Sample records for basin argentina palynofacies

  1. Depositional environments and hydrocarbon potential of the Middle Jurassic Los Molles Formation, Neuquén Basin, Argentina: palynofacies and organic geochemical data Ambientes depositacionales y potencial oleogenético de la Formación Los Molles, Jurásico Medio de la Cuenca Neuquina, Argentina: palinofacies y datos de geoquímica orgánica

    Marcelo A Martínez


    Full Text Available Amultidisciplinary analysis of palynofacies in a sequence-stratigraphical framework, TOC (total organic carbon and TAI (thermal alteration index analyses, has been applied to outcrop samples of the uppermost Los Molles Formation (Middle Jurassic, Neuquén Basin, Argentina, in order to characterise the palaeoenvironmental and palaeo-climatic conditions during the deposition of this unit. Five types of palynofacies (P-l to P-5 have been identified and are interpreted to indicate a restricted marine to inner neritic environment. In P-1 and P-4, a marine environment close to the terrestrial source area with moderate oxidizing conditions and energy, is suggested. In P-2, the assemblage of freshwater algae, acritarchs and prasinophytes suggest a marginal marine environment influenced by fluvial discharge. In P-3, the marine microplankton content reflects conditions ranging from a marginal-marine (sub-normal salinity to an inner neritic environment. In P-5, a dysoxic marine environment (probably marginal is suggested. Warm and relatively humid (abundance of Cheirolepidiaceae in association withAraucariaceae and locally humid (presence of swamps or ponds, on the alluvial plains conditions are inferred. TOC content (65% of the analyzed samples reach TOC values over 1%, TAI values (2 to 2+, transitional between an immature phase and the window of liquid petroleum generation and kerogen type (P-1, P-2 and P-5 show transitional characteristics between kerogen type II and III, while P-3 and P-4 show characteristics of kerogen type III and occasionally type IV, suggest that, in the studied area, the Los Molles Formation has some hydrocarbon potential. However, kerogen state suggests that the anoxic-dysoxic conditions of the site of deposition were not optimum for its preservation.El análisis multidisciplinario de las palinofacies, carbono orgánico total (COT e índice de alteración térmica (IAT en un contexto estratigráfico-secuencial ha sido llevado a

  2. Paleoenvironmental reconstruction based on palynofacies analyses of the Cansona Formation (Late Cretaceous), Sinú-San Jacinto Basin, northwest Colombia

    Juliao-Lemus, Tatiana; Carvalho, Marcelo de Araujo; Torres, Diego; Plata, Angelo; Parra, Carlos


    To reconstruct the paleoenvironments of the Cansona Formation, a Cretaceous succession in Colombia that has controversial paleoenvironmental interpretation, occasionally deep marine and occasionally shallow marine, palynofacies analyses were conducted on 93 samples from four sections of the Sinú San Jacinto Basin in the north, midwest, and southwest sectors. For the palynofacies analyses, the kerogen categories were counted and subjected to cluster analyses. Four palynofacies associations were revealed for the four sections: Palynofacies Association I (PA I), which consisted of microforaminiferal linings, scolecodonts, dinoflagellate cysts, pollen grains, and fungi hyphae; PA II, which consisted of phytoclast translucent non-biostructured and biostructured, opaque phytoclasts (equidimensional and lath shaped); PA III, which consisted of pseudoamorphous particles, cuticles, resin, and fungal spores; and PA IV, which consisted of fluorescent and non-fluorescent amorphous organic matter and the fresh-water algae Botryococcus. In contrast to early studies that suggested a generalization of the depositional environment for the Cansona Formation (deep or shallow conditions), this study suggests that the formation reflects conspicuous stratigraphic and lateral changes and hence different depositional environments. The Cerro Cansona (CC4 section) and Chalán (AP section) areas are a more marine proximal settings (Early Campanian-Maastrichtian), and there is an intermediate setting for the Lorica area (SC section) and deeper conditions for the Montería area (CP2 section).

  3. Comparing palynofacies and palaeoenvironment of Sarcheshmeh Formation in Joragh and Sheikh section (east and west of Kopeh-Dagh Basin

    Mohsen Allameh


    Full Text Available 1-Introduction: Kopeh-Dagh sedimentary basin is located in NE of Iran and is mainly composed of Mesozoic and Cenozoic sedimentary rocks (35 30ˊ-38 15ˊ N, 54 00-61 31ˊE(Afshar-Harb 1994. The Sarcheshmeh Formation is one of the lower Cretaceous strata in Kopeh-Dagh. In this investigation, the mentioned Formation is investigated in two stratigraphic sections which are as follow: 1 Jooragh village which is located between 59 10ˊ7 E and 36 58ˊ16 N geographical coordinates with 950 m elevatuion, in 65 km far from Mashhad city in the Mashhad-Quchan road in the east of Chenaran township. 2 Sheikh village which is located between 37 32ˊ48 N and 5731ˊ22 E geographical coordinates with 1125 m elevatuion, in 20 km far from Bojnourd city. 2- Matherial & Method The main porpose of this research in determination and analysis of the existed palynofacies according to the changed percentage of 3 main groups of palynological elements (AOM, Phytoclasts, Marine Palynomorph. Relative analysis of the sedimentary environment are according to the palynofacies and the existed index dinoflagellates for environment and also evaluation of Oxygen and its changes in different parts and as well the determination of sedimentation rate in the Sracheshmeh Formation in the east and west of Koept-Dagh sedimentary basin. The material used, inclues 35 outcrop sample collected from shale and marly shale layer throughout the Sarcheshme Formation in Jorgh section and collected 41 sample from Sheikh section. Laboratory maceration procedures of Travers (2007 were used to prepare sample. These procedures include chemical treatment of 15-20 gr of each sample with cold HCL (20% and HF (37% acids were used to dissolve carbonate and silicates. No oxidants or Alkalis were used, because such treatments can be affect the natural colors of palynomorphs and phytoclast. The residue was neutralized centrifuged in Zncl2 (specific gravity 1.9, then sieved

  4. Petroleum geology of the northwest basin, Argentina

    Ko, Jae Hong [Yonsei University, Seoul (Korea, Republic of); Oh, Jae Ho [Korea Institute of Geology Mining and Materials, Taejon (Korea, Republic of); Kim, Jong Young [Dong Won Co., Sabuk (Korea, Republic of)


    Petroleum geology of the Northwest Basin, Argentina has been studied in detail using seismic reflection profiles, drill holes and structure maps. The Northwest Basin comprises the following four successor basins that are different in characteristics and tectonic development: pre-Carboniferous, Carboniferous, Cretaceous, and Tertiary basins. Petroleum plays in the Northwest Basin can be divided into four types based on hydrocarbon-trap structures. These include thrust-folds, paleo-channels, volcanic mounds and roll-over anticlines related to normal faulting. The thrust-fold structure is a typical trap structure of pre-Carboniferous and Carboniferous basins, and consists of Cretaceous sedimentary rocks in southern exploration areas of the Northwest Basin. Paleo-channels provide a new possibility to the Carboniferous basin, and several of them occur in northern exploration areas of the Northwest Basin. Volcanic mounds and roll-over anticlines associated with the normal fault are related to the rifting event and play an important role in the Cretaceous basin. New prospects will be found if the above play types are well utilized. (author). 12 refs., 15 figs.

  5. Palynostratigraphy, palynofacies and palaeoenvironment of deposition of Selandian to Aquitanian sediments, southeastern Nigeria

    Okeke, Kingsley K.; Umeji, Obianuju P.


    Investigation of outcrop sections along the Onitsha-Awka transect in the Niger Delta Basin southeastern Nigeria was undertaken to assess the palynological composition, palynofacies and palaeoenvironment of deposition. Stratigraphic ranges of palynomorphs suggest an age of Selandian to Aquitanian. The palynological composition is marked by abundance of dinoflagellate cysts in the Imo Formation (Selandian to Thanetian), dominance of spores and pollen over dinoflagellate cysts in the Nanka Formation (Ypresian to Bartonian), and overwhelming amounts of spore and pollen in the Ogwashi Formation (Pariabonian to Aquitanian). Palynofacies content shows dominance of structureless organic matter in the Imo Formation, few phytoclasts in the Nanka Formation and maximum phytoclast amounts in the Ogwashi Formation. Thanetian to Ypresian boundary was marked by the mixing of older Palaeocene and younger Eocene microfossils, decrease of microflora towards the end of Palaeocene and the evolution of abundant and more diverse Eocene taxa. The Imo Formation was deposited in middle to outer neritic zone based on abundance of gonyaulacacean cysts. However, peridiniacean and terrestrial microflora extend the deposition range to shallow waters of inner neritic and coastal zone. Increase in diversity and abundance of terrestrial palynomorphs over marine palynomorphs assemblages in the overlying Nanka Formation suggest deposition under alternating coastal and inner neritic conditions while the Ogwashi Formation records oscillating coastal plain and brackish water depositional conditions. The palaeoenvironments illustrate that general retrogradation was followed by progradation of the delta during the Cenozoic.

  6. The Neuquén basin, Argentina: A case study in sequence stratigraphy and basin dynamics

    Alberto C. Riccardi


    @@ As stated in one of the contributions to this volume, the Neuquen Basin-covering more than 160,000 km2 between c. 32° and 42° S and 68° and 71° W, and containing a Meso-zoic-Cenozoic sedimentary succession at least 7 km thick-is perhaps one of the most thoroughly prospected areas in Argentina. Its geological study goes back to the 19th Century, and shows an exponential increase throughout the 20th, when it became the main source of Argentine oil and gas production.

  7. A reconstructed reduction sequence for curved bifacial stone tools from the eastern La Plata Basin, Argentina

    Riris, Philip; Romanowska, Izabela


    A distinctive regional lithic industry is found in the eastern La Plata basin, known as the Altoparanaense culture in northeastern Argentina, and the Humaitá tradition in southern Brazil. These archaeological cultures are recognised on the basis of large bifacial tools. The earliest deposits are dated to the ninth millennium BP, and elements of these industries continue to be produced into the post-contact period (8640±95 to 310±50 cal BP). One of the most characteristic features ...

  8. Terrain characterization and structural control of the Auca Mahuida volcanism (Neuquén Basin, Argentina)

    Ventura, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; De Ritis, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Longo, M.; Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, La Plata, Argentina; Chiappini, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia


    Geomorphometric parameters (slope, aspect, valley depth, and areal density of cones) derived from a moderate resolution digital elevation model with a grid spacing of 100 m are used in an attempt to interpret the tectonic/structural features related to surface deformation in the Auca Mahuida volcanic terrain (Neuquén Basin, Argentina). The Auca Mahuida (2.03–0.88 Ma) is the southernmost volcanic field of the Payenia volcanic province, in the Andean foreland. The foreland is sub...

  9. Argentina

    The history of Argentina nuclear development can be summarized into two periods: 'splendour' and 'stand-by'. The former starting in the decade of the 1950s until the late 1970s while the latter period goes from the late 1970s to 2006. The first period (1950-1980) was characterized by a national policy of scientific and technological development; State intervention in the area of industrial production. The military aspects, if any, were marginal in the context of the overall development. During this period, important public scientific technological projects were carried out: the production and sale of experimental reactors, nuclear plants (Atucha I and Embalse), and some projects aimed to developing national industry. The stimulus experienced in the country in this period accompanied the role of nuclear technology worldwide due to the Cold War and the persuasion factor among the main powers. However, during the 1970s and 1980s the whole world started questioning these technologies which ran parallel to the liberalization of the countries economies. The second period (1980s onwards) was characterized by many economic problems and the consequent transitory stop of national nuclear projects; e.g. Argentina transitory stopped its third nuclear plant (at present under construction). At that moment, neoliberal politics were aimed at reducing the role of the State and promoting privatization, separating nuclear projects from governmental control, trying to privatize the nuclear plants, and cutting scientific budgets. Argentina has two nuclear power plants in operation providing 8.6% of the total country's electricity. A third one, 692 MW(e) power reactor PHWR Atucha-2 construction was stopped in the 1990s and re-started in 2007 it is expected to be in commercial operation by 2011). Argentina nuclear power plants utility, NA S.A. is preparing the refurbishment of its CANDU-6 reactor. Argentina Atomic Energy Commission (CNEA) has a prototype of its CAREM nuclear power plant

  10. Argentina


    This report presents a brief overview of the socio-economic, energy and environmental context in which climate change mitigation actions in Argentina shall be inserted. To that end, the dynamic of the Argentine economic development, its influence on the energy system and environmental impacts is summarised. From the environmental standpoint, emphasis shall only be made on the impact of economic development patterns and energy policies on GHG emission. (au) 73 refs.

  11. The origin of groundwater composition in the Pampeano Aquifer underlying the Del Azul Creek basin, Argentina.

    Zabala, M E; Manzano, M; Vives, L


    The Pampean plain is the most productive region in Argentina. The Pampeano Aquifer beneath the Pampean plain is used mostly for drinking water. The study area is the sector of the Pampeano Aquifer underlying the Del Azul Creek basin, in Buenos Aires province. The main objective is to characterize the chemical and isotopic compositions of groundwater and their origin on a regional scale. The methodology used involved the identification and characterization of potential sources of solutes, the study of rain water and groundwater chemical and isotopic characteristics to deduce processes, the development of a hydrogeochemical conceptual model, and its validation by hydrogeochemical modelling with PHREEQC. Groundwater samples come mostly from a two-depth monitoring network of the "Dr. Eduardo J. Usunoff" Large Plains Hydrology Institute (IHLLA). Groundwater salinity increases from SW to NE, where groundwater is saline. In the upper basin groundwater is of the HCO3-Ca type, in the middle basin it is HCO3-Na, and in the lower basin it is ClSO4-NaCa and Cl-Na. The main processes incorporating solutes to groundwater during recharge in the upper basin are rain water evaporation, dissolution of CO2, calcite, dolomite, silica, and anorthite; cationic exchange with Na release and Ca and Mg uptake, and clay precipitation. The main processes modifying groundwater chemistry along horizontal flow at 30 m depth from the upper to the lower basin are cationic exchange, dissolution of silica and anorthite, and clay precipitation. The origin of salinity in the middle and lower basin is secular evaporation in a naturally endorheic area. In the upper and middle basins there is agricultural pollution. In the lower basin the main pollution source is human liquid and solid wastes. Vertical infiltration through the boreholes annular space during the yearly flooding stages is probably the pollution mechanism of the samples at 30 m depth. PMID:25747376

  12. Argentina

    Argentina has embarked on an ambitious domestic nuclear research and energy program. The venture promises to provide the nation with the infrastructure to play an important role in the nuclear export market in the years ahead. Buenos Aires built its program on a foundation of international support and assistance that overlay an emerging sophisticated industrial and scientific establishment. The foreign contribution sensitized Argentina to opportunities in the global market. This paper reports that Argentina operates two heavy-water/natural uranium reactors, Atucha I and Embalse. Producing, respectively, 320 MW(e) and 600 MW(e), they supply roughly 10 percent of the country's electricity. With a capacity factor of 84 percent, Atucha I is among the best operated plants in the world. Plans call for a third, 745 MW(e) power plant, Atucha II, to go on line in the early 1990s. During this period, construction also may begin on three 300 MW(e) plants, although the country's foreign indebtedness plus cost overruns in earlier construction will place a heavy burden on these plans

  13. The origin of groundwater composition in the Pampeano Aquifer underlying the Del Azul Creek basin, Argentina

    Zabala, M.E., E-mail: [Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, C1033AAJ Ciudad Autónoma de Buenos Aires (Argentina); Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff”, Av. República Italia 780, 7300 Azul, Provincia Buenos Aires (Argentina); Manzano, M., E-mail: [Escuela de Ingeniería de Caminos, Canales y Puertos y de Ingeniería de Minas, Universidad Politécnica de Cartagena, P° de Alfonso XIII 52, E-30203 Cartagena (Spain); Vives, L., E-mail: [Instituto de Hidrología de Llanuras “Dr. Eduardo J. Usunoff”, Av. República Italia 780, 7300 Azul, Provincia Buenos Aires (Argentina)


