volatile components were discharged continuously, and oxidation index decreased gradually in the melting process. In the process of diagenesis, the top of pluton tend to be an ongoing silicon and alkali increase, while TFeO and MgO continue to migrate to bottom, and crystallization environment is a relatively closed and steady system.

  20. A tale of 10 plutons - Revisited: Age of granitic rocks in the White Mountains, California and Nevada

    Science.gov (United States)

    McKee, E.H.; Conrad, J.E.

    1996-01-01

    40Ar/39Ar incremental heating analysis and conventional K-Ar age determinations on plutonic rocks of the White Mountains define two stages of magmatic emplacement: Late Cretaceous, between ca. 90 Ma and 75 Ma, and Middle-Late Jurassic, between ca. 180 and 140 Ma. The Jurassic stage can be divided into two substages, 180-165 Ma and 150-140 Ma. Thermal effects of the younger plutons on the older granitoids partially to completely reset ages, making it difficult to determine the age of emplacement and cooling of several of the plutons even by 40Ar/39Ar incremental heating analyses. New data together with published ages and regional geochronological synthesis of the Sierra Nevada batholith indicate that regions within the batholith have coherent periods or episodes of magmatic activity. In the White Mountains and Sierra Nevada directly to the west there was little or no activity in Early Jurassic and Early Cretaceous time; magmatism took place during relatively short intervals of 15 m.y. or less in the Middle and Late Jurassic and Late Cretaceous periods. The new K-Ar and 40Ar/39Ar analyses of granitoids from the White Mountains help, but do not completely clarify the complex history of emplacement, cooling, and reheating of the batholith.

  1. The Transhimalaya (Gangdese) plutonism in the Ladakh region: A U-Pb and Rb-Sr study

    International Nuclear Information System (INIS)

    Schaerer, U.; Hamet, J.; Allegre, C.J.

    1984-01-01

    The age and origin of the Transhimalaya (Gangdese) plutonic belt in the Ladakh area has been studied by high-resolution U-Pb analyses of accessory minerals (zircon and monazite/allanite) and Rb-Sr measurements on whole rock samples. The ages determined of 101+-2 m.y. for a granodiorite and of 60.7+-0.4 m.y. for a granite substantiate that the Transhimalaya plutonism was active at least in mid-Cretaceous (Albian) and earliest Tertiary (Palaeocene) times. A Rb-Sr isochron of 73.4+-2.4 m.y. might be fortuitous because the Rb-Sr systematics shows important heterogeneities on the whole rock scale. The inherited radiogenic lead in zircon demonstrates that anatexis of continental crust was involved in magma genesis. The thus recycled continental material was heterogeneous with respect to its primary ages and/or metamorphic history; the approximate minimum ages of the continental sources range from 350 to 590 m.y. The 101+-2 m.y. old Transhimalaya granodiorite, which intrudes a series of mainly basaltic island arc rocks (Dras Series) shows that this island arc was attached to the continental margin at that times. This is consistent with the hypothesis that the ''Ladakh Tethys'' closed through two subduction regimes: (1) an early Cretaceous subduction, which formed the Dras island arc, and (2) a late Cretaceous to Palaeocene subduction at the continental margin, which caused the emplacement of the Transhimalaya plutonic belt. (orig.)

  2. Contrasting magmatic structures between small plutons and batholiths emplaced at shallow crustal level (Sierras de Córdoba, Argentina)

    Science.gov (United States)

    Pinotti, Lucio P.; D'Eramo, Fernando J.; Weinberg, Roberto F.; Demartis, Manuel; Tubía, José María; Coniglio, Jorge E.; Radice, Stefania; Maffini, M. Natalia; Aragón, Eugenio

    2016-11-01

    Processes like injection, magma flow and differentiation and influence of the regional strain field are here described and contrasted to shed light on their role in the formation of small plutons and large batholiths their magmatic structures. The final geometric and compositional arrangement of magma bodies are a complex record of their construction and internal flow history. Magma injection, flow and differentiation, as well as regional stresses, all control the internal nature of magma bodies. Large magma bodies emplaced at shallow crustal levels result from the intrusion of multiple magma batches that interact in a variety of ways, depending on internal and external dynamics, and where the early magmatic, growth-related structures are commonly overprinted by subsequent history. In contrast, small plutons emplaced in the brittle-ductile transition more likely preserve growth-related structures, having a relatively simple cooling history and limited internal magma flow. Outcrop-scale magmatic structures in both cases record a rich set of complementary information that can help elucidate their evolution. Large and small granitic bodies of the Sierra Pampeanas preserve excellent exposures of magmatic structures that formed as magmas stepped through different rheological states during pluton growth and solidification. These structures reveal not only the flow pattern inside magma chambers, but also the rheological evolution of magmas in response to temperature evolution.

  3. Prêmio de liquidez de ações : um estudo para o mercado brasileiro

    OpenAIRE

    Chiara, Marco

    2014-01-01

    Existe uma divergência nos estudos de mercados emergentes sobre a relação entre retorno e liquidez. Enquanto nos mercados desenvolvidos é consenso que o retorno cresce com a falta de liquidez, em mercados como o Brasil concorda-se com a sua influência, mas não é unânime o crescimento da rentabilidade diante da iliquidez. Assim, este estudo busca definir as variáveis que representam o conceito de liquidez e se elas possuem influência no retorno das ações brasileiras, além de entender se existe...

  4. Análisis de la competitividad del mercado primario de leche en Argentina.

    OpenAIRE

    Andrés Loza

    2001-01-01

    El mercado mayorista de leche en Argentina muestra una estructura apropiada para que las empresas tengan poder de mercado y se apropien de parte de la renta que correspondería a los productores rurales en un entorno competitivo. La presente investigación utiliza las modernas técnicas de la Nueva Organización Industrial Empírica, para resolver si las empresas mayoristas elaboradoras de leche ejercen su poder de mercado sobre el productor o tambero. Tanto las pruebas paramétricas y no paramétri...

  5. Un Análisis de las Variaciones de Precios Diarias en el Mercado de Liniers

    OpenAIRE

    Rossini, Gustavo

    2007-01-01

    A pesar de la importancia como mercado de referencia para la ganadería vacuna argentina, pocos estudios han examinado el comportamiento de las variaciones de los precios diarios en las categorías comercializadas en el Mercado de Liniers. Dado esto, el objetivo de este trabajo es aportar información sobre la incidencia de variables seleccionadas sobre los cambios en los precios diarios en este mercado en las categorías de mayor ingreso diario. Para ello, un Modelo Logístico Multinomial es usad...

  6. Estrutura de capital e janelas de oportunidade: testes no mercado brasileiro

    Directory of Open Access Journals (Sweden)

    Eduardo Alexandre Mendes

    2009-12-01

    Full Text Available Este estudo testa a teoria das janelas de oportunidade (EMTT para o mercado acionário brasileiro. Este texto é uma adaptação do artigo de Baker e Wurgler (2002 que testaram com sucesso essa teoria para o mercado acionário americano. A teoria não foi comprovada no mercado brasileiro. A alavancagem diminuiu no primeiro ano após as ofertas públicas iniciais (IPO, mas cresceu novamente sem apresentar a persistência necessária para corroborar a teoria.

  7. ALCANCES, LIMITACIONES E IMPACTO DE LA REFORMA A LA LEY REGULADORA DEL MERCADO DE VALORES

    Directory of Open Access Journals (Sweden)

    Julio César Espinosa Rodríguez

    2011-09-01

    Full Text Available La nueva ley de valores establece una serie de parámetros requeridos para el desarrollo del mercado de valores, enmarcado dentro de una mejor regulación y mayor seguridad para los inversionistas. En general establece las bases para pasar a una nueva etapa de desarrollo del sistema financiero, donde el énfasis será el mercado de largo plazo. Asimismo, la propuesta de la Bolsa Nacional de Valores para desarrollar el mercado accionario se ha transformado en un mecanismo complementario a ese cometido, donde la actuación de la Superintendencia General de Valores ha buscado catalizar ese proceso.

  8. Evidencia empírica de poder de mercado en industrias minoristas de gas natural vehicular.

    OpenAIRE

    García, John J.; Montenegro, Carlos Mauricio; Velásquez, Ermilson

    2012-01-01

    La alta concentración del mercado minorista de Gas Natural Vehicular -GNV en Colombia permite el ejercicio de poder de mercado. El mecanismo de fijación de precio de venta en las Estaciones de Servicio –EDS’s se asemeja al de un modelo teórico oligopólico de Franja Cuasi-Competitiva, en el cual se identifica una empresa líder en el mercado y otras seguidoras, tomadoras de precio. Mediante el índice Herfindahl-Hirschman (HHI) se encontró alto nivel de concentración en la industria y por medio ...

  9. Padronização das taxas de juros nos investimentos realizados no mercado financeiro

    OpenAIRE

    Galhano Junior, Geraldo Prado

    1983-01-01

    Visando eliminar a confusão entre os investidores e padronizar um procedimento das instituições financeiras, propõe-se que todos os investimentos do mercado financeira sejam feitos através de um único modelo de juros. Dentre os modelos de juros existentes no mercado, foi adotado o modelo de juros compostos, para ser efetuada a padronização. A escolha do modelo de juros composto se deve as suas características, que melhor representam a realidade do nosso mercado financeiro, como teremos oportu...

  10. La administración del riesgo en el Mercado Forex

    OpenAIRE

    López Suárez, Santiago

    2014-01-01

    Los inversionistas, desde el ángulo especulativo y con enfoque en el análisis técnico abordan los mercados financieros con estrategias que involucran mucho su percepción propia -- Los avances tecnológicos no solo facilitan el tener una cercanía constante a los mercados financieros a través de plataformas o software descargables, sino facilidad de acceso a diversas estrategias técnicas vigentes aplicadas a estos mercados, pero lo que diferencia el éxito del fracaso al especular con activos fin...

  11. A transformation for predicting mechanical changes resulting from time-dependent microcracking in plutonic rock

    International Nuclear Information System (INIS)

    Heinrich, W.F.

    1987-01-01

    A transformation for a simple phenomenological model of microcracking is proposed. It relates the evolution of microcrack size in an elastic solid (plutonic rock) under different temporal macro- and microstresses. In this model, for a rock property that changes as a result of microcracking, both the calculated and the experimentally determined evolution of that property for a given stress history can be used to determine the evolution of that property (for the same range) for any other stress history. For example, the transformation can be used to extrapolate the short-term extent of microcracking due to thermally induced stresses to time scales too long for experimental determination. This is of interest in assessing the long-term behaviour of rock surrounding a high level nuclear waste vault, where thermally induced microcracking may take tens of thousands of years to develop. Experimental strategies are suggested for validation of the phenomenological model. Where results are obtained from the corresponding mathematical models, the transformation facilitates the efficient calculation of functions that depend only on the state of microcrack size once the functions have been calculated for any convenient stress history

  12. Spinel and orthopyroxene exsolved from clinopyroxene in the Haladala pluton in the middle Tianshan (Xinjiang, China)

    Science.gov (United States)

    Zhu, Yongfeng; Chen, Jing; Xue, Yunxin; Feng, Wanyi; Jiang, Jiuyang

    2017-12-01

    The Haladala pluton, consisting of troctolite, olivine gabbro and gabbro with zircon SHRIMP U-Pb age of 309 ± 2 Ma (MSWD = 0.72), intruded the Devonian-Carboniferous arc segments in the middle Tianshan. Amphibole, coexisting with magnetite, amphibole, and phlogopite, crystallized in a magma chamber at depth of 20 km (6.9-7.4 kbar, 934-943 °C) based on various thermobaramoters. Two kinds of exsolution textures (spinel rods in clinopyroxene, orthopyroxene lamellae in clinopyroxene) occur in troctolite and olivine gabbro. We describe oriented spinel rods and orthopyroxene lamellae exsolved from the host clinopyroxene based on optical and high-resolution transmission electron microscope (HRTEM) observations. The spinel rods (100) are parallel to their host clinopyroxene (010). Orthopyroxene lamellae (010) are coherent and strictly parallel to their host clinopyroxene (010). Exsolution of spinel rods from the host clinopyroxene is controlled by the reaction of (Ca0.5M2+ 0.5)Fe3+[AlSiO6]in clinopyroxene → (Ca0.86-0.17M2+ 0.14-0.17)(M2 + 1.00-0.96Al0-0.04)[Al0.17-0.10Si1.83-1.90O6] + Fe3O4 + O2.

  13. Natural radionuclides in the rocks of the Valle del Cervo Pluton in Piedmont.

    Science.gov (United States)

    Sesana, Lucia; Fumagalli, Marco; Carnevale, Mauro; Polla, Giancarla; Facchini, Ugo; Colombo, Annita; Tunesi, Annalisa; De Capitani, Luisa; Rusconi, Rosella

    2006-01-01

    Monitoring of the gamma radiation in Valle del Cervo Pluton was performed by determining U and Th contents in the main rock types cropping out over the entire area and pertaining to the granitic complex, syenitic complex and monzonitic complex. In particular, syenitic rocks were largely used as building and ornamental materials (e.g. Sienite della Balma). All the samples are fresh and do not present joints or fractures filled with U minerals. In the crushed samples the activity of uranium varies from 346 to 764 Bq/kg. Concentration of thorium varies from 202 to 478 Bq/kg. For all the analysed rocks uranium activity is higher than thorium one. The lowest value of radioactive concentration is referred to rocks of the granitic complex. The most active rocks are syenites. The data confirm the high activities of Valle del Cervo rock types, strongly connected with high K content of the source magma (geochemical signature); on the contrary, the activity seems to be not related to the location of the samples.

  14. A review of the compositional variation of amphiboles in alkaline plutonic complexes

    Science.gov (United States)

    Mitchell, Roger H.

    1990-12-01

    Compositional data for amphiboles occurring in alkaline plutonic complexes are reviewed and a standard procedure for plotting these data in an isometric prism is proposed. The main compositional trend found in both oversaturated and undersaturated complexes of either miascitic or peralkaline affinity is referred to as the primary magmatic trend. Amphiboles range in composition from magnesian hastingsitic hornblende and ferro-edenitic hornblende through katophorite to ferro-richterite and arfvedsonite. Individual complexes differ with respect to the amphibole {Mg}/{Fe} and {Si}/{Al} ratio and the extent of Na-enrichment. Extensive or limited ranges in the composition of amphiboles may occur in a given complex. A subtrend found only in oversaturated complexes is from ferro-edenitic hornblende to ferro-actinolite. This trend termed the ferro-actinolitic subtrend is found only in low temperature non-peralkaline residua. Some aluminous nepheline syenites and associated alkali gabbros contain amphiboles which range in composition from kaersutite through ferroan pargasitic hornblende to hastingsite. This trend termed the primary miascitic magmatic trend is is one of decreasing {Mg}/{Fe}, at essentially constant {Si}/{Al} and Ca content. Na-enrichment does not occur. Amphiboles formed by reactions of preexisting phases with hydrothermal or deuteric fluids are termed the late stage reaction assemblage. Amphibole compositional trends from calcic through sodic-calcic to sodic amphiboles reflect decreasing temperature and oxygen fugacity at or below the QFM oxygen buffer. The compositional trends are of use in determining petrogenetic relationships between apparently consanguineous syenites.

  15. U-Pb geochronology on zircon from the Aouli pluton, Haute Moulouya area, Morocco

    International Nuclear Information System (INIS)

    Oukemeni, D.; Krogh, T.E.

    1995-01-01

    The Aouli Pluton consists of four units: (1) granodiorite; (2) grey granite; (3) pink granite - these three units constituting a spatially continuous massif, and (4) muscovite granite, which is exposed in two small stocks somewhat removed from the other units. U-Pb ages obtained on zircon and titanite are 333 ± 2 Ma and 319 ± 1.5 Ma for the granodiorite and grey granite respectively. The 14 ma age difference between the granodiorite and the grey granite supports the multiple injection hypothesis which was the outcome of geochemical studies (Oukemeni and Bourne, 1993). These two rocks also contain an inherited component which has been dated at 1520 Ma in the granudiorite and at 1245 ma and 1804 Ma in the grey granite. The inherited components suggest the possible presence of Precambian crust below the Haute Moulouya. Since the intrusion is late-to post-tectonic (Oukemeni and Bourne, 1993), the age of the granodiorite (333 ± 2 Ma) indicates that the Hercynian deformation is pre-Visean in the Haute Moulouya area, and, by extension, throughout the eastern meseta region. (authors). 14 refs. 4 figs. 3 tabs

  16. Anomally '60': a uraniferous granitic pluton on Melville Peninsula, N.W.T

    International Nuclear Information System (INIS)

    Delpierre, M.E.

    1982-01-01

    The Proterozoic (Aphebian) Penrhyn Group in the Foxe Fold Belt in south-central Melville Peninsula, N.W.T. hosts numerous coarse-grained to pegmatitic granitic plutons, some of which show a definite enrichment in uranium with a few being significantly anomalous. Anomaly '60' is caused by a strongly radioactive pegmatitic granite intrusion that occurs at the base of the Penrhyn metasediments which rest unconformably on Archean gneisses. The granite is both discordant and concordant with the Proterozoic country rocks (marbles and paragneisses) and exhibits ghost layering at numerous localities. Uranium mineralization as uranophane and other secondary minerals sometimes forming pseudomorphs after uraninite appears to show a strong association with biotite accumulations. Thorium is variably present and may exceed the uranium content. Results from rock geochemistry, ground radiometry, detailed prospecting and a diamond drill program of six short holes conducted in 1979, indicate that although some ore grade mineralization occurs over short sections, the low grade and tonnage potential coupled with logistical difficulties, makes this 'porphyry uranium' occurrence uneconomic at present

  17. The intrusive complexof the Island of Giglio: geomagnetic characteristics of plutonic facies with low susceptibility contrast

    Directory of Open Access Journals (Sweden)

    R. Cavallini

    1998-06-01

    Full Text Available Two main plutonic facies characterize the intrusive complex of the Island of Giglio, and the trend of their contact at depth has been modelled using a 2D½ analysis based on a detailed geomagnetic survey in order to verify the geological hypothesis of the subsurface geometry of this contact. The magnetic anomaly connected with the discontinuity is quite low, due to the small difference between the magnetic susceptibilities of the two granitic facies. Development of this model of inversion of the magnetic field, which is in good agreement with the geological interpretation, was made possible by: 1 accurate control of the geomagnetic time variations and consequent temporal reduction, 2 a very low level of the artificial magnetic noise, 3 high density of the magnetic survey, 4 detailed knowledge of the mapped geologic contact between facies and of their petrologic characteristics, and 5 direct local measurements of the magnetic susceptibilities of the key lithologies. The model shows the trends of the geological contact, as projected in three E-W sections, that dips eastward in the range between 210 and 540, supporting the geologic hypothesis that the Pietrabona facies represents an external shell of the shallowly emplaced Giglio monzogranite intrusion.

  18. PRODUCCIÓN DE HOJARASCA EN UN RODAL DE Pinus cembroides Zucc. EN ARTEAGA, COAHUILA, MÉXICO Y SU RELACIÓN CON LAS VARIABLES CLIMÁTICAS

    Directory of Open Access Journals (Sweden)

    Santiago A. Reyes-Carrera

    2013-01-01

    Full Text Available La caída de hojarasca constituye la fuente principal de materia orgánica en los ecosistemas terrestres. La evaluación de la caída de hojarasca es importante para entender la productividad forestal, pero también proporciona información relevante como indicador fenológico de los efectos del cambio climático. Este estudio se llevó a cabo en un rodal joven de Pinus cembroides Zucc. en la sierra de Arteaga, Coahuila, México. La hojarasca fue colectada mensualmente usando 40 colectores (1 m2 ubicados sistemáticamente dentro de una parcela de 1 ha. La prueba no paramétrica de Kruskal-Wallis se utilizó para detectar diferencias significativas entre fechas de colecta. Las relaciones de producción de hojarasca con las variables climáticas se evaluaron mediante análisis de componentes principales y modelos de regresión. La deposición total de hojarasca fue poco más de 1,000 kg·ha-1·año-1, la cual fue dependiente de la temperatura y el viento. Las acículas y ramas constituyeron cerca del 33 y 22 % de la deposición total, respectivamente.

  19. Mercado de datos: conceptos y metodologías de desarrollo

    Directory of Open Access Journals (Sweden)

    Ricardo Chinchilla Arley

    2011-10-01

    Full Text Available En este artículo se ofrece una descripción sobre la importancia del depósito y del mercado de datos. Además, identifican y formulan las principales definiciones, esquemas y términos básicos relacionados con el mercado de datos. Igualmente, se establecen y desarrollan los modelos de implementación y las metodologías para el desarrollo de un mercado de datos. Por último, se consideran las formas tecnológicas de procesamiento analítico en línea (OLAP y su utilidad en el análisis del mercado de datos.

  20. Mercado/Robb/Buchdahl coefficients: an update of 243 common glasses

    Science.gov (United States)

    Bolser, Michael

    2002-12-01

    The 1983 Mercado/Robb listing of Buchdahl chromatic coordinate coefficients is supplemented with glasses from the Schott and O'Hara catalogues. The coefficients were calculated by using Buchdahl's cubic model. Appropriately selected materials yield a superachromat.

  1. Gestión de mercado basada en la eficiencia de los procesos de aprendizaje

    Directory of Open Access Journals (Sweden)

    Ma. Cruz Lozano Ramírez

    2016-06-01

    Full Text Available Este documento presenta los resultados de un estudio cuyo objetivo fue identificar la gestión de mercado basada en la eficiencia de la implementación de procesos de aprendizaje en el contexto de estrategias de mercado. El diseño de investigación fue no experimental, correlacional, aplicado a 21 sujetos con funciones dirección en organizaciones de los sectores comercio y servicios. Los resultados de las pruebas explican que la eficiencia de la gestión de mercado está determinada por los procesos de aprendizaje relativos al diseño de estrategias que abordan la ampliación del mercado con servicios especializados e incremento en clientes, beneficios e innovación de productos, programas de promoción y diferenciación de precios.

  2. Comportamiento del Comercio Mundial de Palta y Perspectivas del Mercado Chino

    OpenAIRE

    Ministerio de Agricultura y Riego

    2015-01-01

    En el presente Reporte de la Situación de la Palta en el Mercado Internacional veremos los precios internacionales, la producción Mundial, La exportación Mundial, Exportaciones de México, Competencia con las exportaciones peruanas, Importación Mundial de Palta, Evolución de las exportaciones, las Perspectivas del Mercado Chino para la palta Peruana.

  3. La Orientación emprendedora y de mercado en la empresa social vs la de mercado: un estudio de caso

    OpenAIRE

    Rodríguez Moreno, Ramón Enrique

    2016-01-01

    El presente trabajo de investigación llevará a cabo una identificación y delimitación de los aspectos fundamentales de las orientaciones emprendedora y de mercado, así como una caracterización y una diferenciación de las empresas de economía social y de mercado. El objetivo es analizar las posibles diferencias de ambos tipos de orientaciones en función del tipo de empresa. Para ello, se ha realizado dos estudios de caso, uno para cada tipo de empresa. , las conclusiones obtenidas indican un a...

  4. Estudio de Mercado para Desarrollar el Proyecto de Exportación de Mermeladas Orgánicas Motuche Gourmet al Mercado de Alemania

    OpenAIRE

    Dávila Moreno, Andrea; Espinosa Cordero, Denise

    2010-01-01

    La empresa familiar Indartbio, bajo la marca de Motuche Gourmet, ha lanzado al mercado nacional e internacional sus 6 tipos de mermeladas, que combinan frutas exóticas y dan al consumidor un producto de excelente calidad y con certificación orgánica. En el año 2008, los productos Motuche Gourmet fueron expuestos en la feria BioFach en Alemania, lo que les permitió encontrar sus primeros clientes alemanes y les hizo ver la posibilidad de entrar en dicho mercado con sus mermeladas. Por esta raz...

  5. Integración de los Mercados Accionarios de Chile, Colombia y Perú en el Mercado Integrado Latinoamericano (MILA)

    OpenAIRE

    Eduardo Sandoval Alamos; Arturo Z. Vásquez-Párraga; Rocío Sabat Arriagada

    2015-01-01

    El objetivo de este artículo es evaluar y comparar el grado de integración de los mercados accionarios de Chile, Colombia y Perú, antes y después de la implementación del Mercado Integrado Latinoamericano (MILA). Para este fin se utiliza una versión condicional del CAPM internacional que asume PRSM (precios por riesgo sistemático mundial) constantes versus dos especificaciones alternativas. La primera especificación extiende el modelo base al incorporar variables de segmentación junto al r...

  6. Marketing do mercado de luxo: Estudo de caso Victoria's Secret

    Directory of Open Access Journals (Sweden)

    Ana Francisca Giuliani

    2013-12-01

    Full Text Available Este artigo teve por objetivo identificar quais são as estratégias de marketing utilizadas pela empresa varejista Victoria’s Secret para a fidelização do consumidor de luxo em nível global. O estudo caracterizou-se como uma pesquisa qualitativa, utilizando-se como estratégia de campo o estudo de caso de caráter ilustrativo. Para o alcance do objetivo proposto, dividiu-se o estudo em duas fases. Na primeira, denominada exploratória, buscou-se em dados secundários o embasamento para a construção do referencial teórico. Na segunda, adotou-se a técnica de pesquisa por observação, utilizando-se os sites da Victoria’s Secret, e analisou-se o composto de marketing aplicado ao mercado de luxo com base no modelo proposto por Nahás (2009. Concluiu-se que as estratégias da referida empresa se baseiam no luxo acessível, de modo que, além de conquistar o consumidor, a Victoria’s Secret consegue manter sua fidelidade por apresentar estratégias de forte apelo emocional.

  7. Nem Deus nem Mercado: a Campanha da Fraternidade de 2010

    Directory of Open Access Journals (Sweden)

    José Rodorval Ramalho

    2016-05-01

    Full Text Available O presente texto analisa o tema da Campanha da Fraternidade Ecumênica de 2010 “Economia e Vida: Vocês não podem servir a Deus e ao Dinheiro”, promovida, entre outras instituições cristãs, pela Conferência Nacional dos Bispos do Brasil. Partindo dos principais documentos da referida campanha, realizamos uma comparação das categorias econômicas utilizadas com aquelas expressas no corpus da Doutrina Social da Igreja Católica. Concluímos que os bispos brasileiros fazem uso seletivo dos documentos papais, enfatizando as críticas às economias de mercado e realçando a necessidade da defesa de formas coletivistas e igualitaristas das relações econômicas. A base teórica para tais exercícios interpretativos da realidade econômica, sobretudo brasileira, é um marxismo economicista e insensível às mudanças ocorridas na estrutura do capitalismo contemporâneo. Os textos do episcopado brasileiro também ignoram o fracasso das experiências socialistas, sobretudo no século XX.

  8. Growth of a Large Composite Magma System: the EJB Pluton, Eastern California.

    Science.gov (United States)

    Matty, D. J.; Vervoort, J.; Dufrane, A.; Hart, G.; Student, J.; Morgan, S.

    2008-12-01

    The composite EJB pluton crops out in the White-Inyo Mountains of eastern California, and comprises the Eureka Valley monzonite (EVM), the Joshua Flat quartz monzonite (JFQM), the Beer Creek granite (BCG), and an unnamed diorite. While sometimes equivocal, field relationships suggest that the EVM was emplaced first, followed by the JFQM, and finally the BCG; the diorite predates the BCG. Sylvester and others (GSAB, 1978) reported zircon U-Pb ages of 179±2 Ma for the EVM and 174±5 Ma for the JFQM. Coleman and others (GSAB, 2003) determined a U-Pb age of 179±3 Ma (via Pb-loss trajectory) for the BCG. Because of the uncertainty in the ages and ambiguous field relations, the sequence and duration of EJB magmatism remain unclear. To understand more fully the timing of EJB magmatism, we separated zircons from 12 samples collected from each of the main EJB units. These samples were characterized using light microscopy, SEM and CL techniques. U-Pb ages were determined from individual zircons by LA-ICP-MS following the method of Chang and others (G3, 2006). For the ages reported below, the reported uncertainties are based on factors within the analysis, but do not include external factors such as sample/standard bias or other matrix effects. Overall uncertainty in LA-ICPMS U-Pb geochronology is hard to assess, but we estimate that all ages reported below are subject to a minimum 2% uncertainty. We determined a concordant U-Pb age of 180±2 Ma for the EVM, which agrees with the results of Sylvester and others (1978). The unnamed diorite produced a concordant U-Pb age of 177±3 Ma. Concordant U-Pb ages of 172±2, 172±3, 173±2, 174±2, and 175±2 Ma were determined for individual samples of the JFQM and agree with the age reported by Sylvester and others (1978) of 174±5 Ma. Concordant U-Pb ages of 168±4, 168±3, 169±1, 172±2, and 172±2 Ma were determined for individual BCG samples. Within the reported error, there is no difference in age between individual samples of

  9. Carboniferous continental arc in the Hegenshan accretionary belt: Constrains from plutonic complex in central Inner Mongolia

    Science.gov (United States)

    Wei, Ruihua; Gao, Yongfeng; Xu, Shengchuan; Santosh, M.; Xin, Houtian; Zhang, Zhenmin; Li, Weilong; Liu, Yafang

    2018-05-01

    The architecture and tectonic evolution of the Hegenshan accretionary belt in the Central Asian Orogenic Belt (CAOB) remains debated. Here we present an integrated study of zircon U-Pb isotopic ages, whole rock major-trace elements, and Sr-Nd-Pb isotopic data from the Hegenshan volcanic-plutonic belt in central Inner Mongolia. Field observations and zircon U-Pb ages allow us to divide the intrusive complex into an early phase at 329-306 Ma and a late phase at 304 to 299 Ma. The intrusive bodies belong to two magma series: calc-alkaline rocks with I-type affinity and A-type granites. The early intrusions are composed of granodiorite, monzogranite and porphyritic granite, and the late calc-alkaline intrusions include gabbro though diorite to granodiorite. The calc-alkaline intrusive rocks exhibit a well-defined compositional trend from gabbro to granite, reflecting continuous fractional crystallization. These rocks show obvious enrichment in LILEs and LREEs and relative depletion of HFSEs, typical of subduction-related magma. They also exhibit isotopic characteristics of mantle-derived magmas such as low initial 87Sr/86Sr (0.7029-0.7053), positive ɛNd(t) values (0.06-4.76) and low radiogenic Pb isotopic compositions ((206Pb/204Pb)I = 17.907-19.198, (207Pb/204Pb)I = 15.474-15.555, (208Pb/204Pb)I = 37.408-38.893). The marked consistency in geochemical and isotopic compositions between the intrusive rocks and the coeval Baoligaomiao volcanic rocks define a Carboniferous continental arc. Together with available regional data, we infer that this east-west trending continental arc was generated by northward subduction of the Hegenshan ocean during Carboniferous. The late alkali-feldspar granites and the high-Si rhyolites of the Baoligaomiao volcanic succession show similar geochemical compositions with high SiO2 and variable total alkali contents, and low TiO2, MgO and CaO. These rocks are characterized by unusually low Sr and Ba, and high abundances of Zr, Th, Nb, HREEs

  10. Late magmatic stage of the zoned Caleu pluton (Central Chile): insights from zircon crystallization conditions

    Science.gov (United States)

    Molina, P. G.; Parada, M.; Gutierrez, F. J.; Chang-Qiang, M.; Jianwei, L.; Yuanyuan, L.

    2012-12-01

    The Caleu pluton consists of three N-S elongated lithological zones: Gabbro-Diorite Zone (GDZ), Tonalite Zone (TZ) and Granodiorite Zone (GZ); western, middle and eastern portions of the pluton, respectively. The zones are thought to be previously differentiated in a common, isotopically depleted (Sr-Nd), subjacent magma reservoir at a 4 kbar equivalent depth. The emplacement should have occurred at the climax of the Cretaceous rifting. We present preliminary results of U238/Pb206 zircon geochronology; zircon saturation, Tsat(Zrn), and crystallization temperatures (Ti-in-Zrn); as well as relative oxidation states at time of crystallization, based on: (i) the sluggish REE and HFSE subsolidus diffusivities in zircon; (ii) the behavior of Ti4+↔Si4+ and Ce4+↔Zr4+ isovalent replacement, in addition to a constrained TiO2 activity in almost all typical crustal rocks; and (iii) relative oxidation states at time of crystallization, respectively. The latter are obtained by interpolation of the partition coefficients of trivalent (REE) and tetravalent (HFSE) curves in Onuma diagrams for each zircon, and then estimating relative Ce(IV)/Ce(III) ratios. Results obtained from 4 samples (a total of 77 zircon grains) collected from the three mentioned lithological zones indicate U/Pb ages of approximately 99.5 ±1.5 Ma, 96.8 ±0.6 Ma, and 94.4 +2.2 -0.8 Ma; and Ti-in Zrn ranges of ca. 720-870°C, ca. 680-820°C and ca. 750-840°C, for the GDZ, TZ and GZ samples, respectively. On the other hand Tsat(Zrn) of ca. 750-780°C in the TZ, and ca. 830-890°C in the GZ, were obtained. As expected saturation temperatures are similar or higher than Ti-in-Zrn obtained in zircon grains of TZ and GZ, respectively. Cathodoluminiscence images in zircon suggest a magmatic origin, due to absence of complex zoning patterns and fairly well conserved morphologies. Exceptionally the GDZ sample zircons show evidence of inheritance, indicating a xenocrystic and/or antecrystic origin. A relative Ce

  11. Indoor radon related to uranium in granitoids of the Central Bohemian plutonic complex

    International Nuclear Information System (INIS)

    Barnet, I.; Fojtikova, I.

    2004-01-01

    The study is based on the indoor radon data (one year measurements, Kodak LR 115 track etch detectors), vectorized geological maps 1:50000, vectorized coordinates of dwellings and uranium data for granitoid types of the Central Bohemian Plutonic Complex (CBPC). Using ArcGis 8.2 programme, the position of 16145 dwellings was linked to a geological database covering the CBPC (approx. 3200 km 2 ), and the type of underlying rock type was specified for each house. The resulting databases enabled us to calculate the mean EEC indoor Rn data for particular granitoid types and to study the relationship between the indoor Rn and the U concentrations. The petrogenetically variable CBPC was emplaced during Variscan orogenesis (330-350 Ma) and is among the most radioactive rock types within the Bohemian Massif. A long-term process of CBPC genesis resulted in more than 20 granitoid types, differing by their petrogenetic characteristics as well as mineralogical and chemical composition, including uranium concentration. The relation between the mean indoor radon values and uranium concentrations in particular rock types was examined. A positive regression between indoor Rn and uranium as the source of Rn soil gas clearly demonstrates how regional geology influences the indoor radon activity concentration in dwellings. The highest indoor Rn concentrations were observed in the Sedlcany granodiorite and Certovo bremeno syenite, where also the highest gamma dose rates (150-210 nGy.h -1 ) within all granitoid types in the Czech Republic were observed. The two rock types differ from other granitoids by a relatively high zircon concentration, which is the main source of U and subsequently of soil gas Rn being released from the bedrock. The lower indoor Rn values of Certovo bremeno syenite which do not correspond with the high U concentrations can be explained by a relatively low permeability of its clayey weathering crust. This feature was also observed for soil gas radon concentration

  12. Death Valley turtlebacks: Mesozoic contractional structures overprinted by Cenozoic extension and metamorphism beneath syn-extensional plutons

    Energy Technology Data Exchange (ETDEWEB)

    Pavlis, T L; Serpa, L [Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 7996 (United States); Miller, M [Department of Geological Sciences, University of Oregon, Eugene, OR 97403 (United States)], E-mail: tlpavlis@utep.edu

    2008-07-01

    The term turtleback was first coined to describe the curvilinear fault surfaces that produced a distinctive geomorphic form in the Black Mountains east of Death Valley, and although it was decades before their full significance was appreciated, they remain one of the most distinctive features of the extensional structure of the Death Valley region. Historically the interpretation of the features has varied markedly, and misconceptions about their character continue to abound, including descriptions in popular field guides for the area. It the 1990's, however, the full history of the systems began to be apparent from several key data: 1) the dating of the plutonic assemblage associated with the turtlebacks demonstrated that late Miocene, syn-extensional plutonism was fundamental to their formation; 2) the plutonic assemblage forms an intrusive sheet structurally above the turtlebacks, indicating a tie between much of the high grade metamorphism and Cenozoic plutonism; 3) a modern analog for the syn-extensional plutonism in the Black Mountains was recognized beneath Death Valley with the imaging of a mid-crustal magma body; 4) the Neogene structural history was worked out in the turtlebacks showing that folding of early-formed shear zones formed the turtleback anticlinoria but overprinting by brittle faults produced the final form as they cut obliquely across the older structure; and 5) the pre-extensional structural history was clarified, demonstrating that Mesozoic basement-involved thrust systems are present within the turtlebacks, but have been overprinted by the extensional system. An unresolved issue is the significance of Eocene U-Pb dates for pegmatites within the region, but presumably these relate somehow to the pre-extensional history. Miller and Pavlis (2005; E. Sci. Rev.) reviewed many features of the turtlebacks, and our working model for the region is that the turtlebacks originated as mid-crustal ductile-thrust systems within the Cordilleran fold

  13. Death Valley turtlebacks: Mesozoic contractional structures overprinted by Cenozoic extension and metamorphism beneath syn-extensional plutons

    International Nuclear Information System (INIS)

    Pavlis, T L; Serpa, L; Miller, M

    2008-01-01

    The term turtleback was first coined to describe the curvilinear fault surfaces that produced a distinctive geomorphic form in the Black Mountains east of Death Valley, and although it was decades before their full significance was appreciated, they remain one of the most distinctive features of the extensional structure of the Death Valley region. Historically the interpretation of the features has varied markedly, and misconceptions about their character continue to abound, including descriptions in popular field guides for the area. It the 1990's, however, the full history of the systems began to be apparent from several key data: 1) the dating of the plutonic assemblage associated with the turtlebacks demonstrated that late Miocene, syn-extensional plutonism was fundamental to their formation; 2) the plutonic assemblage forms an intrusive sheet structurally above the turtlebacks, indicating a tie between much of the high grade metamorphism and Cenozoic plutonism; 3) a modern analog for the syn-extensional plutonism in the Black Mountains was recognized beneath Death Valley with the imaging of a mid-crustal magma body; 4) the Neogene structural history was worked out in the turtlebacks showing that folding of early-formed shear zones formed the turtleback anticlinoria but overprinting by brittle faults produced the final form as they cut obliquely across the older structure; and 5) the pre-extensional structural history was clarified, demonstrating that Mesozoic basement-involved thrust systems are present within the turtlebacks, but have been overprinted by the extensional system. An unresolved issue is the significance of Eocene U-Pb dates for pegmatites within the region, but presumably these relate somehow to the pre-extensional history. Miller and Pavlis (2005; E. Sci. Rev.) reviewed many features of the turtlebacks, and our working model for the region is that the turtlebacks originated as mid-crustal ductile-thrust systems within the Cordilleran fold

  14. Indoor radon risk associated to post-tectonic biotite granites from Vila Pouca de Aguiar pluton, northern Portugal.

    Science.gov (United States)

    Martins, L M O; Gomes, M E P; Teixeira, R J S; Pereira, A J S C; Neves, L J P F

    2016-11-01

    At Vila Pouca de Aguiar area, northern Portugal, crops out a post-tectonic Variscan granite pluton, related with the Régua-Vila Real-Verín fault zone, comprising three types of biotite granites. Among these granites, PSG granite yield the highest average contents of U, probably due to its enrichment in accessory U-bearing minerals such as zircon. In the proximity of faults and joints, these granites are often affected by different degrees of hydrothermal alteration, forming reddish altered rocks, commonly known as "episyenites". These altered rocks are probably associated to the occurrence of hydrothermal processes, which led to uranium enrichment in the most advanced stages of episyenitization. In these granites, both average gamma absorbed dose rates in outdoor and indoor air are higher than those of the world average. Furthermore, even in the worst usage scenario, all these granites can be used as a building material, since their annual effective doses are similar to the limit defined by the European Commission. The geometric mean of radon activity of 91 dwellings located at the Vila Pouca de Aguiar pluton is 568Bqm(-3), exceeding that of other northern Portuguese granites. Measurements carried out during a winter season, indicate that 62.6% of the analysed dwellings yield higher indoor radon average values than the Portuguese legislation limit (400Bqm(-3)), and annual effective doses due higher than the world's average value (1.2mSvy(-1)). The interaction of geogenic, architectural and anthropogenic features is crucial to explain the variance in the geometric mean of radon activity of dwellings from Vila Pouca de Aguiar pluton, but the role of geologic faults is probably the most important decisive factor to increase the indoor radon concentration in dwellings. Hence, the development of awareness campaigns in order to inform population about the incurred radiological risks to radon exposure are highly recommended for this specific area. Copyright © 2016

  15. Petrography and geochemistry of granitoids from the Samphire Pluton, South Australia: Implications for uranium mineralisation in overlying sediments

    Science.gov (United States)

    Domnick, Urs; Cook, Nigel J.; Bluck, Russel; Brown, Callan; Ciobanu, Cristiana L.

    2018-02-01

    The Blackbush uranium deposit (JORC Inferred Resource: 12,580 tonnes U), located on the north-eastern Eyre Peninsula, is currently the only sediment-hosted U deposit investigated in detail in the Gawler Craton. Uranium is hosted within Eocene sandstone of the Kanaka Beds, overlying Mesoproterozoic granites of the Samphire pluton, affiliated with the Hiltaba Intrusive Suite ( 1.6 Ga). These are considered the most probable source rocks for uranium mineralisation. By constraining the petrography and mineralogy of the granites, insights into the post-emplacement evolution can be gained, which may provide an exploration indicator for other sediment-hosted uranium systems. Three geochemically distinct granite types were identified in the Samphire Pluton and correspond to domains interpreted from geophysical data. All granites show complex alteration overprints and textures with increasing intensity closer to the deposit, as well as crosscutting veining. Alkali feldspar has been replaced by porous K-feldspar and albite, and plagioclase is overprinted by an assemblage of porous albite + sericite ± calc-silicates (prehnite, pumpellyite and epidote). This style of feldspar alteration is regionally widespread and known from Hiltaba-aged granites associated with iron-oxide copper-gold mineralisation at Olympic Dam and in the Moonta-Wallaroo region. In two granite types biotite is replaced by calcic garnet. Calc-silicates are indicative of Ca-metasomatism, sourced from the anorthite component of altered plagioclase. Minor clay alteration of feldspars is present in all samples. Mineral assemblages in veins include quartz + hematite, hematite + coffinite, fluorite + quartz, and clay minerals. Minor chlorite and sericite are found in all vein types. All granite types are anomalously rich in U (concentrations between 10 and 81 ppm). Highly variable Th/U ratios, as well as hydrothermal U minerals (mostly coffinite) in granites and veins, are clear evidence for U mobility. Uranium

  16. El lago Chinchaycocha en el mercado de bonos de carbono

    Directory of Open Access Journals (Sweden)

    Wilfredo Bulege Gutiérrez

    2012-12-01

    inviertencapitales en los países subdesarrollados para reducir en su favor las emisiones de GEI. Esta iniciativa ha generado un mercado de compra y venta de certificados de emisiones reducidas (CER. Nuestro país tiene enormes posibilidades para captar estos recursos. Se trata, entonces, de una oportunidad para ingresar a este mercado y generar importantes recursos que pueden ser invertidos en mayor investigación, desarrollo e innovación (I+D+i en los mismos procesos de adaptación y mitigación del cambio climático.

  17. Nuestra obsoleta mentalidad de mercado Our obsolete market mentality

    Directory of Open Access Journals (Sweden)

    Polanyi Karl

    1994-06-01

    Full Text Available Karl Polanyi es poco conocido entre los economistas, aunque sea muy influyente en otras disciplinas. El derrumbamiento de los regímenes orientales de Europa Oriental ha renovado el interés en sus trabajos: ante todo entre quienes intentan justificar la ineficiencia económica de los regímenes totalitarios, apoyan el restablecimiento de los derechos humanos y buscan que los gobiernos sean responsables ante los ciudadanos, sin confiar críticamente sobre las fuerzas de mercado. Su obra empieza a ser consultada por quienes buscan alternativas para modernizar las sociedades latinoamericanas sin olvidar las complejas necesidades del ser humano. Las tradiciones liberales son insuficientes aquí y allá: no se pueden abandonar las libertades individuales, pero éstas deben ser recreadas; no se puede restaurar un sistema social obsoleto, cuyos males oculta la bruma de la ideología; la sociedad debe reconstruirse aprendiendo las lecciones que somos capaces de aprender; por ejemplo, que la motivaciones humanas no se circunscriben a una sola institución, la del mercado autoregulado, donde el hambre y la ganancia son los móviles aparentes del trabajo y la eficiencia. Esperar que el progreso y la paz mundial se logren a través del comercio es una ingenuidad engañosa y nociva. Ni un sistema nacional ni un sistema internacional pueden depender de reguladores automáticos. Los presupuestos equilibrados, la libre empresa, los tipos de cambio flexibles no garantizan el orden internacional. Sólo la sociedad puede garantizarlo, de modo que la sociedad internacional también debe ser recreada, creando las instituciones reguladoras adecuadas.Karl Polanyi is little-known among economists, though highly influential in other disciplines. The crumbling of the Eastern European regimes has renewed interest in his work, especially among those who, without wishing to justify the economic inefficiencies of the totalitarian regimes, support the restoration of human

  18. The use of borehole geophysical logs and hydrologic tests to characterize plutonic rock for nuclear fuel waste disposal

    International Nuclear Information System (INIS)

    Davison, C.C.

    1984-05-01

    The selection of an igneous rock body for the disposal of nuclear fuel waste will likely require the drilling and testing of a number of deep investigative boreholes in the rock body. Although coring of at least one hole at each Research Area will be essential, methods for making in situ geophysical and hydrological measurements can substitute for widespread coring and result in significant savings in time and money. A number of borehole methods have been applied to the investigation of plutonic rocks at Whiteshell Nuclear Research Establishment and Chalk River Nuclear Laboratories in Canada

  19. LA MUJER EN EL MERCADO LABORAL ESPAÑOL

    Directory of Open Access Journals (Sweden)

    Elvira López Díaz

    2013-05-01

    Full Text Available Este estudio tiene por objeto mostrar a grandes rasgos la participación femenina en el mercado laboral español y cuáles son los retos u oportunidades que tienen las mujeres ante sí, resaltando los elementos de cambio y de continuidad observados en los últimos años en nuestra sociedad. Para poder comprender la situación actual en la que se encuentra el colectivo femenino se realiza un análisis partiendo de la normativa aplicable, donde el principal referente es nuestra Constitución Española, que sanciona cualquier tipo de discriminación por razón del sexo, y se describen las reformas estructurales que se han ido produciendo en materia de empleo e igualdad de oportunidades, sin olvidar el papel que, en general, las Administraciones Públicas deben desarrollar en la consecución de una igualdad real y efectiva entre mujeres y hombres, en el marco de un Estado Social y Democrático de Derecho como es el nuestro. The aim of this paper is to show in general terms the female participation in the Spanish labor market and what challenges and opportunities women face, highlighting the elements of change and continuity observed in recent years in our society. To understand the present situation of the female collective, an analysis has been done based on the applicable regulations, where the main reference is our Spanish Constitution which penalizes any discrimination by sex. The analysis describes the structural reforms that have occurred regarding to employment and equal opportunities, not to mention the role that should be developed by the Public Administration in order to ensure equal opportunities between women and men, within the framework of a democratic society governed by the rule of law.

  20. Mercados educacionais e a comunidade Education markets and the community

    Directory of Open Access Journals (Sweden)

    Sally Power

    2003-09-01

    Full Text Available Os defensores de abordagens baseadas no mercado para a educação invocam, às vezes, a necessidade de "empoderamento" (empowerment das comunidades nas tomadas de decisão educacionais para justificar a reforma dos sistemas educacionais públicos convencionais. Com base em exemplos da Austrália, da Inglaterra e do País de Gales, da Nova Zelândia e dos eua, este artigo explora as maneiras complexas e contraditórias como as políticas educacionais contemporâneas usam o conceito de envolvimento das comunidades. Ele demonstra mais ainda que o papel e o impacto do envolvimento das comunidades nas escolas nada têm de simples. O artigo conclui que, se o envolvimento das comunidades quer ter efeitos progressistas, ele deve ser articulado com uma política de educação democrática mais ampla.The proponents of market-based approaches to education have sometimes invoked the need for community empowerment in educational decision-making to justify the reform of conventional state educational systems. Drawing upon examples from Australia, England and Wales, New Zealand and the usa, this paper explores the complex and contradictory ways in which the concept of community involvement is used in contemporary education policy. It further demonstrates that the role and impact of community involvement in schools are by no means straightforward. The paper concludes that, if community involvement is to be progressive in its effects, it will need to be articulated with a broader democratic politics of education.

  1. OS MERCADOS PÚBLICOS E A CIDADE: as transformações do Mercado Municipal de Uberlândia (MG

    Directory of Open Access Journals (Sweden)

    Lidiane Aparecida Alves

    2011-10-01

    Full Text Available É consenso a relação das atividades comerciais com a estruturação das cidades. Desde as primeiras cidades o mercado, enquanto forma e função, apresenta papel de destaque nesse processo. Todavia, enquanto palco, e ao mesmo tempo, condicionante para a reprodução das relações sociais, a cidade e seus múltiplos usos apresentam-se em constante transformação de acordo com os anseios da sociedade ao longo de cada período histórico. Sendo que, nos mercados públicos, espaços voltados não só para a comercialização, mas também para a socialização, é possível apreender elementos e produtos típicos de uma dada cidade, região ou país, os quais são cada vez mais valorizados enquanto mercadorias capazes de atrair fluxos e assegurar a permanência dos destes nos dias atuais. Neste sentido, este trabalho tem como objetivo analisar a dinâmica do Mercado Municipal de Uberlândia a fim de compreender o papel do Mercado Municipal ao longo de sua existência. Para tanto fez-se necessário a realização de um levantamento do referencial teórico a cerca da temática em questão, bem como de trabalhos de campo. A partir da concretização desse trabalho tem-se que o Mercado Municipal de Uberlândia assumiu distintas configurações, de acordo com os desígnios dos períodos históricos.

  2. Estrategia de Cobertura a Través de Contratos Forward en Mercados Eléctricos

    OpenAIRE

    Trespalacios Carrasquilla, Alfredo; Rendón García, Juan Fernando; Pantoja Robayo, Javier Orlando

    2012-01-01

    Quienes transan electricidad en los mercados liberalizados, est an ex- puestos a riesgos que requieren un an alisis y tratamiento diferente al de otro tipo de commodities. La din amica del precio spot, unida a la necesi- dad de completar el mercado cubriendo la exposici on al riesgo de volumen, son entre otras las caracter sticas que hacen a este mercado diferente y complejo. Nuestro trabajo presenta un esquema de cobertura est atica que puede implementar un agente que busc...

  3. Petrographical and geochemical characterization and deformation conditions of the San Cristobal pluton, Sierra de Velasco, La Rioja, Argentina; Caracterizacion petrografica y geoquimica y condiciones de deformacion del pluton San Cristobal, Sierra de Velasco, La Rioja, Argentina

    Energy Technology Data Exchange (ETDEWEB)

    Bellos, L.I.; Toselli, A.J.; Rossi, J.N.; Grosse, P.; Rosa, J.D. de la; Castro, A.

    2010-07-01

    The San Cristobal pluton is a 35 km2 granitic body that outcrops at the southestern tip of the Sierra de Velasco, located west of La Rioja city, Argentina. It is formed by monzogranites and syenogranites, together with scarce granodiorites, with medium to fine-grained, equigranular to slightly porphyritic textures. Their mineral assemblage consists of quartz + microcline + plagioclase + biotite {+-} muscovite + zircon + apatite + magnetite. The granite contains dioritic to tonalitic mafic enclaves. The central and eastern parts of the granite have been deformed by the NNW-SSE trending South Mylonitic shear zone formed by mylonitic rocks. The metamorphic host-rock is represented by scarce greenschist facies xenoliths and hornfels with the high T/P assemblage K-feldspar - cordierite - biotite {+-} sillimanite. The granites are calc-alkaline, weak- to moderately peraluminous, and formed as part of a continental magmatic arc developed along the active margin of western Gondwana during the Early Paleozoic. The depth of emplacement of the San Cristobal pluton is estimated at {approx}12 km. (Author).

  4. Characteristics of Young Rhyolites at Taupo, New Zealand: Implications for the Sub-Surface Plutonic System

    Science.gov (United States)

    Wilson, C. J.; Charlier, B. L.

    2007-12-01

    The young history of Taupo volcano captures the growth and destruction in the 26.5 ka ca. 530 km3 Oruanui eruption of a large rhyolitic magma body, together with the subsequent rejuvenation of magma sources below the volcano. Integration of field information with petrological and isotopic studies at the whole-pumice and single- crystal scales provide a picture of this history. Several important contrasts are inferred to exist between Taupo and comparably-sized, long-lived silicic foci such at Long Valley and in the Bishop Tuff. At Taupo the following are demonstrable. 1. Even in crystal-poor rhyolites like the Oruanui, many grains are inherited antecrysts or xenocrysts. The Oruanui crystal-poor rhyolite body was an open system, with influxes of crystals (plus melt) from remobilised older crystal mush, melted metasedimentary country rocks and plutonics, and crystal-poor basaltic to andesitic magmas. 2. All the Taupo rhyolites were well mixed prior to eruption, and there are no gradients in the eruption products to suggest that the holding chamber(s) were stratified to any extent. 3. Mafic magmas rose into, interacted with, and ponded on the floors of crystal-poor rhyolite in the Oruanui and Waimihia (3.5 ka) examples, again implying that the chamber floor was sharply defined, not a gradual progression down into a more crystal- rich root zone. 4. Pre-Oruanui activity involved contrasting magma types being generated simultaneously, but erupting from geographically separated vents. Post-Oruanui activity has seen (subtly) contrasting magma groups being erupted from vents in the same geographic area, but separated in time. The Oruanui and post-Oruanui magmas are different and do not appear to be related by consanguinity or by mixing - the Oruanui eruption effectively destroyed its magma body. These features are consistent with rhyolite magma generation at Taupo that is exceptionally fast, driven by high fluxes of mafic magmas into a highly heterogeneous crustal melange

  5. The late-Variscan peraluminous Valdepeñas pluton (southern Central Iberian Zone)

    Energy Technology Data Exchange (ETDEWEB)

    Errandonea-Martín, J.; Carracedo-sánchez, M.; Sarrionandia, F.; Santos Zalduegui, J.F.; García de Madinabeitia, S.; Gil-Ibarguchi, J.I.

    2017-07-01

    The Valdepeñas pluton is the easternmost outcrop of the Cáceres-Valdepeñas magmatic alignment (southern Central Iberian Zone). This massif is constituted by a cordierite-bearing porphyritic monzogranite and may be grouped within the so-called “Serie Mixta” granitoids. The Valdepeñas monzogranite is of magnesian [FeOt/(FeOt+MgO)~0.76], alkali-calcic [(Na2O+K2O)–CaO=7.8–8.5] and peraluminous (A/CNK=1.14–1.20). Multielemental- and REE-normalized patterns are comparable to those of similar rocks in the Nisa- Alburquerque-Los Pedroches magmatic alignment, and slightly differ from those of the Montes de Toledo batholith, both in the southern Central Iberian Zone. The U-Pb zircon age of 303±3Ma is consistent with the late-orogenic character of the intrusion and is in accordance with most of the granitic peraluminous intrusions in the southern Central Iberian Zone. 86Sr/87Sr300Ma ratios (0.707424–0.711253), εNd300Mavalues (-5.53 to -6.68) and whole-rock major and trace element compositions of the studied rocks, suggest that the parental magma of the Valdepeñas monzogranite could derive from a crustal metaigneous source. The U-Pb ages (552–650Ma) of inherited zircon cores found in Valdepeñas monzogranite samples match those often found in Lower Paleozoic metavolcanics and granitic orthogneisses of Central Iberia and, furthermore, point to Upper Neoproterozoic metaigneous basement rocks as possible protoliths at the magma source. Based on the solubility of monazite in peraluminous melts, the estimated emplacement temperature of the studied monzogranite is 742–762ºC. The results obtained in this work would contribute to a better understanding of the origin of the “Serie Mixta” granitoids.

  6. Estrategia de cobertura a través de contratos a plazo en mercados eléctricos.

    OpenAIRE

    Trespalacios Carrasquilla, Alfredo; Rendón García, Juan Fernando; Pantoja, Javier

    2012-01-01

    Quienes transan electricidad en los mercados liberalizados, están expuestos a riesgos que requieren un análisis y tratamiento diferente al de otro tipo de productos básicos (commodities). La dinámica del precio actual del mercado (spot), unida a la necesidad de completar el mercado cubriendo la exposición al riesgo de volumen son, entre otras, las características que hacen a este mercado diferente y complejo. Nuestro trabajo muestra un esquema de cobertura estática que puede implementar un ag...

  7. Dimensiones simbólicas de las prácticas de intercambio en mercados de Buenos Aires y Viena.

    Directory of Open Access Journals (Sweden)

    Tihomir Viderman

    2014-12-01

    Full Text Available Este artículo explora dos mercados en dos continentes diferentes, el “Mercado Solidario Bonpland” en Buenos Aires (Argentina y el “Mercado de los agricultores del centro socio-cultural WUK” en Viena (Austria, con el propósito de indagar en las dimensiones simbólicas de las prácticas de la vida cotidiana, que se desarrollan en estos mercados. La particularidad es que estos mercados fueron originados y sostenidos por grupos de activistas locales para promover y apoyar la participación y el intercambio social. Aunque estos dos mercados difieren en su apariencia, los significados y las ideas conceptuales detrás de cada uno, reflejan propuestas similares hacia la consolidación de prácticas culturales alternativas, lo que conduce a que los mercados se tornen como lugares de intercambio y encuentro social relevantes para la comunidad local. En el artículo se abordan las “prácticas de intercambio” halladas en los mercados como acciones estratégicas que permiten obtener un medio de vida y un espacio de pertenencia social. Los actores involucrados en la producción de los mercados analizados, muestran a la performatividad como una faceta esencial de la producción de significados simbólicos, con la capacidad de generar un espacio para el fomento y desarrollo de posibles prácticas emancipatorias.

  8. PLUTON: A Three-Group Model for the Radial Distribution of Plutonium, Burnup, and Power Profiles in Highly Irradiated LWR Fuel Rods

    International Nuclear Information System (INIS)

    Lemehov, Sergei; Nakamura, Jinichi; Suzuki, Motoe

    2001-01-01

    A three-group model (PLUTON) is described, which predicts the power density distribution, plutonium buildup, and burnup profiles across the fuel pellet radius as a function of in-pile time and parameters characterizing the type of reactor system with respect to fuel temperature and changes of density during the irradiation period. The PLUTON model is a part of two fuel performance codes (ASFAD and FEMAXI-V), which provide all necessary input for this model, mainly local temperatures and fuel matrix density across the radius. Comparisons between measurements and predictions of the PLUTON model are made on fuels with enrichments in the range 2.9 to 8.25% and with burnup between 21 000 and 64 000 MWd/t. It is shown that the PLUTON predictions are in good agreement with measurements as well as with predictions of the well-known TUBRNP model. The proposed model is flexibly applicable for all types of light water reactor (LWR) fuels, including mixed oxide, and for fuel tested in the Organization for Economic Corporation and Development's Halden heavy water reactor. The PLUTON three-group model is based on analytical (theoretical) consideration of neutron absorption in a resonant region of the fuel in its apparent form. It makes the model more flexible in comparison with the semi-empirical TUBRNP one-group model and allows the physically based model analysis of commercial LWR-type fuels at high burnup as well as analysis of experimental fuel rods tested in the Halden heavy water reactor, which is one of the main test reactors in the world. The differences in fuel behavior in the Halden reactor in terms of burnup distribution and plutonium buildup can be more clearly understood with the PLUTON model

  9. Isotopic characteristics (Nd and Sr) of the intrusive plutonism at the northwestern Amazonian Craton, Venezuela, and implications for the Paleoproterozoic evolution

    International Nuclear Information System (INIS)

    Teixeira, Wilson; Tassinari, Colombro Celso G.; Mondin, M.

    2002-01-01

    Nd and Sr analyses were performed on selected granitoid plutons that intrude Archean and Paleoproterozoic domains of the Guyana shield (Venezuela). The isotopic signatures of these plutons together with the geochronologic background of the country rocks are used to constrain their magma genesis and tectonic setting within the Paleoproterozoic evolutions of mobile belts (Maroni-Itacaiunas and Ventuari-Tapajos provinces) of the Amazonian Craton. The Encrucijada Suite (2187 +- 94 Ma), which intrudes Archean rocks of the Imataca Complex, originated predominantly from partial melt of this crust, as supported by negative epsilon Nd(2.1Ga ) values (-2.2 to - 4.9) and T DM ages between 2.82 and 2.49 Ga. Conversely, the plutons from the Supamo Complex (2230 - 2050 Ma) and Cuchivero Group (1980 - 1830 Ma), occurring within the adjoining Paleoproterozoic provinces, are juvenile in nature (derived from roughly contemporary protoliths). These bodies display T DM ages between 2.13 and 2.22 Ga, as well as positive epsilon Nd(2.1Ga ) values (+0.74 to + 3.05). Isotopic correlation diagrams 143 Nd/144 Nd vs. 147 Sm/144 Nd and 143 Nd/144 Nd vs. time) plotted together with the plutonic rocks and Imataca Complex rocks were evaluated taking into account the geologic background of the NW part of the Amazonian Craton. Interpretation of these isotopic data supports the idea of tectonic juxtaposition between the Imataca Complex and the Maroni-Itacaiunas province during the Transamazonian orogeny (2.25 - 2.05 Ga). On the other hand, the Cuchivero Group plutons have a contrasting isotopic signature compared to the other Paleoproterozoic plutonic rocks. This is consistent with the existence of a tectonic boundary between the Maroni-Itacaiunas and the Ventuari-Tapajos province in the late Paleoproterozoic. (author)

  10. El papel del mercado en la construcción de organizaciones sustentables

    Directory of Open Access Journals (Sweden)

    Dante David Solís Santamaría

    2017-01-01

    Full Text Available El objetivo del artículo es discutir cómo el mercado propicia modificaciones estructura-les en las organizaciones que agilizan su tránsito hacia la sustentabilidad. Se discute y propone una estructura analítica que es contrastada en la producción de uva de mesa en Hermosillo, Sonora. La metodología con-siste en un análisis indirecto sobre las condi-ciones de mercado del sistema uva de mesa y un panel de entrevistas que incluyen el perfil del puesto, gerencia, mercado y toma de deci-siones realizadas a dieciocho gerentes selec-cionados de una población de 39 organizacio-nes productoras de uva de mesa con una muestra estadística al 95% de confianza y 7% de error. Resultados: La evidencia empírica señala que las condiciones de mercado actua-les se expresan en rigurosas certificaciones en los campos de responsabilidad social, inocui-dad, calidad, seguridad y producción orgáni-ca. Limitaciones: durante la investigación surgieron complicaciones logísticas que obli-garon a modificar la muestra. Conclusiones: las condiciones de mercado han demandado nuevos perfiles y han modificado las formas organizativas, mismas que transitan de es-tructuras verticales hacia estructuras sistémi-cas sustentables: un cambio de empresa a or-ganizaciones sustentables.

  11. Revisión de herramientas aplicadas al modelamiento de mercados de electricidad

    Directory of Open Access Journals (Sweden)

    Sandra Milena Londoño Hernández

    2009-09-01

    Full Text Available La desregulación de los mercados de electricidad alrededor del mundo, en la búsqueda de la eficiencia, ha introducido compe- tencia en los sectores de comercialización y generación de energía. Por esta razón, ha adquirido gran importancia, para regula- dores y oferentes, estudiar la interacción de los agentes competitivos para analizar la evolución del mercado y definir adecuada- mente estrategias de ofertamiento. Por lo tanto, en los últimos años se han utilizado diferentes herramientas para modelar los mercados de electricidad competitivos; este artículo presenta una revisión analítica de la bibliografía encontrada en el tema, en la cual se presentan las herramientas más utilizadas, además de sus ventajas y desventajas. Para realizar este análisis se hicieron comparaciones entre los modelos utilizados en cada herramienta, identificando las principales características del mercado, tales como esquema de mercado, estructura de las ofertas, tipo de subasta, entre otras. De este análisis se concluye que el tipo de herramienta a utilizar depende en gran medida del objetivo y alcance que se busca con el estudio.

  12. Relative contributions of crust and mantle to generation of Campanian high-K calc-alkaline I-type granitoids in a subduction setting, with special reference to the Harsit Pluton, Eastern Turkey

    NARCIS (Netherlands)

    Karsli, O.; Dokuz, A.; Uysal, I.; Aydin, F.; Chen, B.; Kandemir, R.; Wijbrans, J.R.