    The Pampean plain is the most productive region in Argentina. The Pampeano Aquifer beneath the Pampean plain is used mostly for drinking water. The study area is the sector of the Pampeano Aquifer underlying the Del Azul Creek basin, in Buenos Aires province. The main objective is to characterize the chemical and isotopic compositions of groundwater and their origin on a regional scale. The methodology used involved the identification and characterization of potential sources of solutes, the study of rain water and groundwater chemical and isotopic characteristics to deduce processes, the development of a hydrogeochemical conceptual model, and its validation by hydrogeochemical modelling with PHREEQC. Groundwater samples come mostly from a two-depth monitoring network of the “Dr. Eduardo J. Usunoff” Large Plains Hydrology Institute (IHLLA). Groundwater salinity increases from SW to NE, where groundwater is saline. In the upper basin groundwater is of the HCO{sub 3}-Ca type, in the middle basin it is HCO{sub 3}-Na, and in the lower basin it is ClSO{sub 4}–NaCa and Cl–Na. The main processes incorporating solutes to groundwater during recharge in the upper basin are rain water evaporation, dissolution of CO{sub 2}, calcite, dolomite, silica, and anorthite; cationic exchange with Na release and Ca and Mg uptake, and clay precipitation. The main processes modifying groundwater chemistry along horizontal flow at 30 m depth from the upper to the lower basin are cationic exchange, dissolution of silica and anorthite, and clay precipitation. The origin of salinity in the middle and lower basin is secular evaporation in a naturally endorheic area. In the upper and middle basins there is agricultural pollution. In the lower basin the main pollution source is human liquid and solid wastes. Vertical infiltration through the boreholes annular space during the yearly flooding stages is probably the pollution mechanism of the samples at 30 m depth. - Highlights: • The

  14. The origin of groundwater composition in the Pampeano Aquifer underlying the Del Azul Creek basin, Argentina

    The Pampean plain is the most productive region in Argentina. The Pampeano Aquifer beneath the Pampean plain is used mostly for drinking water. The study area is the sector of the Pampeano Aquifer underlying the Del Azul Creek basin, in Buenos Aires province. The main objective is to characterize the chemical and isotopic compositions of groundwater and their origin on a regional scale. The methodology used involved the identification and characterization of potential sources of solutes, the study of rain water and groundwater chemical and isotopic characteristics to deduce processes, the development of a hydrogeochemical conceptual model, and its validation by hydrogeochemical modelling with PHREEQC. Groundwater samples come mostly from a two-depth monitoring network of the “Dr. Eduardo J. Usunoff” Large Plains Hydrology Institute (IHLLA). Groundwater salinity increases from SW to NE, where groundwater is saline. In the upper basin groundwater is of the HCO3-Ca type, in the middle basin it is HCO3-Na, and in the lower basin it is ClSO4–NaCa and Cl–Na. The main processes incorporating solutes to groundwater during recharge in the upper basin are rain water evaporation, dissolution of CO2, calcite, dolomite, silica, and anorthite; cationic exchange with Na release and Ca and Mg uptake, and clay precipitation. The main processes modifying groundwater chemistry along horizontal flow at 30 m depth from the upper to the lower basin are cationic exchange, dissolution of silica and anorthite, and clay precipitation. The origin of salinity in the middle and lower basin is secular evaporation in a naturally endorheic area. In the upper and middle basins there is agricultural pollution. In the lower basin the main pollution source is human liquid and solid wastes. Vertical infiltration through the boreholes annular space during the yearly flooding stages is probably the pollution mechanism of the samples at 30 m depth. - Highlights: • The work studies the origin of

  15. Argentina

    One article from Argentina where is developed the proceedings before the Federal criminal court of First instance concerning environmental radiological contamination near the Eizeiza centre. A second article from Canada treats the federal court of appeal decision respecting the Mac Clean lake project; two articles from France, judgement of the court of appeal on Caen on the licence to reprocess Australian spent fuel, and judgement of the magistrates court of Limoges concerning dumping of radioactive waste by COGEMA; the last one article from Japan, concerns the judgement of the japanese supreme court confirming the validity of the licence to establish the Monju reactor. (N.C.)

  16. Argentina.


    Background notes on Argentina provide a profile of the geography, selected demographic features, government and economic conditions. Descriptive text includes a discussion of the people, their history and political conditions, the government and officials, the state of the economy, their defense, foreign relations, and relations with the US. The 1992 estimated population was about 33 million of whom 97% are European (mostly Spanish and Italian). Religions represented are Roman Catholic (92%), Protestant (2%), Jewish (2%), and other (4%). Adult literacy is 95%. 36% are engaged in industry and commerce, 20% in services, 19% in agriculture, 6% in transport and communications, and 19% other. Per capita gross domestic product was $4,500. There are only 50,000 native Indians remaining in peripheral provinces. The population enjoys a high standard of living and a low growth rate. The country was shaped by dominant forces: modern agricultural techniques and the integration of the country into the world economy. Foreign investment aided the economic revolution. Conservative and radical rule has swung the country back and forth politically since 1916. Colonel Juan Domingo Peron led a successful military coup in 1943 and was elected in 1946. Policies were instituted to give a greater voice to the working class, and with the influences of his wife, women's groups. In 1955, he was ousted by the military, which failed to revive the economy and quiet increasing terrorism. After a number of difficult elections, Peron was reinstated as president in 1973. Extremists on the left and right threatened public order; the military as a consequence imprisoned persons indefinitely. Peron's wife succeeded him after his death, but was removed from office in the military coup of 1976. Basic human rights were violated during this period. By 1983, a fair election was held and support increased for a democratic system. In 1989, Carlos Saul Menem, a Peronist candidate, won and established

  17. Argentina

    G. Benedetti


    Full Text Available El presente trabajo tiene como objetivo realizar un diagnóstico ambiental de un sector de la ciudad de Bahía Blanca, Argentina basado en el arbolado urbano de alineación. El arbolado constituye un componente fundamental de los paisajes artifi ciales ya que contribuye al aumento del confort y al mejoramiento de la calidad del medio. En este sentido, actúa como un factor moderador de las condiciones climáticas, la contaminación y la salud de la población. El municipio de la ciudad de Bahía Blanca tiene como proyecto la realización de inventarios del arbolado en los distintos barrios, para lograr optimizar la relación entre la cantidad de ejemplares arbóreos y la densidad poblacional. Es importante considerar la variedad de ejemplares en función del uso del suelo y de las características ambientales de cada sector. Por lo tanto, este trabajo presenta un diseño metodológico para la elaboración del plano verde de la ciudad.

  18. Argentina

    Hernan Galperin


    Full Text Available En este trabajo se analizan las bases sobre las que se está desarrollando el proceso de transición hacia la TV digital en Brasil y Argentina, y se discuten las posibilidades que la transición presenta para replantear la estructura de mercado y el modelo de regulación de la TV abierta en los países del Mercosur. La principal hipótesis es que la TV digital abre una oportunidad única para reformar el actual modelo de radiodifusión basado en la concesión de un número reducido de licencias a operadores de tipo generalista. Al multiplicar la capacidad de transmisión y facilitar el desarrollo de servicios interactivos tanto de entretenimiento como educativos y de información, la transición a la TV digital se ofrece como instrumento de política pública para alcanzar objetivos clave en materia de comunicación, como el pluralismo, la apertura del mercado y el achicamiento de la llamada brecha digital.

  19. Palynofacies as useful tool to study origins and transfers of particulate organic matter in recent terrestrial environments : synopsis and prospects.

    Sebag, D.; Copard, Y.; Di-Giovanni, Christian; Durand, A; Laignel, B.; Ogier, S.; E. Lallier-Vergès


    Palynofacies analysis is based on transmitted light microscope study of organic constituents isolated and concentrated by acid and basic digestions. Published results of studies of present-day terrestrial environments show that two complementary approaches successfully characterize particulate organic matter (OM) from palynofacies analyses. The first method is based on the identification and the quantification of some typical particles (optical markers) according to their origin (i.e. aquatic...

  20. Evolution and erosional dynamics of intermontane basins on the Puna Plateau, NW Argentina

    Bookhagen, B.; Strecker, M. R.


    The Puna Plateau in NW Argentina is the southern part of the second-largest orogenic plateau on Earth with a mean elevation of 4.0 ± 0.5 km (±2s). The Puna is an integral part of the south-central Andes that exhibit a steep E-W topographic and climatic gradient: The first windward topographic rise east of the Puna constitutes a significant orographic barrier resulting in high orographic rainfall. Westward, the higher-elevation areas of the windward flanks become progressively drier, until arid conditions are attained in the orogen interior. The Puna repeatedly experienced significant paleoclimatic changes reflected by fluvial and lacustrine terraces associated with lake highstands related to deeper penetration of moisture into the orogen and thus an orogenward shift of the climate gradient. The southern Puna is compartmentalized into more than 500 separate, internally-drained sedimentary basins with varying catchment size. Here, we quantify the erosion-rate gradients and their impact on basin evolution and their importance on the formation of the plateau morphology. We rely on sedimentary archives, digital topography, and a new set of cosmogenic inventories of river sands (10Be) and bedrock-erosion rates (10Be and 26Al) from the eastern and central plateau. Erosion rates from internally drained catchments in the eastern plateau are similar to the externally drained, semi-arid intermontane basins in the E Cordillera, which bounds the plateau, but are ten-fold (or more) lower than erosion rates in the humid and steep sections along the eastern windward flanks. Within the plateau realm, erosion rates are ten-fold lower in the central than in the eastern parts. We analyze high-resolution topography from ASTER- and interferometry-derived Digital Elevation Models (DEMs) that we have validated with more 10'000 differential GPS ground control points. We demonstrate distinct topometric gradients across the Puna that can be linked to spatial variations in rainfall and

  1. Indicative value of non-pollen palynomorphs (NPPs) and palynofacies for palaeoreconstructions: Holocene Peat, Brazil

    The results of the palynological study of the samples from the core, performed in the Aguas Claras peatland, RS, Brazil (50 45'00''W, 30 00'15''S), focus on detailed taxonomic analysis of non-pollen palynomorphs (NPPs) and palynofacies from the Holocene peat and underline the Late Pleistocene mud and sandy mud that were represented. NPPs from the samples revealed taxonomic variety of fungal palynomorphs, presented by Brachysporium, Clastesporium, Dicellaesporites, Dicellaeporisporites, Gelasinospora, Glomus, Sordaria, Helicoon, and others. The habitats of above mentioned taxa are varied: aquatic, mycorrhizal, parasitic, organic matter decaying, and dung-coprophilous. Freshwater algal palynomorphs were composed of Botryococcus, Closterium, Debarya, Mougeotia, Pseudoschizaea, Spirogyra, and Zygnema. The percentage ratio between algal and fungal palynomorphs was changed from the different samples of the core, reflecting climatic oscillations (more humid-dryer). Prevalence of fungal palynomorphs was connected with dryer climate, and on the contrary, freshwater algal palynomorph predominance was related with increasing humidity. The six palynomorph zones that corresponded to the six principal phases of environmental and climatic changes were determined. The zone from the uppermost part of peat was characterized by relatively frequent dung-coprophilous and parasitic fungi, as a result of agricultural and domestic activities. Palynofacies analysis combined to NPPs was used for palaeoenvironmental and paleoclimatic reconstructions. Palynofacies from the samples were characterized by evident changes in relationship (%) between the different types of organic matter, their quality, and quantity and fluorescence index. The obtained data contribute to the understanding of the peat deposition. The combined use of NPPs and palynofacies analyses provided a valuable approach for the paleoenvironmental and paleoclimatic reconstructions. (author)

  2. Surface uplift and convective rainfall along the southern Central Andes (Angastaco Basin, NW Argentina)

    Pingel, Heiko; Mulch, Andreas; Alonso, Ricardo N.; Cottle, John; Hynek, Scott A.; Poletti, Jacob; Rohrmann, Alexander; Schmitt, Axel K.; Stockli, Daniel F.; Strecker, Manfred R.


    Stable-isotopic and sedimentary records from the orogenic Puna Plateau of NW Argentina and adjacent intermontane basins to the east furnish a unique late Cenozoic record of range uplift and ensuing paleoenvironmental change in the south-central Andes. Today, focused precipitation in this region occurs along the eastern, windward flanks of the Eastern Cordillera and Sierras Pampeanas ranges, while the orogen interior constitutes high-elevation regions with increasingly arid conditions in a westward direction. As in many mountain belts, such hydrologic and topographic gradients are commonly mirrored by a systematic relationship between the oxygen and hydrogen stable isotope ratios of meteoric water and elevation. The glass fraction of isotopically datable volcanic ash intercalated in sedimentary sequences constitutes an environmental proxy that retains a signal of the hydrogen-isotopic composition of ancient precipitation. This isotopic composition thus helps to elucidate the combined climatic and tectonic processes associated with topographic growth, which ultimately controls the spatial patterns of precipitation in mountain belts. However, between 25.5 and 27°S present-day river-based hydrogen-isotope lapse rates are very low, possibly due to deep-convective seasonal storms that dominate runoff. If not accounted for, the effects of such conditions on moisture availability in the past may lead to misinterpretations of proxy-records of rainfall. Here, we present hydrogen-isotope data of volcanic glass (δDg), extracted from 34 volcanic ash layers in different sedimentary basins of the Eastern Cordillera and the Sierras Pampeanas. Combined with previously published δDg records and our refined U-Pb and (U-Th)/He zircon geochronology on 17 tuff samples, we demonstrate hydrogen-isotope variations associated with paleoenvironmental change in the Angastaco Basin, which evolved from a contiguous foreland to a fault-bounded intermontane basin during the late Mio

  3. Daily rainfall variability over northeastern Argentina in the La Plata River basin.

    García, Norberto O; Pedraza, Raúl A


    We did a brief description of the climatic behavior and after this we analyzed the temporal variation in the total number of days a year with rainfall and the number of days a year with rainfall above the 100 mm threshold at the rain gauging stations in northeastern Argentina south of the La Plata River basin. The results show an increase both in the frequency of daily rainfall, especially during the winter season, and the frequency of days with heavy rainfall starting in the early 1970s. The increase in frequency of occurrence is more significant in the case of heavy rainfall. The annual maximum rainfall was calculated for periods of 1, 3, 5, 7, and 10 consecutive days at regional rain gauging stations for the respective historical periods, and the rain intensity-duration-return period curves (IDT) were determined on a frequency analysis. The IDT curves were compared with rainfall intensity-duration data of critical storms occurring in the last decades. We noticed that the rain intensities of critical storms (mostly convective) widely exceeded the intensities given by the 100-year IDT curves, particularly for short durations. The increase in both the frequency of heavy rainfall occurrence and rain intensity from the 1970s onward shows an increase in frequency and intensity of the meso-scale convective systems in the region resulting from climatic change. These systems tend to produce rainfall of very high intensity that is spatially concentrated and which generally produces significant floods in the local rivers. PMID:19076421

  4. Late Quaternary stratigraphy, sedimentology, and geochemistry of an underfilled lake basin in the Puna (north-west Argentina)

    McGlue, Michael M.; Cohen, Andrew S.; Ellis, Geoffrey S.; Kowler, Andrew L.


    Depositional models of ancient lakes in thin-skinned retroarc foreland basins rarely benefit from appropriate Quaternary analogues. To address this, we present new stratigraphic, sedimentological and geochemical analyses of four radiocarbon-dated sediment cores from the Pozuelos Basin (PB; northwest Argentina) that capture the evolution of this low-accommodation Puna basin over the past ca. 43 cal kyr. Strata from the PB are interpreted as accumulations of a highly variable, underfilled lake system represented by lake-plain/littoral, profundal, palustrine, saline lake and playa facies associations. The vertical stacking of facies is asymmetric, with transgressive and thin organic-rich highstand deposits underlying thicker, organic-poor regressive deposits. The major controls on depositional architecture and basin palaeogeography are tectonics and climate. Accommodation space was derived from piggyback basin-forming flexural subsidence and Miocene-Quaternary normal faulting associated with incorporation of the basin into the Andean hinterland. Sediment and water supply was modulated by variability in the South American summer monsoon, and perennial lake deposits correlate in time with several well-known late Pleistocene wet periods on the Altiplano/Puna plateau. Our results shed new light on lake expansion–contraction dynamics in the PB in particular and provide a deeper understanding of Puna basin lakes in general.

  5. A new species of Androlaelaps (Acari: Parasitiformes) from the akodontine rodent Deltamys kempi Thomas, 1919, in La Plata River Basin, Argentina.

    Lareschi, Marcela; Gettinger, Donald


    Androlaelaps maurii , a new species of laelapine mite, is described on the basis of female specimens collected from the pelage of the akodontine rodent, Deltamys kempi, from La Plata River basin in Argentina. Androlaelaps maurii can be differentiated from closely related species by its smaller size, the differing distribution of setae in the dorsal shield, and an unarmed opithogaster. This mite appears to be host specific to D. kempi and occurs on this rodent throughout its distribution in Argentina and Uruguay. PMID:19530889

  6. Depositional history of the Upper Triassic Kapp Toscana Group on Svalbard, Norway, inferred from palynofacies analysis and organic geochemistry

    Mueller, Steven; Veld, Harry; Nagy, Jenö; Kürschner, Wolfram M.


    Upper Triassic sediments in the Svalbard Archipelago were deposited in several transgressive-regressive cycles. Understanding their deposition and distribution is of vital importance because of their potential as hydrocarbon reservoir rocks. In this study we integrate palynofacies with organic geochemistry in order to reconstruct the depositional environment of the upper Botneheia Fm up to the lower the Knorringfjellet Fm from two sections located in central Spitsbergen, for which distinctive palynofacies zones have been distinguished. These are mainly terrestrially dominated but occasionally contain amorphous organic matter and marine palynomorphs. Rock-Eval pyrolysis reveals overall mature kerogen type III/IV samples. Our results indicate that at least partially restricted marine conditions prevailed during deposition of the Botneheia Fm. The Botneheia Fm is overlain by a regressive cycle from the lower part of the Tschermakfjellet Fm up to the top of the De Geerdalen Fm with terrestrially dominated palynofacies assemblages. The Knorringfjellet Fm contains increased marine palynofacies and marine dinoflagellate cysts, which is in accordance with a transgression at the base of this unit. This study integrates for the first time in the Spitsbergen area quantitative palynofacies and sedimentary organic matter characterization, and shows the generally accepted paleo-environmental development for the Svalbard Archipelago.

  7. Sand dispersal in the southeastern Austral Basin, Tierra del Fuego, Argentina: Outcrop insights from Eocene channeled turbidite systems

    Torres Carbonell, Pablo J.; Olivero, Eduardo B.


    We made a detailed facies analysis of well exposed Eocene foredeep and wedge-top successions in the SE Austral Basin of eastern Tierra del Fuego, Argentina, contributing to a better understanding of its patterns of sand dispersal. The analysis reveals that these successions constitute portions of turbidite systems with recurrent facies associations, interpreted as channel, channel-margin and levée depositional elements. The channel facies, paleocurrents and interpreted paleogeography suggest that the studied successions form the transfer zone of the turbidite systems that fed the foreland basin. We hypothesize that the SE Austral Basin, which forms the transition between the Austral and Malvinas Basins, acted as an east-west conduit for sediments sourced at the Fuegian Andes and transported to a deeper depositional zone in the SW Malvinas Basin. The fill of the channels in the transfer zone involved a large amount of turbidity flows, which in addition to the evidence of levée confinement in the studied deposits suggests that the sandier portion of the flows was able to reach the depositional zone, were mostly unconfined (sheeted) sand bodies may have formed. In addition, overbank sand bodies were deposited within the transfer zone, associated to processes of flow overspill. Both types of sand bodies constitute potential reservoirs in this hydrocarbon producing basin, implying that the Eocene SE Austral Basin, and the ultimate zone of deposition in the SW Malvinas Basin may constitute major prospects for hydrocarbon exploration. The proposed model define a new perspective for future research on the sedimentologic and stratigraphic evolution of the SE portion of the Austral Basin.

  8. Freshwater actinopterygians of the Los Rastros Formation (Triassic, Bermejo Basin, Argentina

    A. López-Arbarello


    Full Text Available The present paper includes detailed descriptions of all fossil fishes known from the Los Rastros Formation (Ladinian; Bermejo Basin, Argentina. Four taxa are identified: Gualolepis carinaesquamosa  n. gen. n. sp., Rastrolepis  n. gen. with two species R . riojaensis n. sp. and R. latipinnata n. sp., and Challaiaelongata n. comb. Gualolepis  n. gen. and Rastrolepis n. gen. are incertae sedis actinopterygians. The opercular bones of Gualolepis resemble those in peipiaosteid acipenseriforms and the fish might be related with the Chondrostei. The most distinctive features of Rastrolepis are the narrow opercular region and the presence of a very large plate-like branchiostegal bone resembling the condition in the Redfieldiiformes. Challaiaelongata, originally described in the Australian genus Myriolepis, is here refered to the genus Challaia, previously known from the nearby Cuyo Basin and representing the first fish taxon common to both continental sequences. Furthermore, Challaia is shown to be a member of the Acrolepidae and represents the youngest record of the family in Gondwana. Alle fossilen Fische, die bisher von der Los Rastros Formation (Ladin; Bermejo-Becken, Argentinien bekannt sind, werden im Detail beschrieben. Vier Taxa können identifiziert werden: Gualolepis carinaesquamosa  n. gen. n. sp., Rastrolepis  n. gen., mit zwei Arten, R . riojaensis  n. sp. und R . latipinnata  n. sp., und Challaiaelongata comb. nov. Gualolepis  n. gen. und Rastrolepis  n. gen. Actynopterygier unsicherer systematischer Stellung. Die Operkular-Knochen von Gualolepis ähneln jenen der peipiaosteiden Acipenseriformen und das Taxon mag mit den Chondrostei verwandt sein. Die auffälligsten Merkmale von Rastrolepis sind die sehr schmale Operkularregion und das Vorhandensein eines sehr großen, plattigen Branchiostegale, das dem Zustand in Redfieldiiformen ähnelt. Challaiaelongata, ursprünglich zu der

  9. Landscape response to late Pleistocene climate change in NW Argentina: Sediment flux modulated by basin geometry and connectivity

    Schildgen, Taylor F.; Robinson, Ruth A. J.; Savi, Sara; Phillips, William M.; Spencer, Joel Q. G.; Bookhagen, Bodo; Scherler, Dirk; Tofelde, Stefanie; Alonso, Ricardo N.; Kubik, Peter W.; Binnie, Steven A.; Strecker, Manfred R.


    Fluvial fill terraces preserve sedimentary archives of landscape responses to climate change, typically over millennial timescales. In the Humahuaca Basin of NW Argentina (Eastern Cordillera, southern Central Andes), our 29 new optically stimulated luminescence ages of late Pleistocene fill terrace sediments demonstrate that the timing of past river aggradation occurred over different intervals on the western and eastern sides of the valley, despite their similar bedrock lithology, mean slopes, and precipitation. In the west, aggradation coincided with periods of increasing precipitation, while in the east, aggradation coincided with decreasing precipitation or more variable conditions. Erosion rates and grain size dependencies in our cosmogenic 10Be analyses of modern and fill terrace sediments reveal an increased importance of landsliding compared to today on the west side during aggradation, but of similar importance during aggradation on the east side. Differences in the timing of aggradation and the 10Be data likely result from differences in valley geometry, which causes sediment to be temporarily stored in perched basins on the east side. It appears as if periods of increasing precipitation triggered landslides throughout the region, which induced aggradation in the west, but blockage of the narrow bedrock gorges downstream from the perched basins in the east. As such, basin geometry and fluvial connectivity appear to strongly influence the timing of sediment movement through the system. For larger basins that integrate subbasins with differing geometries or degrees of connectivity (like Humahuaca), sedimentary responses to climate forcing are likely attenuated.

  10. Crustal thickness beneath the Chaco-Parana basin, NE Argentina, from surface waves and ambient noise tomography

    Rosa, M.; Collaco, B.; Sanchez, G.; Assumpcao, M.; Sabbione, N.


    We present the results of a study of surface-wave dispersion data obtained by group velocity tomography, using seismic data and ambient seismic noise correlation, for the region of the Chaco-Parana basin, a Neopaleozoic intracratonic basin, formed by a complex history of different processes of subsidence. Previous surface waves analysis (e.g., Feng et al., 2004, 2007; Snokes and James, 1997) estimated Moho depth in the central Chaco basin and a low-velocity anomaly in the lithospheric mantle. However the seismic structure of the crust and upper mantle remains little characterized across the region due to the rather poor resolution, especially for the south region. The aim of this work is to improve the resolution and fidelity of crustal images obtained from traditional earthquake-based measurements. Hence, we have increased the number of group velocity measurements using data from regional earthquakes recorded at LPA (La Plata) station, Brazilian Seismic Network stations (BRASIS), permanent (GSN) and portable (BLSP) stations as well as inter-station dispersion curves derived from a dataset of seismic noise recordings from BRASIS, INPRES stations, LPA, CPUP and TRQA stations. The resulting path coverage is denser and displays a more uniform azimuthally distribution producing better tomographic images. The dispersion curves were obtained by a multiple filter technique (Dziewonski et al, 1969) using a phase-matched filter. A 2D group velocity tomographic inversion was performed, applying a conjugate-gradient method (Paige and Saunders, 1982). The group velocity maps for 10 to 120 seconds correspond very well to tectonic structures throughout the studied area and the resolution was improved in northern Argentina and southern Brazil by the better seismic ray coverage showing low-velocity anomalies in the upper-mantle beneath the Chaco basin, compatible with other dispersion results. The new group velocity maps were inverted for S velocity structures, using a

  11. Biomphalaria tenagophila potencial vector of Schistosoma mansoni in the Paraná River basin (Argentina and Paraguay

    C Edgardo Borda


    Full Text Available Susceptibility and compatibility experiments were carried out with 700 Biomphalaria tenagophila from the Paraná River basin exposed to infection with Schistosoma mansoni. Individual infection was performed with 10 miracidia of SJ2 strain from the Paraiba valley (Brazil originally infective to B. tenagophila. These snails were laboratory-breed progeny of B. tenagophila collected from six localities of Argentina and one from Paraguay. From Argentina: Rincón de Vences (7% and Posadas (11% became infected with S. mansoni and the calculation of Frandsen's index (TCP/100 shows that they were Class II poorly compatible. Those snails from Goya (22%, Maloyas (5%, and Berón de Astrada (3% were Class III compatible to the S. mansoni. None of the 100 snails exposed from Caá-Catí became infected (Class 0 incompatible. Tested samples from Paraguay (Encarnación were infected (20% and compatible (Class III. It was also studied the persistence of the infection in 244 snails of the first generation (F1 of those that were susceptible from three places. It was demonstrated an increment of the susceptibility in the F1 from Maloyas (chi2 = 27.22; p = 0.0001 and Posadas (chi2 = 4.24; p = 0.04. The results point out the possibility that schistosomiasis might be able to spread into the Paraná River basin where B. tenagophila exists.

  12. New Constraints on the Timing and Magnitude of Deformation and Basin Exhumation in the Eastern Cordillera of NW Argentina.

    Trimble, J. D.; Carrapa, B.; Stockli, D. F.; Stutz, J.


    The Angastaco Basin is a ~20km wide and ~6km thick intramontane basin within the Eastern Cordillera (EC) of NW Argentina. The basin is bounded to the east and west by reverse faults that put basement rocks of the Paleozoic Puncoviscana and Cretaceous Santa Barbara Group on top of the Cenozoic sequence. Numerous faults and folds disrupt the basin internally. Some, if not most, of these structures seem to be the result of reactivation of previous normal faults related to the Salta Rift (Carrera et al. , 2006). Recent structural and thermochronological data from the EC of Argentina suggest tectonic deformation in the Eocene-Miocene (e.g., Coutand et al., 2006; Hogn et al., 2007). Data from the EC in Bolivia suggest that deformation ceased by ca. 10.7 Ma (McQuarrie et al., 2005). Therefore, different challenging questions remain open such as: (1) Are all the structures observed in the basin and along its margin a result of reactivation? (2) When was the timing and what was the magnitude of deformation within the basin and surrounding region? New detailed mapping and cross-sections in the Angastaco Basin reveal a number of faults and folds never before documented, including several km-scale west vergent folds interspersed with a complex arrangement of smaller, more angular, east-vergent faults and folds. Clear influence from both east and west-vergent deformation within the basin suggests interplay between the eastward propagation of EC related structures and westward reactivation of Santa Barbara System structures. A lack of structural continuity across the roughly E-W trending portions of Rio Calchaqui suggests that the river follows one or more unexposed strike- slip faults as it cuts across the Tertiary section from W to E. Minor offsets and lack of lateral continuity suggest that these faults are likely tear-faults coeval with deformation in the basin, although they may have been active during multiple pulses of tectonism. With an east-west trend, these structures

  13. Organic facies and palynofacies: Nomenclature, classification and applicability for petroleum source rock evaluation

    Ercegovac, Marko [Serbian Academy of Sciences and Arts, 11000 Belgrade, Knez Mihailova 35 (Serbia and Montenegro); Kostic, Aleksandar [University of Belgrade, Faculty of Mining and Geology, 11000 Belgrade, Djusina 7 (Serbia and Montenegro)


    The basic aim of the investigation presented in this paper was to determine all relevant petrographical and geochemical characteristics of organic facies and their correlation with the lithological composition, sedimentation conditions and paleoenvironments. Application of geological and geochemical methods gives new insight into problems concerning determination of the potential and efficiency of petroleum source rocks. In making the qualitative and quantitative analyses of organic matter in this study various analytical methods were used (whole rock samples, kerogen concentrates; transmitted and reflected normal and fluorescent light). The type of organic facies was used as a criterion for the identification, accumulation and transformation of the organic matter. Paleobotanical studies of organic facies and palynofacies were used to identify types of vegetation and draw conclusions concerning the sedimentary environment. Various types of organic facies and palynofacies were classified in relation to the origin of the organic matter. All sedimentary organic constituents of continental (huminite/vitrinite, inertinite, cuticle, wood fragments, tracheids, spores and pollen) and marine (mostly autochthonous-dinocysts, algae, foraminifera test linings, acritarchs and amorphous organic matter) origin have been grouped according to different classification systems. A summary of these classifications is proposed, with remarks on approximate corresponding coal macerals and selected kerogen types. (author)

  14. First teuthid cephalopod from the Lower Jurassic of South America (Neuquén Basin, Argentina)

    A.C. Riccardi


    A new species of squid, Teudopsis jeletzkyi n. sp., is described from the Toarcian (Lower Jurassic) of the Los Molles Formation in Neuquen Province, central west Argentina. Fossil squids have thus far been unknown in the Mesozoic of South America. This species is the first record of the Order Teuthida in the Jurassic of South America.

  15. The late Paleozoic palynological diversity in southernmost Paraná (Uruguay), Claromecó and Paganzo basins (Argentina), Western Gondwana

    Beri, Ángeles; Gutiérrez, Pedro R.; Balarino, M. Lucía


    This study explores the changes in palynoflora diversity of the late Paleozoic in boreholes DI.NA.MI.GE. 254 (26 samples) and DI.NA.MI.GE. 221 (14 samples) of the Paraná Basin in Uruguay and in 18 surface samples of the La Deheza Formation (Paganzo Basin) and 10 samples of borehole UTAL.CMM1.La Estrella.x-1 (Claromecó Basin) in Argentina. Possible relationships among biostratigraphic zones, diversity levels, facies and climatic evolution patterns in Western Gondwana are studied. Diversity curves of boreholes 221 and 254 and the La Deheza Formation outcrop exhibit similar diversity evolution patterns, i.e., an increase in lower strata diversity and a decrease in upper strata diversity. The disappearance events are determined to be more prominent in biozones of the Cisuralian to the Guadalupian age and less prominent in biozones of the early Cisuralian age. The number of genera raises from the glaciomarine facies, through the deltaic and the marine facies, up to the shallow marine or lagoon facies, in which the disappearance rates become more prominent. . The diversity of the lower part of the La Estrella borehole is lesser than that of the other sequences These diversity, disappearance and appearance behaviors may reflect post-glacial climatic amelioration patterns and the beginning of an arid phase.

  16. Seismo-stratigraphic evolution of the northern Austral Basin and its possible relation to the Andean tectonics, onshore Argentina.