    2010-01-01

    We present elemental and Sr-Nd-Pb isotopic data for the magmatic suite (~79 Ma) of the Harşit pluton, from the Eastern Pontides (NE Turkey), with the aim of determining its magma source and geodynamic evolution. The pluton comprises granite, granodiorite, tonalite and minor diorite (SiO

  13. Discordant K-Ar ages between hornblende and biotite from the Tanzawa tonalitic pluton in the southern Fossa Magna, central Japan

    International Nuclear Information System (INIS)

    Sato, Kohei; Shibata, Ken; Uchiumi, Shigeru

    1986-01-01

    K-Ar ages were determined for hornblende and biotite in three tonalites from the Tanzawa pluton in the southern Fossa Magna, central Japan. The two minerals show discordant ages of 10.1 and 10.7 Ma for hornblende and 4.6 - 5.1 Ma for biotite. The age data and field evidence indicate that the pluton was emplaced in the Tanzawa Group in Middle Miocene time and its slow cooling (ca. 50 deg C/Ma in average) resulted in younger ages of boitites than hornblendes due to lower closure temperature for biotite. (author)

  14. Volcanic-plutonic connections and metal fertility of highly evolved magma systems: A case study from the Herberton Sn-W-Mo Mineral Field, Queensland, Australia

    Science.gov (United States)

    Cheng, Yanbo; Spandler, Carl; Chang, Zhaoshan; Clarke, Gavin

    2018-03-01

    Understanding the connection between the highly evolved intrusive and extrusive systems is essential to explore the evolution of high silicic magma systems, which plays an important role in discussions of planetary differentiation, the growth of continents, crustal evolution, and the formation of highly evolved magma associated Sn-W-Mo mineral systems. To discern differences between "fertile" and "non-fertile" igneous rocks associated with Sn-W-Mo mineralization and reveal the genetic links between coeval intrusive and extrusive rocks, we integrate whole rock geochemistry, geochronology and Hf isotope signatures of igneous zircons from contemporaneous plutonic and volcanic rocks from the world-class Herberton Mineral Field of Queensland, Australia. The 310-300 Ma intrusive rocks and associated intra-plutonic W-Mo mineralization formed from relatively oxidized magmas after moderate degrees of crystal fractionation. The geochemical and isotopic features of the coeval volcanic succession are best reconciled utilizing the widely-accepted volcanic-plutonic connection model, whereby the volcanic rocks represent fractionated derivatives of the intrusive rocks. Older intrusions emplaced at 335-315 Ma formed from relatively low fO2 magmas that fractionated extensively to produce highly evolved granites that host Sn mineralization. Coeval volcanic rocks of this suite are compositionally less evolved than the intrusive rocks, thereby requiring a different model to link these plutonic-volcanic sequences. In this case, we propose that the most fractionated magmas were not lost to volcanism, but instead were effectively retained at the plutonic level, which allowed further localized build-up of volatiles and lithophile metals in the plutonic environment. This disconnection to the volcanism and degassing may be a crucial step for forming granite-hosted Sn mineralization. The transition between these two igneous regimes in Herberton region over a ∼30 m.y. period is attributed to

  15. Isotopic studies of the Eye-Dashwa Lakes pluton and the long-term integrity of whole-rock and mineral systems

    International Nuclear Information System (INIS)

    Peterman, Z.E.; Kamineni, D.C.

    1990-05-01

    This report presents results of isotopic studies of the Eye-Dashwa Lakes pluton, located near Atikokan, Ontario. Suites of pristine unaltered and highly altered core samples from deep boreholes were used to study Rb-Sr, U-Th-Pb and Sr-Nd systematics, whole-rock Pb isotopes and fission track dating of apatite. The results have been used to investigate natural analogues for radionuclide migration in the geosphere, the tectonic stability of the pluton and the extent of water-rock interaction in fracture zones

  16. Microstructures and magnetic fabrics of the Ngaoundéré granite pluton (Cameroon): Implications to the late-Pan-African evolution of Central Cameroon Shear Zone

    Science.gov (United States)

    Dawaï, Daouda; Tchameni, Rigobert; Bascou, Jérome; Awe Wangmene, Salomon; Fosso Tchunte, Périclex Martial; Bouchez, Jean-Luc

    2017-05-01

    The Ngaoundéré granite pluton, in Central-North Cameroon, located near the Central Cameroon Shear zone (CCSZ), and previously studied for its petrography and geochemistry, is characterized by the absence of macroscopic markers of deformation. In this study, we report microstructures and magnetic fabrics (AMS) of this pluton and discuss the relationship with the Pan-African evolution of the CCSZ. The pluton consists of a porphyritic Hbl-Bt-monzogranite at its rim and a porphyritic biotite-granite at its core, a petrographic distribution denoting a normal zoning pattern, i.e. more silicic toward the centre. As expected, magnetic susceptibilities values also exhibit a zoning pattern in agreement with petrographic zonation. Thermomagnetic data indicate that this pluton is dominantly ferromagnetic in behaviour. As indicated by its microstructures, the pluton has suffered a continuum of deformation from the magmatic state to the high temperature solid-state during magma crystallization and solidification. The magnetic foliations dominantly strike NE-SW and dip moderately to steeply and the lineations mostly plunge shallowly to the NE or SW, roughly parallel to NE-to ENE-trending Central Cameroun Shear Zone (CCSZ). The foliation poles define a girdle pattern with a zone axis (52°/11°) rather close to the best line of the lineations (44°/21°). These fabrics correlate with the structures of the country rocks ascribed by several workers to a regional transpression. Toward the margins of the pluton, particularly the northern one, the lineations tend to rotate from NE to N in azimuth. This change is interpreted as due to strain partitioning, simple shearing with NE-SW extension being relayed by compression toward the northern pluton border. This new magnetic fabric study suggests that the Ngaoundéré pluton (poorly dated at c. 575 Ma) was emplaced during the late stages of the CCSZ dextral transpressive movement. It also provides some more constraints on the correlation

  17. Rare earths, thorium, and other minor elements in sphene from some plutonic rocks in West-Central Alaska

    International Nuclear Information System (INIS)

    Staatz, M.H.; Conklin, N.M.; Brownfield, I.K.

    1977-01-01

    Sphene is an abundant accessory mineral in some abnormally radioactive plutonic rocks in west-central Alaska. Seven samples of sphene from four different areas in west-central Alaska contained from 20,350 to 39,180 parts per million total rare earths and 390 to 2000 ppM thorium. The lanthanide content in six of the seven sphenes is chiefly the light rare earths and is similar to that of crystal abundance; a seventh sphene from the Darby Mountains, however, contains above average amounts of the heavy rare earths. A comparison of the lanthanide distribution in sphene from several areas indicates that the structure of sphene will accommodate whatever lanthanides are available when the mineral crystallizes. The amount of thorium and rare earths in sphene is also affected by the presence of other accessory minerals. Sphene in rocks containing either allanite or zircon has a lower thorium content than in rocks that do not contain allanite or zircon. Sphene, because of its abundance, may contain the greater part of the rare earths and thorium in some of the plutonic rocks of west-central Alaska

  18. Paleozoic subduction complex and Paleozoic-Mesozoic island-arc volcano-plutonic assemblages in the northern Sierra terrane

    Science.gov (United States)

    Hanson, Richard E.; Girty, Gary H.; Harwood, David S.; Schweickert, Richard A.

    2000-01-01

    This field trip provides an overview of the stratigraphic and structural evolution of the northern Sierra terrane, which forms a significant part of the wall rocks on the western side of the later Mesozoic Sierra Nevada batholith in California. The terrane consists of a pre-Late Devonian subduction complex (Shoo Fly Complex) overlain by submarine arc-related deposits that record the evolution of three separate island-arc systems in the Late Sevonian-Early Mississippian, Permian, and Late Triassic-Jurassic. The two Paleozoic are packages and the underlying Shoo Fly Complex have an important bearing on plate-tectonic processes affecting the convergent margin outboard of the Paleozoic Cordilleran miogeocline, although their original paleogeographic relations to North America are controversial. The third arc package represents an overlap assemblage that ties the terrane to North America by the Late Triassic and helps constrain the nature and timing of Mesozoic orogenesis. Several of the field-trip stops examine the record of pre-Late Devonian subduction contained in the Shoo Fly Complex, as well as the paleovolcanology of the overlying Devonian to Jurassic arc rocks. Excellent glaciated exposures provide the opportunity to study a cross section through a tilted Devonian volcano-plutonic association. Additional stops focus on plutonic rocks emplaced during the Middle Jurassic arc magmatism in the terrane, and during the main pulse of Cretaceous magmatism in the Sierra Nevada batholith to the east.

  19. Intrusion of basaltic magma into a crystallizing granitic magma chamber: The Cordillera del Paine pluton in southern Chile

    Science.gov (United States)

    Michael, Peter J.

    1991-10-01

    The Cordillera del Paine pluton in the southernmost Andes of Chile represents a deeply dissected magma chamber where mafic magma intruded into crystallizing granitic magma. Throughout much of the 10x15 km pluton, there is a sharp and continuous boundary at a remarkably constant elevation of 1,100 m that separates granitic rocks (Cordillera del Paine or CP granite: 69 77% SiO2) which make up the upper levels of the pluton from mafic and comingled rocks (Paine Mafic Complex or PMC: 45 60% SiO2) which dominate the lower exposures of the pluton. Chilled, crenulate, disrupted contacts of mafic rock against granite demonstrate that partly crystallized granite was intruded by mafic magma which solidified prior to complete crystallization of the granitic magma. The boundary at 1,100 m was a large and stable density contrast between the denser, hotter mafic magma and cooler granitic magma. The granitic magma was more solidified near the margins of the chamber when mafic intrusion occurred, and the PMC is less disrupted by granites there. Near the pluton margins, the PMC grades upward irregularly from cumulate gabbros to monzodiorites. Mafic magma differentiated largely by fractional crystallization as indicated by the presence of cumulate rocks and by the low levels of compatible elements in most PMC rocks. The compositional gap between the PMC and CP granite indicates that mixing (blending) of granitic magma into the mafic magma was less important, although it is apparent from mineral assemblages in mafic rocks. Granitic magma may have incorporated small amounts of mafic liquid that had evolved to >60% SiO2 by crystallization. Mixing was inhibited by the extent of crystallization of the granite, and by the thermal contrast and the stable density contrast between the magmas. PMC gabbros display disequilibrium mineral assemblages including early formed zoned olivine (with orthopyroxene coronas), clinopyroxene, calcic plagioclase and paragasite and later-formed amphibole

  20. Volumen y asimetría en los principales mercados accionarios latinoamericanos

    Directory of Open Access Journals (Sweden)

    Werner Kristjanpoller

    2012-01-01

    Full Text Available El presente estudio se enfoca en determinar la relación entre los volúmenes de operación y la asimetría de los rendimientos de los principales mercados accionarios latinoamericanos: Argentina, Brasil, Chile, Colombia, México y Perú. Se utiliza el modelo propuesto por Hutson et al. (2008, el cual incluye especificaciones de los primeros tres momentos de los volúmenes de operación comercializados y de los rendimientos de los mercados. La principal conclusión del estudio es el hallazgo de evidencia estadísticamente significativa de la influencia de los volúmenes de transacción y la asimetría de los rendimientos en los mercados accionarios de México, Brasil, Chile, Colombia y Argentina y en menor cuantía en Perú.

  1. Efeito da orientação para o mercado sobre a lucratividade da empresa

    OpenAIRE

    Narver,John C.; Slater,Stanley F.

    2006-01-01

    Acadêmicos e profissionais de marketing vêm observando, há mais de três décadas, que o desempenho empresarial é afetado pela orientação para o mercado, mas até hoje não há uma medida válida da orientação para o mercado nem análise sistemática de seu efeito sobre o desempenho das empresas. Os autores relatam o desenvolvimento de uma medida válida de orientação para o mercado e analisam seu efeito sobre a lucratividade de uma empresa. Usando uma amostra de 140 unidades de negócio composta de em...

  2. Risco de crédito ao consumidor: uma realidade do mercado brasileiro

    OpenAIRE

    Dayan, Carlos Moche

    2010-01-01

    Esta dissertação procura, em duas partes, retratar de forma crítica o mercado de crédito ao consumidor e pessoal no Brasil. Primeiramente, é descrita a forma operacional do sistema , através de dados e descrições práticas do mercado na atualidade. Uma especial atenção é dada à inadimplência, cuja estimativa é vital para a operação no mercado de crédito de varejo. Em uma segunda concessão de crédito parte, aspectos são abordados, com o respaldo de conceitos internacionais sobre o a...

  3. MERCADO, OPINIÓN PÚBLICA Y SOCIOLOGÍA EN ARGENTINA

    Directory of Open Access Journals (Sweden)

    Juan Pedro Blois

    2014-01-01

    Full Text Available Aquí se analizan las relaciones entre investigación de mercado, opinión pública y sociología en Argentina. Se exami - nan diversas dimensiones del trabajo de los sociólogos dedicados a la consultoría de mercado y opinión: ingreso en la actividad, diferencias entre investigación de mercado y estudios de opinión pública, relaciones con clientes y emplea - dores, vinculaciones con instituciones y pares académicos. Se afirma que la sociología académica y la aplicada a la consultoría tienden a configurarse según cánones divergentes, lo cual limita los intercambios entre uno y otro mundo.

  4. Mercado preditivo: um método de previsão baseado no conhecimento coletivo

    OpenAIRE

    Ivan Roberto Ferraz

    2015-01-01

    Mercado Preditivo (MP) é uma ferramenta que utiliza o mecanismo de preço de mercado para agregar informações dispersas em um grande grupo de pessoas, visando à geração de previsões sobre assuntos de interesse. Trata-se de um método de baixo custo, capaz de gerar previsões de forma contínua e que não exige amostras probabilísticas. Há diversas aplicações para esses mercados, sendo que uma das principais é o prognóstico de resultados eleitorais. Este estudo analisou evidências empíricas da efic...

  5. El estado del arte de la orientación al mercado en las organizaciones culturales

    Directory of Open Access Journals (Sweden)

    José Ignacio Azuela Flores

    2014-01-01

    Full Text Available Desde hace tiempo se han desarrollado diversas investigacio - nes centradas en determinar la contribución de la orientación al mercado en los resultados empresariales. Sin embargo, el estudio del efecto de la orientación al mercado en el desem - peño de las organizaciones culturales representa un área de investigación incipiente. Atendiendo a esta situación, nuestro trabajo tiene como principal objetivo realizar una revisión de los aspectos esenciales de la orientación al mercado en las or - ganizaciones no lucrativas, específicamente en organizaciones culturales; asimismo, identificar futuras líneas de investigación que permitirán contribuir en este campo de estudio aún fértil.

  6. Estrategia de cobertura con productos derivados para el mercado energético colombiano

    Directory of Open Access Journals (Sweden)

    Jhon Alexis Díaz Contreras

    2014-01-01

    Full Text Available El desarrollo que ha presentado el mercado mayorista de energía en Colombia ha permitido que hoy en día se estén negociando futuros de electricidad en el mercado de capitales local. Este trabajo tiene como objetivo diseñar un producto derivado en el que subyace el precio de la electricidad. Para esto, se analiza la serie de tiempo del precio de la electricidad para modelar su volatilidad; y a partir de esta, se diseña una opción exótica tipo barrera que muestra cómo se pueden usar este tipo de productos financieros en la cobertura de riesgos de los agentes del mercado.

  7. Estrategia de cobertura con productos derivados para el mercado energético colombiano

    Directory of Open Access Journals (Sweden)

    Jhon Alexis Díaz Contreras

    2014-01-01

    Full Text Available El desarrollo que ha presentado el mercado mayorista de energía en Colombia ha permitido que hoy en día se estén negociando futuros de electricidad en el mercado de capitales local. Este trabajo tiene como objetivo dise ̃ nar un producto derivado en el que subyace el precio de la electricidad. Para esto, se analiza la serie de tiempo del precio de la electricidad para modelar su volatilidad ; y a partir de esta, se dise ̃ na una opción exótica tipo barrera que muestra cómo se pueden usar este tipo de productos financieros en la cobertura de riesgos de los agentes del mercado.

  8. A GEOGRAFIA DO MERCADO MUNDIAL DE PRODUTOS AGROALIMENTARES E O PAPEL DO BRASIL

    OpenAIRE

    Medeiros, Marlon Clovis

    2014-01-01

    O artigo analisa as mudanças recentes na geografia do mercado mundial de produtos agrícolas, discutindo a inserção do Brasil, o papel dos mercados futuros na elevação dos preços internacionais e as mudanças entre os países exportadores e importadores de produtos agrícolas. Argumentamos que a principal mudança no espaço agrícola mundial nas últimas duas décadas foi o crescimento dos investimentos financeiros em commodities agrícolas e o crescimento dos mercados de futuros. A dinâmica financeir...

  9. Cruzeiros marítimos: realidade da oferta e da demanda no mercado brasileiro

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo de Almeida Ramoa

    2014-12-01

    Full Text Available O turismo marítimo apresenta uma demanda crescente e constante nos Estados Unidos e na Europa. No Brasil, esse mercado vinha se destacando com crescimento exponencial da demanda, no entanto, a partir da temporada 2011/2012 a taxa de crescimento tem apresentado queda. Este estudo de caráter exploratório e descritivo utiliza o método de procedimento matemático e tem como objetivo geral identificar a realidade da oferta e da demanda no mercado brasileiro de cruzeiros marítimos. Para atingi-lo foram identificados os históricos da oferta e da demanda, no período de 2004 a 2013, e da situação atual da infraestrutura portuária, através da utilização de técnicas de documentação indireta, procedimento documental e bibliográfico. Para se comparar a taxa de crescimento do mercado brasileiro com os principais mercados foi realizado cálculo da extrapolação matemática exponencial. Os resultados apresentados indicam que o Brasil é o único país entre os dez maiores mercados de cruzeiros marítimos, que possui taxa de crescimento negativo, indicando haver uma crise no segmento de cruzeiros marítimos, cujo motivo aponta para os problemas estruturais como sendo uma das causas da queda da oferta e da demanda no mercado brasileiro.

  10. Mercado laboral y capital social en un contexto de alta movilidad de fuerza de trabajo.

    OpenAIRE

    Romo Genoy, Edgardo

    2015-01-01

    Esta investigación tiene como objetivo principal dar cuenta del mercado laboral y el nivel de capital social en un contexto de alta movilidad de fuerza de trabajo. Para este propósito se toma el caso de estudio en el corregimiento de Chiles, municipio de Cumbal (Colombia) ubicado en la frontera colombo ecuatoriana. En primer lugar se aborda el tema de investigación definiendo el mercado desde la perspectiva de Karl Polanyi, según la cual “el mercado” no se explica únicamente en acontecimiento...

  11. PROGRESO TÉCNICO Y PODER DE MERCADO EN LA INDUSTRIA FARMACÉUTICA

    Directory of Open Access Journals (Sweden)

    JOSÉ GALLEGO

    2009-01-01

    Full Text Available En este artículo se presenta la estimación del poder de mercado en la industria farmacéutica colombiana durante 1982 - 2004. El resultado se compara con las estimaciones realizadas para los Estados Unidos y Finlandia. La conclusión fundamental es la confirmación de la existencia de poder de mercado, al estimarse un índice de Lerner mayor que cero y un markup de Hall mayor que uno; la estimación es equivalente al 0.92 y 0.95 del poder presente en Estados Unidos y Finlandia, respectivamente.

  12. PROGRESO TÉCNICO Y PODER DE MERCADO EN LA INDUSTRIA FARMACÉUTICA

    OpenAIRE

    GALLEGO, JOSÉ

    2009-01-01

    En este artículo se presenta la estimación del poder de mercado en la industria farmacéutica colombiana durante 1982 - 2004. El resultado se compara con las estimaciones realizadas para los Estados Unidos y Finlandia. La conclusión fundamental es la confirmación de la existencia de poder de mercado, al estimarse un índice de Lerner mayor que cero y un markup de Hall mayor que uno; la estimación es equivalente al 0.92 y 0.95 del poder presente en Estados Unidos y Finlandia, respectivamente. ...

  13. Progreso técnico y poder de mercado en la industria farmacéutica

    OpenAIRE

    GALLEGO, JOSÉ

    2010-01-01

    En este artículo se presenta la estimación del poder de mercado en la industria farmacéutica colombiana durante 1982 - 2004. El resultado se compara con las estimaciones realizadas para los Estados Unidos y Finlandia. La conclusión fundamental es la confirmación de la existencia de poder de mercado, al estimarse un índice de Lerner mayor que cero y un markup de Hall mayor que uno; la estimación es equivalente al 0.92 y 0.95 del poder presente en Estados Unidos y Finlandia, respectivamente....

  14. Segmentación del mercado laboral venezolano desde una perspectiva de género

    OpenAIRE

    Muñoz de C., Samaria V.; Pinilla, Bernarda

    2014-01-01

    Este trabajo analiza la segmentación del mercado laboral venezolano a través de la metodología del Análisis de Correspondencia Múltiple para el año 2009. Los resultados muestran que el género y la educación universitaria son elementos segmentadores del mercado laboral en cuanto a: grupo de ocupación, rama de actividad, sector de ocupación, tamaño de la empresa y el nivel de ingreso. Se muestra que en Venezuela el invertir en capital humano incrementa las posibilidades de accede...

  15. Caracterización del mercado laboral del sector hotelero del estado Mérida, Venezuela

    OpenAIRE

    Villasmil R., María A.; Andrade, Henry

    2009-01-01

    Esta investigación trata sobre modelos que permiten caracterizar Mercados Laborales Locales (MLL), ya que en Venezuela el manejo de los mismos es casi inexistente. En este sentido, se plantea como objetivo caracterizar al mercado laboral del sector hotelero del estado Mérida-Venezuela en función del conocimiento de las particularidades económicas, institucionales, políticas, sociales, educativas y culturales de la zona así como las condiciones que se tengan en materia de empleo, oferta de for...

  16. Cristalan 836: lanzamiento de un producto innovador en un mercado comoditizado

    OpenAIRE

    Galarza Uchuya, Patricia Fabiola; Gallardo Ramírez, Javier Luis

    2016-01-01

    La tesis trata el caso de la decisión de la empresa Orica Chemicals de introducir en el mercado peruano la resina de poliéster Cristalan 836, un producto innovador que le da características de desempeño superiores a los productos existentes en el mercado, a un costo competitivo y ya lista para usar. Modasa, la empresa carrocera más grande de Perú, se interesa por el producto y hace un pedido. Una vez recibido el producto, la empresa presenta problemas porque los usuarios no están conformes y ...

  17. Ginga com tapioca: gastronomia do mercado da Redinha como atrativo turístico

    Directory of Open Access Journals (Sweden)

    Charllys de Oliveira Lima

    2016-06-01

    Full Text Available O presente estudo tem como objetivo analisar o Mercado da Redinha enquanto potencial turístico gastronômico, através da comercialização da ginga com tapioca, um prato típico da cidade de Natal. Apesar de também ser comercializado por vendedores ambulantes nas principais praias do litoral natalense, o Mercado Público da Redinha é o ponto original onde se comercializa esse prato. Muitos turistas que visitam a capital potiguar desejam conhecer a gastronomia típica, mas o mercado atrai especialmente turistas locais e moradores como opção de entretenimento. Realizou-se um estudo de natureza quantitativa descritiva, cujos dados foram obtidos através de formulário composto por 15 questões respondidas por 31 usuários do Mercado. Para análise, as questões foram organizadas em categorias que abrangeram o perfil dos usuários e suas opiniões em relação à infraestrutura do mercado, à frequência de visitação, meio de divulgação que os levou a conhecer o Mercado, percepção sobre qualidade de acesso e demandas de melhorias. Em relação à gastronomia, indagou-se sobre o cardápio servido, o gosto e apresentação do prato, o valor cobrado e a opinião sobre a qualidade do atendimento. Os resultados evidenciaram pontos negativos como a falta de saneamento adequado e regular que também comprometia a higiene; bem como a falta de infraestrutura como principal reclamação entre os entrevistados. Em relação aos pontos positivos foram incluídos: preço justo, bom atendimento e gosto agradável do prato. A maioria dos entrevistados indicaria o mercado a outros e, apesar dos diversos problemas apontados, os usuários, especialmente, do sexo masculino, são atraídos em busca da ginga com tapioca para beber com amigos na semana. A revisão da dinâmica interna do Mercado pode fomentar como estratégia para incluí-lo no roteiro do turismo gastronômico regional.

  18. ¿Cómo hacer del mercado de capitales, una alternativa para las Pymes en Colombia?

    OpenAIRE

    Suescún Sanabria, Joan Manuel

    2014-01-01

    El mercado de capitales en Colombia se caracteriza por ser uno de los más dinámicos de la región de sur América, generando integración entre los sectores deficitarios y superavitarios de recursos monetarios no solo de Colombia sino de Perú y Chile a través de su programa MILA, no obstante se puede definir como un mercado excluyente con definidas capas del sector empresarial nacional, situación particular para las empresas Pymes del país, por lo cual el Estado ha tratado de ofrecer diferentes ...

  19. Riesgos sistémicos en el mercado interbancario en Venezuela, 2004-2014

    OpenAIRE

    Pagliacci, Carolina; Peña, Jennifer

    2017-01-01

    Este trabajo muestra la aplicación del modelo núcleo-periferia para medir dos dimensiones del riesgo sistémico en el mercado interbancario venezolano: conectividad y patrones de fondeo entre bancos. El período de estudio es de interés porque contiene un episodio de ajuste financiero en el año 2009. Los resultados muestran que posterior a esta fecha, la conectividad del mercado parece haberse reducido, lo que podría redundar en menor riesgo sistémico de contagio. En contraposición, los patrone...

  20. Sistema de producción flexible de productos manufacturados para un mercado globalizado

    OpenAIRE

    Acuña Pinaud, Leoncio Luis; Acuña Pinaud, Leoncio Luis

    2008-01-01

    El presente trabajo de investigación tiene por objetivo el diseño de un Sistema de Producción Flexible de productos manufacturados paraun mercado globalizado a partir del enfoque de sistemas según las características identificadas de las experiencias obtenidas de las empresas. Las alternativas tecnológicas que se presentan para los productos de manufactura metalmecánica contribuye a la exigencia de los certificados de calidad que el mercado global demanda. A partir del trabajo de campo realiz...

  1. Estudio de Mercado de la Microencapsulación de Fluidos

    OpenAIRE

    de Batlle Mercadé, Juan Batlle

    2016-01-01

    El TFG desarrollado a continuación trata sobre un estudio de mercado de la microencapsulación de fluidos llevado a cabo por petición de una empresa especializada en este producto. Los objetivos de este proyecto son: en primer lugar, dimensionar el mercado de las micropartículas para las zonas geográficas de Europa (EU) y Estados Unidos (EEUU) en cuatro sectores (Pharma, Functional Food, Personal Care y Home Care); en segundo lugar, identificar la demanda no cubierta mediante las necesidades d...

  2. Competencia de las prendas de vestir mexicanas en el mercado de Estados Unidos

    OpenAIRE

    Nadima Simón Domínguez

    2004-01-01

    El objetivo de este artículo es analizar el comportamiento de las exportaciones del sector de prendas de vestir (de tejido de punto y de tejido plano) en el mercado de Estados Unidos (EUA) durante el periodo de 1990 a 2002. Se identifican los principales competidores, las características de ambos mercados y los instrumentos de política comercial utilizados por las empresas estadounidenses para la protección de su industria textil. De igual forma, se hace un análisis de los princip...

  3. Empresa bajo incertidumbre en el precio: modelo con dos destinos y un mercado de futuros

    Directory of Open Access Journals (Sweden)

    Álvarez López, Alberto A.

    2008-01-01

    Full Text Available En este trabajo se desarrolla un modelo para una empresa competitiva que produce una cantidad determinada de un bien, la cual debe repartir entre dos fines distintos, para los que se tienen diferentes precios. La empresa debe decidir la cantidad que destinará a cada fin antes de conocer el precio para uno de ellos; para este fin, existe además un mercado de futuros, por lo que también debe decidir la cantidad que venderá en ese mercado. Tras presentar el modelo, se interpretan económicamente las diferentes soluciones del problema, y se estudian algunas de sus propiedades.

  4. Redes alimentarias alternativas en grandes ciudades: los mercados de productores agrarios en Madrid

    OpenAIRE

    Ricardo Méndez Gutiérrez del Valle; Obdulia Monteserín Abella

    2017-01-01

    Las redes alimentarias alternativas constituyen una temática de investigación emergente en los estudios urbanos, que cuestiona los modelos dominantes de producción, distribución y consumo de alimentos. Una de sus manifestaciones son los mercados de productores, que ponen en contacto directo a productores periurbanos y rurales con consumidores urbanos, favoreciendo las relaciones de proximidad y los circuitos cortos. El artículo investiga los mercados de productores en Madrid mediante una estr...

  5. Custo de capital e globalização dos mercados

    OpenAIRE

    Oliveira, Reinaldo Grasson de

    2010-01-01

    O trabalho aborda a questão do custo de capital em um contexto de mercados globalizados. Analisa as principais metodologias para definição das variáveis que compõem o Custo Médio Ponderado de Capital (Weighted Average Cost of Capital) e o impacto exercido pela segmentação/integração dos mercados financeiros mundiais nesta definição. Discute as relações internacionais de paridade (Purchasing Power Parity, Efeito Fisher, lnterest Rate Parity, entre outras) e suas implicações p...

  6. El sector de manufacturas en Guanajuato y su participación en el mercado nacional

    OpenAIRE

    Roberto Escalante; Horacio Catalán

    2011-01-01

    El objetivo del presente artículo es identificar los determinantes de la producción de la industria de manufacturas en Guanajuato en tres divisiones: alimentos, autopartes y calzado. Los resultados de las estimaciones econométricas muestran que la industria de autopartes es bastante sensible a las condiciones del mercado externo. La industria de alimentos está muy vinculada al mercado interno. La industria del calzado desde principios de la presente década ha enfrentado una crisis derivada de...

  7. El Outsourcing en la dinámica de sistemas hacia mercados extranjeros

    OpenAIRE

    Beltrán Segura, Jaime Andrés; Romick Rodríguez, John David; Velásquez Sarasty, Oscar Andrés

    2014-01-01

    Este trabajo recopila literatura académica relevante sobre estrategias de entrada y metodologías para la toma de decisión sobre la contratación de servicios de Outsourcing para el caso de empresas que planean expandirse hacia mercados extranjeros. La manera en que una empresa planifica su entrada a un mercado extranjero, y realiza la consideración y evaluación de información relevante y el diseño de la estrategia, determina el éxito o no de la misma. De otro lado, las metodologías considerada...

  8. Estudo de mercado: "A satisfação dos franchisados em Portugal"

    OpenAIRE

    Fialho, Maria Cristina Grilo

    2013-01-01

    Este relatório de estágio foi realizado no âmbito do Mestrado em Matemática e Aplicações, com especialização em Estatística e Investigação Operacional, da Universidade de Aveiro, e o estágio foi realizado no GEMEO (Gabinete de Estudos de Mercado e Opinião do IPAM). Foram desenvolvidas várias atividades relacionadas com os Estudos de Mercado, e uma dessas atividades é sobre o Franchising, onde se pretende avaliar o perfil e satisfação do Franchisado em Portugal. Para isso, fo...

  9. La estrategia competitiva que adopta la empresa transnacional en el mercado global

    OpenAIRE

    Adalberto Cabello Chávez; Rafael Reyes; Pedro Solís Pérez

    2006-01-01

    La aldea global es un mundo sin fronteras, sin límites, sin residencia, donde circulan libremente individuos, mercancías y capital. Las instituciones de la aldea global están conformadas por el estado regional, la empresa transnacional y el mercado global, de las cuales la que se acopla y domina a la aldea es la empresa transnacional, que utiliza diversas estrategias competitivas para controlar el mercado global a través de la organización multinacional con gestión centralizada...

  10. Geochemistry of biotite granites from the Lamas de Olo Pluton, northern Portugal

    Science.gov (United States)

    Fernandes, Susana; Gomes, Maria; Teixeira, Rui; Corfu, Fernando

    2013-04-01

    In the Central Iberian Zone (CIZ) extensive crustal recycling occurred during the post-thickening extension stage of the Variscan orogeny (~330-290 Ma). After the ductile deformation phase D3 (~320-300 Ma), characterized by the intrusion of large volumes of highly peraluminous granitic magmas, rapid and drastic tectonic changes at about 300 Ma gave rise to the brittle phase of deformation D4 that controlled the emplacement of Fe-K subalkaline granites (296-290 Ma; Dias et al. 1998). The Lamas de Olo Pluton (LOP) is controlled by NE-SW and NW-SE fracture systems, probably related to the Régua-Verin fault zone (Pereira, 1989). The LOP is a medium to coarse-grained, porphyritic biotite granite, accompanied by medium- to fine grained, porphyritic biotite granite (Alto dos Cabeços- AC) and a more leucocratic, fine-grained, slightly porphyritic biotite-muscovite granite (Barragens- BA). The contacts between LO and AC are generally diffuse, whereas those to BA are sharp. In fact, the BA granite can occur in dykes and sills cutting LO and AC. Microgranular enclaves and xenoliths are very rare. The LOP intrudes the Douro Group, presumably of Precambrian to Cambrian age, and two-mica granites from the Vila Real composite massif. The LOP granites consist of quartz, microcline, plagioclase, biotite, zircon, titanite, tourmaline apatite, fluorite, ilmenite, magnetite, and rutile, with muscovite in BA granite and rare allanite in the LO and AC granites. The plagioclase composition is of oligoclase (An12) - andesine (An35) for LO granite, albite (An9) - andesine (An30) for CA granite and albite (An5) - oligoclase (An20) for BA granite. There are decreases in: a) anorthite content from phenocryst to matrix plagioclase; b) Ba content from phenocryst to matrix microcline in all granites. The Fe2+ biotite has a composition similar to that of biotite from calc-alkaline to sub-alkaline rock series. The LO and AC granites are meta- to peraluminous with ASI variable between 1.05 and 1

  11. Perspectivas del Mercado de Derivados en Colombia Retraso derivado del desconocimiento Perspectivas del Mercado de Derivados en Colombia Retraso derivado del desconocimiento

    Directory of Open Access Journals (Sweden)

    Natalia Cañas Arboleda

    2006-12-01

    Full Text Available El mercado de derivados representa la evolución de los mercados financieros enel mundo, debido a la capacidad que tiene el primero de ofrecer cobertura a losparticipantes del mercado, función importante en el actual contexto de globalización.Por lo anterior, en el país se desarrollan, aunque un poco tarde, diversos proyectospara la incorporación de futuros y opciones, como nuevas alternativas de inversióny financiación que redunden en menor incertidumbre para los inversionistas dediferentes sectores de la economía. A partir de allí, se muestra la situación actualdel mercado de derivados en Colombia y los esfuerzos realizados por diferentesinstituciones, encaminados al desarrollo del mismo.The derivative market represents the evolution of financial markets in the world, given the capacity that the former has for offering coverage to market participants, which is an important feature in the present context of globalization. For this reason, some projects are being developed in our country, though  a bit late, for the incorporation of futures and options, as new investment and financing alternatives, which may result in a reduced uncertainty for the investors in different sectors of the economy. This article shows the current situation of the derivative market in Colombia and the efforts made by different institutions, aimed at the development of such a market.

  12. Rupturas na rede urbana e faces do mercado de trabalho

    Directory of Open Access Journals (Sweden)

    Denise Elias

    2012-07-01

    Full Text Available A mundialização do capital é um grande propulsor de divisão do trabalho. Ao potencializar as condições gerais de produção nas diversas escalas, agrega inúmeros novos espaços para a circulação e produção de bens. Isso repercute territorialmente numa desconcentração da produção, reafirmando cada vez mais a necessidade da divisão técnica e territorial do trabalho, bem como de uma nova maneira de organizá-lo, tendo em vista o fomento da produtividade. A reestruturação dos processos produtivos desencadeia mudanças diversas tanto na reprodução social como na organização do espaço geográfico. No Brasil, especialmente desde a década de 1980, muitos lugares tornam-se atrativos à produção moderna e são incorporados aos circuitos produtivos globalizados de empresas nacionais e multinacionais de diferentes ramos da economia. Entre os resultados, teríamos reestruturações econômicas e territoriais de várias naturezas e magnitudes, imprimindo novas características à rede urbana. No presente artigo temos como objetivo apresentar, a luz da conjuntura atual, alguns dos rebatimentos de tais processos materializados numa cidade de porte médio e respectiva região localizada no semiárido brasileiro. O destaque será dado à conformação da divisão técnica e territorial do trabalho, a partir de dados do mercado de trabalho formal. Abstract RUPTURES AT THE URBAN NETWORK AND FACES OF THE LABOR MARKET The Globalization of the capital is one of the greatest agents propelling the work division. By augmenting the general conditions of production in the diverse scales, it aggregates several new spaces to the circulation and production of goods. This reverberates territorially in the de-concentration of production, reaffirming more and more the need of a technical and territorial of work, as well as a new way of work organization, having in mind the encouragement of productivity. The restructuring of the productive processes

  13. Composite Sunrise Butte pluton: Insights into Jurassic–Cretaceous collisional tectonics and magmatism in the Blue Mountains Province, northeastern Oregon

    Science.gov (United States)

    Johnson, Kenneth H.; Schwartz, J.J.; Žák, Jiří; Verner, Krystof; Barnes, Calvin G.; Walton, Clay; Wooden, Joseph L.; Wright, James E.; Kistler, Ronald W.

    2015-01-01

    The composite Sunrise Butte pluton, in the central part of the Blue Mountains Province, northeastern Oregon, preserves a record of subduction-related magmatism, arc-arc collision, crustal thickening, and deep-crustal anatexis. The earliest phase of the pluton (Desolation Creek unit) was generated in a subduction zone environment, as the oceanic lithosphere between the Wallowa and Olds Ferry island arcs was consumed. Zircons from this unit yielded a 206Pb/238U age of 160.2 ± 2.1 Ma. A magmatic lull ensued during arc-arc collision, after which partial melting at the base of the thickened Wallowa arc crust produced siliceous magma that was emplaced into metasedimentary rocks and serpentinite of the overthrust forearc complex. This magma crystallized to form the bulk of the Sunrise Butte composite pluton (the Sunrise Butte unit; 145.8 ± 2.2 Ma). The heat necessary for crustal anatexis was supplied by coeval mantle-derived magma (the Onion Gulch unit; 147.9 ± 1.8 Ma).The lull in magmatic activity between 160 and 148 Ma encompasses the timing of arc-arc collision (159–154 Ma), and it is similar to those lulls observed in adjacent areas of the Blue Mountains Province related to the same shortening event. Previous researchers have proposed a tectonic link between the Blue Mountains Province and the Klamath Mountains and northern Sierra Nevada Provinces farther to the south; however, timing of Late Jurassic deformation in the Blue Mountains Province predates the timing of the so-called Nevadan orogeny in the Klamath Mountains. In both the Blue Mountains Province and Klamath Mountains, the onset of deep-crustal partial melting initiated at ca. 148 Ma, suggesting a possible geodynamic link. One possibility is that the Late Jurassic shortening event recorded in the Blue Mountains Province may be a northerly extension of the Nevadan orogeny. Differences in the timing of these events in the Blue Mountains Province and the Klamath–Sierra Nevada Provinces suggest that

  14. Recognition of favorable zones for uranium and thorium accumulation, at Um Ara-Um Shilman granitic pluton, south eastern desert, Egypt, using airborne spectrometric and magnetic data

    International Nuclear Information System (INIS)

    Elkattan, E.M.

    1995-01-01

    The objective is aimed at identifying significant U and Th anomalies, the amount of re-mobilization of U and Th, the structural framework of the granite pluton and the distribution of spectrometric anomalies. The study revealed that the granite pluton could be represented as a single radio-lithologic unit excluding abnormal measurements exceeding Xban + 2S. It also revealed the existence of eight strong spectrometric anomalies. Observed values of eU correlate well with eTh, r=0.72 while the correlation between eU/eTh and eU is lacking, r=0.190. Meanwhile, there is a negative correlation between eU/eTh and eTh,r= -0.335. This deficiency in correlation suggests a limited or zero remobilization of uranium, which was partly governed by magmatic processes. Most of the radioactive anomalies were found within or near the major contact faults which may act as channels for mineralized fluids from the subsurface. These fluids possess increased concentrations of U and/or Th which could exist in appropriate chemical and/or structural traps. The U and Th anomalies were found to be associated with the northern and southern parts of the granite pluton respectively. The difference between the northern and southern parts of the granite pluton may be attributed to differences in radioelement content, the effect of partial and/or complete digestion of older rocks, or to different levels of erosion. (author)

  15. AN EARLY PERMIAN GARNET-BEATING PERALUMINOUS GRANITIC PLUTON IN THE SOUTH TIANSHAN OROGENIC BELT, NW CHINA: PETROLOGICAL, MINERALOGICAL AND GEOCHEMICAL CONSTRAINTS

    Directory of Open Access Journals (Sweden)

    Qie Qin

    2017-01-01

    Full Text Available The Ku’erchu granitic pluton (283±4 Ma was exposed in the eastern part of the South Tianshan Orogenic Belt. The granites from the intrusion are mainly composed of orthoclase (~45 vol. %, plagioclase (~15 vol. %, quartz (~20 vol. %, muscovite (~10 vol. % and biotite (~5 vol. %, with accessory minerals including garnet, zircon and Fe-Ti oxide.

  16. Three-dimensional cooling pattern of a granitic pluton 2. The study of deuteric sub-solidus reactions in the Toki granite, Central Japan

    International Nuclear Information System (INIS)

    Yuguchi, Takashi; Tsuruta, Tadahiko; Nishiyama, Tadao

    2011-01-01

    Petrographical studies examining the development and variations of sub-solidus reactions recorded in the Toki granite represent the three-dimensional cooling pattern of this zoned pluton in Central Japan. Samples collected from 19 boreholes in the Toki granite show characteristics indicative of spatial variations in the extent of the sub-solidus reactions. Exsolution coarsening has produced microperthite, including albite-rich lamellae, in this pluton, while deuteric coarsening has resulted in the formation of patchperthite, myrmekite, and the reaction rim. The extent of the deuteric coarsening reactions can be evaluated from the width and spacing of the albite-rich patch in patchperthite and from the thickness of myrmekite and the reaction rim. The width, spacing, and thickness of these textural features increase systematically with elevation; they also increase gradually in the horizontal inward direction in the western part of the pluton but not in the eastern part of the pluton. The systematic variations in textural development indicate that the Toki granite cooled effectively from the roof and from the western margin during the deuteric coarsening stage. The deuteric coarsening may have occurred at temperatures below 500°C, as indicated by ternary feldspar thermometry. (author)

  17. Time-scales of assembly and thermal history of a composite felsic pluton: constraints from the Emerald Lake area, northern Canadian Cordillera, Yukon

    Science.gov (United States)

    Coulson, Ian M.; Villeneuve, Mike E.; Dipple, Gregory M.; Duncan, Robert A.; Russell, James K.; Mortensen, James K.

    2002-05-01

    Knowledge of the time-scales of emplacement and thermal history during assembly of composite felsic plutons in the shallow crust are critical to deciphering the processes of crustal growth and magma chamber development. Detailed petrological and chemical study of the mid-Cretaceous, composite Emerald Lake pluton, from the northern Canadian Cordillera, Yukon Territory, coupled with U-Pb and 40Ar/ 39Ar geochronology, indicates that this pluton was intruded as a series of magmatic pulses. Intrusion of these pulses produced a strong petrological zonation from augite syenite, hornblende quartz syenite and monzonite, to biotite granite. Our data further indicate that multiple phases were emplaced and cooled to below the mineral closure temperatures over a time-scale on the order of the resolution of the 40Ar/ 39Ar technique (˜1 Myr), and that emplacement occurred at 94.3 Ma. Simple thermal modelling and heat conduction calculations were used to further constrain the temporal relationships within the intrusion. These calculations are consistent with the geochronology and show that emplacement and cooling were complete in less than 100 kyr and probably 70±5 kyr. These results demonstrate that production, transport and emplacement of the different phases of the Emerald Lake pluton occurred essentially simultaneously, and that these processes must also have been closely related in time and space. By analogy, these results provide insights into the assembly and petrogenesis of other complex intrusions and ultimately lead to an understanding of the processes involved in crustal development.

  18. La Escalerilla pluton, San Luis Argentina: The orogenic and post-orogenic magmatic evolution of the famatinian cycle at Sierras de San Luis

    Science.gov (United States)

    Morosini, Augusto Francisco; Ortiz Suárez, Ariel Emilio; Otamendi, Juan Enrique; Pagano, Diego Sebastián; Ramos, Gabriel Alejandro

    2017-01-01

    Field relationships, geochemical analysis and two new absolute ages (LA-MC-ICP-MS U/Pb-zircon) allow the division of the La Escalerilla pluton (previously considered to be a single granitic body) into two different plutons: a new La Escalerilla pluton (s.s.), dated at 476.7 ± 9.6 Ma, that represents the northern portion, and the El Volcán pluton, dated at 404.5 ± 8.5 Ma, located in the southern sector. The La Escalerilla pluton is composed of three facies: (1) biotite-bearing granodiorite, (2) porphyritic biotite-bearing granite, and (3) porphyritic two micas-bearing leucogranite, being the presence of late-magmatic dykes in these facies common. The El Volcán pluton is composed of two main facies: 1) porphyritic biotite-bearing granite, and 2) two micas-bearing leucogranite, but amphibole-bearing monzodioritic and tonalititic mega-enclaves are also common, as well as some dykes of amphibole and clinopyroxene-bearing syenites. A peculiarity between the two plutons is that their most representative facies (porphyritic biotite-bearing granites) have, apart from different absolute ages, distinctive geochemical characteristics in their concentrations of trace elements; the La Escalerilla granite is comparatively poorer in Ba, Sr, Nb, La, Ce, P, and richer in Rb, Tb, Y, Tm and Yb. The El Volcán granite is notably enriched in Sr and depleted in Y, resulting in high Sr/Y ratios (12.67-39.08) compared to the La Escalerilla granite (1.11-2.41). These contrasts indicate that the separation from their sources occurred at different depths: below 25 km for the La Escalerilla, and above 30 km for the El Volcán. Moreover, the contrasts allow us to interpret a thin crust linked to an environment of pre-collisional subduction for the first case, and a thickened crust of post-collisional environment for the second, respectively.

  19. Geochronological, geochemical, and Sr-Nd-Hf isotopic characteristics of Cretaceous monzonitic plutons in western Zhejiang Province, Southeast China: New insights into the petrogenesis of intermediate rocks

    Science.gov (United States)

    Liu, Liang; Qiu, Jian-Sheng; Zhao, Jiao-Long; Yang, Ze-Li

    2014-05-01

    We present comprehensive petrological, geochemical, and Sr-Nd-Hf isotopic data for the Matou and Dalai plutons in western Zhejiang Province, Southeast China, with the aim of constraining the petrogenesis of monzonites and to offer new insights into the deep processes of interaction between crustal- and mantle-derived magmas beneath SE China. The Matou pluton comprises quartz monzonite, whereas the Dalai pluton consists of quartz monzodiorite. Zircon U-Pb ages obtained by laser ablation-inductively coupled plasma-mass spectrometry show that both plutons were emplaced at 99-101 Ma. Rocks of both plutons are intermediate to silicic, metaluminous to weakly peraluminous, subalkaline, and K-rich in composition. Samples of the plutons are enriched in large ion lithophile (e.g., Rb, K, and Pb) and light rare earth elements, depleted in high-field strength elements (e.g., Nb, Ta, and Ti), and have small negative or no Eu anomalies. In addition, the rocks have high Mg# values (up to 53.9), high zircon ɛHf(t) values (up to - 1.4), and low Nb/U and Ta/U ratios. Geochemical evidence suggests that both depleted asthenospheric and metasomatically enriched mantle components were involved in the formation of these monzonitic rocks. The presence of inherited zircons with Palaeoproterozoic ages and zircons with unusually low ɛHf(t) values (- 12.9) in the Matou quartz monzonites indicates that ancient crustal materials were also involved in their petrogenesis. In combination with the presence of abundant mafic microgranular enclaves (MMEs) with spheroidal to ellipsoidal-ovoidal shapes and xenocrysts within the more diffused enclaves, and the results of trace element modelling, we suggest that the Matou quartz monzonites were generated by mixing between mantle-derived mafic magmas and crustally derived silicic magmas. The Dalai pluton is relatively homogeneous and contains fewer MMEs than the Matou pluton. Zircons from the Dalai pluton show no inherited components, indicating that

  20. New petrographic, geochemical and geochronological data for the Reguengos de Monsaraz pluton (Ossa Morena Zone, SW Iberian Massif, Portugal)

    Energy Technology Data Exchange (ETDEWEB)

    Antunes, A.; Santos, J. F.; Azevedo, M. R.; Mendez, M. H.; Ribeiro, S.

    2010-07-01

    The Reguengos de Monsaraz pluton is a late to post-tectonic Variscan intrusion occurring in the Ossa Morena Zone (Iberian Variscan Chain). The dominant lithological types are tonalites and granodiorites, but the internal area of the massif is composed of gabbro-dioritic rocks. Field evidence shows that the intrusion is heterogeneous at mesoscopic scale suggesting that the emplacement of mafic and felsic magmas was contemporaneous. Petrographic and geochemical studies reveal that the different lithologic types define a continuous sequence with compositions varying from metaluminous to slightly peraluminous and a typical calc-alkaline signature. In Harker variation diagrams, it is possible to observe systematic rectilinear correlations pointing to the involvement of magma mingling/mixing processes in the petrogenesis of this sequence. Rb-Sr isotopic data, using a mineral-mineral pair from a granodiorite sample, yielded an age of 298 Ma, interpreted as a cooling age after igneous crystallization. (Author) 13 refs.

  1. Statistical analysis of the geological-hydrological conditions within part of the Eye-Dashwa pluton, Atikokan, northwestern Ontario

    International Nuclear Information System (INIS)

    Brown, P.A.; Rey, N.A.C.

    1989-01-01

    The occurrence and distribution of fracture-filling material within the Eye-Dashwa granite indicate that the dominant fracture system formed shortly after emplacement and cooling of the pluton at 2678 ± 67 Ma. Subsequent reactivation of these ancient fractures was accompanied by sequentially younger and lower temperature filling materials. These reopened ancient fractures are best developed in the upper 300-400 m of the rock mass and are commonly conduits for present-day groundwater flow. Multiple linear regression analysis performed on the geological variables identified a highly significant correlation between a number of these variable and hydraulic conductivity values measured in 25 m test sections of the boreholes. The predictive capability of the regression design was tested with seven new test data and found to be a valid estimator of the hydrogeological conditions

  2. Multistage magma emplacement and progressive strain accumulation in the shallow-level Krkonoše-Jizera plutonic complex, Bohemian Massif

    Science.gov (United States)

    Žák, Jiří; Verner, Kryštof; Sláma, Jiří; Kachlík, Václav; Chlupáčová, Marta

    2013-09-01

    relationships combined with new U-Pb zircon geochronology suggest that the shallow-level Krkonoše-Jizera plutonic complex, northern Bohemian Massif, was assembled successively from bottom to top, starting with emplacement of the separately evolved S-type Tanvald granite (317.3 ± 2.1 Ma), followed by at least two voluminous batches of the I-type porphyritic Liberec (319.5 ± 2.3 Ma) and Jizera (320.1 ± 3.0 Ma and 319.3 ± 3.7 Ma) granites. The intrusive sequence was completed by uppermost, minor intrusions of the equigranular Harrachov (315.0 ± 2.7 Ma) and Krkonoše granites. The I-type granites exhibit an unusually complex pattern of superposed feldspar phenocryst and magnetic fabrics as revealed from the anisotropy of magnetic susceptibility (AMS). The outer Liberec granite preserves margin-parallel foliations and lineations, interpreted to record emplacement-related strain captured by cooling from the pluton floor and walls. In contrast, the inner Jizera, Harrachov, and Krkonoše granites were overprinted by synmagmatic strain resulting from dextral movements along regional strike-slip faults cutting the opposite ends of the plutonic complex. Late-stage felsic dikes in the Liberec and Jizera granites reorient from horizontal to vertical (lineation-perpendicular) attitude in response to changing the least principal stress direction, whereas mafic schlieren do not do so, representing only randomly oriented small-scale thermal-mechanical instabilities in the phenocryst framework. In general, this case example challenges the common approach of inferring pluton-wide magma flow from interpolated foliation, lineation, and schlieren patterns. More likely, magmatic fabrics in large plutons record complex temporal succession of superposed strains resulting from diverse processes at multiple scales.

  3. “LAS AUDIENCIAS DE LA CALLE” ENTRE MERCADOS, CALLES Y MÚSICA EN PERÚ

    Directory of Open Access Journals (Sweden)

    Franklin Cornejo Urbina

    2008-01-01

    Full Text Available Cuando se habla de audiencias de los medios de comunicación entendemos también que ellas cambian en los contextos, donde los televidentes y radioescuchas usan los medios con modos y fines diferentes. Así y como parte de la diversidad de las audiencias he ubicado bajo la definición “audiencias de la calle” a un grupo social, más bien de origen humilde y de rutinas cotidianas colectivo-comunitarias, que incluyen a ex campesinos, niños de la calle, comerciantes ambulantes e inmigrantes empobrecidos que se reúnen, trabajan y pasan gran parte del día en mercados de zonas urbano marginales de Lima, en Perú. El mercado popular es un lugar para las grandes mayorías donde hay encuentros y tensiones entre lo urbano y rural por viejas diferencias étnicas, regionales, locales y comunitarias entre andinos y costeños. La pobreza, la urbanización y el crecimiento de las ciudades han convertido al mercado en un lugar de sobrevivencia, trabajo, y un espacio para afrontar la vida de la ciudad. El presente artículo aborda el tema de los estudios de audiencia desde el mercado popular peruano, sus medios y comunicaciones.

  4. La diversificación de los mercados como estrategia de la agricultura familiar

    Directory of Open Access Journals (Sweden)

    Clara Craviotti

    2013-01-01

    Full Text Available Partiendo de distintos abordajes teóricos sobre los mercados, el artículo analiza las formas de comercialización de los fruticultores familiares del noreste de la provincia de Buenos Aires (Argentina. El área reviste particular interés por conformar un sistema productivo local que experimenta desde hace varios años un proceso de retracción, en contraposición a la expansión del cultivo de la soja orientada a los mercados mundiales. El análisis considera el contenido de los vínculos establecidos y la composición de los capitales como condicionantes de la inserción en los mercados, y visualiza a éstos como ámbitos de interacción social donde se construyen nuevas relaciones. Argumenta que en los productores familiares la diversificación de canales comerciales refuerza a la encontrada en el plano productivo, y que los circuitos dominados por grandes empresas y los mercados locales no constituyen alternativas mutuamente excluyentes para este tipo de productores sino complementarias.

  5. Telefonía celular que genera valor al segmento medio del mercado

    OpenAIRE

    Delgado Carballido, Luis Alberto; Mazuelos Woolcott, Ricardo

    2016-01-01

    El presente estudio busca ofrecer al sector medio del mercado una propuesta enfocada en la satisfacción de sus necesidades de comunicación, con planes sencillos y un nivel de servicio superior para ayudar a mejorar las comunicaciones interpersonales, el crecimiento económico y la reducción de la pobreza. Tesis

  6. El Mercado Integrado Latinoamericano (MILA: sus expectativas y el impacto del latibex

    Directory of Open Access Journals (Sweden)

    Jorge Armando Ortegón Rojas

    2017-02-01

    Full Text Available Los objetivos principales de este trabajo son: primero, evaluar el grado en que el comportamiento del Mercado de Valores Latinoamericanos en Euros, Latibex, explica el comportamiento del Mercado Integrado Latinoamericano, MILA, y los mercados accionarios de Colombia, Chile y Perú bajo el supuesto de que por transarse valores latinoamericanos en ambas plazas debe existir relación alguna en el comportamiento de sus í­ndices bursátiles. Esto se logra mediante un análisis de correlación lineal, exponencial y logarí­tmica. Segundo, conocer el comportamiento desde el año 2009 de los mercados accionarios mencionados recientemente, y su posible tendencia a corto plazo. Esto se logra mediante un análisis de regresión lineal, exponencial, logarí­tmica y cuadrática. Lo anterior arrojó que el comportamiento del MILA es explicado en un 90,6 % por el Latibex. Adicionalmente, analizado cada í­ndice bursátil como serie de tiempo, se observa que tienen un comportamiento decreciente en general a partir del año 2012, y con una tendencia a continuar decreciendo a corto plazo.

  7. Concentración de mercado en el sector de telecomunicaciones en Venezuela

    Directory of Open Access Journals (Sweden)

    María Cristina Useche

    2008-01-01

    Full Text Available El objeto de la investigación fue establecer el grado de concentración de las operadoras habilitadas que se desempeñan en los segmentos de mercado de telefonía fi ja local y telefonía móvil celular en Venezuela para el período 2004-2007, permitiendo tener una visión de las empresas que tienen poder de mercado en el sector de telecomunicaciones en el país. Para ello se tomo como referencia el índice de Herfi ndahl-Hirschman (IHH. Se recopiló información gubernamental sobre este segmento de mercado regulado nacional. Se concluyó que existe un alto nivel de concentración en cada rubro, siendo las operadoras habilitadas CANTV y MOVISTAR las que tienen el poder del mercado en las telecomunicaciones a nivel nacional, afectando la competencia y desestimulando a otras empresas a desempeñarse en el ámbito nacional

  8. Estimación de métricas de riesgo de mercado usando mixturas gaussianas

    Directory of Open Access Journals (Sweden)

    Jorge Rosales Contreras

    2016-01-01

    Full Text Available Los principales modelos financieros para la estimación del riesgo de mercado suponen que los rendimientos de los activos siguen una distribución Normal o se basan en la distribución empírica. Con frecuencia, el supuesto de normalidad se da por hecho; sin embargo, resulta poco realista debido a las características de exceso de curtosis y de asimetría observadas en el comportamiento real de los retornos. En este trabajo presentamos evidencia de que las mixturas gaussianas finitas constituyen un medio eficiente para modelar la distribución de los rendimientos de los activos financieros. Estudiamos el modelo y derivamos expresiones para las métricas usuales de riesgo de mercado. Ilustramos su aplicación calculando métricas de riesgo para una cartera de activos del mercado mexicano, con el modelo propuesto y comparándolas con modelos ampliamente usados en el mercado. Derechos Reservados © 2015 Universidad Nacional Autónoma de México, Facultad de Contaduría y Admi- nistración. Este es un artículo de acceso abierto distribuido bajo los términos de la Licencia Creative Commons CC BY-NC-ND 4.0.

  9. O mercado de bens e serviços com apelos ambientais

    Directory of Open Access Journals (Sweden)

    Eliana Boaventura Bernardes Moura Alves

    2013-12-01

    Full Text Available A crescente conscientização ambiental da sociedade tem alavancado o consumo de produtos e serviços com apelo ambiental, formando o denominado “mercado verde”, que tem impulsionado a economia e estimulado o desenvolvimento sustentável. Este trabalho teve como objetivo analisar o mercado de bens e serviços com apelos ambientais e inferir sobre suas motivações e tendências. O método utilizado foi a pesquisa bibliográfica a fim de construir um estudo descritivo, que reunisse e compilasse informações deste mercado. Constatou-se que o marketing aliado à responsabilidade ambiental, vem alcançando cada vez mais espaço nos meios de comunicação das empresas e funciona como ferramenta estratégica, favorecendo a imagem corporativa e a competitividade, além de conquistar e fidelizar consumidores. O “mercado verde” revela tendências de crescimento, tanto no quesito número de consumidores, como também de competidores. Tal fato pode requerer um marketing mais agressivo e mais informativo por parte das empresas, no intuito de manter e conquistar novos clientes.

  10. Neuromarketing: Nuevas fronteras de la investigación de mercados

    OpenAIRE

    Sutil Martín, Dolores Lucía

    2012-01-01

    Conferencia realizada en los "Lunes de Comercio" por la Cátedra de Comercio de la Universidad de la Rioja el día 15 de Octubre de 2012 Muestra las nuevas tendencias de la investigación de mercados con los avances de la neurociencia. Economía de la Empresa

  11. Testing a Threshold: An Approximate Replication of Johnson, Mercado & Acevedo 2012

    Science.gov (United States)

    Johnson, Mark D.; Nicodemus, Christine L.

    2016-01-01

    In order to better understand the role of working memory in second language (L2) written production, this study contributes to recent research attempting to apply Kellogg's model of working memory in first language (L1) writing to L2 writing research (Ellis & Yuan 2004; Ong & Zhang 2010; Johnson, Mercado & Acevedo 2012). This paper…

  12. Motivaciones de los Consumidores para Asistir a los Mercados de los Agricultores de Utah

    OpenAIRE

    Curtis, Kynda; Gumirakiza, J. Dominique

    2014-01-01

    Los mercados de los agricultores (FM por sus siglas en inglés) ofrecen oportunidades a los agricultores locales y pequeñas empresas para vender directamente a los consumidores, incrementar su base de clientes, así como probar nuevos productos y estrategias de precios.

  13. A lógica de mercado no discurso jornalístico

    Directory of Open Access Journals (Sweden)

    Alda de Almeida

    2005-12-01

    Full Text Available A influência dos modelos de decisão baseados na lógica de mercado no cotidiano da imprensa brasileira. A dicotomia centro-periferia e o olhar do eixo Rio-São Paulo sobre o Brasil. Os mitos da instantaneidade e da velocidade da informação. Reportagem e credibilidade.

  14. Análisis del comportamiento de mercado de la pitahaya (Hylocereus undatus en Costa Rica

    Directory of Open Access Journals (Sweden)

    Olman Quirós Madrigal

    2010-10-01

    Full Text Available La pitahaya (Hylocereus undatus es una planta que pertenece a la familia de las cactaceae, que se puede consumir como fruta fresca o procesada como pulpa; sin embargo, en Costa Rica su uso no está muy difundido, por lo que el mercado meta es la población de origen nicaragüense residente en el país, quienes catalogan el producto como de consumo tradicional o masivo.Es por esto que resulta importante retomar el estudio de los componentes del mercado, en donde se destaca no sólo por ser una fruta con componentes nutricionales que aportan beneficios a la salud humana, sino tambien porque suple una demanda latente y su cultivo puede ser una actividad alternativa para productores de zonas con condiciones agroecológicas adversas. En relación con el abastecimiento del producto en el mercado nacional, se enfatiza que su procedencia es nacional pero principalmente se importa como fruta fresca y pulpa de Nicaragua y, en menor grado, de Colombia.El precio de la pitahaya en el mercado nacional está estrechamente relacionado con los precios de importación, ya que la oferta principal proviene del producto importado, por lo que ha tenido un comportamiento creciente al pasar, de US$0,574 en el año 2003, a US$1,18 por kg en el 2007.

  15. Tyramine functions as a toxin in honey bee larvae during Varroa-transmitted infection by Melissococcus pluton.

    Science.gov (United States)

    Kanbar, G; Engels, W; Nicholson, G J; Hertle, R; Winkelmann, G

    2004-05-01

    From wounds of honey bee pupae, caused by the mite Varroa destructor, coccoid bacteria were isolated and identified as Melissococcus pluton. The bacterial isolate was grown anaerobically in sorbitol medium to produce a toxic compound that was purified on XAD columns, gelfiltration and preparative HPLC. The toxic agent was identified by GC-MS and FTICR-MS as tyramine. The toxicity of the isolated tyramine was tested by a novel mobility test using the protozoon Stylonychia lemnae. A concentration of 0.2 mg/ml led to immediate inhibition of mobility. In addition the toxicity was studied on honey bee larvae by feeding tyramine/water mixtures added to the larval jelly. The lethal dosis of tyramine on 4-5 days old bee larvae was determined as 0.3 mg/larvae when added as a volume of 20 microl to the larval food in brood cells. Several other biogenic amines, such as phenylethylamine, histamine, spermine, cadaverine, putrescine and trimethylamine, were tested as their hydrochloric salts for comparison and were found to be inhibitory in the Stylonychia mobility test at similar concentrations. A quantitative hemolysis test with human red blood cells revealed that tyramine and histamine showed the highest membranolytic activity, followed by the phenylethylamine, trimethylamine and spermine, while the linear diamines, cadaverine and putrescine, showed a significantly lower hemolysis when calculated on a molar amine basis. The results indicate that tyramine which is a characteristic amine produced by M. pluton in culture, is the causative agent of the observed toxic symptoms in bee larvae. Thus this disease, known as European foulbrood, is possibly an infection transmitted by the Varroa destructor mite.