    Sachse, Victoria; Anka, Zahie; Pagan, Facundo; Kohler, Guillermina; Cagnolatti, Marcelo; di Primio, Rolando; Rodriguez, Jorge


    The Austral Basin is situated in a formerly and recently high active tectonic zone in southern Argentina. The opening of the South Atlantic to the east, the opening of the Drake Passage in the south, and the subduction related to the rise of the Andes to the west, had major influence on the study area. To identify the impact of the tectonic events on basin geometry, sediment thickness and depocenter migration through time, 2D seismic interpretation was performed for an area of approx. 180.000 km² covering the onshore northern Austral Basin. A total of 10 seismic horizons were mapped and tied to the stratigraphy from well reports, representing 9 syn- and post- rift sequences. The main units are: Basement (U1), Jurassic Tobifera Formation (U2), Early Cretaceous (U3), Late Cretaceous (U4), sub-unit Campanian (U4A), Paleocene (U5), Eocene (U6), Oligocene (U7), Miocene (U8), and Plio-Pleistocene (U9). Main tectonic events are identified representing the break-up phase forming graben systems and the evolution from the ancient backarc Rocas Verdes Basin to the foreland Austral Basin. Inversion and changes in the tectonic regime are concomitant with onlapping and thinning of the base of the Upper Cretaceous to Campanian sediments, while the Top of the Upper Cretaceous represents a Maastrichtian unconformity. Units depth maps show a triangular geometry since the Jurassic, tracing the north-eastern basement high and deepening to the south. Since the Campanian the former geometry of basin fill changed and deepening to the south stopped. Beginning of the foreland phase is assigned to this time as well as changes in the stress regime. Paleogene times are marked by a relatively high sedimentation rate coupled with enduring thermal subsidence, on-going rise of the Andes and changes in the convergence rates of the Nazca relative to the South American plate. Onset of sediment supply from the Andes (Incaic phase) resulted in enhanced sedimentation rates during the Paleocene

  17. Mid Jurassic (Late Callovian) dinoflagellate cysts from the Lotena Formation of the Neuquén Basin, Argentina and their palaeogeographical significance

    Riding, James B.; Mirta E. Quattrocchio; Marcelo A. Martinez


    The Lotena Formation from two localities, Picún Leufú and Portada Covunco, in the Neuquén Basin of westcentral Argentina was studied palynologically. The material examined produced moderately diverse Late Callovian dinoflagellate cyst assemblages. This age assignment is consistent with ammonite evidence. The dinoflagellate cyst floras are reminiscent of the Middle Jurassic associations of northwest Europe and surrounding areas. Marine palynomorphs typical of Australasia and the Ar...

  18. Statistical Seasonal Rainfall Forecast in the Neuquén River Basin (Comahue Region, Argentina)

    Marcela Hebe González


    A detailed statistical analysis was performed at the Neuquén river basin using precipitation data for 1980–2007. The hydrological year begins in March with a maximum in June associated with rainfall and another relative maximum in October derived from snow-break. General features of the rainy season and the excess or deficits thereof are analyzed using standardized precipitation index (SPI) for a six-month period in the basin. The SPI has a significant cycle of 14.3 years; the most severe exc...

  19. Subaqueous landslides at the distal basin of Lago Nahuel Huapi (Argentina): Towards a tsunami hazard evaluation in Northern Patagonian lakes

    Beigt, Débora; Villarosa, Gustavo; Gómez, Eduardo A.; Manzoni, Carolina


    The May 22nd, 1960 Valdivia earthquake, Chile (Mw 9.5) triggered a series of subaqueous mass-wasting processes (debris flows and slides) in Lago Nahuel Huapi (Argentina), generating a tsunami-like wave that hit the coasts of San Carlos de Bariloche. Aiming to provide a first preliminary insight into tsunami hazards for the lakeshore communities, in this paper we identify and characterize the subaqueous landslides at the populated distal basin of the lake. Swath bathymetric and seismic profiling surveys were carried out and high-resolution digital elevation models were derived from these data to perform a landslide inventory map. A series of morphometrical parameters (including the landslide area, the volume of displaced materials and the run-out distance, among others) were estimated upon selected events. The results indicated that landslide activity at the distal basin of Lago Nahuel Huapi has been concentrated in the vicinity of Bariloche (massive landslide triggered by the 1960 earthquake) and within steep delta fronts where the slope failures typically initiate at shallow waters (9-11 m depth). The sliding mass frequently travels basinward along a great distance (≥ 1000 m). At the delta fronts, the volume of material removed by landslides can reach ~ 40 × 104 m3, leaving scar areas of up to 13 m thick. The periodic occurrence of rotational-translational mass movements initiating at the upper edge of the delta fronts, with vertical displacements of the mobilized materials reaching ~ 200 m, probably represents a potential tsunami hazard for the nearby populated coasts.

  20. Lower and Middle Devonian Malvinokaffric ostracods from the Precordillera Basin of San Juan, Argentina

    Salas, María J.; Rustán, Juan J.; Sterren, Andrea F.


    Ostracod from the upper Lower to Middle Devonian rocks of the Argentine Precordillera Basin (Talacasto and Punta Negra formations) are studied. One new genus Pircawayra nov. gen., and five species (including three new: Pircawayra gigantea nov. gen. and sp., Lapazites trinodis nov. sp. and Keslingiella? teresae nov. sp.) are defined. The recorded ostracod fauna closely resembles that coeval from Bolivia and South Africa, exhibiting a remarkable endemism, not only at the genus level, but also at the species level. In addition to its low-diversity, the Malvinokaffric ostracod association is also characterized by having large, thick, coarsely ornamented and swollen valves. The similar ostracod composition from the Andean and South African basins suggests faunal exchange between these two areas. Based on the ostracod faunas, the Malvinokaffric Realm is clearly recognizable at least up to the Middle Devonian.

  1. Hydrologic response of the drainage basins that intersect Las Grutas town, Argentina

    Sibila A. Genchi


    Full Text Available La localidad de Las Grutas está emplazada en una región semiárida, en la costa Noroccidental del Golfo San Matías (Argentina y es intersectada por dos cuencas de drenaje que responden ante eventos de precipitaciones intensas. Estos eventos generan flujos capaces de producir riesgos de inundación local, tal como la inundación de abril de 2004. El objetivo de este trabajo es establecer el comportamiento hidrográfico de dichas geoformas y la manera en el cual los usos de la tierra interactúan con ellas. La falta de registros hidrométricos conduce a explicar y predecir respuestas a través de aproximaciones empíricas como el análisis morfométrico fluvial y el número de curva del Servicio de Conservación del Suelo de los Estados Unidos (1972, apoyados en sistemas de información geográfica. El área en estudio presenta características que favorecen la concentración del escurrimiento en cauces durante eventos extremos. Los segmentos de primer orden juegan un rol importante en la respuesta hidrológica. El efecto de la urbanización produce un efecto adicional del 17.3 y 2.1% de escurrimiento en cada cuenca. El incremento potencial del número de eventos extremos en el futuro debido al cambio climático, podría conducir a mayores perturbaciones en el área urbanizada. Los resultados contribuirán a implementar medidas que mitiguen posibles consecuencias de los peligros de inundación.

  2. The paradigm of paraglacial megafans of the San Juan river basin, Central Andes, Argentina

    Suvires, Graciela M.


    The spatial distribution and several morphometric characteristics of the Quaternary alluvial fans of the San Juan River, in the province of San Juan, at the Central and Western part of Argentina, have been studied to classify them as paraglacial megafans, as well to ratify its depositional environmental conditions. The high sedimentary load exported by San Juan river from the Central Andes to the foreland depressions is estimated about 3,682,200 hm3. The large alluvial fans of Ullum-Zonda and Tulum valleys were deposited into deep tectonic depressions, during the Upper Pleistocene deglaciation stages. The outcome of collecting remotely sensed data, map and DEM data, geophysical data and much fieldwork gave access to morphometric, morphographic and morphogenetic data of these alluvial fans. The main drainage network was mapped on processed images using QGis (vers.2.0.1). Several fan morphometric parameters were measured, such as the size, the shape, the thickness, the surface areas and the sedimentary volume of exported load. The analyzed fans were accumulated in deep tectonic depressions, where the alluvium fill reaches 700 to 1200 m thick. Such fans do not reach the large size that other world megafans have, and this is due to tectonic obstacles, although the sedimentary fill average volume surpasses 514,000 hm3. The author proposes to consider Ullum-Zonda and Tulum alluvial fans as paraglacial megafans. According to the stratigraphic relationships of the tropical South American Rivers, the author considers that the San Juan paraglacial megafans would have occurred in the period before 24 ka BP , possibly corresponding to Middle Pleniglacial (ca 65-24ka BP). They record colder and more humid conditions compared with the present arid and dry conditions.

  3. Statistical Seasonal Rainfall Forecast in the Neuquén River Basin (Comahue Region, Argentina

    Marcela Hebe González


    Full Text Available A detailed statistical analysis was performed at the Neuquén river basin using precipitation data for 1980–2007. The hydrological year begins in March with a maximum in June associated with rainfall and another relative maximum in October derived from snow-break. General features of the rainy season and the excess or deficits thereof are analyzed using standardized precipitation index (SPI for a six-month period in the basin. The SPI has a significant cycle of 14.3 years; the most severe excess (SPI greater than 2 has a return period of 25 years, while the most severe droughts (SPI less than −2 have a return period of 10 years. The SPI corresponding to the rainy season (April–September (SPI9 has no significant trend and is used to classify wet/dry years. In order to establish the previous circulation patterns associated with interannual SPI9 variability, the composite fields of wet and dry years are compared. There is a tendency for wet (dry periods to take place during El Niño (La Niña years, when there are positive anomalies of precipitable water over the basin, when the zonal flow over the Pacific Ocean is weakened (intensified and/or when there are negative pressure anomalies in the southern part of the country and Antarctic sea. Some prediction schemes using multiple linear regressions were performed. One of the models derived using the forward stepwise method explained 42% of the SPI9 variance and retained two predictors related to circulation over the Pacific Ocean: one of them shows the relevance of the intensity of zonal flow in mid-latitudes, and the other is because of the influence of low pressure near the Neuquén River basin. The cross-validation used to prove model efficiency showed a correlation of 0.41 between observed and estimated SPI9; there was a probability of detection of wet (dry years of 80% (65% and a false alarm relation of 25% in both cases.

  4. [Soil texture as a regulating factor of Escherichia coli adsorption in a Rolling Pampa basin (Argentina)].

    Behrends Kraemer, Filipe; Chagas, Celio I; Cosentino, Diego J; Paz, Marta; Moretton, Juan A


    Increase of bovine livestock rates in fragile areas of the Rolling Pampa entails a high risk of biological contamination. This biological contamination is regulated by edaphic variables such as texture, which control biological contaminants transport towards water bodies. In this work bacterial adsorption was correlated with individual particle sizes in 27 soils of a typical basin of the Rolling Pampa with slow centrifugation techniques. Bacterial adsorption values, using E. coli (ATCC 8739), ranged between 25.3 and 73.3% and significant correlation (R² = 0.6) was found between bacterial adsorption and clay content. This correlation was improved when particles smaller than 3 µm were considered (R² = 0.64) highlighting the capacity of very fine silt in adsorption mechanisms. Data obtained were compared with those proposed by Ling et al. (2002), finding similar slope but different intercept. This difference disappeared when a wild strain, isolated from bovine manures present in the basin, was used, since a bacterial adsorption increase of 48% was found. PMID:21731969

  5. Taxonomy, distribution and population structure of invasive Corbiculidae (Mollusca, Bivalvia in the Suquía River basin, Córdoba, Argentina

    Paola B. Reyna


    Full Text Available Invasive species are one of the most significant causes of biodiversity loss and changes in ecosystem services, which underlines the importance of their detection and their study. The Asian clams (Corbiculidae are invasive organisms that accidentally entered the La Plata River, Argentina, presumably in the 1960s. The objectives of the present study were to identify the corbiculid species and to determine their distribution at several locations along the Suquía River basin, an extended area in central Argentina. In addition, population structure was evaluated monthly during one year, at a site in the city of Córdoba that is characterized by high human influence. The presence of Corbicula fluminea (Müller, 1774 and Corbicula largillierti (Philippi, 1844 in the Suquía River basin is reported for the first time. The former species was found only in a lentic environment (San Roque reservoir, while the latter was also found along the tributary rivers and brooks of the basin. Corbicula largillierti showed variations in average density between the different sites and also in biomass and size classes throughout the study period at the site at Córdoba city. The relative composition of the sediments, flow fluctuation and human pollution may be responsible for the observed differences.

  6. Rock Glaciers in the Upper Basin of Bermejo River, Santa Victoria, Argentina

    Ahumada, A. L.; Íbáñez Palacios, G. P.; Toledo, M. A.; Páez, S. V.


    The Bermejo River is an international basin in the Tropical Andes, Santa Victoria range. The Santa Victoria range extend in N-S sense (22°08' and 23°00' South latitude between 65° and 65°30' West longitude). It maxim height is about 5.055 m s.n.m. and it average height is 3000 m s.n.m. There have been localize intact rock glaciers (active and inactive) and relict. The rock glaciers are frozen water reservoir and regulate the water regime in the high mountain over the world. The global warming effects have been express in this region with average annual air temperatures in increase: The series of temperatures of La Quiaca weather station, years 1911-2010, shows an increase about 1° C (from 9,14° C to 10,08° C) since 70' decade to actuality. This study aims to contribute to the survey of intact rock glaciers and the suite of accompanying landforms. The geographic identification and location of rock glaciers have made through the interpretation of aerial photographs and LandSat 7 and Aster Images in comparison with Google Earth using GIS and visual interpretation technics. This information has controlled with fieldwork in several campaigns. The rock glaciers are classified (in base of it activity) in actives, inactives and relict. The first and the second class were grouped in a category called intact rock glaciers for simplify it identification. The unified categories are water-storing. In the fieldwork have determinated the following aspects: 1- Active processes determination (needle ice, lenticular ice formation, etc.) and its sedimentary products: sucrose structure, inverted gradation, extrusion, open work gravels. 2- Location and geomorphologic measurement of rock glaciers and periglacial forms. There are identified 318 intact rock glaciers in high basin of Bermejo river, Sub-basins Condado river, Los Toldos-Lipeo river and Iruya river, Santa Victoria range. The actives rock glaciers, indicators of discontinuous permafrost, are installed from 4300 m s

  7. Exploration and development of the fluvial deposits in the Potrerillos Formation, Cuyana Basin, Mendoza, Argentina

    Fernandez, C.; Agraz, P. [YPF, S.A., Av. San Martin, Mendoza (Argentina)


    In the Barrancas area are located the oil fields related to structures developed in the Oriental axis of the Cuyana Basin. The anticlinal axis of the Barraticas oil field has a NNW-SSE strike and dips toward North. The Oriental flank is abruptly bounded by faulting whilst the Occidental one is gently dipping. The Barrancas oil field was developed between the 1940s and 1960s, having both Early Jurassic conglomerates of the Barrancas Formation and Triassic fluvial braided deposits from Las Cabras Formation as the main targets. The review of new plays within the Triassic fluvial cycles belonging to the Potrerillos Formation was encouraged by the success obtained in the recovery of important volumes of oil from the overlying Formations. The application of a sequence stratigraphy approach to the fluvial settings combined with petrophysics data from outcrop studies and a 3D seismic interpretation allowed a new play concept to be conceived. This new play concept will have application in zones far away from the study area, where Potrerillos Formation has exploration interest. A team integrate by geologists, geophysicists, and engineers has produced new opportunities on mature oil fields with up to 300 drilled wells.

  8. Peritidal cyclic sedimentation from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza, Argentina

    Palma, Ricardo M.; Kietzmann, Diego A.; Bressan, Graciela S.; Martín-Chivelet, Javier; López-Gómez, José; Farias, María E.; Iglesias Llanos, María P.


    The La Manga Formation consists of marine carbonates and represents most of the sedimentary record of the Callovian-Oxfordian in the Neuquén Basin. Three localities in the southern Mendoza province were studied and their cyclicity was determined by means of facies analysis and their vertical arrangement. Facies of inner ramp, that were deposited in extremely shallow-water environments with intermittent subaerial exposures have been broken down into shallow subtidal, and intertidal-supratidal environments. Shallow subtidal facies are arranged into decimetre scale upward-shallowing cycles composed of marls, laminated or massive mudstones or bioclastic wackestones and intraclastic wackestone-packstones. Intertidal-supratidal centimetre-scale cycles consist of an upward-shallowing succession of restricted facies, overlaid by horizontal or crinkle microbial laminites, flat pebble conglomerates or breccias beds. The defined cycles show a shallowing upward trend in which the evidence of relative sea-level lowering is accepted. The interpretation of Fischer plots allowed the recognition of changes in accommodation space.