  16. Origin and mobility of hydrocarbon gases in alkaline plutons : the example of the Khibina complex, NW Russia

    Energy Technology Data Exchange (ETDEWEB)

    Treloar, P.J.; Beeskow, B.; Rankin, A.H. [Kingston Univ., Kingston upon Thames (United Kingdom). School of Earth Sciences; Potter, J. [Western Ontario Univ., London, ON (Canada). Dept. of Earth Science; Nivin, V. [Geological Inst., Apatity (Russian Federation). Kola Science Centre

    2006-07-01

    The origin and distribution of abiogenic hydrocarbon gases (HCGs) was discussed with particular reference to HCGs in the Khibina pluton which are dominated by methane (CH{sub 4}) with minor amounts of higher hydrocarbons and hydrogen (H{sub 2}). Although isotopic data and hydrocarbon species ratios point to an abiogenic source, they do not distinguish between primary magmatic hydrocarbons and those generated by late magmatic re-speciation or post-magmatic Fischer-Tropsch (FT) synthesis. Some rock textures suggest limited CH{sub 4} production by FT synthesis, but the presence of primary, syn-magmatic CH{sub 4}-rich fluid inclusions, and the absence of primary and secondary carbon dioxide (CO{sub 2}) rich inclusions, suggest a dominantly early magmatic origin for the HCGs. The permeability and porosity in the Khibina pluton can be constrained by the distribution and geometry of fluid inclusion planes (FIPs) and open cracks (OCs), as well as by the magnitude and pathways of fluid flow. Orientation data for FIPs and OCs, obtained from oriented thin sections, revealed a range of orientations in sub-parallel arrays, suggesting continual re-activation of old fracture systems. The extensive occurrence of OCs and sealed FIPs points to long lived porosities and permeabilities with large fluid fluxes integrated over time. FIP and OC density values were found to be consistent with gas release patterns characterized by spontaneous release during mining of large volumes of HCG stored in a network of interconnected, sealed microfractures and fluid inclusion planes that unzip during stress. It was determined that the HCGs have a primary magmatic origin although there is local evidence for limited post-magmatic FT synthesis. Long term continuous gas migration has occurred within the complex through an interconnected set of fractures. FIPs represent aliquots of gas sealed during open system migration. It was concluded that the complex contains a potentially economically viable

  17. Incremental growth of an upper crustal, A-type pluton, Argentina: Evidence of a re-used magma pathway

    Science.gov (United States)

    Alasino, Pablo H.; Larrovere, Mariano A.; Rocher, Sebastián; Dahlquist, Juan A.; Basei, Miguel A. S.; Memeti, Valbone; Paterson, Scott; Galindo, Carmen; Macchioli Grande, Marcos; da Costa Campos Neto, Mario

    2017-07-01

    Carboniferous igneous activity in the Sierra de Velasco (NW Argentina) led to the emplacement of several magmas bodies at shallow levels (relationships) intrusive units are: (1) the Asha unit (340 ± 7 Ma): a tabular to funnel-shaped intrusion emplaced during a regional strain field dominated by WSW-ENE shortening with contacts discordant to regional host-rock structures; (2) the San Blas unit (344 ± 2 Ma): an approximate cylindrical-shaped intrusion formed by multiple batches of magmas, with a roughly concentric fabric pattern and displacement of the host rock by ductile flow of about 35% of shortening; and (3) the Hualco unit (346 ± 6 Ma): a small body with a possible mushroom geometry and contacts concordant to regional host-rock structures. The magma pulses making up these units define two groups of A-type granitoids. The first group includes the peraluminous granitic rocks of the Asha unit generated mostly by crustal sources (εNdt = - 5.8 and εHft in zircon = - 2.9 to - 4.5). The second group comprises the metaluminous to peraluminous granitic rocks of the youngest units (San Blas and Hualco), which were formed by a heterogeneous mixture between mantle and crustal sources (εNdt = + 0.6 to - 4.8 and εHft in zircon = + 3 to - 6). Our results provide a comprehensive view of the evolution of an intrusive complex formed from multiple non-consanguineous magma intrusions that utilized the same magmatic plumbing system during downward transfer of host materials. As the plutonic system matures, the ascent of magmas is governed by the visco-elastic flow of host rock that for younger batches include older hot magma mush. The latter results in ductile downward flow of older, during rise of younger magma. Such complexes may reflect the plutonic portion of volcanic centers where chemically distinct magmas are erupted.

  18. Orientação para o Mercado no Segmento Hoteleiro: o caso português

    Directory of Open Access Journals (Sweden)

    Mario Barata Raposo

    2010-07-01

    Full Text Available Resumo O objectivo deste estudo foi medir o grau de orientação para o mercado dos maiores grupos hoteleiros de Portugal. Após uma breve explanação sobre a orientação para o mercado e o segmento hoteleiro em Portugal apresentou-se um estudo empírico realizado junto dos maiores 20 grupos de hotéis de Portugal, utilizando como instrumento de colecta de dados, a tradicional escala Markor (Market orientation adaptada ao sector hoteleiro. Constatou-se nas organizações investigadas uma boa capacidade de geração de informações de mercado e resposta ao mercado. Porém os resultados obtidos com o constructo da disseminação de informações de mercado ficaram abaixo das expetactivas. Portanto, o desafio actual para as principais redes de hotéis de Portugal é propiciar a melhoria da disseminação interna das informações que os profissionais de marketing recolhem junto ao mercado. Palavras-chave: gestão do marketing; orientação para o mercado; markor; sector hoteleiro em Portugal. Abstract The objective of this study was to measure level of orientation for the market of the largest hotel groups of Portugal. After a brief explanation on the market orientation and the hotel segment in Portugal an empiric study was presented performed with the largest groups of 20 hotels of Portugal, using as an instrument of collection data, the traditional Markor scale (market orientation adapted to the hotel sector. It was found in the investigated organizations a good capacity to generate market information and response to the market. However the results obtained with the construct of the dissemination of market information were below the expectations. So the current challenge for the main networks of hotels in Portugal is to improve the internal dissemination of information that marketing professionals gathered at the market. Keywords: marketing management, orientation to the market, markor, hotel sector in Portugal.

  19. La transformación de los mercados municipales de Madrid. Análisis legislativo, comercial, y económico de los mercados de abastos madrileños

    OpenAIRE

    Rodríguez Sebastián, Alejandro

    2014-01-01

    ResumenDurante la última década, el Ayuntamiento de Madrid ha desarrollado diferentes políticas con el objetivo de revitalizar los mercados de abastos de la ciudad. Una de ellas ha sido la inserción de cadenas de supermercados junto a las estructuras comerciales tradicionales de los mercados, actuando a modo de "locomotoras’ económicas. Por otro lado, es reconocible la aparición en ciertos mercados de nuevos patrones de consumo, unos asociados a estilos de vida propios de élites y otros surgi...

  20. The evaluation of physico-chemical parameters of the Nasrand Plutonic complex by using mineral composition

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    Fatemeh Sarjoughian

    2017-02-01

    Full Text Available Introduction Mineral composition is sensitive to variations in the composition of the magma and can be used to characterize the physical conditions of crystallization such as temperature, pressure, oxygen fugacity and water content. The studies have demonstrated that geobarometery by amphibole provides a tool for determining the depth of crystallization and knowledge of the depth of crystallization of hornblende through to solidification of calc-alkaline plutons (Anderson and Smith, 1995. The composition of pyroxene can be used as crystallization pressure and temperature indicators of pyroxene too. Anlytical methods The mineral compositions of the Nasrand intrusion were determined by electron microprobe, with special emphasis on the amphibole, feldspar, and pyroxene at the Naruto University, Japan, the EPMA (Jeol- JXA-8800R was used at operating conditions of 15 kV, 20 nA acceleration voltage and 20s counting time. Results The Nasrand intrusion (33°13'–33°15' N, 52°33'–52°34'E with an outcrop area of about 40 km2 is situated in the Urumieh–Dokhtar magmatic belt, SE of Ardestan. It is composed of granite and granodiorite and various dikes of diorite and gabbro which are intruded in it. It is intruded into Eocene volcanic rocks, including andesite, rhyolite, and dacite. The petrographical studies indicate that the granitic and granodioritic rocks contain major minerals such as quartz, K-feldspar, plagioclase, and amphibole, which are in an approximate equilibrium state. The gabbroic-dioritic dikes usually show microgranular porphyric texture. They mainly consist of plagioclase, amphibole, and pyroxene. The plagioclase shows variable composition from albite to oligoclase in the granitoid rocks and from oligoclase to bytownite in dioritic and gabbroic dikes (Deer et al., 1991. The amphiboles are calcic and their composition varies from hornblende to actinolite, whereas the composition of the basic dikes is inclined to hastingsite (Leake et

  1. Cercas e pontes: o movimento GLBT e o mercado GLS na cidade de São Paulo

    OpenAIRE

    Isadora Lins França

    2006-01-01

    A presente dissertação é um estudo sobre o movimento GLBT (Gays, Lésbicas, Bissexuais e Transgêneros) e as relações desenvolvidas por esse movimento com um mercado segmentado destinado a homossexuais, ou mercado GLS (Gays, Lésbicas e Simpatizantes). O trabalho procura compreender essas relações a partir da pesquisa de campo realizada com foco na Associação da Parada do Orgulho GLBT de São Paulo (APOGLBT). Além disso, há um esforço no sentido de entender as dinâmicas do mercado GLS e do movime...

  2. Diseño de un modelo de crecimiento de mercado para una comercializadora de Maquinaria Industrial.

    OpenAIRE

    Medina Blancas, Adrián.

    2015-01-01

    El objeto de este estudio es determinar el por qué las empresas dedicadas a la comercialización de productos industriales de rehúso como lo son maquinaria, autos y algunos desechos industriales no cuentan con una participación sólida en el mercado de la compra venta en la zona centro del país. Partiendo del supuesto de que la poca explotación del mercado y sus oportunidades de crecimiento comercial son por la falta de conocimiento de oportunidad de mercado que se puede presenta...

  3. HMV Ingenieros Ltda : un modelo de internacionalización para entrar en el mercado Triángulo Norte

    OpenAIRE

    Marín Cadavid, Carolina

    2012-01-01

    Esta investigación por medio de un estudio de caso estudia el proceso de internacionalización que debería seguir HMV ingenieros Ltda, con el objetivo de ingresar en el mercado Triángulo Norte. Un paso a paso es el modelo que debe llevarse a cabo como guía para incursionar en dicho mercado. Con la experiencia de HMV Ingenieros Ltda, se concluye que presenta una fortaleza para establecer presencia comercial (modo 3) en el mercado de Triángulo Norte. Adicionalmente acorde con las tendencias de l...

  4. Criterios para la fijación del valor de las acciones negociables en el mercado de capitales

    OpenAIRE

    Martinez Caraballo, Hugo Ramon; Jimenez, Edison E.M.

    2009-01-01

    El objetivo del trabajo fue, determinar los criterios para la fijación del valor de las acciones negociables en el mercado de capitales, a raíz de la aparición de nuevos factores de riesgo. Para ello, se caracterizo el mercado de capitales en Venezuela. Se determino los principales indicadores económicos y de mercado bursátil para la fijación del valor de las acciones. Se distinguió los factores de riesgo que engloban la fijación del valor de las acciones y las características del contexto p...

  5. Caracterización del mercado accionario colombiano, 2001-2006: un análisis comparativo

    OpenAIRE

    Jorge Mario Uribe Gil

    2007-01-01

    Partiendo de la base teórica de que existe una relación positiva entre el desarrollo del mercado de capitales y el crecimiento económico, se construyen indicadores de tamaño, liquidez, riesgo, integración y eficiencia, para el mercado accionario colombiano. Para esto, se usan medidas tradicionales de profundidad del mercado, además de modelos GARCH, estimadores de razones de varianzas heteroscedásticamente robustos y asintóticamente consistentes e indicadores de integración internacional basa...

  6. Plan de Marketing para la implantación de la cadena minorista Día en el mercado italiano

    OpenAIRE

    Sánchez-Molina Pando, Aarón

    2015-01-01

    RESUMEN: La empresa Día es una de las principales líderes de la distribución en España que decide estudiar la posibilidad de entrar en el mercado italiano. Está presente en España, Portugal, Brasil, Argentina y China. Tras analizar la situación actual en los mercados en los que se encuentra y la situación del mercado potencial tanto a nivel de macroentorno (PIB, deuda, paro, demografía y salario medio) como de microentorno (competencia, proveedores y clientes), la empresa elaborará un anál...

  7. Análisis de la transformación de los mercados de abastos madrileños

    OpenAIRE

    Rodríguez Sebastián, Alejandro

    2015-01-01

    Durante la última década, el Ayuntamiento de Madrid ha desarrollado diferentes políticas con el objetivo de revitalizar los mercados de abastos de la ciudad. Una de ellas ha sido la inserción de cadenas de supermercados junto a las estructuras comerciales tradicionales de los mercados, actuando a modo de ‘locomotoras’ económicas. Por otro lado, es reconocible la aparición en ciertos mercados de nuevos patrones de consumo, unos asociados a estilos de vida propios de élites y otros surgidos a r...

  8. Estrutura do mercado de trabalho metropolitano na região sul do Brasil, em 1995 e em 2005

    OpenAIRE

    Sampaio,Armando Vaz

    2012-01-01

    Para melhor compreender as transições que ocorrem no mercado de trabalho, é importante considerar os fluxos de estar empregado, desempregado e fora do mercado de trabalho e as probabilidades envolvidas em função de variáveis socioeconômicas e geográficas. O modelo econométrico utilizado foi o multinomial logit, em que se observou que há diferença de gênero com respeito a estar ocupado e fora do mercado de trabalho, sendo que, para a primeira situação, a probabilidade é maior para o homem e, p...

  9. Definición del mercado de trigo cristalino en el valle del Yaqui, México

    OpenAIRE

    Garza Lagler, María Cristina; Taddei Bringas, Cristina

    2016-01-01

    Resumen: El valle del Yaqui es una región productora de trigo en el noroeste de México, cuyas agroempresas tienen una participación creciente en el mercado internacional. El objetivo de este trabajo es una aproximación a la definición del mercado del trigo cristalino que se produce en su territorio, para lo cual se realizó un análisis descriptivo apoyado en entrevistas a actores estratégicos del sistema de producción. Los resultados indican que este grano tiene tres mercados: la industria de ...

  10. La importancia de la inteligencia de mercados en la actividad exportadora de las empresas españolas

    OpenAIRE

    Navarro-García, Antonio; Barrera-Barrera, Ramón; Peris-Ortiz, Marta

    2013-01-01

    El objetivo de la presente investigación es responder al gap investigador existente en la literatura sobre el rol que juega la inteligencia de mercados en la actividad exportadora. Específicamente se pretende conocer los efectos que ejerce la inteligencia de mercados en las interrelaciones entre las distancias de mercados (doméstico vs. extranjeros) percibidas por los responsables de exportación, las decisiones estratégicas de marketing mix (estandarización vs. adaptación) y el...

  11. Mercados e racionalidades: a perspectiva de Alberto Guerreiro Ramos e Cornelius Castoriadis

    Directory of Open Access Journals (Sweden)

    Manoel Fernandes Nery

    Full Text Available Mercados e racionalidades são duas categorias das Ciências Sociais bastante discutidas na academia. Considera-se Max Weber um dos pioneiros no estudo da categoria racionalidades, da qual teria se originado grande parte das interpretações dominantes nas Ciências Sociais, em particular da Sociologia. Os autores que descrevem o mercado enfatizam diferentes aspectos, e os relatos sobre seu aparecimento histórico são também divergentes. Não existe, portanto, nas Ciências Sociais, uma interpretação única sobre as funções e a historicidade do mercado, bem como não há unanimidade em relação às formas de racionalidades dominantes. Este ensaio teórico traz a perspectiva de dois autores sobre mercados e racionalidades, sem a intenção de absolutizar seu pensamento ou limitar suas contribuições aos temas. Ramos (1981 concebe a razão como uma força inerente ao indivíduo, a qual denomina razão substantiva, assinalando que, com Thomas Hobbes, a razão configura um cálculo utilitário de consequências. Adicionalmente, Ramos (1981 vê o mercado como uma ameaça à liberdade e autonomia dos indivíduos. Para Castoriadis (1992b, 1996, 1999b, a razão está presente em um coletivo social anônimo, sendo homem e sociedade inseparáveis do contexto sócio-histórico. Já o mercado, bem ou mal, funciona, apesar da manipulação dos consumidores e da violência contra os trabalhadores. Em comum, os autores defendem a liberdade e a autonomia dos indivíduos. Conclui-se o ensaio corroborando a visão de Alves (2007, pois as elucidações apresentadas ao longo do texto indicam que as divergências não estão nas teorias e nos métodos, mas na natureza do objeto estudado.

  12. La Migración de los Padres como Factor de Riesgo en la Educación de los Hijos en la Región Centro de Coahuila, Motivado por las Crisis y la Reconversión de Altos Hornos de México, S.A. de C.V.

    Directory of Open Access Journals (Sweden)

    Juan Hermilo Zúñiga Cortez

    2010-06-01

    Full Text Available La crisis económica mexicana motiva el incremento de la emigración; en Monclova, Coahuila la empresa AHMSA, suspende el proyecto FENIX y a partir del 2008 realiza recortes por 12,000 plazas. Se encuestan en las ciudades de Waco, Austin y San Antonio, Texas a 92 migrantes, determinando impactos negativos en la educación de los hijos, en la mayoría las familias se ven obligados a trabajar éstos y la esposa con mejoría en la situación económica, pero dañada la estructura familiar por falta de comunicación y presencia del jefe familiar.

  13. Geochemical Relationships between Volcanic and Plutonic Upper to Mid Crustal Exposures of the Rosario Segment, Alisitos Arc (Baja California, Mexico): An Outstanding Field Analog to the Izu-Bonin-Mariana Arc

    Science.gov (United States)

    Morris, R.; DeBari, S. M.; Busby, C. J.; Medynski, S.

    2015-12-01

    Exposed paleo-arcs, such as the Rosario segment of the Cretaceous Alisitos Arc in Baja California, Mexico, provide an opportunity to explore the evolution of arc crust through time. Remarkable 3-D exposures of the Rosario segment record crustal generation processes in the volcanic rocks and underlying plutonic rocks. In this study, we explore the physical and geochemical connection between the plutonic and volcanic sections of the extensional Alisitos Arc, and elucidate differentiation processes responsible for generating them. These results provide an outstanding analog for extensional active arc systems, such as the Izu-Bonin-Mariana (IBM) Arc. Upper crustal volcanic rocks have a coherent stratigraphy that is 3-5 km thick and ranges in composition from basalt to dacite. The most felsic compositions (70.9% SiO2) are from a welded ignimbrite unit. The most mafic compositions (51.5% SiO2, 3.2% MgO) are found in basaltic sill-like units. Phenocrysts in the volcanic units include plagioclase +/- amphibole and clinopyroxene. The transition to deeper plutonic rocks is clearly an intrusive boundary, where plutonic units intrude the volcanic units. Plutonic rocks are dominantly a quartz diorite main phase with a more mafic, gabbroic margin. A transitional zone is observed along the contact between the plutonic and volcanic rocks, where volcanics have coarsely recrystallized textures. Mineral assemblages in the plutonic units include plagioclase +/- quartz, biotite, amphibole, clinopyroxene and orthopyroxene. Most, but not all, samples are low K. REE patterns are relatively flat with limited enrichment. Normalization diagrams show LILE enrichment and HFSE depletion, where trends are similar to average IBM values. We interpret plutonic and volcanic units to have similar geochemical relationships, where liquid lines of descent show the evolution of least to most evolved magma types. We provide a model for the formation and magmatic evolution of the Alisitos Arc.

  14. The link between volcanism and plutonism in epizonal magma systems; high-precision U–Pb zircon geochronology from the Organ Mountains caldera and batholith, New Mexico

    Science.gov (United States)

    Rioux, Matthew; Farmer, Lang; Bowring, Samuel; Wooton, Kathleen M.; Amato, Jeffrey M.; Coleman, Drew S.; Verplanck, Philip L.

    2016-01-01

    The Organ Mountains caldera and batholith expose the volcanic and epizonal plutonic record of an Eocene caldera complex. The caldera and batholith are well exposed, and extensive previous mapping and geochemical analyses have suggested a clear link between the volcanic and plutonic sections, making this an ideal location to study magmatic processes associated with caldera volcanism. Here we present high-precision thermal ionization mass spectrometry U–Pb zircon dates from throughout the caldera and batholith, and use these dates to test and improve existing petrogenetic models. The new dates indicate that Eocene volcanic and plutonic rocks in the Organ Mountains formed from ~44 to 34 Ma. The three largest caldera-related tuff units yielded weighted mean 206Pb/238U dates of 36.441 ± 0.020 Ma (Cueva Tuff), 36.259 ± 0.016 Ma (Achenback Park tuff), and 36.215 ± 0.016 Ma (Squaw Mountain tuff). An alkali feldspar granite, which is chemically similar to the erupted tuffs, yielded a synchronous weighted mean 206Pb/238U date of 36.259 ± 0.021 Ma. Weighted mean 206Pb/238U dates from the larger volume syenitic phase of the underlying Organ Needle pluton range from 36.130 ± 0.031 to 36.071 ± 0.012 Ma, and the youngest sample is 144 ± 20 to 188 ± 20 ka younger than the Squaw Mountain and Achenback Park tuffs, respectively. Younger plutonism in the batholith continued through at least 34.051 ± 0.029 Ma. We propose that the Achenback Park tuff, Squaw Mountain tuff, alkali feldspar granite and Organ Needle pluton formed from a single, long-lived magma chamber/mush zone. Early silicic magmas generated by partial melting of the lower crust rose to form an epizonal magma chamber. Underplating of the resulting mush zone led to partial melting and generation of a high-silica alkali feldspar granite cap, which erupted to form the tuffs. The deeper parts of the chamber underwent continued recharge and crystallization for 144 ± 20 ka after the

  15. PLUTON: Three-group neutronic code for burnup analysis of isotope generation and depletion in highly irradiated LWR fuel rods

    Energy Technology Data Exchange (ETDEWEB)

    Lemehov, Sergei E; Suzuki, Motoe [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment

    2001-08-01

    PLUTON is a three-group neutronic code analyzing, as functions of time and burnup, the change of radial profiles, together with average values, of power density, burnup, concentration of trans-uranium elements, plutonium buildup, depletion of fissile elements, and fission product generation in water reactor fuel rod with standard UO{sub 2}, UO{sub 2}-Gd{sub 2}O{sub 3}, inhomogeneous MOX, and UO{sub 2}-ThO{sub 2}. The PLUTON code, which has been designed to be run on Windows PC, has adopted a theoretical shape function of neutron attenuation in pellet, which enables users to perform a very fast and accurate calculation easily. The present code includes the irradiation conditions of the Halden Reactor which gives verification data for the code. The total list of trans-uranium elements included in the calculations consists of {sub 92}U{sup 233-239}, {sub 93}Np{sup 237-239}, {sub 94}Pu{sup 238-243}, {sub 95}Am{sup 241-244} (including isomers), and {sub 96}Cm{sup 242-245}. Poisoning fission products are represented by {sub 54}Xe{sup 131,133,135}, {sub 48}Cd{sup 113}, {sub 62}Sm{sup 149,151,152}, {sub 64}Gd{sup 154-160}, {sub 63}Eu{sup 153,155}, {sub 36}Kr{sup 83,85}, {sub 42}Mo{sup 95}, {sub 43}Tc{sup 99}, {sub 45}Rh{sup 103}, {sub 47}Ag{sup 109}, {sub 53}I{sup 127,129,131}, {sub 55}Cs{sup 133}, {sub 57}La{sup 139}, {sub 59}Pr{sup 141}, {sub 60}Nd{sup 143-150}, {sub 61}Pm{sup 147}. Fission gases and volatiles included in the code are {sub 36}Kr{sup 83-86}, {sub 54}Xe{sup 129-136}, {sub 52}Te{sup 125-130}, {sub 53}I{sup 127-131}, {sub 55}Cs{sup 133-137}, and {sub 56}Ba{sup 135-140}. Verification has been performed up to 83 GWd/tU, and a satisfactory agreement has been obtained. (author)

  16. Liberalización financiera y segmentación de mercados.

    Directory of Open Access Journals (Sweden)

    Isabel Dauner.

    1998-08-01

    Full Text Available En contra de la llamada “Escuela de la Represión Financiera”, este artículo muestra, a partir de la experiencia de Nicaragua, que la liberalización financiera no es una condición suficiente para el desarrollo de un sistema financiero eficiente. En el sector rural nicaragüense no existen mercados financieros capaces de jugar su rol de intermediador entre ahorrantes e inversionistas, sino segmentos de mercado aislados entre sí. En este, como en oros países del continente latinoamericano, encontramos la presencia de un conjunto de limitantes estructurales e institucionales, más adecuadas aún en las zonas rurales, que no son tomadas en cuenta en la planificación de las reformas financieras y que, por ello, impiden que las mismas produzcan el impacto esperado.

  17. Cultura alfabética y mercado cultural en Colombia y en España

    Directory of Open Access Journals (Sweden)

    Ancízar Narváez

    2010-01-01

    Full Text Available En el presente artículo se establece una comparación entre la oferta y la demanda de cultura alfabética a través de la descripción de los sistemas educativos; así mismo, se compararan la oferta y el consumo mediáticos a través de la descripción de los sistemas mediáticos de Colombia y España. Con estos insumos, se intenta establecer las características del mercado cultural en cada uno de los dos países y sus posibilidades de inserción en el mercado global del conocimiento.

  18. O mercado dos detergentes máquina roupa : a pressão promocional

    OpenAIRE

    Róis, Marta Alexandra Grangeiro

    2012-01-01

    Projecto de Mestrado em Economia da Empresa e da Concorrência / Classificação JEL: L81, Q51 O presente estudo tem como objetivo principal analisar a evolução da pressão promocional no mercado dos detergentes máquina roupa, com especial ênfase no canal dinâmico. Para tal foi utilizado o modelo de análise estrutural proposto por Porter (1980), mais conhecido pelo modelo das cinco forças. Com base na informação disponível sobre o mercado foram analisadas as cinco forças das quais foi possí...

  19. Burbujas financieras y comportamiento reciente de los mercados de acciones en América Latina

    Directory of Open Access Journals (Sweden)

    Jorge Mario Uribe

    2014-07-01

    Full Text Available Con el fin de poner a prueba hipótesis recientes en la literatura económica, según las cuales la formación de burbujas periódicas y sincronizadas en los mercados globales es consecuencia de la migración recurrente de capitales de portafolio, en este trabajo se estiman los periodos de burbujas financieras en los mercados de acciones latinoamericanos de mayor tamaño relativo; asimismo, la cronología de tales burbujas se compara con la estimada para el caso estadounidense. Estas burbujas se estiman haciendo uso de un estadístico de signo, con ajuste recursivo de mediana, el cual sirve para contrastar la hipótesis de caminata aleatoria versus alternativas explosivas. Se encuentra evidencia favorable para la hipótesis de partida y se exploran posibles ampliaciones de ésta.

  20. Competencia entre México y China en el interior del mercado de Estados Unidos

    OpenAIRE

    Gracia-Hernández, Maximiliano

    2013-01-01

    En este artículo se muestra la dinámica que han seguido las exportaciones de México y China en el interior del mercado de Estados Unidos (EU), se considera la cadena hilo-textil-confección a cuatro dígitos, y se analizan los capítulos 61, 62 y 63. En el año 2000 México era un líder en todas las ramas que componen los capítulos 61 a 63, actualmente sólo cinco de las 30 ramas analizadas han logrado incrementar sus exportaciones en el mercado de EU. Consideramos una verdad a medias que el total ...

  1. MICROMUNDO PARA SIMULAR UN MERCADO ELÉCTRICO DE CORTO PLAZO

    Directory of Open Access Journals (Sweden)

    Carlos Jaime Franco

    2012-12-01

    Full Text Available En este trabajo se presenta un micromundo para la simulación de una bolsa de energía, el cual se elaboró en respuesta a la necesidad de facilitar el aprendizaje del esquema de bolsa de energía con despacho centralizado a los interesados en este mercado. El micromundo cuenta con un modelo climático para simular los fenómenos de El Niño y La Niña, y con un modelo para la generación de los precios de oferta de los generadores, además es altamente parametrizable y permite simular diversos tipos de mercados eléctricos.

  2. Cachorros e humanos: Mercado de rações pet em perspectiva sociológica

    OpenAIRE

    Mazon, Marcia da Silva; Moura, Wandgleisom Garcia de

    2017-01-01

    Resumo: O artigo discute mudanças no mercado de rações para animais de estimação a partir do referencial da Sociologia Econômica. Os dados empíricos utilizados são provenientes de entrevistas realizadas com veterinários e donos de pet shops, todas realizadas em Florianópolis, estado de Santa Catarina. Ao longo do artigo abordamos o processo de globalização e suas consequências no mercado de rações. O movimento de fusões e aquisições de empresas multinacionais do setor de rações pet na década ...

  3. Redes alimentarias alternativas en grandes ciudades: los mercados de productores agrarios en Madrid

    Directory of Open Access Journals (Sweden)

    Ricardo Méndez Gutiérrez del Valle

    2017-01-01

    Full Text Available Las redes alimentarias alternativas constituyen una temática de investigación emergente en los estudios urbanos, que cuestiona los modelos dominantes de producción, distribución y consumo de alimentos. Una de sus manifestaciones son los mercados de productores, que ponen en contacto directo a productores periurbanos y rurales con consumidores urbanos, favoreciendo las relaciones de proximidad y los circuitos cortos. El artículo investiga los mercados de productores en Madrid mediante una estrategia multimétodo que combina entrevistas, encuestas y otras técnicas complementarias. Los resultados confirman su diversidad interna, identifican las estrategias de los diferentes actores y delimitan su impacto territorial, mostrando también sus limitaciones.

  4. Contratos bilaterais em mercados de energia elétrica multiagente: protocolo de rede de contratos

    OpenAIRE

    Fragoso, Frederico Parente

    2015-01-01

    O setor elétrico tem assistido a mudanças profundas na sua estrutura e organização, devido à sua liberalização, o que levou a uma maior competitividade nos mercados de energia elétrica. Uma gestão eficiente dos mercados de energia torna-se cada vez mais uma prioridade devido aos riscos que estes podem apresentar, aliado à elevada volatilidade dos preços e volumes nos diferentes períodos horários (incertezas na produção e consumo). A liberalização do setor elétrico levou à criação de sim...

  5. INSERÇÃO DA AVICULTURA DE CORTE MATOGROSSENSE NO MERCADO INTERNACIONAL DE CARNE DE FRANGO

    Directory of Open Access Journals (Sweden)

    Cleiton Franco

    2014-08-01

    Full Text Available Desde 2002, o estado de Mato Grosso tem apresentado crescimento contínuo em exportação de carne de aves. Apesar de seu representante pequeno nas exportações totais brasileiras, mostrou competitividade no mercado internacional. O principal objetivo desta pesquisa foi conhecer e compreender o que aconteceu nesta indústria. Nesta forma foi possível mostrar o perfil exportadores locais, a sua capacidade de exportação, mercados-alvo e os problemas de exportação. Assim, foi possível propor políticas públicas que poderiam ajudá-los a superar dificuldades, melhorar a competitividade desta indústria.

  6. El entorno actual del mercado y la necesidad de traducción especializada en Alemania

    Directory of Open Access Journals (Sweden)

    ANGELIKA HENNECKE

    2017-01-01

    Full Text Available En este artículo se hace una breve descripción y evaluación del mercado laboral para traductores en Alemania. Se consideran los cambios ocurridos con base en las nuevas tecnologías y formas de comunicación a través del internet y los medios digitales. Se describen las experiencias con este tipo de formación en Alemania, con especial atención al Máster en Traducción Especializada de la Universidad de Ciencias Aplicadas de Colonia (TH Köln. En este contexto, también se discuten los déficits todavía existentes en la didáctica de la traducción y las implicaciones para superarlos, a fin de poder preparar a los futuros traductores adecuadamente a un mercado laboral cada vez más complejo y exigente.

  7. Aeolus or Pluton?; Eole ou pluton?

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2003-07-01

    In the next years the french government will have to take great decisions in matter of energy and specifically electric power. This report aims to give an estimation of wind power channel in France supposing financial possibilities equivalent to those implemented for the EPR (European Pressurized Reactor) channel. After a presentation of the electric power industry in France, the two channels are compared. (A.L.B.)