  9. Determination of risk indices in quarries of two basins in La Plata Municipality Argentina

    Soil extraction is one of the main causes of degradation of this resource in Buenos Aires province. In La Plata municipality, soil is extracted at different depths for a variety of uses. Deep soil extraction creates quarries which have a negative impact on the environment, the landscape, the real estate value and life quality. The inundated quarries become precarious swimming places where many people have drowned. When the quarries are used as garbage dumps, they can concentrate disease vectors or pollute groundwater through their leachates. The face-cuts are often near vertical and can be susceptible to collapse. The methodology to calculate the risk index is based on the hypothesis that risk variables can be identified, individually assessed and combined in such a way that they would provide a numerical value reflecting the likelihood of accidents or diseases occurring as a consequence of quarry's presence. The general objective of the project is to obtain an index for the quarries of the studied basins aimed at warning local authorities and affected persons about the sites where protection and reclamation measures are more urgently needed. The values obtained are represented on a map showing the risk class of each quarry. It is concluded that the methodology is useful to determine priorities and can prove a good management tool for those involved in this problem

  10. Palynofacies characterization for hydrocarbon source rock evaluation in the Subathu Formation of Marhighat, Sirmaur district, Himachal Pradesh

    O P Thakur; N N Dogra


    This paper deals with the hydrocarbon source rock evaluation of the Subathu Formation exposed at Marhighat on Sarahan–Narag road in Sirmaur district of Himachal Pradesh. Hydrocarbon potential of these sediments is estimated on the basis of palynofacies analysis and thermal alteration index (TAI) values based on the fossil spores/pollen colouration. The analyses are based on the classification and hydrocarbon generation potential of plant derived dispersed organic matter present in the sediments. The palynofacies analysis of Subathu Formation in the area reveal moderate to rich organic matter, with amorphous organic matter constituting the bulk of the total organic matter, followed by charcoal, biodegraded organic matter, fungal remains, spores/pollen and structured terrestrial organic matter. The TAI value for the organic matter in these sediments has been ascertained as 3.00. A dominance of the sapropelic facies (amorphous organic matter) and the measured TAI values for the Subathu sediments in the Marhighat area suggests a good source-rock potential for the hydrocarbon generation.

  11. La pesca artesanal en la Cuenca del Plata (Argentina y sus implicancias en la conservación de la biodiversidad Artisanal fish at del Plata basin (Argentina and its implications for the biodiversity conservation

    Juan Miguel Iwaszkiw


    de la pesquería sobre conservación de la biodiversidad de peces de la cuenca.The aim of this contribution is to consider different issues derived from fish captures from artisanal-commercial fisheries in the Paraná Basin in Argentina. We identify certain impacts related to fishing practices on the involved natural populations and its compromises in ichtiofaunal biodiversity conservation. We consider 17 years of information based on data of fisheries exports for different inland species between 1994-2010. These data includes valuable commercial big sized native fishes like sábalo (Prochilodus lineatus, boga (Leporinus obtusidens, tararira (Hoplias malabaricus, surubí (Pseudoplatystoma spp., dorado (Salminus brasiliensis and patí (Luciopimelodus pati, together with several catfish species and minor species as silversides. Freshwater fish exports show a major rise resulting in 331517 ton for these years. The target species is sábalo (88.77 %, other accompanying species are tararira (4.16 %, boga (3.7 % and Patí (1.35 % whereas the remainig catches belong to other species. There is a strong rise in the catches of these other species in certain years while there is not a clear legislation for these fish species that allow implementing a proper fishery management along the basin. The importing countries are Brazil, Colombia, Bolivia and Nigeria among others. Since 2003 Colombia buy an average of 50% of inland fisheries exports from Argentina. The analysis historical data (1994-2010 reveals the need to implement measures to control and management of fisheries and its effects on fish biodiversity conservation in the basin.

  12. Groundwater vulnerability in the Arroyo Feliciano basin. Entre Rios. Argentina; Vulnerabilidad del agua subterranea en la cuenca del Arroyo Feliciano. Entre Rios. Argentina

    Diaz, E. L.; Romero, E. C.; Boschetti, N. G.; Duarte, O. C.


    The study area includes the basin of the Feliciano stream (Arroyo Feliciano) which increasing water resources are affected by the agriculturization rise and the change of soil usage. The 8.199,4 km{sup 2} basin is undergoing a sudden change in the soil usage that goes from an extensive cattle production to intensive rice soybean usage. It has an urban population of approximately 11,600 inhabitants and there are a low number of rural settlers. It is unknown if there is pollution produced by agricultural activity. The objective of this paper is to estimate the pollution vulnerability of the aquifers used for supplying water for human consumption to the towns within the basin; irrigation and watered of animals, fundamentally cattle. There are two internationally standard-considered methods that have been used, known as DRASTIC and GOD, in order to establish the capacity of attenuation of pollutants for elimination, delay and dilution, for agrochemical and fertilizers set in the surface. The outcomes of the application of both methodologies indicate that there is high vulnerability to pollution areas which are in the surroundings of the minor riverbeds and the main course of the Feliciano stream, where the depth to the aquifers is minimal. In the rest of the basin the effect that offers the thickness of the silts and clay of the Hernandarias formation, operates protecting the aquifer. (Author) 12 refs.

  13. U-Pb zircon constraints on the age of the Cretaceous Mata Amarilla Formation, Southern Patagonia, Argentina: Its relationship with the evolution of the Austral Basin

    Despite the abundant fossil content of the Mata Amarilla Formation (Southern Patagonia, Santa Cruz Province, Argentina), its age has always generated a considerable number of questions and debates. The chronological data provided by invertebrates, dinosaurs, fish, turtles, plesiosaurs and fossil flora are contradictory. In this work, twenty U-Pb spot analyses by laser ablation were carried out on the outer parts of the zoned zircon crystals from a tuff layer of the middle section of the Mata Amarilla Formation, yielding a U-Pb concordia age of 96.23±0.71 Ma, which corresponds to the middle Cenomanian. The deposition of the lower section of the Mata Amarilla Formation marks the onset of the foreland stage of the Austral Basin (also known as Magallanes Basin); this transition is characterized by the west-east shift of the depositional systems, which is consistent with the progradation of the Cretaceous fold-and-thrust belt. Thus, the onset of the foreland stage could have occurred between the upper Albian and lower Cenomanian, as the underlying Piedra Clavada Formation is lower Albian in age. On comparing the data obtained with information from the Ultima Esperanza Province in Chile, it can be suggested that the initiation of the closure of the Rocas Verdes Marginal Basin occurred simultaneously

  14. On the Sources of Salinity in Groundwater under Plain Areas. Insights from δ18O, δ2H and Hydrochemistry in the Azul River Basin, Argentina

    The Azul River basin, with some 6200 km2, is located in the plains of Buenos Aires Province, Argentina. The Azul River flows along 160 km from the Tandilia Range, in the SW, to the Channel 11, in the NE. Average annual precipitation is 1005 mm (1988-2000); mean reference evapotranspiration is 1090 mm. The geology consists of Miocene to recent sediments, mostly sands and silts with some clay and calcrete layers, overlying crystalline rocks and marine sediments. The water table is shallow and groundwater in the aquifer upper 30 m displays an increasing salinity from SW to NE. The previous hypothesis to explain the salinity was infiltration of evapo-concentrated surface water, as the small soil slope in the northern basin (< 0.2%) induces rainfall accumulation in lowlands, where water evaporates prior to infiltration. But recent chemical and isotopic data reveal two salinity sources: evaporation of recent recharge water, and mixing with old saline groundwater of yet unknown origin. (author)

  15. Tectonic and paleoenvironmental evolution of Mesozoic sedimentary basins along the Andean foothills of Argentina (32°-54°S)

    Franzese, Juan; Spalletti, Luis; Pérez, Irene Gómez; Macdonald, David


    Chronoenvironmental and tectonic charts are presented for Mesozoic basins located along the Andean foothills of the South American plate. On the basis of the main tectonic events, pre-Andean basins, break-up-related basins, extensional back-arc basins, and Andean foreland basins are recognized. The pre-Andean basins were formed by continental extension and strike-slip movement before the development of the Mesozoic-Cenozoic Andean magmatic arc. Upper Permian to Middle Triassic extension along Palaeozoic terrane sutures resulted in rifting, bimodal magmatism (Choiyoi group), and continental deposition (Cuyo basin). From the Late Triassic to the Early Jurassic, continental extension related to the collapse of the Gondwana orogen initiated a series of long, narrow half-grabens that filled with continental volcaniclastic deposits. These depocenters were later integrated into the Neuquén basin. Coeval development of the shallow marine Pampa de Agnia basin (42-44°S) is related to short-lived extension, probably driven by dextral displacement along major strike-slip faults (e.g. the Gastre fault system). Widespread extension related to the Gondwana breakup (180-165 Ma) and the opening of the Weddell Sea reached the western margin of the South American plate. As a result, wide areas of Patagonia were affected by intraplate volcanism (Chon Aike province), and early rifting occurred in the Magallanes basin. The Andean magmatic arc was almost fully developed by Late Jurassic times. A transgressive stage with starvation and anoxia characterized the Neuquén basin. In western Patagonia, back-arc and intra-arc extension produced the opening of several grabens associated with explosive volcanism and lava flows (e.g. Rı´o Mayo, El Quemado). To the south, a deep marginal basin floored by oceanic crust (Rocas Verdes) developed along the back-arc axis. In mid-to late Cretaceous times, Andean compressional tectonics related to South Atlantic spreading caused the inversion of

  16. U-Pb zircon constraints on the age and provenance of the Rocas Verdes basin fill, Tierra del Fuego, Argentina

    Barbeau, David L.; Gombosi, David J.; Zahid, Khandaker M.; Bizimis, Michael; Swanson-Hysell, Nicholas; Valencia, Victor; Gehrels, George E.


    The Late Jurassic to Early Cretaceous Rocas Verdes basin constitutes one of the most poorly understood components of the southernmost Andes. As a result, accurate reconstructions and interpretations of deformation associated with the Andean orogeny and the kinematics of Scotia arc development also remain poorly constrained. In this data brief, we report U-Pb zircon ages from sandstones of the Rocas Verdes basin fill and from a crosscutting pluton in the southernmost Andes of Argentine Tierra del Fuego. Detrital samples contain predominant Early to early Middle Cretaceous (circa 130-105 Ma) U-Pb zircon age populations, with very small or single-grain middle Mesozoic and Proterozoic subpopulations. A very small subpopulation of Late Cretaceous ages in one sample raises the unlikely possibility that parts of the Rocas Verdes basin are younger than perceived. A sample from a crosscutting syenitic pegmatite yields a crystallization age of 74.7 +2.2/-2.0 Ma. The data presented herein encourage further geochronologic evaluation of the Rocas Verdes basin in order to better constrain the depositional ages and provenance of its contents.

  17. Inverse modelling of the reversely magnetized, shallow plumbing system hosting oil reservoirs of the Auca Mahuida volcano (Payeina retroarc, Neuquén Basin, Argentina)

    Paine, John; De Ritis, Riccardo; Ventura, Guido; Longo, Mariana; Ravat, Dhananjay; Speranza, Fabio; Chiappini, Massimo


    The Auca Mahuida volcano (2.03-0.88 Ma) located east of the Andean thrust front in the Neuquén basin (Argentina) hosts an oil system of thermogenic origin and is affected by the NW-SE striking-faults. Intrusive bodies and the underlying Jurassic sediments constitute the reservoir rocks. Aeromagnetic data collected in the Auca Mahuida area detected multiple dipolar magnetic anomalies, many of which have reverse polarity. Palaeomagnetic measurements on rock samples collected in the field together with available age determinations indicate that the reversely magnetized sources were mainly emplaced during the Matuyama reverse polarity chron while the normal polarity sources were emplaced during the Olduvai and/or Jaramillo subchrons. The location and geometry of the intrusive bodies is poorly known and the customary magnetic inversion is rendered difficult because of multiple natural remanent magnetization directions. To address these difficulties, a voxel inversion was applied to model the vector residual magnetic intensity (VRMI) transformation of the observed total magnetic intensity data. The modelling showed a 1.5 km deep, subcircular ring-shaped intrusion below the summit of the volcano and a series of NW-SE elongated, fault-controlled intrusive bodies to depths up to 3-4 km. Our results show that magnetic data and VRMI modelling help resolve the geometry of the shallow plumbing system of volcanoes with remanently magnetized sources, and estimate the depth and geometry of potential oil reservoirs in volcanic areas.

  18. Multiple biomarkers responses in Prochilodus lineatus allowed assessing changes in the water quality of Salado River basin (Santa Fe, Argentina)

    Cazenave, Jimena, E-mail: [Laboratorio de Ictiologia, Instituto Nacional de Limnologia (INALI-CONICET-UNL), Paraje El Pozo, Ciudad Universitaria UNL, 3000 Santa Fe (Argentina); Bacchetta, Carla; Parma, Maria J.; Scarabotti, Pablo A. [Laboratorio de Ictiologia, Instituto Nacional de Limnologia (INALI-CONICET-UNL), Paraje El Pozo, Ciudad Universitaria UNL, 3000 Santa Fe (Argentina); Wunderlin, Daniel A. [Dto. Bioquimica Clinica-CIBICI-CONICET, Facultad de Ciencias Quimicas, Universidad Nacional de Cordoba, Haya de la Torre esq Medina Allende, Ciudad Universitaria, 5000 Cordoba (Argentina)


    This field study assessed water quality of Salado River basin by using a set of biomarkers in the fish Prochilodus lineatus. Multiple biomarkers were measured, including morphological indexes (condition factor, liver somatic index), hematological (red and white blood cells) and biochemical (glucose, total protein and cholinesterase activity) parameters. Besides, detoxication and oxidative stress markers (antioxidant enzymes, lipid peroxidation) were measured in liver, gills and kidney. Despite water quality assessment did not show marked differences among sites, biomarkers responses indicate that fish are living under stressful environmental conditions. According to multivariate analysis glucose, glutathione S-transferase activity, lipid peroxidation levels and the count of white blood cells are key biomarkers to contribute to discrimination of sites. So, we suggest use those biomarkers in future monitoring of freshwater aquatic systems. - A battery of biomarkers was successfully applied to assess the health of the fish Prochilodus lineatus from Salado River basin.

  19. Multiple biomarkers responses in Prochilodus lineatus allowed assessing changes in the water quality of Salado River basin (Santa Fe, Argentina)

    This field study assessed water quality of Salado River basin by using a set of biomarkers in the fish Prochilodus lineatus. Multiple biomarkers were measured, including morphological indexes (condition factor, liver somatic index), hematological (red and white blood cells) and biochemical (glucose, total protein and cholinesterase activity) parameters. Besides, detoxication and oxidative stress markers (antioxidant enzymes, lipid peroxidation) were measured in liver, gills and kidney. Despite water quality assessment did not show marked differences among sites, biomarkers responses indicate that fish are living under stressful environmental conditions. According to multivariate analysis glucose, glutathione S-transferase activity, lipid peroxidation levels and the count of white blood cells are key biomarkers to contribute to discrimination of sites. So, we suggest use those biomarkers in future monitoring of freshwater aquatic systems. - A battery of biomarkers was successfully applied to assess the health of the fish Prochilodus lineatus from Salado River basin.

  20. Characterization of black volcanites from the Limay river basin, Patagonia, Argentina, using energy dispersive X-ray fluorescence spectrometry: an aid to infer human group mobility

    The investigation of hunter-gatherers archaeological sites in the Limay river basin, Patagonia, Argentina, raised questions concerning the lithic technology. The chemical characterization of artifacts, rocks and possible sources of provenances could help to elucidate the hunter-gatherer mobility. In three archaeological sites-Rincon Chico 2 (RCh2/87; 14C 710 ± 60 BP), Cueva Traful I (CTI; 14C 9430 ± 230 BP) and Casa de Piedra de Ortega (CPO; 14C 2840 ± 80 BP), tools and debitage or discarded flakes made in black volcanic rock have been found. Nearby an extensive rock outcrop of black volcanite, Paso Limay quarry (CPL), with similar characteristics was located. Samples coming from these four sites were analyzed by energy dispersive X-ray fluorescence spectrometry. This characterization allowed the geochemical classification of the lithic material and to correlate the samples with the suspected source after a previous statistical analysis. The majority of the samples were classified as dacites and rhyolites. Only samples coming from CPO site, the closest place to CPL were made exclusively with the quarry rocks. A set of five samples from RCh2/87 and two samples from CTI appear to have same chemical composition as CPL in spite of this site is placed in the opposite bank of the Limay river suggesting that hunter-gatherers could accede to the quarry, eventually. Finally, only a set of five samples coming from RCh2/87 and CTI do not group with the quarry. This fact evidences the existence of secondary sources of supply. The information of this research allowed inferring ancient human mobility patterns in the region. (author)

  1. Histopathological changes in the gills and liver of Prochilodus lineatus from the Salado River basin (Santa Fe, Argentina).

    Troncoso, Ileana C; Cazenave, Jimena; Bacchetta, Carla; Bistoni, María de Los Angeles


    This study evaluated the histopathological changes in gills and liver of Prochilodus lineatus inhabiting the Salado River basin. Fish were collected in four different sampling stations. The histological lesions in the tissues were examined under light microscopy and evaluated with quantitative analyses. The morphometric analysis of the gills showed a significant shortening of secondary lamellae and a lower percentage of area for gas exchange in fish from station 1 (an urban area, located near the mouth of the Salado River) in comparison with fish gills from the reference site (station 4, a relatively pristine area). Moreover, a significantly higher area occupied with necrotic foci and the occurrence of an important inflammatory response were observed in fish liver of station 1 than the samples caught from other stations. Thus, histopathological evidences showed differences among sites, which could be related to different environmental conditions. PMID:21850399

  2. Integrated survey of water pollution in the Suquía River basin (Córdoba, Argentina).

    Monferrán, Magdalena Victoria; Galanti, Lucas Nicolás; Bonansea, Rocío Inés; Amé, María Valeria; Wunderlin, Daniel Alberto


    We report a combined two-year seasonal monitoring of Suquía River basin using both chemical parameters and biomarkers measured in Jenynsia multidentata, aiming to correlate external levels of contaminants with the response of oxidative stress biomarkers in this fish. Identified pollution sources correspond to city sewage as well as agricultural and small industry activities downstream from Córdoba city. Physicochemical parameters integrated into a water quality index (WQI) were measured in Suquía River during dry and wet seasons. Ag, Mn, Cu, Cr, Ni, Fe, Pb and Zn were also monitored in water and sediment samples. Biomarkers include detoxication and antioxidant enzymes: catalase (CAT), glutathione peroxidase (GPX), glutathione S-transferase (GST) and glutathione reductase (GR). Enzymes showed a pollution dependent response, with increased activities in fish collected close to the sewage exit and progressive drop further downstream, matching changes in the Water Quality index. The combined use of biomarkers with water quality parameters allowed both the identification of pollution sources and the evaluation of effects of contaminants on the aquatic biota. PMID:21152656

  3. Meltwater palaeohydrology of the Baker River basin (Chile/Argentina) during Late Pleistocene deglaciation of the Northern Patagonia Icefield

    Thorndycraft, Varyl; Bendle, Jacob; Benito, Gerardo; Sancho, Carlos; Palmer, Adrian; Rodríguez, Xavier


    The Late Pleistocene deglaciation of the Northern Patagonia Icefield (NPI) was characterised by rapid ice sheet thinning and retreat, and the development of large proglacial lake systems characterised by continental scale drainage reversals. In this region, research has focused primarily on the identification of former ice-limits (e.g. moraine ridges) for geochronological analyses, with little attention given to the meltwater palaeohydrology of major river valleys. The Baker River catchment drains the majority of the eastern ice shed of the NPI, with a basin area of 29,000 km2 that includes the large transboundary lakes of General Carrera/Buenos Aires and Cochrane/Puerreydón. The Baker River valley is aligned north to south, crossing the east-west valleys of the main NPI outflow glaciers, and thus represents an important aspect of regional Late Pleistocene palaeogeography. The Baker River valley therefore has the potential to refine regional models of deglaciation through better understanding of relationships between glacier dynamics, ice dammed lakes and meltwater pathways. Here we present geomorphological mapping from the Atlantic-Pacific drainage divide (over 150 km east of the Cordillera) to the lower Baker valley, in order to reconstruct Late Pleistocene palaeohydrology. We provide new mapping of palaeolake shoreline elevations and evidence for glacial lake outburst flood (GLOF) pathways that require a re-evaluation of the currently accepted palaeogeographic models. For example, the palaeohydrological evidence does not support existing models of a unified Buenos Aires/Puerreydón mega-lake at ca. 400m elevation. We propose a relative chronology of palaeohydrological events that help refine the published moraine chronology derived from cosmogenic nuclide exposure dating. Controls on Late Pleistocene meltwater palaeohydrology of the Baker catchment are discussed, including the interplay of glacial processes and regional tectonics, in particular, dynamic

  4. Datafile: Argentina

    Consideration is given to modern state and prospects of development of nuclear power in Argentina, the role and tasks of regulating bodies, specific features of fuel cycle, international relations and nuclear safequards. The first NPP was put in operation in 70-s. Technical and economical indices of Atucha-1 NPP were among the best in the world till 1983, the total load factor was equal to 75%. Later on the load factor decreased down to 67% for different reasons. In 1988 the power plant was shutdown. Argentina cooperates with many countries including Brazil, Cuba, Turkey, Nigeria and Algeria. Negotiations about drawing up conditions of including Argentina NPPs into the system of nuclear safeguides are carried on with IAEA

  5. Dolomitized tidal cycles in the Agua de la Mula member of the Agrio formation (Lower Cretaceous, Neuquén Basin, Argentina

    Maisa A. Tunik


    Full Text Available The Agrio Formation (Valanginian to early Barremian is a siliciclastic and carbonate unit of the Neuquén Basin in west central Argentina. A conspicuous 20 m thick dolomitized section near the top of the upper Agua de la Mula Member of the Agrio Formation was identified for the first time in this unit. The analyzed section is composed of dolostones with scarce siliciclastic intercalations. A tidal flat environment with highfrequency cycles is suggested for the measured section. Petrography, SEM, X-Ray, EDAX and cathodoluminiscence analyses showed two different dolomitization processes. The first one comprises early mimetic and non mimetic dolomitization on ooids, bioclasts and early marine cements. The second one reveals precipitation of dolomite cement. The mimic dolomitization indicates that this process took place before the inversion from aragonite to calcite, or from low magnesium calcite to high magnesium calcite. The dolomitization should have been soon after the deposition. The presence of dolomite cement is probably related to a high concentration of Mg2+ coming from sea water flushing into highly porous sediments mixed with fresh waters from the continent. This is suggestive of a change of diagenetic environment from marine to meteoric, probably during sea level changes. A model that explains these processes is the shallow seawater dolomitization model. This model proposes that dolomitization is triggered by the drive of large amount of seawaters through the sediments.La Formación Agrio es una unidad clásica del Cretácico Inferior de la Cuenca Neuquina que se depositó en un ambiente de rampa carbonática con influencia mareal. Por primera vez para esta unidad se describe en el área de Mina La Continental, un espesor de casi 20 m de bancos dolomitizados. Estas rocas son grainstones y packstones con distintos tipos de dolomitización. Los análisis petrográficos, de SEM, EDAX, rayos X y de cátodoluminiscencia han permitido

  6. Rafaela, Argentina

    Omar Perotti


    Brinda información acerca de la provincia de Rafaela, Argentina. Da a conocer el planeamiento estratégico de Rafaela, los temas a resolver con el sector privado, así como las acciones para abordar la relación público-privada.

  7. Argentina; Argentine



    This economical study summarizes the energy situation of Argentina: energy institutions and policy, energy companies (oil, electricity, gas, coal), energy supplies (resources, power production, petroleum, natural gas), prices and tariffs, consumption, economical stakes and perspectives (investments, agreements, projects). Energy data for the 1971-1999 period are summarized in graphs and tables. (J.S.)

  8. Sedimentitas marinas de la Formación Barranca Final (Mioceno medio-superior de la cuenca del Colorado, aflorantes en el sureste de la provincia de La Pampa, Argentina Marine sediments of the Barranca Final Formation (Middle-Upper Miocence of the Colorado Basin in south-east La Pampa province, Argentina

    G. Visconti


    Full Text Available En este trabajo se describen sedimentitas carbonáticas, silicoclásticas y evaporíticas del Mioceno de la cuenca del Colorado, aflorantes en el sureste de la provincia de La Pampa, Argentina. Sobre la base de la litología, las estructuras sedimentarias y los fósiles se identificaron siete facies y dos asociaciones de facies, correspondientes a ambientes marino somero (intermareal a supramareal y fluvial, para las secciones analizadas. Las sedimentitas marinas infrayacen a las areniscas fluviales de la Formación Río Negro y se consideran correlacionables con las sedimentitas de la Formación Barranca Final (Mioceno medio-superior, depositadas en la cuenca del Colorado durante la transgresión "Entrerriense". El hallazgo de estos niveles confirma la presencia de este mar en el sureste de la provincia de La Pampa.This paper describes Miocene carbonatic, siliciclastic and evaporitic sedimentary rocks of the Colorado Basin, from southeast of La Pampa Province, Argentina. Seven facies and two facies assemblages of shallow marine (intertidal and supratidal settings and fluvial environments are inferred on the basis of lithology, sedimentary structures, and fossil content. The thin marine level underlies the fluvial sandstones of the Río Negro Formation, and is considered contemporary with the Barranca Final Formation (middle-upper Miocene, of the Colorado Basin, which is the depositional record of the "Entrerriense" transgression. The occurrence of these sedimentary rocks confirms the presence of the "Entrerriense" sea in the south-east of La Pampa Province during the Miocene.

  9. Application of organic facies in sedimentological-stratigraphical model of the Oligo-Miocene and Miocene of the Campos Basin; Aplicacao da faciologia organica no modelo sedimentologico-estratigrafico do Oligo-Mioceno e Mioceno da Bacia de Campos

    Mendonca Filho, Joao Graciano; Mendonca, Joalice de Oliveira; Oliveira, Antonio Donizeti de; Torres, Jaqueline [Universidade Federal do Rio de Janeiro (UFRJ). Centro de Ciencias Exatas e da Natureza. Inst. de Geociencias (Brazil)], e-mails:,,,; Menezes, Taissa Rego [Centro de Pesquisas da Petrobras (CENPES), RJ (Brazil). P e D em Geociencias. Gerencia de Geoquimica], e-mail:; Santos, Viviane Sampaio Santiago dos; Arienti, Luci Maria [Centro de Pesquisas da Petrobras (CENPES), RJ (Brazil). P e D em Geociencias. Gerencia de Sedimentologia e Estratigrafia], e-mails:,


    This study integrates palynofacies analyses and the sedimentological and stratigraphic model of the Oligo-Miocene/Miocene siliciclastic deposits from the stratigraphic interval of the shallow continental platform up to the slope/basin of the Oligo-Miocene/ Miocene of the Campos Basin proposed. The main objective of the palynofacies study was to characterize the particulate sedimentary organic matter to obtain information about the proximal-distal relationship and the sedimentary organic matter preservation and depositional environmental conditions. The 158 core samples collected in 29 wells of the 9 oil production fields (Albacora, Barracuda, Marlim Sul, Marlim, Voador, Marlim Leste, Moreia and Albacora Leste), were studied. This technique provides information about the proximal-distal relationship and the paleoenvironmental conditions of deposition and preservation of sedimentary organic matter, to facilitate the evaluation and comparisons between the associations of particulate organic components. Thus, the palynofacies technique can be used as another tool in the characterization of depositional systems, based on the spatial and temporal distribution of sedimentary intervals. In general the palynofacies assemblages showed the predominance of the Phytoclast Group (terrestrial derived organic matter) at various degradation stages due to the selective preservation process diagnosed in the studied samples. Some samples, revealed high dinocysts percentages indicative of transgressive depositional conditions. From the obtained data, it was possible to characterize the stratigraphic sequences according to the distribution of particulate organic content (e.g. influence of fluvio-deltaic systems, oxygen system, regressive-transgressive tendencies of each sequence). Additional analyses of Total Organic Carbon (% wt) showed the control of the particulate components from the Phytoclast Group on the TOC (% wt) content, suggesting that the relative sea-level variation curves

  10. Cronología y paleogeografía del Terciario de la Cuenca Intermontana de Iglesia septentrional, Andes de San Juan, Argentina Geochronology and paleogeographic of the Tertiary intermontaneous basin of northern Iglesia, Andes of San Juan, Argentina

    G.H. Ré


    Full Text Available El sector norte de la cuenca no-marina de Iglesia, una cuenca a cuestas (piggyback del sistema plegado y corrido de Precordillera y al este de la Cordillera de los Andes, está subdividida en cinco subcuencas por altos estructurales con tendencia de orientación norte. La combinación de datos estratigráficos, de sísmica de reflexión y de geología de superficie con datos de estratigrafía magnética y dataciones de circones por trazas de fisión de depósitos volcánicos intercalados, permitieron determinar edades, correlaciones, y evolución paleogeográfica entre las subcuencas. Dos unidades estratigráficas distintas llenan la cuenca. La Secuencia 1, ligeramente proximal y con fuerte influencia volcánica se acumuló aproximadamente a los 17 Ma, cuando la cuenca de Iglesia era estrecha y elongada, pero sin disrupciones internas. Las secuencias 2 hasta la 11 se acumularon entre los 9 y los 4 Ma en un depocentro que primero se extendió a través del tiempo en forma simultánea con la subdivisión en subcuencas estructurales, y luego se restringió a la subcuenca estructural occidental. Resulta claro que las secuencias 2 a 11 corresponden al Grupo Iglesia, mientras que la asignación estratigráfica de la Secuencia 1 es incierta.The northern Iglesia nonmarine basin, piggyback to the Precordillera thrust belt and east of the main Andean ranges, is subdivided into 5 sub-basins by north-trending structural highs. We combine stratigraphic data from seismic reflection and surface geology with magnetic polarity stratigraphy and fission-track zircon dates on intercalated volcanic deposits to determine ages, correlations and paleogeographic evolution among the sub-basins. Two distinct stratigraphic units fill the basin. Sequence 1, with strong and seemingly proximal volcanic influence accumulated approximately 17 Ma when the Iglesia basin was narrow and elongate, but not internally disrupted. Sequences 2 through 11 accumulated between 9 and 4 Ma in

  11. Early evolution of the southern margin of the Neuquén Basin, Argentina: Tectono-stratigraphic implications for rift evolution and exploration of hydrocarbon plays

    D'Elia, Leandro; Bilmes, Andrés; Franzese, Juan R.; Veiga, Gonzalo D.; Hernández, Mariano; Muravchik, Martín


    Long-lived rift basins are characterized by a complex structural and tectonic evolution. They present significant lateral and vertical stratigraphic variations that determine diverse basin-patterns at different timing, scale and location. These issues cause difficulties to establish facies models, correlations and stratal stacking patterns of the fault-related stratigraphy, specially when exploration of hydrocarbon plays proceeds on the subsurface of a basin. The present case study corresponds to the rift-successions of the Neuquén Basin. This basin formed in response to continental extension that took place at the western margin of Gondwana during the Late Triassic-Early Jurassic. A tectono-stratigraphic analysis of the initial successions of the southern part of the Neuquén Basin was carried out. Three syn-rift sequences were determined. These syn-rift sequences were located in different extensional depocentres during the rifting phases. The specific periods of rifting show distinctly different structural and stratigraphic styles: from non-volcanic to volcanic successions and/or from continental to marine sedimentation. The results were compared with surface and subsurface interpretations performed for other depocentres of the basin, devising an integrated rifting scheme for the whole basin. The more accepted tectono-stratigraphic scheme that assumes the deposits of the first marine transgression (Cuyo Cycle) as indicative of the onset of a post-rift phase is reconsidered. In the southern part of the basin, the marine deposits (lower Cuyo Cycle) were integrated into the syn-rift phase, implying the existence of different tectonic signatures for Cuyo Cycle along the basin. The rift climax becomes younger from north to south along the basin. The post-rift initiation followed the diachronic ending of the main syn-rift phase throughout the Neuquén Basin. Thus, initiation of the post-rift stage started in the north and proceeded towards the south, constituting a

  12. Evolution of the Neogene Andean foreland basins of the Southern Pampas and Northern Patagonia (34°-41°S), Argentina

    Folguera, Alicia; Zárate, Marcelo; Tedesco, Ana; Dávila, Federico; Ramos, Victor A.