  8. Multiple magmatic pulses of the Eastern Volcano-Plutonic Complex, Krušné hory/ Erzgebirge batholith, and their phosphorus contents

    Czech Academy of Sciences Publication Activity Database

    Štemprok, M.; Holub, F. V.; Novák, Jiří Karel

    2003-01-01

    Roč. 78, č. 3 (2003), s. 277-296 ISSN 1214-1119 R&D Projects: GA ČR GA205/95/0149 Grant - others:GA UK(CZ) 165/1998 Institutional research plan: CEZ:AV0Z3013912 Keywords : volcano-plutonic complex * phosphorus * Krušné hory Mts. batholith Subject RIV: DB - Geology ; Mineralogy http://www.geology.cz/bulletin/contents/2003/vol78no3/bulgeosci200303277.pdf

  9. LA ESTRATEGIA DE CITICORP EN CHILE. Capitulo 3. EL MERCADO FINANCIERO CHILENO

    OpenAIRE

    Fernando Rubio

    2004-01-01

    Esta es la tercera parte de una serie que forman una investigación más amplia titulada “La Estrategia de Citicorp en Chile: Un Intento de Investigación”. Aquí se describe la naturaleza, reglamentación, estado actual y perspectivas de más de los 25 segmentos del mercado financiero chileno, desde la banca hasta las administradoras de fondos de pensiones.

  10. Estrutura de mercado e desempenho na indústria brasileira de bens de consumo

    OpenAIRE

    Figueiredo, Orlando

    1982-01-01

    Inúmeros estudos têm sido realizados em outros países, particularmente os Estados Unidos e Reino Unido, sobre as relações entre características estruturais e comportamentais de setores industriais e seu desempenho econômico. O objetivo destes estudos tem sido o de testar uma hipótese teórica referente ao poder de mercado de empresas oligopolísticas.

  11. Persistencia y Relevancia de los Accruals: Evidencias del Mercado de Capitales Brasileño

    Directory of Open Access Journals (Sweden)

    Augusto Cezar da Cunha e Silva Filho

    2013-01-01

    Full Text Available Este trabajo tiene como objetivo principal analizar la persistencia y la relevancia de los accruals , así como la existencia de la anomalía de los accruals en el mercado de capitales brasileño. Para eso, el presente estudio es conducido por tres hipótesis de pesquisa: (i los accruals son menos persistentes que los flujos de caja en la explicación de los lucros futuros; (ii el mercado no reconoce correctamente las informaciones contenidas en los accruals ; y (iii es posible obtener retornos extraordinarios, tomando como estrategia de inversión la magnitud de los niveles de accruals . La muestra fue compuesta por todas las empresas no financieras, con acciones negociadas en la Bolsa de Valores de São Paulo (BMF&BOVESPA, en el período del 1 de enero de 1995 al 31 de diciembre de 2011. Los resultados indicaron que el coeficiente estimado de la persistencia de los accruals se presentó menor que el coeficiente del flujo de caja, sustentando, así, la primera hipótesis de pesquisa. En la segunda parte de la pesquisa, fue constatado que el mercado aprecia correctamente el componente accruals del lucro, una vez que hay una relación positiva y estadísticamente significativa entre los accruals y los retornos futuros de las acciones, lo que no era esperado. Por fin, los resultados encontrados en la tercera hipótesis sustentan la no existencia de la anomalía de los accruals en el mercado brasileño, pues las carteras de hedge fueron positivas en solamente cinco de los 15 años investigados. Los resultados obtenidos en este trabajo pueden fomentar el establecimiento de políticas para disminución de la asimetría informacional, imposibilitando la transferencia indebida de riqueza para empresas con baja calidad de los lucros.

  12. El efecto fin de mes en los principales mercados accionarios latinoamericanos

    Directory of Open Access Journals (Sweden)

    Werner Kristjanpoller Rodríguez

    2015-01-01

    Full Text Available En los mercados accionarios es frecuente encontrar anomalías de calendario, las cuales han sido objeto de diversos estudios en estas últimas décadas, incluso demostrándose que algunas de ellas a través del tiempo han ido desapareciendo. En este contexto, este artículo analiza una de estas anomalías, el efecto fin de mes, tanto en rendimiento como en volatilidad en los mercados accionarios de seis países latinoamericanos; a saber, Brasil, México, Chile, Colombia, Perú y Argentina en el periodo 1993-2011. La importancia de este estudio radica en poder probar si el efecto de fin de mes ha ido desapareciendo o aún persiste, ya que algunos efectos calendario en mercados accionarios desarrollados se han ido disipando. Los hallazgos de esta investigación, que se realizó de acuerdo con los tres periodos diferentes definidos en la literatura para analizar el impacto fin de mes, muestran que la mayoría de los países bajo análisis obtienen rendimientos anormales positivos en los días asociados al cambio de mes y también muestran anomalías en la volatilidad. Esta investigación no solamente analiza los índices característicos de cada mercado, sino que también las acciones en particular de cada uno, dotándolo de una muestra mucho mayor y exigente al momento de concluir sobre la existencia del fenómeno. También se incluye un análisis de volumen de transacción para verificar ciertas hipótesis del fenómeno asociadas a mayor flujo de efectivo.

  13. La industria musical colombiana en el mercado de los nuevos usos digitales

    Directory of Open Access Journals (Sweden)

    Juan Carlos Monroy Rodríguez

    2006-01-01

    Full Text Available Este artículo pone de presente una realidad que está transformando el mercado de la industria fonográfica, discográfica y cinematográfica. En efecto, hoy en día esta industria ha perdido competitividad en un mercado donde es más económico descargar archivos de música de Internet y fijarlos a través de quemadores en soportes físicos o fijarlos en formatos de comprensión digital (MP3, que comprar los soportes físicos que pagan derechos de autor. Con este panorama actual, el artículo propone alternativas para hacer viable un mercado legal de la música y el cine a través de usos digitales, con soluciones como el uso de ringtones y master tones como una de las posibilidades para poner obras musicales a disposición del público a través de usos digitales y así mismo buscar que los titulares de estos derechos puedan obtener un lucro. De otro lado, también se propone la opción de eliminar los soportes o medios físicos y hacer accesibles al público las obras a través de medios digitales, como un downloading oneroso, que requerirá la adopción de medidas tecnológicas que disuadan el downloading gratuito. Finalmente, el artículo rescata la labor que han realizado las sociedades de gestión colectiva en Colombia buscando poner acorde con el mercado a los autores y a los titulares de derechos conexos.

  14. Impresionismo y mercado: la oficialización de un movimiento rechazado

    OpenAIRE

    González Díaz, Cora

    2016-01-01

    [ES]El objetivo principal de este trabajo es la realización del estudio de las nuevas vías abiertas por el Impresionismo en el mercado del arte. Para ello se analizarán factores tan importantes como el gusto , marcado por las pautas de la Academia francesa, el papel de la mujer dentros de las artes y el grupo impresionista, y el papel fundamental de los marchantes y coleccionistas.

  15. O MARKETING ORIENTADO PELO MERCADO [doi: 10.5329/RECADM.20050402010

    Directory of Open Access Journals (Sweden)

    Sandro Deretti

    2005-11-01

    Full Text Available Normal 0 21 false false false PT-BR X-NONE X-NONE MicrosoftInternetExplorer4 Resumo A economia globalizada determinou alterações profundas no processo estratégico das empresas, propiciando oportunidades e ameaças em todos os segmentos e exigindo produtos e serviços competitivos. Assim, diante deste cenário extremamente desafiador, a função marketing dentro das empresas assume maior importância no desenvolvimento de vantagens competitivas sustentáveis e na redução das incertezas. Muitos autores consideram que a orientação para o mercado seja a essência da filosofia empresarial que leva ao sucesso nesta luta pelos mercados porque investiga desejos e necessidades do consumidor. Este artigo faz uma contextualização dos principais trabalhos que colaboraram para a estruturação do conceito de marketing e da orientação para o mercado.   Palavras-chave: conceito de marketing; estratégia de marketing; orientação para o mercado.   Abstract The global economy determined deep changes in the companies’ strategic process, providing opportunities and threats in all segments and demanding competitive products and services. Therefore, the marketing function in the organizations takes greater importance in the development of sustainable competitive advantages. Many authors consider the market orientation as the essence of the business philosophy that leads to the success in the fight for markets because it investigates the consumer’s desires and necessities. This article analyzes the main works that contribute for construction of marketing concept and market orientation.   Key Words: marketing concept; marketing strategy; market orientation.

  16. El mercado transfronterizo de servicios de salud privados entre Tijuana, México y San Diego, EE. UU.

    OpenAIRE

    Vargas-Hernández, José G.

    2005-01-01

    En este trabajo se analiza el impacto del comercio transfronterizo en los servicios de salud de Tijuana en el mercado hispano – mexicano e inclusive de otros hispanos latinoamericanos de California. Los hispanos – estadounidenses son de origen mexicano cuyas ligas culturales y familiares los mantienen regresando periódicamente a los pueblos mexicanos de donde son originarios. Los hispanos de California constituyen un mercado que se disputan las compañías aseguradoras. El turismo de hispanos q...

  17. Titulación de la propiedad y mercado de tierras

    Directory of Open Access Journals (Sweden)

    Julio Calderón Cockburn

    2011-05-01

    Full Text Available Este estudio analiza la relación entre la tenencia de títulos de propiedad (registrados y los mercados inmobiliarios en zonas de la ciudad que tuvieron un origen informal y/o ilegal. Al hacerlo plantea cuestionamientos a los presupuestos internacionales y encuentra paradojas en el funcionamiento del mercado de suelo popular. La metodología es cuantitativa y cualitativa. Las conclusiones muestran que en asentamientos no consolidados la tenencia de un título de propiedad contribuye a un mayor valor de los predios con relación a aquellos no titulados. No obstante, el título de propiedad no necesariamente está induciendo al predominio de mercados inmobiliarios formales, sino que más bien se mantienen las tendencias que apuntan a las transacciones informales en cuanto a alquileres, compras y ventas.This study analyzes the relationship between recorded land titles and real estate markets in areas of Lima, Peru, that were settled informally and/or illegally. It uses both quantitative and qualitative methodologies. It shows that, in settlements in the process of consolidation, titled land has higher market value than land without a title. However, the existence of a recorded title does not necessarily contribute to the predominance of formal real estate market transactions; in fact, the trend of informal transactions in rentals, purchases and sales persists.

  18. Un Análisis de las Variaciones de Precios Diarias en el Mercado de Liniers

    Directory of Open Access Journals (Sweden)

    Gustavo Rossini

    2007-12-01

    Full Text Available A pesar de la importancia como mercado de referencia para la ganadería vacuna argentina, pocos estudios han examinado el comportamiento de las variaciones de los precios diarios en las categorías comercializadas en el Mercado de Liniers. Dado esto, el objetivo de este trabajo es aportar información sobre la incidencia de variables seleccionadas sobre los cambios en los precios diarios en este mercado en las categorías de mayor ingreso diario. Para ello, un Modelo Logístico Multinomial es usado para predecir la incidencia de dichas variables sobre los cambios en las probabilidades de suba, baja o igualdad de los precios promedios con respecto al día hábil anterior. Los resultados evidencias qeu los días de la semana, los niveles de concentración de los compradores, la variación del número de cabezas y el comportamiento de la plaza el día hábil anterior son importantes en la predicción de las variaciones de precios diarias. Implicancias de los resultados, como así también algunas de las limitaciones del modelo son analizadas.

  19. La imagen del turismo cultural en Cuba percibida por el mercado español

    Directory of Open Access Journals (Sweden)

    Yamilé Pérez Guilarte

    2015-06-01

    Full Text Available El turismo cultural, percibido no solo como las visitas a sitios y monumentos históricos, sino ampliado al conocimiento de la forma de vida y tradiciones de las poblaciones locales, podría constituir una importante alternativa para Cuba. La presente investigación tiene como objetivos determinar si Cuba es apreciada como un destino cultural desde la perspectiva del mercado español e identificar cuáles son sus elementos distintivos. Por medio de un cuestionario realizado a 400 españoles, se evalúan los dos componentes de la imagen de un destino: el cognitivo y el afectivo. El estudio revela una preferencia por el turismo cultural y señala a la gente, la música, al Centro Histórico de La Habana y el estilo de vida como los elementos distintivos de Cuba. Estos resultados contribuyen a un diseño más efectivo de la promoción turística en el mercado español, aunque se recomienda ampliar el estudio a otros mercados potenciales.

  20. El mercado de la carne de bovino en México, 1970-2011

    Directory of Open Access Journals (Sweden)

    Joaquín Cruz Jiménez

    2014-01-01

    Full Text Available La proteína animal es básica en la dieta de los mexicanos y las fuentes principales son carne de ave, bovina y porcina. En 2011 se consumieron 60 kg/persona de carne; 16.5 kg/persona fue bovino. Para estable- cer y cuantifi car el efecto sobre el mercado mexicano de carne de bovino de sus prin- cipales variables determinantes, se diseñó un modelo econométrico de ecuaciones simultáneas, estimado a través de mínimos cuadrados en dos etapas con información secundaria para el periodo 1970-2011. Se consideró un contexto de economía abierta para el mercado bovino, de costos de pro- ducción crecientes y de pérdida de partici- pación en el mercado nacional. Resultó una oferta inelástica a los cambios del precio al productor y una demanda elástica al precio al consumidor, y el precio de importación de carne y granos inciden sobre la oferta, demanda y el saldo de comercio exterior.

  1. Fecundidade e participação no mercado de trabalho brasileiro

    Directory of Open Access Journals (Sweden)

    Marina Silva Cunha

    2016-08-01

    Full Text Available Este trabalho analisa os determinantes da fecundidade e da participação das mulheres no mercado de trabalho brasileiro. São utilizadas as informações da Pesquisa Nacional por Amostra de Domicílio do IBGE, de 1995 até 2009, e o modelo probit bivariado. Conforme o esperado, observou-se queda da fecundidade e aumento da participação no período estudado, bem como efeito negativo dos salários na probabilidade de fecundidade e positivo na probabilidade de participação no mercado de trabalho. Além disso, outras variáveis de controle incluídas relacionadas às características pessoais, condição na família e local de residência também afetam a fecundidade e a inserção das mulheres. Ademais, verificou-se que, na cauda inferior da distribuição da renda domiciliar, o efeito dos salários na fecundidade é maior, mas, no caso do engajamento no mercado de trabalho, é menor.

  2. Competencia por cantidades en los mercados de arte de México

    Directory of Open Access Journals (Sweden)

    José Carlos Ramírez

    2008-01-01

    Full Text Available El artículo establece un modelo de competencia à la Cournot para determinar los precios, cantidades y poder de mercado de los principales intermediarios del mercado secundario de obras pictóricas en México. La hipótesis base es que esas tres variables dependen críticamente de la diferenciación de productos, costos y variaciones conjeturales que los intermediarios mantienen entre sí. Los resultados de las simulaciones revelan que el modelo propuesto funciona muy bien para explicar el comportamiento de los intermediarios ya que, al introducir el parámetro de diferenciación de productos, se pueden distinguir dos nichos en el mercado secundario: el de piezas únicas o altamente diferenciadas vendidas en las casas de subasta y el de obras comunes o de menor diferenciación canalizadas mediante los dealers y las galerías. Esta identificación permea todos las conclusiones de la investigación.

  3. DETERMINANTES Y EFECTOS DEL DESAJUSTE EDUCATIVO EN EL MERCADO LABORAL ECUATORIANO 2007-2012

    Directory of Open Access Journals (Sweden)

    Héctor Alberto Botello Peñaloza

    2016-10-01

    Full Text Available Se estudian las causas y los efectos del desajuste educativo en el mercado laboral ecuatoriano según los microdatos de la encuesta de empleo desde 2007 a 2012 que implementa un modelo de elección discreta y de capital humano. El artículo es el primer estudio sobre la exploración de este fenómeno en el mercado laboral ecuatoriano, que además hace un análisis temporal del fenómeno, para comprobar su naturaleza estrucutural. El desajuste educativo en el mercado laboral ecuatoriano abarca 35 % de la masa laboral donde la sobreeducación es mayoritaria con 22 % y la infraeducación con 13 %. Existe un rendimiento positivo para los años de sobreeducación y una penalización sobre los salarios en el caso de la infraeducación, además se evidencia que el desajuste disminuye a medida que aumenta el tamaño de la empresa y la experiencia del individuo. Estas conclusiones mostraríanque las iniciativas de los observatorios laborales para egresados son un primer paso para conocer las necesidades de las empresas y las competencias que desarrollan los egresados.

  4. Del mercado al instinto (o de los intereses a las pasiones

    Directory of Open Access Journals (Sweden)

    Ovejero Lucas, Félix

    2000-06-01

    Full Text Available En este ensayo se analizan las explicaciones liberales del orden social. A lo largo de la exposición, Ovejero sugiere la conveniencia de revisar dos posturas centrales del liberalismo que mucho tienen que ver con el planteamiento del ¿problema¿ del orden social y su ¿solución¿ a través del mercado. El ¿problema¿ se basa en la idea insostenible de individuo presocial inherente al liberalismo. En el artículo se exponen algunos argumentos para mostrar por qué razón no tiene sentido la pregunta por el ¿fundamento¿ del contrato social. Se sostiene que la sociabilidad no se puede elegir, como tampoco se elige el lenguaje; es decir, tampoco puede explicarse como un resultado de los intercambios o de la negociación de los individuos en el mercado. También se analizan las alternativas posibles para explicar la existencia del cemento social: el vínculo cívico y el vínculo emocional. El artículo termina con un retorno a las pasiones, entendidas en términos de emociones e instintos, como fundamento central para explicar la forma en que el interés personal y el mercado se conjugan para garantizar el orden social.

  5. Mercado metropolitano de trabajo y desigualdades sociales en el Gran Santiago: ¿Una ciudad dual?

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    Carlos A. de Mattos

    2002-12-01

    Full Text Available Los cambios estructurales en los mercados metropolitanos de trabajo bajo los procesos de reestructuración-informacionalización-globalización, se han situado como un tema central para el estudio de la transformación de las ciudades durante las últimas décadas. Desde esta perspectiva, el presente trabajo analiza los impactos que los procesos de modernización capitalista en Chile han tenido sobre su mercado de trabajo y sobre la evolución de la distribución del ingreso, y sobre esta base, observa sus efectos sobre la estructuración socio-territorial del Gran Santiago, discutiendo especialmente la pertinencia de la tesis de la dualización para este caso particular. Para ello, en una primera parte se esbozan los rasgos fundamentales de esta tesis, se analizan los fundamentos con los que ha sido presentada y las causas que se le atribuyen. En la segunda parte se revisan las principales transformaciones producidas en esta fase de modernización capitalista en Chile, y la evolución de las desigualdades sociales y la segregación urbana en el Gran Santiago a la luz de las transformaciones producidas en su mercado de trabajo. En la tercera y última parte, se plantea la discusión sobre la aplicabilidad de la tesis de la dualización al caso chileno

  6. Sm-Nd, Rb-Sr and K-Ar age constraints of the El Molle and Barroso plutons, western Sierra de San Luis, Argentina

    International Nuclear Information System (INIS)

    Sato, A.M.; Gonzalez, P.D; Petronilho, L.A; Llambias, E.J.; Varela, R; Basei, M.A.S

    2001-01-01

    Within the Early Paleozoic Famatinian orogeny of Southern Sierras Pampeanas (Sierra de San Luis and Sierra de Cordoba), the post-orogenic granitoids are characterized by circular intrusions. The published Rb-Sr and K-Ar ages from plutons in the Sierra de San Luis range between 408 and 320 Ma (see synthesis in Llambias et al., 1998). The El Molle and Barroso plutons (Sims et al., 1997; Gonzalez and Sato, 2000) are the two main exposures of a post-orogenic intrusive complex located in the western area of the Sierra de San Luis basement. They also exhibit an overall circular map view of almost 8 km in diameter, and are emplaced in a metamorphic complex developed through pre-Famatinian (Proterozoic? to Early Paleozoic) to Famatinian (Early Paleozoic) orogenies (Gonzalez and Llambias, 1998; von Gosen and Prozzi, 1998). We are carrying out isotopic datings of the El Molle and Barroso plutons in order to contribute to the understanding of the magmatic and metamorphic evolution of the final stages of the Famatinian orogenic cycle in the Sierra de San Luis. The first results of the Sm-Nd, Rb-Sr and K-Ar dates are here presented (au)

  7. Neutron activation and other analytical data for plutonic rocks from North America and Africa. National Uranium Resource Evaluation

    International Nuclear Information System (INIS)

    Price, V.; Fay, W.M.; Cook, J.R.

    1982-09-01

    The objective of this report is to retrieve the elements of an analytical study of granites and associated other plutonic rocks which was begun as a part of the U.S. Department of Energy's National Uranium Resource Evaluation (NURE) program. A discussion of the Savannah River Laboratory (SRL) neutron activation analysis system is given so that a user will understand the linmitations of the data. Enough information is given so that an experienced geochemist can clean up the data set to the extent required by any project. The data are generally good as they are presented. It is intended that the data be read from a magnetic tape written to accompany this report. Microfiche tables of the data follow the text. These tables were prepared from data on the tape, and programs which will read the tape are presented in the section THE DATA TAPE. It is our intent to write a later paper which will include a thoroughly scrubbed data set and a technical discussion of results of the study. 1 figure

  8. Late Variscan, Permo-Carboniferous, Al-K plutonism in the South Portuguese Zone: El Crispinejo cordierite-bearing granite

    Energy Technology Data Exchange (ETDEWEB)

    Díez Montes, A.; Valverde-Vaquero, P.; Rey-Moral, C.; Sánchez García, L.

    2017-07-01

    The El Crispinejo granite forms part of a small, but distinctive late intrusive suite of cordierite-bearing peraluminous granites in the South Portuguese Zone (SPZ). This granite has the best outcrop relationships of the suite. It cross-cuts different members of the Sierra Norte Batholith of the SPZ and the Carboniferous Volcano-Sedimentary Complex of the Iberian Pyrite Belt, producing contact metamorphism. This late pluton has a high K content which results in a contrasting geophysical response (K-Th-U) with respect to the surrounding trondhjemitic granitoids of the TTG suite of the Sierra Norte Batholith. A concordant monazite-zircon U-Pb ID-TIMS age of 300.5 +0.5/-1.5Ma demonstrates Permo-Carboniferous age for this late Variscan magmatic event. The granite is associated with a series of ore showings (F-Pb-Zn and Sn-W) which are completely different from the nearby, massive sulphide and manganese ore deposits of the Iberian Pyrite Belt, indicating the unique character of this intrusion.

  9. The impact of geology on the migration of fluorides in mineral waters of the Bukulja and Brajkovac pluton area, Serbia

    Directory of Open Access Journals (Sweden)

    Papić Petar

    2012-01-01

    Full Text Available One of the hydrogeochemical parameters that classify groundwater as mineral water is the content of fluoride ions. Their concentration is both important and limited for bottled mineral waters. Hydrochemical research of mineral waters in the surrounding area of Bukulja and Brajkovac pluton, in central Serbia, was conducted in order to define the chemical composition and genesis of these waters. They are carbonated waters, with content of fluoride ranging from 0.2 up to 6.6 mg/L. Since hydrochemical analyses showed variations in the major water chemistry, it was obvious that, apart from hydrochemical research, some explorations of the structure of the regional terrain would be inevitable. For these purposes, some additional geological research was performed, creating an adequate basis for the interpretation of the genesis of these carbonated mineral waters. The results confirmed the significance of the application of hydrochemical methods in the research of mineral waters. The work tended to emphasize that “technological treatment” for decreasing the concentration of fluoride in mineral waters occurs in nature, indicating the existence of natural defluoridization. [Projekat Ministarstva nauke Republike Srbije, br. 43004

  10. Rock deformation in hydrothermal systems: the nature of fractures in plutons and their host rocks. Technical progress report

    Energy Technology Data Exchange (ETDEWEB)

    Norton, D.

    1981-11-01

    The purpose of this program is to accumulate the types of field data which are important for the analysis of magma-hydrothermal systems. The structural effects of thermal processes were identified in order to distinguish the thermally induced deformations from the deformations that occurred subsequent to complete cooling of the system. Mapping techniques were developed to record the structural data on the ground from local domains characteristic of larger areas in the magma chamber, and in the air from low-angle oblique aerial photography of the entire region. The ground system is complete and preliminary testing is currently being carried out to verify the method. The results indicate that granitic crystalline rocks have no structural resistance to thermal perturbations. If nuclear wastes are to be stored in granite, precautionary buffers would have to be incorporated into the system. A total of 30 fossil magma chambers have been studied over the past 2 years. An extensive set of fracture imagery has been collected, together with information related to the geological history of the plutons. Fossil magma chambers in Arizona, Utah, California, Washington, Montana, and British Columbia have been studied.

  11. A GEOGRAFIA DO MERCADO MUNDIAL DE PRODUTOS AGROALIMENTARES E O PAPEL DO BRASIL

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    Marlon Clovis Medeiros

    2014-02-01

    Full Text Available O artigo analisa as mudanças recentes na geografia do mercado mundial de produtos agrícolas, discutindo a inserção do Brasil, o papel dos mercados futuros na elevação dos preços internacionais e as mudanças entre os países exportadores e importadores de produtos agrícolas. Argumentamos que a principal mudança no espaço agrícola mundial nas últimas duas décadas foi o crescimento dos investimentos financeiros em commodities agrícolas e o crescimento dos mercados de futuros. A dinâmica financeira se tornou dominante nos mercados agrícolas, levando à mudanças nas safras e nos preços, tornando-os subordinados à expectativa de retorno dos investidores. Este foi o principal elemento da inflação de preços agrícolas em 2006-2008. Estudos dos mais diversos organismos internacionais (FAO, FMI e Banco Mundial apontaram cenários de agravamento da fome em inúmeros países e de continuidade da alta de preços, mas desviaram o foco do papel da especulação, apontando duas grandes causas: a produção de biocombustíveis e o aumento do consumo de alimentos na Ásia. No presente artigo argumentamos pelo contrário, que o papel das vendas antecipadas nas bolsas de mercadorias e futuros, foi o elemento determinante. A oferta e a demanda agrícola vem perderam espaço como reguladores de preços para a antecipação e expectativas dos mercados futuros. Os preços são determinados antes mesmo do plantio. A ampliação dos fluxos internacionais de capital e as crises financeiras trouxeram a dinâmica internacional para o centro dos debates geográficos e sobre os rumos da agricultura.

  12. A PARTICIPAÇÃO DO EMPREENDEDOR QUIXADAENSE NO MERCADO DE CAPITAIS

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    Benedito Almeida Sodré

    2017-08-01

    Full Text Available O Brasil, desde seu descobrimento, teve várias fases no seu desenvolvimento econômico, desde o colonialismo até a atual globalização. Durante estes períodos, sua econômia sofreu várias transformações até chegar a era da industrialização e da tecnologia. Para que estas transformações fossem realizadas foram necessários grandes investimentos, tanto por parte do governo quanto por parte do capital privado das grandes empresas. Para que tais investimentos existissem, se faz necessário uma fonte de recursos que é o mercado de capitais. Este estudo tem como objetivo identificar a participação do investidor quixadaense no referido mercado, bem como seu conhecimento sobre esse mercado e a BM&FBOVESPA (Bolsa de Valores de São Paulo. Para o cumprimento deste estudo foi realizada uma pesquisa de survey, de natureza quantitativa. A coleta de dados ocorreu com aplicação de questionário auto-administrado com perguntas fechadas, de escala Likert de cinco pontos. A pesquisa ocorreu no município de Quixadá – CE, com uma amostra de 15 dos empresários de destaque no setor de indústria e comércio local. Os dados colhidos foram avaliados no Software Excel 2013, e depois de analisados e comentados concluiu-se que a participação do empreendedor quixadaense no mercado de capitais é insignificante com o potencial da indústria e comércio local, bem como o conhecimento dos empreendedores sobre o referido mercado e a BM&FBOVESPA. Para incentivar e melhorar essa participação, seria necessário que fossem efetuados mais divulgações e orientações sobre o tema para melhor esclarecer aos empreendedores.

  13. La transformación de los mercados municipales de Madrid. Análisis legislativo, comercial, y económico de los mercados de abastos madrileños

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    Alejandro Rodríguez Sebastián

    2015-01-01

    Full Text Available ResumenDurante la última década, el Ayuntamiento de Madrid ha desarrollado diferentes políticas con el objetivo de revitalizar los mercados de abastos de la ciudad. Una de ellas ha sido la inserción de cadenas de supermercados junto a las estructuras comerciales tradicionales de los mercados, actuando a modo de "locomotoras’ económicas. Por otro lado, es reconocible la aparición en ciertos mercados de nuevos patrones de consumo, unos asociados a estilos de vida propios de élites y otros surgidos a raíz de las modificaciones realizadas en los mercados. Este trabajo pretende analizar las causas y consecuencias de las diversas transformaciones llevadas a cabo en la red de mercados municipales de Madrid, diferenciando las pautas seguidas en los mercados del centro de la ciudad de los de la periferia.Palabras clave  Mercados municipales, comercio, Madrid, centralidad, periferia, gentrificación comercialAbstractDuring the last decade, Madrid City Council has developed different policies aimed at revitalising the traditional retail markets in the city. One of these has been the insertion of supermarkets next to the traditional commercial structures, acting as economic driving forces. Furthermore, the appearance of new consumption patterns is a remarkable fact, some related to wealthy lifestyles, others arisen due to the changes made in the markets. The aim of this paper is to analyse the causes and consequences of the transformations held in Madrid market network, distinguishing the guidelines followed both in the city centre and in the outskirts.KeywordsTraditional retail markets, trade, Madrid, centrality, suburbs, commercial gentrification

  14. Growth of plutons by incremental emplacement of sheets in crystal-rich host: Evidence from Miocene intrusions of the Colorado River region, Nevada, USA

    Science.gov (United States)

    Miller, C.F.; Furbish, D.J.; Walker, B.A.; Claiborne, L.L.; Koteas, G.C.; Bleick, H.A.; Miller, J.S.

    2011-01-01

    Growing evidence supports the notion that plutons are constructed incrementally, commonly over long periods of time, yet field evidence for the multiple injections that seem to be required is commonly sparse or absent. Timescales of up to several million years, among other arguments, indicate that the dominant volume does not remain largely molten, yet if growing plutons are constructed from rapidly solidifying increments it is unlikely that intrusive contacts would escape notice. A model wherein magma increments are emplaced into melt-bearing but crystal-rich host, rather than either solid or crystal-poor material, provides a plausible explanation for this apparent conundrum. A partially solidified intrusion undoubtedly comprises zones with contrasting melt fraction and therefore strength. Depending on whether these zones behave elastically or ductilely in response to dike emplacement, intruding magma may spread to form sheets by either of two mechanisms. If the melt-bearing host is elastic on the relevant timescale, magma spreads rather than continuing to propagate upward, where it encounters a zone of higher rigidity (higher crystal fraction). Similarly, if the dike at first ascends through rigid, melt-poor material and then encounters a zone that is weak enough (poor enough in crystals) to respond ductilely, the ascending material will also spread because the dike tip ceases to propagate as in rigid material. We propose that ascending magma is thus in essence trapped, by either mechanism, within relatively crystal-poor zones. Contacts will commonly be obscure from the start because the contrast between intruding material (crystal-poorer magma) and host (crystal-richer material) is subtle, and they may be obscured even further by subsequent destabilization of the crystal-melt framework. Field evidence and zircon zoning stratigraphy in plutons of the Colorado River region of southern Nevada support the hypothesis that emplacement of magma replenishments into a

  15. Efeito da crise de 2007/2008 na transmissão internacional de volatilidade no mercado de capitais brasileiro

    Directory of Open Access Journals (Sweden)

    Marcelo Brutti Righi

    Full Text Available Com a crescente globalização, os mercados financeiros do mundo todo passaram a apresentar maior integração. Tal relacionamento entre mercados possui como implicação um termo que vem atraindo a atenção de profissionais e acadêmicos, a transmissão de volatilidade. Dessa forma, o presente trabalho tem como escopo analisar a transmissão internacional de volatilidade no mercado brasileiro. Para tanto, é utilizado um modelo Garch multivariado com parametrização BEKK. Com base nesse modelo, são estimados os relacionamentos bivariados entre o mercado brasileiro, representado pelo índice Ibovespa, e os mercados americano, argentino, mexicano e chinês, utilizando-se de índices representativos de 4 de janeiro de 2000 até 31 de março de 2010, totalizando 2667 cotações. A amostra foi dividida em três partes, representando os períodos anteriores, durante e posteriores à crise do subprime de 2007/2008. Os resultados obtidos permitem concluir que, durante a crise de 2008, de forma geral, houve mudança na direção da transmissão de volatilidade entre o mercado brasileiro e os demais estudados, de forma ao Brasil passar a exercer maior influência na volatilidade condicional desses, por ter sofrido menores consequências com a crise financeira. Além disso, após o período de turbulência causado pela crise de 2008, o relacionamento da volatilidade entre o mercado brasileiro com os demais passou a ser menos assimétrico do que no período anterior a crise.

  16. "Estudio prospectivo de hatos ganaderos, del valle de Ubate, condiciones actuales, limitantes y necesidades de desarrollo para entrar a competir en el mercado internacional"

    OpenAIRE

    Prieto, Juan Antonio; Uribe Aguado, Manuela; Valdivieso Ruiz, Maria Camila

    2011-01-01

    El siguiente trabajo titulado “Estudio Prospectivo de hatos ganaderos, del Valle de Ubate, Condiciones Actuales, Limitantes y Necesidades de Desarrollo Para entrar a Competir en el Mercado Internacional” encontrara un ejercicio prospectivo orientado a establecer posibles escenarios futuros para los ganaderos, productores de leche del Valle de Ubate, a entrar nuevos mercados como el europeo y americano al mercado Colombiano, así mismo propone un análisis de las variables relevantes de las co...

  17. La observancia de los principios integradores del debido proceso en la función disciplinaria adelantada por el autorregulador del Mercado de Valores de Colombia - AMV

    OpenAIRE

    García Cadavid, Jorge Mario; García Cadavid, Rodolfo

    2014-01-01

    Con ocasión de nuestro ejercicio profesional hemos tenido contacto con la autorregulación en el mercado de valores colombiano, concretamente, en cuanto hace al asesoramiento de intermediarios de valores y sus personas naturales vinculadas, respecto de investigaciones de naturaleza disciplinaria adelantadas por el único ente autorregulador de dicho mercado, el denominado Autorregulador del Mercado de Valores de Colombia AMV, en adelante AMV.

  18. Insights into the emplacement of upper-crustal plutons and their relationship to large silicic calderas, from field relationships, geochronology, and zircon trace element geochemistry in the Stillwater - Clan Alpine caldera complex, western Nevada, USA

    Science.gov (United States)

    Colgan, Joseph P.; John, David A.; Henry, Christopher D.; Watts, Kathryn E.

    2018-01-01

    Geologic mapping, new U-Pb zircon ages, and new and published 40Ar/39Ar sanidine ages document the timing and extent of Oligocene magmatism in the southern Stillwater Range and Clan Alpine Mountains of western Nevada, where Miocene extension has exposed at least six nested silicic calderas and underlying granitic plutons to crustal depths locally ≥ 9 km. Both caldera-forming rhyolitic tuffs and underlying plutons were emplaced in two episodes, one from about 30.4-28.2 Ma that included the Deep Canyon, Job Canyon, and Campbell Creek calderas and underlying plutons, and one from about 25.3-24.8 Ma that included the Louderback Mountains, Poco Canyon, and Elevenmile Canyon calderas and underlying plutons. In these two 1-2 m.y. periods, almost the entire Mesozoic upper crust was replaced by Oligocene intrusive and extrusive rocks to depths ≥ 9 km over an estimated total area of 1500 km2 (pre-extension). Zircon trace element geochemistry indicates that some plutonic rock can be solidified residual magma from the tuff eruptions. Most plutons are not solidified residual magma, although they directly underlie calderas and were emplaced along the same structures shortly after to as much as one million years after caldera formation. Magma chambers and plutons grew by floor subsidence accommodated by downward transfer of country rocks. If other Great Basin calderas are similar, the dense concentration of shallowly exposed calderas in central Nevada is underlain by a complexly zoned mid-Cenozoic batholith assembled in discrete pulses that coincided with formation of large silicic calderas up to 2500-5000 km3.

  19. Insights into the emplacement of upper-crustal plutons and their relationship to large silicic calderas, from field relationships, geochronology, and zircon trace element geochemistry in the Stillwater – Clan Alpine caldera complex, western Nevada, USA

    Science.gov (United States)

    Colgan, Joseph P.; John, David A.; Henry, Christopher D.; Watts, Kathryn E.

    2018-01-01

    Geologic mapping, new U-Pb zircon ages, and new and published 40Ar/39Ar sanidine ages document the timing and extent of Oligocene magmatism in the southern Stillwater Range and Clan Alpine Mountains of western Nevada, where Miocene extension has exposed at least six nested silicic calderas and underlying granitic plutons to crustal depths locally ≥ 9 km. Both caldera-forming rhyolitic tuffs and underlying plutons were emplaced in two episodes, one from about 30.4–28.2 Ma that included the Deep Canyon, Job Canyon, and Campbell Creek calderas and underlying plutons, and one from about 25.3–24.8 Ma that included the Louderback Mountains, Poco Canyon, and Elevenmile Canyon calderas and underlying plutons. In these two 1–2 m.y. periods, almost the entire Mesozoic upper crust was replaced by Oligocene intrusive and extrusive rocks to depths ≥ 9 km over an estimated total area of ~ 1500 km2 (pre-extension). Zircon trace element geochemistry indicates that some plutonic rock can be solidified residual magma from the tuff eruptions. Most plutons are not solidified residual magma, although they directly underlie calderas and were emplaced along the same structures shortly after to as much as one million years after caldera formation. Magma chambers and plutons grew by floor subsidence accommodated by downward transfer of country rocks. If other Great Basin calderas are similar, the dense concentration of shallowly exposed calderas in central Nevada is underlain by a complexly zoned mid-Cenozoic batholith assembled in discrete pulses that coincided with formation of large silicic calderas up to 2500–5000 km3.

  20. The role of pegmatites and acid fluids for REE/HFSE mobilization in the Strange Lake peralkaline granitic pluton, Canada

    Science.gov (United States)

    Gysi, A. P.; Williams-Jones, A.

    2012-12-01

    The Strange Lake pluton in Canada is a mid-Proterozoic peralkaline granitic intrusion that is host to a world-class rare earth element (REE), yttrium (Y) and high-field strength element (HFSE) deposit containing more than 50 Mt ore at >1.5 wt.% REE and >3 wt.% Zr. The highest REE/HFSE concentrations are found in pegmatite-rich zones characterized by intense alteration. Previous studies of Strange Lake and other peralkaline and alkaline intrusions, such as Khan Bogd (Mongolia) and Tamazeght (Morocco) plutons have shown that hydrothermal alteration may play an important role in the mobility of the REE/HFSE. However, the fluid chemistry and conditions of alteration (i.e., P, T, pH, fO2, ligand activity) in these systems still need to be constrained to evaluate the importance and scale of such hydrothermal mobilization. We present new data from the B-zone, a pegmatite-rich zone located in NW Strange Lake. The pegmatites are generally zoned and form two main types. The border-type pegmatites consist of quartz, K-feldspar and hematized aegirine, whereas volatile-rich pegmatites consist of hydrothermal quartz and fluorite. Transitions between both types were also observed, with the K-feldspar being partly altered and replaced by Al-Si-rich phyllosilicates. The heavy (H)REE and Zr were primarily concentrated in zirconosilicates such as elpidite, now pseudomorphed by zircon or gittinsite, whereas light (L)REE and Y were concentrated in REE-F-(CO2)-minerals such as fluocerite and bastnäsite. Textural and mineralogical observations indicate that these minerals are primary and were partly to completely leached upon fluid-rock interaction in the pegmatites. Secondary phases include Ca-F-Y-rich minerals, mainly hydrothermal fluorite, that fill vugs and replaced primary REEHFSE minerals. The presence of hydrothermal fluorite veins, micro-veins, vugs and micro-breccia in the most altered parts of the B-zone are interpreted to reflect interaction of the rocks with a F-rich fluid

  1. Petrology, Magnetic susceptibility, Tectonic setting and mineralization associated with Plutonic and Volcanic Rocks, Eastern Bajestan and Taherabad, Iran

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    Malihe Ghoorchi

    2009-09-01

    Full Text Available Study area is located in district of Bajestan and Ferdows cities, NE of Iran. Structurally, this area is part of Lut block. The oldest exposed rocks, to the north of intrusive rocks and in Eastern Bajestan, are meta-chert, slate, quartzite, thin-bedded crystalline limestone and meta-argillite. The sedimentary units are: Sardar Formation (Carboniferous, Jamal Formation (Permian, Sorkh Shale and Shotori Formations (Triassic, carbonateous rocks (Cretaceous and lithostratigraphically equivalent to Kerman conglomerate (Cretaceous-Paleocene are exposed in this area. Based on relative age, magmatism in eastern Bajestan and Taherabad started after Late Cretaceous and it has been active and repeated during Tertiary time. At least, three episodes of volcanic activities are recognized in this area. The first stage was mainly volcanic flow with mafic composition and minor intermediate. The second episode was mainly intermediate in composition. The third stage was changed to acid-intermediate in composition. Since the plutonic rocks intruded the volcanic rocks, therefore they may be Oligo-Miocene age. Bajestan intrusive rocks are granite-granodiorite-quartz monzonite. Taherabad intrusive rocks are diorite-quartz diorite- monzonite-latite. Bajestan intrusive rocks are reduced type (ilmenite series and Taherabad intrusive rocks are oxidized type (magnetite series.Based on geochemical analysis including trace elements, REE and isotopic data, Bajestan intrusive rocks formed in continental collision zone and the magma has crustal origin. Taherabad intrusive rocks were formed in subduction zone and magma originated from oceanic crust. Taherabad intrusive rock has exploration potential for Cu-Au and pb.

  2. Mercados eficientes e arbitragem: um estudo sob o enfoque das finanças comportamentais

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    Tarcísio Saraiva Rabelo Junior

    2004-04-01

    Full Text Available A Hipótese dos Mercados Eficientes (HME tem se mostrado uma das mais influentes teorias no campo das finanças, sendo base para inúmeros modelos de precificação de ativos, com aplicações que vão desde modelos tradicionais utilizados em Finanças Corporativas até avançadas teorias utilizadas na identificação do preço "justo" de derivativos financeiros. Um dos pilares da HME é a possibilidade da arbitragem como mecanismo de correção de possíveis desvios que o mercado possa sofrer de sua forma eficiente.Pela teoria clássica dos mercados eficientes, mesmo em um ambiente caracterizado pela presença de alguns investidores não totalmente racionais, a possibilidade de arbitragem anularia o efeito destes nos preços dos ativos negociados, trazendo-os de volta ao seu valor fundamental. Um campo relativamente novo e de crescente importância das finanças, denominado Finanças Comportamentais, tem mostrado, entretanto, que nos mercados reais a possibilidade de arbitragem é, muitas vezes, custosa e não passível de realização, comprometendo sua utilização como ferramenta reguladora do mercado e, até mesmo, a definição clássica de sua eficiência, que é a de refletir corretamente nos preços as informações existentes sobre os ativos financeiros. Este trabalho aborda a importância da arbitragem para a HME, discutindo seus aspectos teóricos. Posteriormente, são levantados, através de uma abordagem derivada das Finanças Comportamentais, os principais problemas existentes quanto à sua efetiva utilização nos mercados reais e as conseqüências destes para a HME.The Efficient Market Hypothesis (EMH has revealed to be one of the most influential theories in finance and constitutes the basis for countless asset pricing models. Its applications range from traditional Corporate Finance models to advanced theories, used to identify the just price of financial derivatives. One of the EMH pillars is the possibility of arbitration

  3. ANÁLISE DE MERCADO COMO FERRAMENTA PARA O TERCEIRO SETOR

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    Grazielle Rigotti da Silva

    2012-04-01

    Full Text Available O foco dessa pesquisa consiste em identificar, através do estudo de caso, como o processo de Análise de Mercado como ferramenta de escolha de canal de marketing, pode ser um instrumento estratégico também adequado para o êxito no desenvolvimento profissional de instituições do terceiro setor, particularmente àquelas voltadas à área educacional, tratadas especialmente aqui.  Sendo assim, partindo de uma minuciosa pesquisa de mercado em quatro cidades onde atua a Sagrado: Rede de educação, relacionando os temas Marketing, Sustentabilidade e técnicas de Análise de Mercado, e concluindo com o método da Pontuação Ponderada como facilitador da visualização e tomada de decisão, vislumbra-se que as conclusões alcançadas possam auxiliar no planejamento não só da organização apresentada, encontrando soluções que visem a superação dos obstáculos e dificuldades encontradas, mas que seja um impulso a todas as quais se revelam semelhantes à apontada. Parte-se da realidade de que entre os principais obstáculos ao desenvolvimento destas instituições, destacam-se: a carga histórica ligada à pura filantropia, a gerência por intuição, o desconhecimento de técnicas administrativas e a sobrecarga de trabalhos exercida pelos dirigentes, focados mais em atividades fins, do dia-a-dia da empresa. Estes, entre outros fatores, acabam por ocasionar uma elevada taxa de falência entre estas organizações.

  4. JOVENS NO MERCADO DE TRABALHO FORMAL BRASILEIRO: UMA ANÁLISE QUANTITATIVA

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    LUÍS ABEL DA SILVA FILHO

    2015-01-01

    Full Text Available En la década de 1990, la alta tasa de desempleo era parte de la realidad del mercado laboral bra - sileño. En este escenario, la mano de obra juvenil fue la más penalizada al tener las tasas más bajas de empleo, con la mayoría de ocupados en el sector informal y la obtención de ingresos bajos. Sin embargo, durante la primera década de este siglo, la dinámica del mercado laboral nacional fue distinta de la observada en la última década, sobre todo desde 2004, con el aumento en la creación de puestos de trabajo formales. Por lo tanto, el presente artículo tiene como objetivo analizar el mer - cado de trabajo de menores y jóvenes (en edades entre 14 y 24 años. El marco de tiempo de este análisis cubre los años 1992, 2002 y 2012; los datos corresponden a la Información Social Anual (RAIS, del Ministerio de Trabajo y Empleo (MTE. Metodológicamente se realizó una revisión de la literatura relativa a la inserción de los jóvenes en las actividades de trabajo, y se calculó un indicador para la estimación de la participación de los jóvenes ocupados formalmente en Brasil. Los princi - pales resultados muestran que entre 1990 y 2000 se dio un empeoramiento de la entrada de los jóvenes en el mercado de trabajo brasileño. Además, se encontró que la formalización promovida durante la década del 2000, no alcanzó a la mano de obra formal de jóvenes.

  5. Instituições e a informalidade no mercado de trabalho

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    Gabriel Ulyssea

    2008-09-01

    Full Text Available O objetivo deste artigo é desenvolver um modelo que concilie os principais aspectos institucionais relativos à informalidade no mercado de trabalho. Trata-se de um modelo de matching com dois setores, formal e informal, que incorpora os principais tradeoffs que firmas e trabalhadores enfrentam ao decidir em que setor ingressar. O modelo apresenta uma inovação que o torna mais coerente aos principais fatos estilizados e às evidências empíricas mais recentes. Os resultados das simulações de políticas mostram que elevações no seguro-desemprego e reduções no imposto sobre a folha geram impactos positivos, porém reduzidos, sobre os principais indicadores do mercado de trabalho. Ao contrário, uma intensificação da fiscalização governamental leva a significativas reduções da informalidade, mas também provoca uma elevação substancial da taxa de desemprego e uma piora em outros indicadores do mercado de trabalho brasileiro.This paper aims to develop a model capable of reconciling some of the main institutional aspects relative to labor market informality. It is a two-sector, formal and informal, matching model that incorporates the main tradeoffs faced by workers and firms when deciding in which sector they will operate. The model presents an innovation that makes it more coherent with most stylized facts and recent empirical evidence. Policy simulation's results show that increasing unemployment benefits and reducing payroll taxes generate positive, although small effects over labor market indicators. However, intensifying government audition rates implies a substantial reduction of informality rates, but it also causes unemployment to increase and the deterioration of other important indicators in the Brazilian labor market.

  6. Influência do capital social no mercado de crédito rural

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    Roberto Arruda de Souza Lima

    2005-03-01

    Full Text Available O trabalho analisa o efeito do capital social sobre o volume de negócios no mercado de crédito rural. No caso do crédito rural, o intermediário financeiro maximizador de lucro depara com uma importante restrição a este objetivo: historicamente, a taxa de juros nesse mercado tem sido fixada, pelo governo, abaixo do equilíbrio de mercado. Assim, o problema relevante para o intermediário financeiro é a minimização do seu custo. A hipótese, que foi verificada econometricamente (utilizando, para isso, um modelo de lógite, é que, ao contribuir para a redução dos custos transacionais, o nível de capital social afeta o volume de crédito rural. Assim, incentivos, em especial com apoio do setor público, para formação e manutenção de capital social permitiriam aumento da eficiência da intermediação financeira e, em conseqüência, maior desenvolvimento do setor rural.This study analyses the effect of social capital on the volume of contracts in the rural credit market. It discusses how social capital contributes to the reduction of financial intermediation's transaction costs. A logit regression model was used to empirically test the effect of social capital on the volume of rural credit. The results indicate that the level of social capital affects the amount of rural credit. Thus, incentives to further increase and maintain social capital would increment the efficiency of financial intermediation and, as a consequence, help the rural sector's development.

  7. Riqueza, uso y origen de plantas medicinales expendidas en los mercados de la ciudad del Cusco

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    Isau Huamantupa

    2012-02-01

    Full Text Available Se estudiaron las plantas medicinales expendidas en cinco mercados principales de la ciudad del Cusco: San Pedro, San Jerónimo, TTio, Wanchaq y Rosaspata y cuatro zonales de San Sebastián, Molino II, Huancaro y Santa Rosa. Se realizaron encuestas y colectas para identificar las especies de plantas medicinales, modo de utilización, afecciones tratadas, lugar de procedencia y origen. Registramos 152 especies, con 45 familias, las más ricas en especies fueron: Asteraceae con 36 y Lamiaceae (12; las especies con la mayor frecuencia de venta y compra fueron: Muehlenbeckia volcanica (Benth. Endl. “mullaca”, Perezia virens (D. Don Hook. & Arn. “valeriana”, Matricaria recutita L. “manzanilla” e Hypochaeris taraxacoides (Walp. B. & H. “pilli pilli”; el hábito herbáceo represento el 75% del total; de las partes utilizadas 81% corresponden a toda la planta; las infusiones o “mates calientes” abarcaron el 69% del modo de preparación y las afecciones tratadas con mayor frecuencia fueron las inflamaciones renales y hepáticas, dolencias gastrointestinales y afecciones broncopulmonares. Las especies nativas representaron el 83% del total, de estas 78%, son procedentes de la región andina principalmente de localidades aledañas al departamento Cusco. Consideramos que esta alta riqueza de plantas medicinales expendidas en los mercados de la ciudad del Cusco es similar a otros registros en mercados andinos importantes de Sudamérica como en Bolivia y Ecuador, las que a su vez están arraigadas a conocimientos ancestrales, principalmente de la cultura Quechua.

  8. Análise do armazenamento de milho no Brasil em um mercado de economia aberta

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    Vania Di Addario Guimarães

    2006-12-01

    Full Text Available O estudo desenvolve um modelo dinâmico de expectativas racionais para analisar o mercado de milho no Brasil no final da década de 1990, no qual o governo intervém com uma política de subsídio ao produtor, através do Prêmio para Escoamento de Produto (PEP e considerando ainda o comércio internacional. O modelo é estimado através de programação dinâmica estocástica. Os resultados mostram que a abertura do mercado transfere para o comércio exterior o papel de amortecedor de choques de oferta e demanda internos que, no caso de mercados fechados, é desempenhado pelos estoques entre anos safra. Os resultados sugerem que, dependendo dos valores relativos entre o preço mínimo e o preço de exportação, a política de subsídio pode levar o país à condição de exportador, às custas de gastos crescentes para o governo.A dynamic rational expectation storage models was developed to represent the Brazilian corn market in the late 90’s. In theses years the Brazilian agricultural price policy changed from a buffer stock scheme to a producer price subsidy (Prêmio para Escoamento de Produto - PEP and the Brazilian market was open to international trade. The model was estimated through stochastic dynamic programming. The results show that with open markets, exports and imports play the role of shocks absorbers, played by storage in closed economies. Results suggest that the producer price subsidy policy may lead the country to be an exporter, depending on the relative values between minimum price and export price at the cost of ever increasing government expenditures.

  9. Crecimiento económico y desarrollo del mercado de capitales en México

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    Osmar Hazael Zavaleta Vázquez

    2015-12-01

    Full Text Available Diversos autores afirman que el desarrollo del sistema financiero, en general, y de los mercados financieros, en particular, dependen del desarrollo económico del país, ya que como consecuencia del crecimiento de la economía real aumentarán las necesidades de servicios financieros y de financiación de proyectos productivos. Existe otra corriente a través de la que se establece que el crecimiento de la economía real depende, en parte, del desarrollo del sistema financiero. El objetivo de este trabajo es estimar un modelo econométrico estructural para analizar la influencia del desempeño del mercado de capitales sobre el crecimiento de la economía mexicana, teniendo en cuenta los principales determinantes del crecimiento de la economía real. Se considera el horizonte temporal comprendido entre abril de 2000 y agosto de 2010, y se obtiene que el desempeño del mercado de capitales de México tiene un peso similar en el crecimiento de la economía nacional al que tiene la disminución en la tasa de desempleo y es prácticamente tres veces mayor al que ejercen las remesas en el crecimiento económico real. Además, su impacto es considerablemente mayor al que tiene la inversión en ciencia y tecnología y al que tiene la balanza comercial.

  10. O MODELO DE GREENBLATT: EVIDÊNCIAS NO MERCADO DE AÇÕES BRASILEIRO ENTRE 2002 E 2012

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    Ricardo dos Santos Dias

    2015-08-01

    Full Text Available A dinâmica e a competitividade do mercado de capitais exigem uma velocidade de resposta ótima e um nível de conhecimento por parte do investidor, que muitas vezes o impede de decidir em tempo hábil. O presente artigo tem por objetivo analisar a eficiência dos fundamentos contidos no modelo proposto por Greenblatt (2007 no mercado de ações brasileiro, avaliando se a simplicidade da análise proposta possibilita resultados sustentáveis. Como forma de comparação foi utilizado o resultado gerado pelo portfólio proposto, no período de 2002 a 2012, com índices de mercado. O resultado acumulado da carteira foi superior a 310%, quase duas vezes superior ao maior rendimento apurado dentre os índices comparativos. Um teste de diferença de médias permitiu inferir que os resultados do modelo proposto por Greenblatt (2007 podem gerar retornos estatisticamente diferentes da média do mercado. Palavras-chave: Mercado de capitais. Investimentos. Ações.

  11. Flores de corte y follaje en florerías y mercados de Puebla, México

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    C. Tlahuextl-Tlaxcalteca

    2005-01-01

    Full Text Available Puebla, México, la capital del estado, es un consumidor importante de especies de flor de corte y follaje. Se elaboró un cuestionario el cual se aplicó a través de entrevistas con los dueños de florerías o encargados de ventas en seis mercados y 40 florerías. Las florerías de Puebla ofrecen más especies de flores de corte que los mercados. Los precios de flores en los mercados son más bajos, pero la calidad también es menor que en las florerías. Los mercados ofrecen varias especies de flores de corte provenientes de la producción a la intemperie (Celosia cristata, Centaurea cyanus, Gladiolus sp., Matthiola incana, Tagetes erecta. Lo interesante es que tanto las florerías como los mercados tienen amplio surtido de follaje cortado de buena calidad. El objetivo de esta investigación fue obtener información sobre la oferta y demanda de especies de flor de corte y follaje en Puebla. Asimismo, las preferencias de los hombres y las mujeres hacia estos productos

  12. La sensibilidad de los parámetros en el mercado potencial y actual de una organización

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    Francisco Javier Landa Bercebal

    2015-07-01

    Full Text Available El sistema del mercado compuesto por el entorno, las organizaciones en competencia y los consumidores/compradores realizan una interacción permanente que se concreta en una trayectoria dinámica. Si el mercado se divide en mercado actual y mercado potencial, el cambio de los consumidores/compradores del uno al otro o simplemente la entrada al mercado actual de una organización cualquiera suponen también un proceso dinámico que depende de variables exógenas al sistema y del valor de los parámetros de ajuste, cuyo origen está en la manera de comportamiento de los individuos que componen el sistema estudiado. La sensibilidad y el estudio de esos valores de los parámetros requieren conocer la posible tendencia del sistema, así como el comportamiento del mismo, dependiendo de la región paramétrica en la que se encuentre.

  13. Processos globais e mercado de trabalho: novas dinâmicas no setor automotivo no Brasil - anos 2000

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    Garcia, Sandro Ruduit

    2007-01-01

    Full Text Available O artigo tenta identificar novas dinâmicas no mercado de trabalho, face aos processos globais, a partir do que vem ocorrendo no setor automotivo brasileiro nos anos 2000, focando particularmente o caso do pólo de Gravataí (RS. O argumento central da análise é de que a constituição de processos globais promove novas dinâmicas em mercados de trabalho regionais. A abertura de mercados de produtos, as composições entre capitais nacionais e estrangeiros e os investimentos em novas plantas industriais expressam processos globais que poderiam criar novas atividades e funções produtivas, empresas e empregos, assim como estimular capacidades e conhecimentos. Por outro lado, a competitividade, instabilidade e interdependência do sistema global reforçariam a seletividade social nos mercados de trabalho regionais, constituindo novos riscos e ansiedades para segmentos econômicos e sociais vulneráveis. Isso tenderia a mobilizar instituições no esforço de tentar reparar distorções face à nova complexidade do mercado de trabalho

  14. Plan de marketing para el posicionamiento de mercado del Taller Automotriz "Los Turbos".

    OpenAIRE

    Lomas Lomas, Shirley Karina; Riera Cevallos, Jenny Belén

    2015-01-01

    Propuesta de un plan de marketing para mejorar el posicionamiento del taller automotriz “Los Turbos”, a través de la evaluación del comportamiento del cliente y el diseño de estrategias, que permitan al negocio obtener una ventaja competitiva, incrementando la cuota de mercado y las ventas crezcan. Proposal for a marketing plan to improve the positioning of the business "Turbos", through the evaluation of customer behavior and designing strategies that allow the business to obtain a ...

  15. Vida moderna: sensações, espetáculo, mercado, cultura e violências

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    Márcia Barros Ferreira Rodrigues

    2013-12-01

    Full Text Available O artigo propõe conexões entre economia, vida material, imagens e as formas de organização do olhar e seus efeitos em curso na modernidade radicalizada presente na sociedade atual. Particularmente, apresentamos reflexões acerca dos processos alienantes de exclusão social e violências inscritas nas novas formas de subjetivação em curso. Nosso propósito é discutir e analisar as premissas e estratégicas para a formulação de políticas públicas e sociais de inclusão, no universo das sensações, do mercado, do espetáculo e do consumo que caracterizam a vida moderna, sobretudo no que diz respeito à juventude. Palavras-chave: cultura; mercado; subjetividade; juventude e violência. Abstract: this paper proposes connections between economy, material life, images and organization of perception and their effects in nowadays modern societies. Particularly, we introduce reflections about alienating processes of social exclusion and violence entered in the new forms of subjectivity in progress. Our propose is to discuss and to analyze premises and strategies to the formulation of public and social policies of inclusion, in the universe of sensations, spectacle, market and consumption that characterizes the modern life, specially regarded to youth generation. Keywords: culture; market; subjectivity; violence.  Resumen: El artículo propone conexiones entre la economía, la vida material, las imágenes y la organización de percepciones y sus efectos en curso sobre la modernidad radical de nuestra sociedad actual. En particular presentamos reflexiones sobre los procesos alienantes de la exclusión social y la violencia introducidos en las nuevas formas de subjetividad. Nuestro propósito es el de discutir y analizar los supuestos y estrategias para la formulación de políticas públicas y sociais de inclusión, en el universo de sensaciones, mercado, espectáculo y consumo que caracterizan la vida moderna, especialmente en lo referente a

  16. Contaminación enteroparasitaria de lechugas expendidas en mercados del estado Lara. Venezuela

    OpenAIRE

    TRAVIEZO-VALLES, LUIS; DÁVILA, JUAN; RODRÍGUEZ, RICARDO; PERDOMO, OMAIRA; PÉREZ, JOSÉ

    2004-01-01

    Para determinar la contaminación de lechugas con enteroparásitos, se analizaron 100 muestras (50 lechuga americana y 50 lechuga romana) cultivadas en tres lugares distintos, Timotes y Bailadores (estado Mérida) y Chejendé (estado Trujillo) y expendidas en cuatro mercados diferentes del estado Lara: Terepaima, Cabudare, Las Trinitarias y Central. Las lechugas fueron procesadas según la técnica de Álvarez et al, modificada, detectando contaminación en el 29% de las muestras (16 LA y 13 LR) iden...

  17. Perfil de mercado de Alemania, Austria, Bélgica, Bulgaria y Chipre

    OpenAIRE

    López Rodríguez, Maria Alexandra; Martínez Giraldo, Maria Paula; Rosero Cely, Erika Natalia

    2015-01-01

    Es por esto que el objetivo de este proyecto es dar a conocer mediante la investigación del comercio internacional entre Colombia y la Unión Europea, específicamente para los países de Alemania, Austria, Bélgica, Bulgaria y Chipre estrategias de internacionalización y expansión de las PYMES a nuevos mercados. Entonces, con este proyecto se quiere conseguir que por medio de la investigación y la información se determinen aquellos productos y servicios que Colombia está ofreciendo a los país...

  18. A discriminação de mulheres travestis e transexuais no mercado de trabalho

    OpenAIRE

    Licciardi, Norma; Waitmann, Gabriel; Oliveira, Matheus Henrique Marques de

    2015-01-01

    Mulheres travestis e transexuais brasileiras sofrem o desamparo no meio familiar, acadêmico, laboral e social desde o momento em que assumem sua identidade transgênera. Para melhorar essa realidade, cabe olharmos através do viés social dos Recursos Humanos e estudar a inclusão dessas mulheres no mercado formal de trabalho, em contrapartida às estatísticas que reduzem esse contingente populacional à prostituição ou a empregos informais. Por meio de depoimentos colhidos com mulheres transgênera...

  19. Uso tradicional de plantas medicinales en mercados de Bogot?, D.C

    OpenAIRE

    Giraldo Quintero, Sara Emilia; Bernal Lizaraz?, Mar?a Consuelo; Morales Robayo, Adriana; Pardo Lobo, Alesdy Zuled; Gamba Molano, Leopoldo

    2015-01-01

    Objetivo.Describir el uso tradicional de 26 plantas, identificando la droga vegetal, su preparaci?n y administraci?n, los fines medicinales para los que se recomiendan y posibles pr?cticas de uso inadecuado. Materiales y m?todos. Se aplicaron 16 entrevistas semiestructuradas a vendedores de plantas medicinales en 8 plazas de mercado de la ciudad de Bogot?, D.C. Adicionalmente se realiz? la identificaci?n taxon?mica de las plantas con mayor reporte por parte de los vendedores y su uso tradicio...

  20. INVENTARIO DE RECURSOS TURÍSTICOS EDUCATIVOS DEL MERCADO SAN CAMILO. AREQUIPA 2015

    OpenAIRE

    TACCA QUISPE, LORENZO WILBERT

    2016-01-01

    La educación superior, tiene numerosos objetivos, entre los cuales destacan el resolver problemas, satisfacer necesidades o generar nuevos conocimientos; por esta razón se hizo esta investigación, pues creemos firmemente que al realizar un inventario de los recursos turísticos del mercado San Camilo damos a conocer algo novedoso, pues la mayoría de los recursos con los que cuenta este centro de abastos no se conocen. La investigación se hizo tomando como base el instrumento pro...

  1. EXPERIÊNCIA E LUXO: O MERCADO DO SEXO E A GESTÃO EMPRESARIAL.

    OpenAIRE

    Vieira, Daniel Morais

    2015-01-01

    A prostituição existe desde os primórdios da humanidade. No decorrer do tempo, o sexo camuflado pela luxúria encontra nos dias atuais o modelo corporativo. Várias empresas têm desenvolvido seus negócios baseados no entretenimento. Para isso, elas utilizam de estratégias para o incremento mercadológico e segmentação de mercado, apresentando crescimento superior ao de empresas tradicionais. Até mesmo cidades, como Las Vegas e Dubai perceberam o grande potencial econômico que h...

  2. La imagen del turismo cultural en Cuba percibida por el mercado español

    OpenAIRE

    Yamilé Pérez Guilarte

    2015-01-01

    El turismo cultural, percibido no solo como las visitas a sitios y monumentos históricos, sino ampliado al conocimiento de la forma de vida y tradiciones de las poblaciones locales, podría constituir una importante alternativa para Cuba. La presente investigación tiene como objetivos determinar si Cuba es apreciada como un destino cultural desde la perspectiva del mercado español e identificar cuáles son sus elementos distintivos. Por medio de un cuestionario realizado a 400 españoles, se eva...