    The Pampas plain (30°-41°S) has historically been considered as a sector that evolved independently from the adjacent Andean ranges. Nevertheless, the study of the Pampas showed that it is reasonable to expect an important influence from the Andes into the extraandean area. The Pampas plain can be divided into two sectors: the northern portion, adjacent to the Pampean Ranges, has been studied by Davila (2005, 2007, 2010). The southern sector (34°-41°S) is the objective of the present work. The study of this area allowed to characterize two separate foreland basins: the Southern Pampa basin and the Northern Patagonian basin. The infill is composed of Late Miocene and Pliocene units, interpreted as distal synorogenic sequences associated with the late Cenozoic Andean uplift at this latitudinal range. These foreland basins have been defined based on facies changes, distinct depositional styles, along with the analysis of sedimentary and isopach maps. The basins geometries are proposed following De Celles and Gilles (1996) taking into account the infill geometry, distribution and grain size. In both cases, these depocenters are located remarkably far away from the Andean tectonics loads. Therefore they cannot be explained with short-wave subsidence patterns. Elastic models explain the tectonic subsidence in the proximal depocenters but fail to replicate the complete distal basins. These characteristics show that dynamic subsidence is controlling the subsidence in the Southern Pampas and Northern Patagonian basins.

  13. Relation between the sedimentary organic record and the climatic oscilations in the Holocene attested by palynofacies and organic geochemical analyses from a pond of altitude in southern Brazil



    Full Text Available This paper presents the quantitative and qualitative results obtained from palynofacies and geochemistry analyses carried out on a core covering approximately 8000 years of sedimentation of a pond of altitude located at the mining district of Ametista do Sul, southernmost Brazil. The main objective of this paper is to consider the paleoclimatic and paleoenvironmental significance of these analyses. The hydrological isolation renders this pond climatically sensitive to variations in pluviometric regime and this enabled infer rainfall events during the early Holocene, which was responsible for the beginning of the processes of water accumulation in the gossan and the sedimentation of the pond. Changes in the pattern of moisture over the time become the drier environment, resulting in the intermittent pattern of water depth that currently exists at the site. The fluctuations in water depth are inferred from the frequency of Botryococcus and other algae, which tend to decrease progressively toward the top where the autochthonous elements are replaced by parautochthonous and allochthonous elements. Pseudoschizaea, in turn, appears to act as a biological marker of these transitional intervals. The present results are of great importance for understanding the extent of climate change and its environmental impacts at regional and global levels.

  14. Three-dimensional approach to understanding the relationship between the Plio–Quaternary stress field and tectonic inversion in the Triassic Cuyo Basin, Argentina

    L. Giambiagi


    Full Text Available The Cacheuta sub-basin of the Triassic Cuyo Basin is an example of rift basin inversion contemporaneous to the advance of the Andean thrust front, during the Plio–Quaternary. This basin is one of the most important sedimentary basins in a much larger Triassic NNW-trending depositional system along the southwestern margin of the Pangea supercontinent. The amount and structural style of inversion is provided in this paper by a three-dimensional approach to the relationship between inversion of rift-related structures and spatial variations in late Cenozoic stress fields. The Plio–Quaternary stress field exhibits important N–S variations in the foreland area of the southern Central Andes, between 33 and 34° S, with a southward gradual change from pure compression, with σ1 and σ2 being horizontal, to a strike-slip type stress field, with σ2 being vertical. We present a 3-D approach for studying the tectonic inversion of the sub-basin master fault associated with strike-slip–reverse to strike-slip faulting stress regimes. We suggest that the inversion of Triassic extensional structures, striking NNW to WNW, occurred during the Plio–Pleistocene in those areas with strike-slip–reverse to strike-slip faulting stress regime, while in the reverse faulting stress regime domain they remain fossilized. Our example demonstrates the impact of the stress regime on the reactivation pattern along the faults.

  15. The Chilean granite (austral mountains of Buenos Aires-Argentina): preludial testimony of the Rifting Jurassic-Cretaceous in the Colorado and Macachin Basins

    The tectonic significance of Los Chilenos (140 16 Ma), forming the crystalline basement of the Sierras Australes de Buenos Aires, is out lighted as a preludial testimony of Jurassic-Cretaceous rifting which controlled the sedimentation in neighbouring Colorado and Macachin basins. (author)

  16. The interaction of heavy metals and nutrients present in soil and native plants with arbuscular mycorrhizae on the riverside in the Matanza-Riachuelo River Basin (Argentina).

    Mendoza, Rodolfo E; García, Ileana V; de Cabo, Laura; Weigandt, Cristian F; Fabrizio de Iorio, Alicia


    This study assessed the contamination by heavy metals (Cr, Cu, Pb, Zn), and nutrients (N, P) in soils and native plants, and the effect of the concentration of those elements with the density of arbuscular-mycorrhizal (AM) spores in soil and colonization in roots from the riverside of the Matanza-Riachuelo River Basin (MRRB). The concentration of metals and nutrients in soils and plants (Eleocharis montana, Cyperus eragrostis, Hydrocotyle bonariensis) increased from the upper sites (8 km from headwaters) to the lower sites (6 km from the mouth of the Riachuelo River) of the basin. AM-colonization on the roots of H. bonariensis and spore density in soil decreased as the concentrations of metals in soil and plant tissues increased from the upper to lower sites of the basin within a consistent gradient of contamination associated with land use, soil disturbance, population, and chemicals discharged into the streams and rivers along the MRRB. The general trends for all metals in plant tissue were to have highest concentrations in roots, then in rhizomes and lowest in aerial biomass. The translocation (TF) and bioconcentration (BCF) factors decreased in plants which grow from the upper sites to the lower sites of the basin. The plants tolerated a wide range in type and quantity of contamination along the basin by concentrating more metals and nutrients in roots than in aboveground tissue. The AM spore density in soil and colonization in roots of H. bonariensis decreased with the increase of the degree of contamination (Dc) in soil. PMID:25461058

  17. Patagonia Argentina

    A.J. Acuña


    Full Text Available La zona central de la Patagonia, Argentina, se encuentra sometida a explotación petrolera y sus suelos se caracterizan por ser deficientes en nitrógeno. Esto causaría un efecto negativo en los procesos de atenuación natural que se desarrollan en los suelos contaminados con hidrocarburos. El objeto de este estudio fue determinar cual es el efecto de la deficiencia de nitrógeno sobre la biodegradación de los hidrocarburos en un suelo de la Patagonia, Argentina. Se trabajó con tres microcosmos a los que se les realizó tratamientos diferentes. En uno se monitoreo la atenuación natural del sistema, en otro la fertilización con nitrógeno (N, fósforo (P y potasio (K, y en el último la fertilización con P y K. Durante el seguimiento se determinaron mineralización y medición de hidrocarburos, y se realizaron recuentos bacterianos y determinación de nitrato, nitrito y amonio. Los resultados indican que es posible la biodegradación de hidrocarburos en el suelo deficiente de nitrógeno de la Patagonia estudiado en tiempos mas prolongados que en aquellos que se realiza una fertilización con nitrógeno. El nitrógeno necesario para el proceso sería obtenido por los microorganismos del suelo por fijación biológica.

  18. Unraveling multiple provenance areas using sandstone petrofacies and geochemistry: An example in the southern flank of the Golfo San Jorge Basin (Patagonia, Argentina)

    Limarino, Carlos Oscar; Giordano, Sergio Roberto


    The aim of this paper is to study the provenance of Late Cretaceous sandstones deposited along the south flank of the Golfo San Jorge Basin. For this purpose, detrital modes of three hundred thirty-seven sandstone samples collected in the Mina del Carmen, Bajo Barreal, and Cañadón Seco Formations were studied in ten oil fields. According to the modal composition of the sandstones, six petrofacies were defined allowing the identification of not only principal, but also secondary provenance areas. The QVM and VQM petrofacies are more than 20% metamorphic, sedimentary, and polycrystalline quartz clasts (Lm + Ls + Qpg > 20%), evidencing a secondary signal of basement supply masked by a predominant volcanic provenance. The petrofacies VP and VF are characterized by Lm + Ls + Qpg 20%.), which indicate a supply of sediment from volcanic terrains and scarce derivation of materials from basement rocks. Based on the plagioclase/k-feldspar ratio, the VF petrofacies is interpreted to be dominated by the supply of sand grains from the Andean volcanic-arc, while VP is supposed have originated through the erosion of intermediate volcanic rock outcroppings in the Macizo del Deseado. Finally, both the VQ and QV petrofacies show Lm + Ls + Qpg <20% and Pm + Om<20%, indicating a provenance of volcanic areas coupled with minor contributions from basement rocks. During the Late Cretaceous, the Golfo San Jorge Basin underwent a sag phase that was characterized by very scarce volcanism and tectonic activity. Although these conditions did not favor defined patterns in the vertical stacking of petrofacies, the sandstones exhibit remarkable changes in their regional distribution, which were determined by the paleogeography of the basin and differences in basement composition within the source areas. Finally, a paleogeographic model for sediment circulation in the basin is proposed. This model recognizes the main fluvial dispersal trends that flowed northwest to southeast and transported

  19. A modern analog of past climatic impacts on sedimentary processes and landscape evolution in an intermontane basin: The Del Medio fan, NW Argentina

    Savi, Sara; Schildgen, Taylor F.; Tofelde, Stefanie; Wittmann, Hella; Strecker, Manfred


    The combined effects of tectonic and climatic forcing govern the evolution of landscapes, setting the scale of topographic relief and the pace of landscape changes over time. Tectonic uplift or changes in precipitation regimes can fundamentally modify erosional processes and sediment flux from hillslopes, change river profiles, and ultimately impact depositional systems downstream. The complexity of the response, however, often means that we cannot predict a priori how a given landscape will react to future changes in climate, or how it responded in the past to multiple episodes of climate change. The Del Medio catchment is located in the southern part of the Humahuaca Basin, an intermontane valley within the Eastern Cordillera in transition to the Puna Plateau. This area coincides with a climatic and vegetation divide between a sub-humid environment downstream and the semi-arid upper Humahuaca Basin. An extensive fan sourced in the Del Medio catchment covers ca. 18.6 km2 of the basin outlet. The fan stratigraphy and surface morphology suggest that the fan dynamics are dominated by debris-flow processes. The surface comprises abandoned channels, levees and lobes, while exposed sections in channel cuts reveal unsorted, matrix-dominated deposits, with individual boulders reaching a diameter of 5 m. To investigate rates and timing of the Del Medio fan evolution, we analyzed cosmogenic 10Be concentrations on the surfaces of large boulders from the fan surface, river sands in active channels, a depth profile, and bedrock exposed atop the drainage basin margins. Our preliminary CRN results illustrate the rapid rate at which the active fan surface is subject to change, with each of the 11 analyzed boulder samples providing ages of river sands record very high denudation rates that range from several mm/yr to tens of mm/yr, despite bedrock denudation rates from the basin margins of only 0.04 mm/yr. These contrasting denudation rates likely result from frequent landsliding

  20. Interference between thick- and thin-skinned tectonics along mountain fronts. Example of the Andean foothill (Neuquén basin, Argentina)

    Nivière, B.; Messager, G.; Lacan, P.; Xavier, J.


    The Chihuido anticline (37°30'S-38°40'S and 69° W-70° W) in western Argentina underlines the eastern orogenic front of Andes. North-south-oriented, it is a crustal-scale anticline, 120 km long and 80 km wide. It culminates at 1500 m in elevation. It is limited to the west by the Agua Amarga syncline and by the deep-rooted Salado fault system late Cretaceous in age. The main river of the area, the Neuquén river, runs north-south behind the Chihuidos to the west in the Agua Amarga syncline. To the south, it bends to the east across the southern terminaison of the anticline. To the north, the northern end of the Chihuido had been cross cut by the Colorado river that currently flows 60 km farther to the north. Folding of terrace remnants of these rivers attests of a Pleistocene tectonic activity of the anticline. They appear clearly bended over a length of ca 30 km with an amplitude of 350 m at the apex. Behind the anticline above the Agua Amarga syncline, the rio Neuquén is depositing a strong thickness of alluvial deposits. Uplift of the anticline resulted in an increase of dip, to the west and to the east, of a decollement level made of the Huitrin evaporites Aptian in age. This tilt allowed decollement of pelicular shales and sandstones of the Rayoso formation and of the Cenamanian continental redbed clastics of the Neuquén group above it. This slide lead to the opening of valleys at the apex of the anticline, interprated as extrado tension gashes, and to the growth of superficial folds at the eastern toe of the Chihuido. These folds root in the Huitrin evaporites and achieve extension of the apex of the anticline. Farther to the west along the Salado fault system, vertical offset of Pleistocene alluvial fans with surface faulting attest of an on-going reactivation of the former mountain front. This reactivation is interprated as the consequence of the uplift of the Chihuido fold. The increase of dip of the decollement level beneath the former tectonic wedge

  1. Redescription of Parspina argentinensis (Szidat, 1954) (Digenea: Cryptogonimidae) from freshwater fishes (Pimelodidae) in the basins of the Paraná and La Plata Rivers, Argentina, with comments on P. bagre Pearse, 1920.

    Ostrowski de Núñez, Margarita C; Arredondo, Nathalia J; Doma, Irene L; Gil de Pertierra, Alicia A


    The type-specimens of Parspina argentinensis (Szidat, 1954) from Pimelodus maculatus Lacépède, and new material from Iheringichthys labrosus (Lütken), Parapimelodus valenciennis (Lütken), Pimelodella gracilis (Valenciennes), Pimelodus albicans (Valenciennes), P. argenteus Perugia and P. maculatus caught in the basins of the La Plata and Paraná Rivers, Argentina, were studied to elucidate its taxonomic status. The type-specimens of Parspina bagre Pearse, 1920 from Pimelodella metae Eigenmann in Lake Valencia, Venezuela, were also studied and new observations on its morphology recorded. The amendation of the generic diagnosis of Parspina Pearse, 1920 is proposed based on the study of both species, which revealed, among other features, the absence of a thin walled-membrane enclosing the male terminal genitalia. Parspina argentinensis is characterised by the following features: absence of a gonotyl; presence of a bipartite seminal vesicle, pars prostatica and ejaculatory duct; caeca of nearly equal length; uterus extending from the level of the ventral sucker to end of body; testes symmetrical to slightly oblique; ovary transversely elongate, compact and variable in shape; and the utilisation of a wide range of freshwater fishes as hosts. The tegumental surface of this species is covered with pectinate spines arranged quincuncially. Spines decrease in size and density from forebody to hindbody. There are two types of sensory papillae, ciliated and dome-shaped. Ciliated papillae are distributed on the surface of the oral region and on the dorsal and ventral surfaces of the body, whereas dome-shaped papillae are found on the surface of the ventral rim of the oral sucker associated with a ciliated papilla. Gland-duct openings are interspersed with the spines of the oral crown. In addition, the infection indices of P. argentinensis vary widely, not only among different hosts but also between the Paraná and La Plata River basins. Higher prevalences of P. argentinensis

  2. Bibliografía Argentina del género Prochilodus (Pisces: Curimatidae).

    López, Hugo Luis; Bonetto, Argentino A.; Gómez, Sergio Enrique; Protogino, Lucila Cristina


    This compilation groups the bibliographic references up to the year 1992 of the species of the genus Prochilodus present in Argentina. A list of the species of the genus inhabiting del Plata basin is presented.

  3. Sedimentology and palaeontology of the Upper Jurassic Puesto Almada Member (Cañadón Asfalto Formation, Fossati sub-basin), Patagonia Argentina: Palaeoenvironmental and climatic significance

    Cabaleri, Nora G.; Benavente, Cecilia A.; Monferran, Mateo D.; Narváez, Paula L.; Volkheimer, Wolfgang; Gallego, Oscar F.; Do Campo, Margarita D.


    Six facies associations are described for the Puesto Almada Member at the Cerro Bandera locality (Fossati sub-basin). They correspond to lacustrine, palustrine, and pedogenic deposits (limestones); and subordinated alluvial fan, fluvial, aeolian, and pyroclastic deposits. The lacustrine-palustrine depositional setting consisted of carbonate alkaline shallow lakes surrounded by flooded areas in a low-lying topography. The facies associations constitute four shallowing upward successions defined by local exposure surfaces: 1) a Lacustrine-Palustrine-pedogenic facies association with a 'conchostracan'-ostracod association; 2) a Palustrine facies association representing a wetland subenvironment, and yielding 'conchostracans', body remains of insects, fish scales, ichnofossils, and palynomorphs (cheirolepidiacean species and ferns growing around water bodies, and other gymnosperms in more elevated areas); 3) an Alluvial fan facies association indicating the source of sediment supply; and 4) a Lacustrine facies association representing a second wetland episode, and yielding 'conchostracans', insect ichnofossils, and a palynoflora mainly consisting of planktonic green algae associated with hygrophile elements. The invertebrate fossil assemblage found contains the first record of fossil insect bodies (Insecta-Hemiptera and Coleoptera) for the Cañadón Asfalto Formation. The succession reflects a mainly climatic control over sedimentation. The sedimentary features of the Puesto Almada Member are in accordance with an arid climatic scenario across the Upper Jurassic, and they reflect a strong seasonality with periods of higher humidity represented by wetlands and lacustrine sediments.