  3. Programas de fidelización y marketing relacional en mercados de precios

    OpenAIRE

    Vargas, Juan Fernando

    2012-01-01

    La siguiente investigación tiene como finalidad indagar la aplicabilidad de los programas de fidelización y marketing relacional en comerciantes o intermediarios de mercancías, denominados como "mercados de precios" por basar su decisión de compra en la búsqueda acérrima del proveedor con el menor costo posible en los productos que distribuyen y así incrementar al máximo la rentabilidad en cada transacción comercial que realicen. Para determinar si los programas de fidelización son aplicables...

  4. INDÚSTRIAS CRIATIVAS: AS TRANSFORMAÇÕES DO MERCADO MUSICAL

    OpenAIRE

    Silva, Renata Oliveira da; Universidade de São Paulo; Barlach, Lisete

    2016-01-01

    Esta pesquisa pretende mostrar as mudanças na indústria musical entre 2002 e 2013 e como estas afetaram as indústrias criativas. Além disso, quer analisar as atitudes da indústria da música sobre as novas demandas do mercado e gerar ideias para futuros temas de pesquisa sobre o assunto abordado. Para tal, utiliza-se uma metodologia exploratória com o levantamento de dados secundários em uma análise documental de arquivos pertencentes às seguintes instituições: IBGE, ABPD e IFPI.Palavras chave...

  5. La inocuidad alimentaria en el mercado Mexicano de Limón Persa (Citrus latifolia tanaka)

    OpenAIRE

    Herbert Ruiz, Marlene

    2012-01-01

    La globalización comercial exige que los mercados mundiales de productos agroalimentarios observen prácticas de inocuidad en sus productos: libres de contaminantes químicos, biológicos y físicos. En ese contexto, México modificó el 26 de julio de 2007 la Ley Federal de Sanidad Vegetal (LFSV), la cual ahora tiene como objetivo la aplicación, verificación y certificación de los sistemas de reducción de riesgos de contaminación en la producción y empaque de vegetales. El obje...

  6. El mercado de la franquicia española: necesidad de valores culturales

    OpenAIRE

    Ribeiro Soriano, Domingo Enrique; Ribes Pons, Angel

    2000-01-01

    El origen de las franquicias data de principios de siglo y hoy constituyen uno de los principales protagonistas del mercado. Esta fórmula guarda semejanzas con una gran empresa y sus sucursales y para su buen funcionamiento requiere una cultura empresarial común que genere sinergias. A continuación se expone un panorama general de las franquicias realizado en base a la contrastación de datos de una muestra de 288 de las 670 enseñas españolas que se han contabilizado en base a datos propios (1...

  7. Negociación automática en mercados electrónicos

    OpenAIRE

    Salazar Serrudo, Carla

    2008-01-01

    Existen varias etapas al tiempo de comprar productos en aplicaciones de comercio electrónico. La etapa más interesante es el proceso de negociación. Este proceso se considera el momento más importante en la compra y venta de productos, pero también es una tarea muy compleja y que requiere de tiempo y pericia para conseguir un buen precio, tanto del comprador como del vendedor. El presente estudio responde a un objetivo principal, el cual es investigar el mercado electrónico de los negoc...

  8. Paradigmas del mercado financiero rural en países en desarrollo.

    OpenAIRE

    Fuentes Méndez, Luis Alberto; Gutiérrez S., Alejandro

    2007-01-01

    1.- Artículos Tenencia de la tierra y desarrollo rural sostenible: algunos puntos para la reflexión en el caso venezolano. Land tenure and sustained rural development: points for reflecting on the Venezuelan case. Tenure de la terre et développement rural durable : quelques points pour la réflexion dans le cas du Venezuela. Delahaye, Olivier Paradigmas del mercado financiero rural en países en desarrollo. Paradigms in the rural financial markets in developing countries. ...

  9. Elasticidad de la demanda por medicamentos en el mercado farmacéutico privado en Colombia

    OpenAIRE

    Vásquez Velásquez, Johanna; Gómez Portilla, Karoll; Castaño Vélez, Elkin; Cadavid Herrera, José Vicente; Ramírez Hassan, Andrés

    2013-01-01

    Esta investigación estimó la elasticidad de la demanda intramolecular, marca y genérico, para tres patologías trazadoras, hipertensión esencial, diabetes e hiperlipidemia, en el mercado ético y privado colombiano, a partir de una especificación dinámica del modelo AIDS basado en técnicas de cointegración -- La estimación de la elasticidad de la demanda intramolecular permite concluir que tanto medicamentos de marca como genéricos son inelásticos ante cambios en su precio, son bienes de lujo s...

  10. Elasticidad de la demanda por medicamentos en el mercado farmacéutico privado en Colombia

    OpenAIRE

    Vásquez Velásquez, Johanna; Gómez Portilla, Karoll; Castaño Vélez, Elkin; Cadavid Herrera, José Vicente; Ramírez Hassan, Andrés

    2013-01-01

    Esta investigación estimó la elasticidad de la demanda intramolecular, marca y genérico, para tres patologías trazadoras, hipertensión esencial, diabetes e hiperlipidemia, en el mercado ético y privado colombiano, a partir de una especificación dinámica del modelo AIDS basado en técnicas de cointegración. La estimación de la elasticidad de la demanda intramolecular permite concluir que tanto medicamentos de marca como genéricos son inelásticos ante cambios en su precio, son bienes de lujo seg...

  11. Competitividad manufacturera de México y China en el mercado estadounidense

    OpenAIRE

    Guzmán, Alenka; Toledo, Alejandro

    2005-01-01

    Las ventajas comparativas de las exportaciones mexicanas en el mercado estadounidense se acrecentaron en el marco del TLCAN. La desaceleración de la economía estadounidense afectó de manera desfavorable el flujo de exportaciones de México y la posterior recuperación de esa economía más bien favoreció a las mercancías de China, las cuales desplazaron a las mexicanas. Mexican exports comparative advantages in US market increased after NAFTA came into force. Economic deceleration in that coun...

  12. Economia de redes, externalidades e estruturas de mercado: o conceito de concorrência qualitativa

    Directory of Open Access Journals (Sweden)

    Alain Herscovici

    2013-05-01

    Full Text Available This paper aims to realize, from Rohfls’ model, a micro and meso analyze of the electronic networks and of internet. In regard to the complexity of the Information and Communication System (ICS, I will add the variables that correspond to these evolutions, and I will study the new competition forms. In this regard, I will propose a typology of the different markets, and I will demonstrate why the markets where the competition is qualitative are the most competitive. In a first part, I will present Rohfls’ model, I will show how the complexification of the system explains the emergence of new forms of competition, and I will highlight the limits of this model, in regard to these evolutions. In a second part, I will add some variables to Rohfls’ model, and I will construct a typology of the different kinds of competition and of market structures.O objetivo deste trabalho consiste em realizar, a partir do modelo de Rohfls,  uma análise micro e mesoeconômica das redes eletrônicas e da internet. Em função da complexificação dos Sistemas de Informação e Comunicação (SIC , acrescentarei as  variáveis que correspondem a essas evoluções, e analisarei as novas formas concorrenciais que caracterizam esses mercados. A este respeito, proporei uma tipologia dos diferentes mercados, e mostrarei porque os mercados nos quais se exerce uma concorrência qualitativa são os mais concorrenciais. Em uma primeira parte, apresentarei o modelo de Rohlfs (1974,  mostrarei em que medida   a complexificação do SIC se traduz por novas modalidades de concorrência, e ressaltarei os limites explicativos deste modelo diante dessas evoluções. Numa segunda parte,  acrescentarei uma série de variáveis ao modelo original de Rohlfs, e  construirei assim uma tipologia das diferentes formas de concorrência e das estruturas de mercado.

  13. ¿Han sido los mercados bursátiles eficientes informacionalmente?

    Directory of Open Access Journals (Sweden)

    Juan Benjamín Duarte Duarte

    2014-06-01

    Full Text Available En el presente trabajo se estudia la contrastación de la eficiencia demercados bursátiles en los últimos quince años, para ello se acude a la revisión de artículos de la base de datos ScienceDirect caracterizando los resultados de forma porcentual. Se encuentra que el 60 % de los trabajos rechaza la eficiencia del mercado, el 35 % presenta evidencia de eficiencia, y el 5 % restante verifica una mejora progresiva de la eficiencia debida a reformas económicas, mayor velocidad en el flujo de información y el lanzamiento de nuevos productos financieros.

  14. Eficiencia en el mercado financiero del Ecuador: tasa forward como predictor de la tasa spot futura

    OpenAIRE

    Cadena, Sandra; Gencon, Juan P.; Lemus Sares, Daniel

    2009-01-01

    El presente documento constituye un estudio sobre la eficiencia en el mercado financiero ecuatoriano vista desde la óptica del poder predictivo de las tasas de interés implícitas en la estructura a plazos de los tipos corrientes sobre las tasas de interés futuras. La realización de este trabajo tiene como base la hipótesis de las expectativas, la cual considera que las futuras tasas de interés están determinadas por las expectativas que los agentes económicos mantienen sobre dichas tasas de i...

  15. Importación del papel autocopia de China para el mercado Peruano 2008- 2014

    OpenAIRE

    Flores Jaramillo, Isidro Eusebio

    2015-01-01

    El objetivo de esta investigación fue determinar la evolución de las importaciones del papel autocopia producida en china y su importación al mercado Peruano en el periodo 2008 – 2014 el tema se enfoca en conocer a todos la gran importancia que tiene el papel autocopia tanto así que puede ayudar a miles de personas no se necesita una fotocopiadora para sacar una copia o papel calca como su nombre lo dice es autocopiativo. El tipo y diseño de investigación fue descriptivo no ...

  16. Antecedentes da intenção de compra: mercado de roupa de luxo no Brasil

    OpenAIRE

    Araújo, Cristiano Mineiro Branco de

    2012-01-01

    O maior desafio da indústria de luxo internacional é aumentar sua presença de mercado, pois assim como em outros segmentos, o aumento da concorrência exige que as empresas sejam mais competitivas e sólidas, reduzindo custos e mantendo a qualidade dos seus produtos. Despontando dentre as principais economias internacionais, o Brasil vem crescendo no cenário mundial do luxo, ganhando destaque principalmente na indústria da moda de luxo. Diante deste contexto do crescimento de ...

  17. LA CADENA DE VALOR DEL CACAO EN PERÚ Y SU OPORTUNIDAD EN EL MERCADO MUNDIAL

    OpenAIRE

    Barrientos Felipa, Pedro

    2015-01-01

    El objetivo de este trabajo es describir las características de la cadena de valor del cacao en Perú. Para ello se realiza un estudio de tipo documental que relata el desempeño de los mercados de comodities agrarios, la comercialización de estos, el funcionamiento de la cadena en el País y la explicación de la estrategia nacional para este producto. Como resultado se plantea que el contexto en que se desarrolla el cacao peruano presenta ventajas debido a los problemas que tienen los productor...

  18. Mercado laboral colombiano: conflicto entre teoría y realidad

    Directory of Open Access Journals (Sweden)

    Adolfo Eslava

    2008-10-01

    Full Text Available En este trabajo se describen, en primer lugar, generalidades de la teoría económica para explicar el comportamiento del mercado laboral. Luego, se plantean algunos vacíos que manifiestan la insuficiencia teórica frente al análisis empírico; en particular, se muestra que algunas variables como la inactividad y la participación laboral secundaria son piezas fundamentales para explicar las cifras del desempleo. Por último, se demuestra que un aumento general de los salarios reduce la oferta laboral por parte de los miembros secundarios de los hogares.

  19. Notas sobre a forma e a razão dos conflitos no mercado de consumo

    OpenAIRE

    Bevilaqua, Ciméa

    2001-01-01

    Explorando a perspectiva proposta por Marcel Mauss, este artigo apresenta algumas reflexões sobre a coexistência entre as lógicas do dom e do mercado na sociedade brasileira, tomando por base uma pesquisa etnográfica realizada em Curitiba (PR) sobre conflitos decorrentes de relações de consumo. A etnografia indica que a premissa da equivalência entre os parceiros - que evoca a economia do dom, na qual as trocas vinculam sujeitos enquanto sujeitos por meio de objetos - não é, de modo algum, um...

  20. Una mirada al mercado de venta y compra de calzado femenino en internet

    OpenAIRE

    Cardona Acosta, Paula Andrea; Botero Salazar, Verónica Alejandra

    2017-01-01

    El presente trabajo aborda las características y particularidades del mercado de venta y compra por internet, en específico el que se refiere al calzado femenino -- Para dicho acercamiento se analizaron en detalle los resultados de una investigación de tipo descriptivo con 384 compradoras y no compradoras de calzado femenino por internet, así como tres entrevistas en profundidad a dichas clientas para conocer su disposición a la compra, identificar los sitios web más usados para compra y vent...

  1. Comportamento do consumidor de refrigerantes: reflexos da mudança no mercado brasileiro

    OpenAIRE

    Granato, Lourenço Augusto Camargo

    2009-01-01

    Esse estudo tem como proposta investigar a mudança de comportamento do consumidor no Brasil, compreender os principais motivos para o crescimento da nova linha de refrigerantes e demais categorias de bebidas com apelo ao saudável e seus efeitos na indústria brasileira de bebidas. Desse modo, objetiva-se apresentar um histórico do comportamento do consumidor, a maneira como ele está migrando, e qual a resposta que o mercado de bebidas lhe oferece nesse contexto. Percebeu-se a im...

  2. Hydrocarbon market in El Salvador; Mercado de hidrocarburos en El Salvador

    Energy Technology Data Exchange (ETDEWEB)

    Nava de Hernandez, Gina Mercedes [Ministerio de Economia, Direccion de Energia, Minas e Hidrocarburos (El Salvador)

    1997-07-01

    This document presents a summary of the present situation of the market of hydrocarbons in El Salvador, doing a synthesis of the conformation of the industry, of the demand of the country, the prices and others. In addition, it shows the situation before and after the deregulation, making emphasis in the changes originated by such a measure. [Spanish] El presente documento presenta un resumen de la situacion actual del mercado de los hidrocarburos en El Salvador, haciendo una sintesis de la conformacion de la industria, de la demanda del pais, los precios y otros. Ademas muestra la situacion antes y despues de la desregulacion, haciendo enfasis en los cambios ocurridos por tal medida.

  3. As políticas activas e passivas do mercado de trabalho

    OpenAIRE

    Novo, Álvaro; Centeno, Mário

    2008-01-01

    A generalidade dos países utiliza políticas destinadas a minorar os custos sociais e individuais do desemprego. Os economistas classificam estas políticas do mercado de trabalho em dois grupos: (i) políticas activas e (ii) políticas passivas. As primeiras têm como objectivo dotar os desempregados com as qualificações necessárias para minimizar a duração do desemprego, enquanto as segundas visam garantir uma fonte de rendimento durante o período de desemprego, sendo particularmente úteis para ...

  4. Instrumentos financieros del mercado de derivados que se manejan en México

    Directory of Open Access Journals (Sweden)

    Cristina Pacheco Ornelas

    2016-02-01

    Full Text Available Las operaciones de comercio internacional, de las que se derivan la movilidad de capitales, intensifican el riesgo de los empresarios inversionistas. En este trabajo se señala la forma para administrar el riesgo; también se presenta un breve bosquejo del marco legal que regula las relaciones entre los presentadores y usuarios de los servicios financieros, así como una breve descripción de los instrumentos financieros que se manejan en el mercado mexicano de derivados y el comportamiento registrado en la demanda de estos servicios.

  5. La obsolescencia programada en el bien de consumo y la dinámica del mercado

    OpenAIRE

    Espeleta Rios, Ana Milena

    2017-01-01

    Las economías mundiales en proceso de recuperación, con grandes fábricas y una dotación mano de obra altamente productiva, demandaban del mercado un mayor nivel de consumo. Este entorno propició el cambio de foco económico hacia una sociedad de consumo. En este escenario se desarrolla la Obsolescencia Programada como una saludable insatisfacción en cuanto a hacer las cosas menos bien de lo que pueden hacerse con la intención de aumentar la rotación de los productos en mano de los consumidores...

  6. Perfume, história e design: o papel das embalagens no mercado brasileiro de perfumaria

    OpenAIRE

    Camila Assis Peres Silva

    2012-01-01

    O presente trabalho tem por objetivo apresentar o papel do design no mercado brasileiro de perfumes. Parte-se da hipótese de que é ele o elemento fundamental para o bom desempenho desse segmento. Na medida em que ele possibilita a diferenciação entre as diversas embalagens, criando uma segmentação para o consumo nas mais diversas camadas sociais. Inicialmente será apresentado o universo do perfume, abordando seus aspectos técnicos e culturais. Uma relação de matérias primas utilizadas na i...

  7. Fallas de mercado en capital humano. La trampa intergeneracional de la pobreza en México

    Directory of Open Access Journals (Sweden)

    David Mayer-Foulkes

    2007-01-01

    Full Text Available El desarrollo humano, entendido como un sinergismo a largo plazo entre los avances tecnológicos, fisiológicos y culturales, es un factor decisivo y de largo alcance en el crecimiento económico. Sin embargo, su proceso se caracteriza por trampas intergeneracionales que retardan el crecimiento económico y que deben tomarse en cuenta en el análisis de los efectos de las reformas pro-mercado en los pobres. Verificamos empíricamente la presencia de estas trampas intergeneracionales en el caso de México, al mostrar la existencia de los siguientes elementos constitutivos. La educación presenta rendimientos crecientes que no son aprovechados por la mayoría de la población (estimadores mincerianos que incluyen estatura y escolaridad. La nutrición y la salud infantiles están fuertemente asociadas a la probabilidad de continuar en las etapas escolares sucesivas (estimadores probit para la continuación escolar tres años más, una vez controlada la educación, el ingreso y la situación económica de los padres. La población se clasifica en dos niveles sociales: con secundaria completa o menos, y con 15 o más años de escolaridad. Los avances en la escolaridad del grupo más bajo responden principalmente a la educación pública. Se analizan las fallas de mercado que podrían causar la trampa intergeneracional de acumulación de capital humano. Aun cuando las reformas pro-mercado recientes en México aumentaron los rendimientos de la educación, la presencia de la trampa impidió la inversión necesaria en capital humano, y los beneficios de la reforma fueron menores que lo esperado. Para promover el crecimiento económico a largo plazo de una manera efectiva, las reformas pro-mercado deben complementarse con políticas que apoyen la nutrición, la salud y el desarrollo infantil, así como también la educación.

  8. Planes mínimos obligatorios en mercados de seguros de salud segmentados

    OpenAIRE

    Beteta, Edmundo; Willington, Manuel

    2009-01-01

    El trabajo analiza el efecto de la introducción de un plan mínimo obligatorio de prestaciones (PMO) que tanto el seguro público como los seguros privados deben cubrir. El análisis se realiza considerando la existencia de un mercado de seguros de salud segmentado en el sentido que, previo a la introducción del PMO, el seguro público sólo atiende a individuos de alto riesgo y los seguros privados sólo a individuos de riesgo bajo (la segmentación se obtiene de manera endógena en el modelo). Al c...

  9. Arquitectura y mercado en la Sevilla del siglo XIX: la plaza de abastos de Triana

    OpenAIRE

    Fernández González, Alberto

    2010-01-01

    En 2002, tras una drástica intervención que se prolongó varios años, el histórico mercado de Triana dejó paso a un moderno centro comercial. En este artículo se estudia la historia constructiva del edificio ochocentista diseñado por Tomás Escacena. También se analizan los diferentes planos y proyectos relativos al establecimiento que custodia el Archivo Municipal de Sevilla, alguno inédito todavía, como el croquis delineado por José Manfredi y Juan Bermejo; y se da a conocer un valioso levant...

  10. Las Cortes y el mercado: normativa comercial en la Castilla bajomedieval (1252-1520)

    OpenAIRE

    García Díaz, Jesús

    2016-01-01

    ¿Un estudio sobre la normativa comercial en la Castilla bajomedieval a través de las Cortes? La presente Tesis Doctoral es el resultado parcial de un gran Proyecto de Investigación que se gestó hace ya algunos años, y que tenía como objetivo principal el análisis del mercado en la Corona castellana durante los siglos finales de la Edad Media desde el punto de vista de su reglamentación normativa. Ya entonces comprobábamos c&oacu...

  11. Crisis gemelas, régimen cambiario e información de mercado

    OpenAIRE

    Lago, Fernando Pablo

    2005-01-01

    En este trabajo se investiga cómo el régimen cambiario y la existencia de información imperfecta respecto de los fundamentals de la economía afecta la probabilidad de ocurrencia de una crisis gemela. Se demuestra que una crisis bancaria es más probable cuanto menor sea la calidad de la información de mercado disponible. Si las reservas con que cuenta el banco central son escasas, una crisis bancaria puede desembocar en una crisis cambiaria al aumentar el volumen de la salida de capitales, si ...

  12. El Mercado Europeo de Productos Orgánicos de Comercio Justo

    OpenAIRE

    Garibay, Salvador; Richter, Toralf

    2005-01-01

    Los países centroamericanos son importantes productores de productos orgánicos. Su base de exportaciones, sin embargo, es altamente dependiente de un número limitado de productos (café, cacao, banano, azúcar) lo que atenta contra la sostenibilidad del sector exportador. Por lo tanto, hay una urgente necesidad de diversificar la base de exportaciones y de desarrollar mercados nacionales y regionales, los cuales están creciendo continuamente y tienen un gran potencial. El propósito de este repo...

  13. Mercado consumidor de carne suína e derivados em Belo Horizonte

    OpenAIRE

    Faria,I.G.; Ferreira,J.M.; Garcia,S.K.

    2006-01-01

    Avaliou-se o comportamento do mercado consumidor de carne suína e seus derivados em Belo Horizonte. Foram entrevistados 401 consumidores, homens e mulheres, maiores de 19 anos de idade, mantendo-se a proporcionalidade observada no censo populacional. Além de sexo e faixa etária, escolaridade, ocupação e renda familiar foram levantadas para compor os fatores condicionantes da pesquisa. A carne suína in natura é consumida até três vezes por semana pela maioria da população (61,6%), em função de...

  14. Magmatic-hydrothermal fluids and volatile metals in the Spirit Lake pluton and Margaret Cu-Mo porphyry system, SW Washington, USA

    Science.gov (United States)

    Iveson, Alexander A.; Webster, James D.; Rowe, Michael C.; Neill, Owen K.

    2016-03-01

    The halogen-bearing minerals tourmaline, amphibole, and biotite formed during magmatic-hydrothermal processes associated with the late-stage cooling of the Spirit Lake granitoid pluton (Mt. St. Helens, WA) and with the younger sulphide-mineralised rocks of the Margaret Cu-Mo porphyry deposit located entirely within the pluton. Major- and trace-element discrimination suggests that one tourmaline population crystallised from fractionated late-stage melt pockets in granodiorite-monzogranitic dykes of the pluton. These coarse, euhedral, oscillatory, and complexly sector-zoned uvite tourmalines span a limited range in Mg/(Mg + Fe) [Mg#] space (0.4-0.7 apfu) and show the highest Ti, Ca, F, Nb, and Ta contents, and low X-site vacancies (X-site vacancies (>0.6 apfu), lower Ca and F contents, and the highest Li, As, and HREE contents (>80 ppm Li, >1200 ppm As). This population appears to record direct, rapid crystallisation from magmatic ± meteoric fluid(s) bearing the signature of the breakdown of primary feldspars and pyroxenes, with fluid exsolution from fractionated melt patches likely triggered by the formation of the previous generation of tourmaline. Mineralised porphyry deposit tourmaline compositions from the stockwork span a much larger range in Mg# space (0.05-0.9 apfu) and are almost entirely Ca-free. X-sites of these schorl tourmalines are dominated by Na or vacancies, and the Y-sites are strongly Fe enriched. The highest Mn and Zn concentrations (>4000 and >1000 ppm, respectively) potentially reflect the composition of mineralising fluids during ore deposition. A number of boron isotopic analyses yield predominantly heavy boron, but δ11B values range from -5.2 to 6.2 ‰ and average 1.4 ‰. Whilst most plutonic tourmalines conform to reported a- and c-sector element partitioning models, those from the mineralised porphyry show large and variable sector fractionation differences, suggesting that external controls may also be important. Wider evidence for

  15. Zircon U-Pb Ages Chronicle 3 Myr of Episodic Crystallization in the Composite Miocene Tatoosh Pluton, Mount Rainier National Park, Washington Cascades

    Science.gov (United States)

    Bacon, C. R.; Du Bray, E. A.; Wooden, J. L.; Mazdab, F. K.

    2007-12-01

    Zircon geochronology of upper crustal plutons can constrain longevities of intermediate to silicic magmatic systems. As part of a larger study of the geochemistry and metallogeny of Tertiary Cascades magmatic arc rocks, we used the USGS-Stanford SHRIMP RG to determine 20 to 28 238U-206Pb ages for zircons from each of 6 quartz monzodiorite (qmd), quartz monzonite (qm), or granodiorite (grd) samples representative of the Tatoosh pluton, and one grd from the nearby Carbon River stock. The 7x12 km composite Tatoosh pluton, discontinuously exposed on the south flank of Mount Rainier, consists of at least 4 petrographic/compositional phases, here termed Pyramid Peak, Nisqually, Reflection Lake, and Tatoosh. These collectively intrude gently folded and weakly metamorphosed basaltic andesite flows and volcaniclastic rocks of the Eocene Ohanapecosh Formation, silicic ignimbrites and sedimentary rocks of the Oligocene Stevens Ridge Formation, and basaltic to intermediate volcanic rocks of the Miocene Fifes Peak Formation. Histograms and relative probability plots of U- Pb ages indicate 2 to 4 age populations within each sample. The weighted mean age of each of the youngest populations (all ±2σ) is interpreted as the time of final solidification: Pyramid Peak qmd (58.5% SiO2) 17.4±0.2 Ma, Nisqually grd (in Paradise Valley; 65.4% SiO2) 16.7±0.2 Ma, Nisqually grd (at Christine Falls; 66.4% SiO2) 17.3±0.2 Ma, Reflection Lake qm (along Pinnacle Peak trail; 66.6% SiO2) 17.1±0.2 Ma, Tatoosh grd (in Stevens Canyon; 67.8% SiO2) 18.2±0.2 Ma, Tatoosh grd (south of Louise Lake; 69.3% SiO2) 19.3±0.1 Ma, and Carbon River grd (68.0% SiO2) 17.4±0.3 Ma. The older Nisqually grd age is indistinguishable from a TIMS zircon age of 17.5±0.1 Ma reported by Mattinson (GSA Bulletin 88:1509-1514, 1977) for grd from a nearby locality. None of the 164 SHRIMP-RG U-Pb ages, including cores, is older than 21 Ma. The relatively small, high-level pluton likely was emplaced and solidified in pulses

  16. Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil

    Directory of Open Access Journals (Sweden)

    Marcela Paschoal Perpétuo

    Full Text Available ABSTRACT: The Serra da Aldeia Suite is composed by circular or oval-shaped plutons, intrusive in meta-sedimentary and meta-volcanosedimentary rocks in the Riacho do Pontal Fold Belt, NE Brazil. The Serra das Melancias Pluton, belonging to Serra da Aldeia Suite, is located southeastern of Piaui state, near Paulistana city. These plutons represent a major magmatic expression in this area and contain important information about the late magmatic/collisional geologic evolution of the Brasiliano Orogeny. Based on petrographic and geochemical data, three facies were defined in the Serra das Melancias Pluton: granites, syenites and quartz monzonites. The rocks display high-K and alkaline to shoshonitic affinities, are metaluminous and show ferrous character. They are enriched in Light Rare Earth Elements and Large Ion Lithophile Elements, with negative anomalies in Nb, Ta and Ti. Their high Ba, Sr, K/Rb, low Rb, relatively low U, Th, Nb to very low Heavy Rare Earth Elements and Y resemble those of typical high Ba-Sr granitoids. The geochemical data suggest the emplacement of Serra das Melancias Pluton in a transitional, late to post-orogenic setting in the Riacho do Pontal Fold Belt during the late Brasiliano-Pan African Orogeny.

  17. Age and isotopic fingerprints of some plutonic rocks in the Wiborg rapakivi granite batholith with special reference to the dark wiborgite of the Ristisaari Island

    Directory of Open Access Journals (Sweden)

    Rämö, O.T.

    2014-12-01

    Full Text Available The mid-Proterozoic, locus classicus Wiborg rapakivi granite batholith of southeastern Finland and adjacent Russia comprises a varying, bimodal (silicic-basic sequence of plutonic, subvolcanic, and volcanic rocks. At the current level of erosion silicic rocks are dominant, the most prominent of which are wiborgites and dark wiborgites (that have been considered to mark the main build-up stage of the batholith and pyterlites. New observations and optical microscopy data from the dark wiborgite-dominated Ristisaari Island in the southern, off-shore part of the Wiborg batholith show that dark plagioclase megacrysts in dark wiborgite are calcic xenocrysts. They were probably incorporated into wiborgite magma from consanguineous massiftype anorthosite magmas in the course of the evolution of the bimodal magmatic system. Our new ID-TIMS U-Pb zircon age of the Ristisaari Island dark wiborgite, 1627±3 Ma, is the youngest isotopic age so far determined for the plutonic rocks of the Wiborg batholith. This, combined with preexisting U-Pb zircon data, implies a minimum duration of 12 m.y. (1642–1630 Ma for the emplacement of the plutonic rocks of the batholith. Combined with data on highlevel dike rocks, a window of at least 20 m.y. (1642–1622 Ma is implied. Furthermore, as the batholith grew, the overall locus of magmatism may have shifted southwards. New whole-rock Nd isotope data on the dark wiborgite of the Ristisaari Island and three further granites of the batholith, as well as Nd (whole-rock and Sr (whole-rock, plagioclase isotope data on a spectrolite massif-type anorthosite from the east-central part of the batholith, are also presented. These data suggest that the lithosphere across the Wiborg batholith area in the southeastern part of the Svecofennian orogen may vary slightly in overall mantle separation age.

  18. U-Pb zircon geochronology and Sm-Nd-Pb isotopic constraint for precambrian plutonic rocks in the northeastern part of Ryeongnam massif, Korea

    International Nuclear Information System (INIS)

    Chang, Ho-Wan

    2003-01-01

    The Ryeongnam massif is composed of Precambrian gneisses, Paleozoic and Mesozoic sedimentary rocks and extensive Triassic-Jurassic plutonic rocks of felsic to mafic composition. In the northeast Ryeongnam massif, the oldest rocks belong to the Sobaegsan gneiss complex, which is composed of orthogneisses, paragneisses and mafic plutonic rocks. U-Pb zircon ages for the felsic and mafic intrusive bodies within the Sobaegsan gneiss complex are: the Icheon granite gneiss, 2357±43 and 2342±47 Ma; the Buncheon granite gneiss, 1963±5 Ma; the Pyeonghae granite gneiss, 1936±21 Ma; the Ogbang amphibolite, 1918±10 Ma; the Imwon leucogranite gneiss, 1826±20 Ma. The Hyeondong biotite schist, which is intruded by the Buncheon granite gneiss and the Ogbang amphibolite, yielded an age of 2271±44 Ma. The Nd-Sm-Pb isotopic data indicate that the felsic plutonic rocks are derived from an older Archean crust. The Nd T DM ages are Archean, and the εNd values are negative for the felsic rocks and positive for the amphibolite. Common Pb isotope compositions also indicate a crustal source for the felsic intrusives. The U-Pb ages of Precambrian rocks of the Ryeongnam massifs are similar to those in the Gyeonggi massif, and may have a similar crustal evolutionary history. The Precambrian rocks of South Korea could be related either to the North China block or to the South China block, as the isotope ages and patterns are not unique to either block. Similarly, a geologic correlation with Japan, although possible, is tenuous at present. (author)

  19. El contrato entre “XM compañía de expertos en mercados S.A. E.S.P.” y los agentes del mercado de energía mayorista

    OpenAIRE

    Botero Restrepo, Clara Patricia

    2006-01-01

    Hace ya varios años que se han venido presentando controversias en torno al contrato que celebra “XM Compañía de Expertos en Mercados S.A. E.S.P.” –antes ISA- con los agentes del mercado de energía mayorista. Por ello se considera necesario estudiar su naturaleza jurídica, su alcance, y la jurisdicción competente para conocer de los litigios que surjan con ocasión de él.

  20. Sistema de gestión en los mercados municipales de Castilla y León

    OpenAIRE

    Peña Santiago, Eder

    2015-01-01

    El objetivo principal es analizar la gestión de los mercados municipales de abastos de Castilla y León fundamentalmente a través de dos análisis. En primer lugar a través de un análisis estadístico de los datos aportados por los gerentes en los mercados de Castilla y León. En segundo lugar a través de un análisis estadístico de la importancia y la opinión de los comerciantes sobre el modelo de gestión en los mercados de Castilla y León. Grado en Comercio