  4. El Paleozoico inferior de la sierra del Campo, provincia de Tucumán: Nuevos datos sobre la prolongación austral de la cuenca eopaleozoica del noroeste argentino The lower Paleozoic in the Sierra del Campo, province of Tucumán: New data on the southern extension of the Eopaleozoic basin in northwestern Argentina

    MG Mángano


    Full Text Available El estudio de afloramientos del Paleozoico inferior de la sierra del Campo, provincia de Tucumán, proporciona información sobre el borde sur de la cuenca eopaleozoica del noroeste argentino. El análisis de facies indica que estos depósitos registran sedimentación en un complejo de barras arenosas submareales en un ambiente marino dominado por mareas. Una comparación con otros afloramientos de la cuenca sugiere una correlación regional con el Grupo Mesón.Study of Lower Paleozoic outcrops from the Sierra del Campo, Tucumán province, provides information on the southern margin of the Early Paleozoic basin of northwest Argentina. Facies analysis indicates that these deposits record sedimentation in a subtidal sandbar complex of a tide-dominated shallow sea. Comparison with other outcrops in the basin suggests a regional correlation with the Mesón Group.

  5. Argentina Welcomes Chinese Enterprises


    @@ On July 13,China-Argentina Entrepreneur Luncheon Meeting was held in Beijing.Cristina Fernandez de Kirchner,President of Argentina,Hui Liangyu,Vice Prime Minister of China and Wan Jifei,President of CCPIT attended the meeting.

  6. Astronomy in Argentina

    Muriel, Hernán


    This article analyses the current state of Astronomy in Argentina and describes its origins. We briefly describe the institutions where astronomical research takes place, the observational facilities available, the training of staff and professionals, and the role of the institutions in scientific promotion. We also discuss the outreach of Astronomy towards the general public, as well as amateur activities. The article ends with an analysis of the future prospects of astronomy in Argentina.

  7. Astronomy in Argentina

    Muriel, Hernán


    This article analyses the current state of Astronomy in Argentina and describes its origins. We briefly describe the institutions where astronomical research takes place, the observational facilities available, the training of staff and professionals, and the role of the institutions in scientific promotion. We also discuss the outreach of Astronomy towards the general public, as well as amateur activities. The article ends with an analysis of the future prospects of astronomy in Argentina.

  8. Helosis (Balanophoraceae en Argentina Helosis (Balanophoraceae in Argentina

    José Luis Fontana


    Full Text Available Se cita por primera vez para Argentina Helosis cayennensis (Swartz Sprengel var. cayennensis en base a colecciones hechas por los autores en la Isla argentina de Apipé Grande, Ituzaingó, provincia de Corrientes. Se describe e ilustra la especie, el desarrollo de la planta y su estado de conservación. Esta cita de Helosis corresponde a un género nuevo para la flora argentina.Helosis cayennensis var. cayennensis is reported for the first time for Argentina. The species is described and ilustrated. Developement and ecology are also given. Helosis is also a new generic record for Argentina.

  9. Structure and distribution of Hydrachnidia (Parasitengona-Acari in the sub-basin of the Grande River (Superior Basin of Quinto River. San Luis-Argentina Estrutura e distribuição dos Hidracáridos (Parasitengona-Acari na Subcuenca do Rio Grande (Conta Superior do Rio Quinto. San Luis-Argentina

    Carlos Raul Quiroga


    Full Text Available AIM: The purpose of this work was to determine genera diversity, structural attributes and distribution of the Hydrachnidia assemblages and their possible influences with certain abiotic parameters along the sub-basin of the Grande River, a 6th order stream in the province of San Luis; METHODS: four sampling sites (C1, E1, E2 and E3 were established in two different hydrological periods: high waters (HW and low waters (LW. Twenty-four samples were obtained using Surber sampler, and the hydraulic, physical and chemical characterization of the sampling sites was carried out. Density (ind.m-2, genus richness, Shannon-Wiener diversity index and Kownacki's dominance index were calculated; RESULTS: sixteen Hydrachnidia genera were observed. No significant differences were found between the abiotic parameters of each site. A positive correlation of Sperchon, Torrentícola and Neoatractides was observed in relation to flow and current velocity whereas Hygrobates showed a negative correlation. No significant differences were observed in Hydrachnidia abundances among the sites in HW and LW and between the pairs of each site in HW and LW. The genera with the highest densities were Hygrobates, Limnesia and Atractides, of which the first two were widely distributed. The rest only appeared sporadically. According to Kownacki's index Hygrobates and Limnesia were "dominant", Atractides were "subdominant" and the rest were "non dominant"; CONCLUSIONS: The found genera were distanced systematically and philogenetically. However, the specimens belonging to these genera exhibited very similar morphological characteristics, which were adaptations to rheophilous habitats. The representativity of Hygrobates and Limnesia might be due to the great abundance of their hosts and preys in the sub-basin. The decrease in the densities and the changes in the Hydrachnidia composition in E3 (post-dam site might be explained by the biotic interactions previously mentioned

  10. Eustatic and climatic control on the Upper Muschelkalk Sea (late Anisian/Ladinian) in the Central European Basin

    Franz, M.; Kaiser, S. I.; Fischer, J.; Heunisch, C.; Kustatscher, E.; Luppold, F. W.; Berner, U.; Röhling, H.-G.


    The Upper Muschelkalk in the Central European Basin (CEB) is a key example of eustatic and climatic controls on inland seas. The late Anisian rapid transgression from Tethyan waters culminated in a large semi-enclosed inland sea stretching across the CEB. Subsequently, the slow but successive retreat in the early Ladinian resulted in a small remnant sea. The pronounced stratal pattern architectures are translated into a framework of 3rd- and 4th-order T-R sequences. The latest Illyrian 3rd-order maximum flooding surface corresponds to maximum abundances of carbonates and marine phytoplankton. An euryhaline marine ecology is indicated by prasinophycean algae dominating over acritarchs and δ18OP values of 18.9-22.4‰ VSMOW corresponding to Tethyan references. During the 3rd-order regressive phase successive freshening up to hyposaline conditions is indicated by up to 3‰ depleted δ18OP values, shifts to more radiogenic 87Sr/86Sr ratios and maximum abundances of terrestrial palynomorphs. Likewise, 4th-order T-R sequences are constrained by commutated stratal pattern architectures, palynofacies and geochemistry. The favourable correlation of middle Triassic 3rd-order sequences of Tethyan and peri-Tethyan basins demonstrate the principle control of circum-Tethyan eustatic cycles. 4th-order sequences are evident and, although not yet correlatable in detail, indicate 106-year scale eustatic cycles which may be attributed to glacioeustatic sea-level changes. The subordinated control of arid to semiarid low latitude and semihumid to humid temperate mid latitude climates affected the Upper Muschelkalk Sea in particular during 4th-order sea-level lowstands. Substantial fresh water input from Scandinavian sources caused temporal stratification leading to stagnant bottom waters and/or sediments as indicated by palynofacies and U/Th and Ni/Co redox indices. The herein reconstructed middle Triassic zonal climates are in agreement to previously published Late Triassic zonal

  11. A lab in Argentina


    Mauricio Erben, a researcher at the National University of La Plata and the National Scientific and Technical Research Council, talks to Nature Chemistry about his experience of research in Argentina, and how it is inherently linked to the country's political climate.

  12. Radiation vulcanization in Argentina

    The possibilities of using in Argentina the radiation process to vulcanize natural latex are analyzed. Experimental studies to define the irradiation conditions have been carried out and the preliminary elaboration of an irradiation device that includes the chemical reactor has been started. (author)

  13. Mathematics Education in Argentina

    Varsavsky, Cristina; Anaya, Marta


    This article gives an overview of the state of mathematics education in Argentina across all levels, in the regional and world contexts. Statistics are drawn from Mercosur and UNESCO data bases, World Education Indicators and various national time-series government reports. Mathematics results in national testing programmes, Programme for…

  14. Rickettsia parkeri in Argentina

    Nava, Santiago; Elshenawy, Yasmin; Eremeeva, Marina E.; Sumner, John W.; Mastropaolo, Mariano; Paddock, Christopher D.


    Clinical reports of an eschar-associated rickettsiosis in the Paraná River Delta of Argentina prompted an evaluation of Amblyomma triste ticks in this region. When evaluated by PCR, 17 (7.6%) of 223 questing adult A. triste ticks, collected from 2 sites in the lower Paraná River Delta, contained DNA of Rickettsia parkeri.

  15. Albert Einstein visits Argentina

    Gangui, A; Gangui, Alejandro; Ortiz, Eduardo L.


    This is a detailed, day by day, account of Albert Einstein's activities, both social and scientific, during his 30-day stay in Argentina in 1925, including his lectures on relativity at the various local universities and his visit to the National Academy of Sciences, as follows from his personal Diary of the trip to South-America and other contemporary documents.

  16. Estratigrafía de 'sin-rift' (Triásico Superior-Jurásico Inferior) de la Cuenca Neuquina en la sierra de Chacaico, Neuquén, Argentina Syn-rift stratigraphy (Upper Triassic-Lower Jurassic) of the Neuquén Basin at the Sierra de Chacaico, Neuquén, Argentina

    Juan R Franzese; Gonzalo D. Veiga; Martín Muravchik; María Daniela Ancheta; Leandro D’Elía


    La sierra de Chacaico (Neuquén, Argentina) constituye una de las localidades más importantes para el análisis de la estratigrafía y relaciones espaciales del relleno inicial de la Cuenca Neuquina. Por medio de estudios estructurales y sedimentológicos de campo ha sido posible distinguir la naturaleza volcano-sedimentaria de la secuencia de ‘sin-rift’ así como su evolución estratigráfica durante el período extensional Triásico Superior-Jurásico Inferior. La sucesión de ‘sin-rift’ puede subdivi...

  17. Helosis (Balanophoraceae) en Argentina Helosis (Balanophoraceae) in Argentina

    José Luis Fontana; Orlando Fabián Popoff


    Se cita por primera vez para Argentina Helosis cayennensis (Swartz) Sprengel var. cayennensis en base a colecciones hechas por los autores en la Isla argentina de Apipé Grande, Ituzaingó, provincia de Corrientes. Se describe e ilustra la especie, el desarrollo de la planta y su estado de conservación. Esta cita de Helosis corresponde a un género nuevo para la flora argentina.Helosis cayennensis var. cayennensis is reported for the first time for Argentina. The species is described and ilustra...

  18. Argentina set for privatization

    Buyers are lining up for Argentina's two big state-controlled petrochemical groups, Buenos Aires-based Petroquimica General Mosconi (PGM) and Petroquimica Bahia Blance (PBB). However, feedstock supply contracts with government-owned oil group Yacientos Petroliferos Fiscales (YPG) and gas group Gas del Estado hold the key to both sales. Shell Compania Argentina Petroleo SA (CAPSA), Perez Companc, and Global Petroleum have already bought PGM tender documentation. Shell says it will bid for PGM if the feedstock contract with YPF is acceptable. In addition to price and volume, Shell says the length is critical; it wants a 15-year deal, but would settle for 11. YPF initially sought a five-year contract. PGM, which produces 300,000 m.t./year of aromatics, plus oxo alcohols, methanol, and methyl tert-butyl ether, has sales of $150 million/year

  19. Fruit fly eradication: Argentina

    Fruit exports account for 9% of Argentina's total agricultural exports and generate annually close to $450 million. This could be increased but for fruit flies that cause damage equivalent to 15% to 20% of present production value of fruit and also deny export access to countries imposing quarantine barriers. The Department of Technical Co-operation is sponsoring a programme, with technical support from the Joint FAO/IAEA Division, to eradicate the Mediterranean fruit fly using the Sterile Insect Technique (SIT). (IAEA)

  20. The Huillin in Argentina

    Chehebar C.


    We recommend re-introduction of huillines in Lanin, Puelo and Los Alerces National Parks, through translocations of animals, so as to minimize the risks involved in the present dependence on Nahuel Huapi and Staten Island (as far as we know) for the conservation of the species in Argentina. Also, we recommend careful monitoring and protection of the Nahuel Huapi population and protection of the Staten Island ecosystems.

  1. Psychology In Argentina

    Modesto M. Alonso


    A summary on Psychology as science and profession in Argentina is presented. The report includes a historical review on places, criteria and results of psychologists'education, aspects of their professional practices; quantitative data on universities, graduates and students related to sociodemographic variables; characteristics of research activities, publications, legal frameworks and types of institutions where psychologists work. Some distinctive features of Argentine psychology are menti...

  2. Dollarization in Argentina

    Francois R. Velde; Marcelo Veracierto


    Argentina became highly "dollarized" during its hyperinflations of 1989 and early 1990. Although inflation has returned to very low rates, a high degree of dollarization has persisted during the early 1990s, counter to what the currency substitution hypothesis predicts. This paper provides new evidence that explains the continued dollarization of the Argentine economy. ; First, we develop a new measure of dollar currency circulating in foreign countries. This measure improves our ability to a...

  3. Argentina [Country report

    The airborne geophysical surveys developed in Argentina are described. They have got more than 500.000 km2 acquiring data for U, Th, K and total background activity. Other types of published data are also mentioned (satellite imagery, seismic hazard, climate, soil distributions, etc.). The availability of maps with the abundances of elements analyzed at the country and also at laboratories from Canada is described, as well as data of analysis of several elements at two study areas proposed at the outset of the project. The availability of process rate data and epidemiological data is also explained. Argentina intended fully to participate in the CRP at the outset of the project. Due, however, to external resource constraints imposed on the participating organization (Comision Nacional de Energia Atomica, CNEA), the level of participation had to be significantly reduced. Nonetheless, in the first period of the CRP, Argentina undertook to collate existing geological and geochemical information within the country, and began to define potential areas for site specific natural systems safety indicator studies. (author)

  4. Argentina's radioactive waste disposal policy

    The Argentina policy for radioactive waste disposal from nuclear facilities is presented. The radioactive wastes are treated and disposed in confinement systems which ensure the isolation of the radionucles for an appropriate period. The safety criteria adopted by Argentina Authorities in case of the release of radioactive materials under normal conditions and in case of accidents are analysed. (M.C.K.)

  5. International Uranium Resources Evaluation Project (IUREP) national favourability studies: Argentina

    Argentina is a predominantly lowland area of 2,789,240 square kilometers. The capital is Buenos Aires. The entire length of Argentina is bordered on the west by the Andes Mountains. Tile Northwest Andes-Piedmont region consists of deep valleys containing salt basins and volcanoes, and is an earthquake zone. Patagonia, in the south, is essentially an arid region of windy plateaus and valleys. The southern Andes are narrower and lower than the northern Andes and in the extreme south contain glaciers and ice fields. The east-central plain (Pampa) of Argentina has dry and humid sectors and contains most of the population. The largest rivers are chiefly in the northeast, many having only seasonal flow. There has been extensive surface and subsurface exploration for uranium in Argentina for over 20 years. Although most of the work has been performed by the CNEA, advisors from the U.S. and from the IAEA have also taken part. Private industry has been involved, but apparently only on a small scale. In the OECD report of 1970, it was stated that 400,000 square kilometers of Argentina appear very favorable for uranium while an additional 900,000 square kilometers offer fair possibilities. Uranium exploration to date suggests that sandstones of Permian and Cretaceous ages exposed in Western Argentina in the Cordillera are very promising for discovery of new deposits. Past CNEA estimates have indicated that there is considerable hope for new discoveries in those areas where reserves are now known. In addition to the known uraniferous provinces which are indeed favorable for further exploration, there are several other large areas that warrant attention. There are, for example, in the Santa Cruz area of about 15,500 square kilometers Cretaceous and Tertiary sediments with favorable facies for uranium deposition. In the Patagonia Cordillera, Jurassic, Cretaceous, and Tertiary sediments are of interest for prospecting, These rocks contain carbonaceous material and have been

  6. RERTR activities in Argentina

    The Atomic Energy Commission of Argentina has been an active participant of the RERTR program since 1978. An important milestone of the Argentinean RERTR program was the development and manufacturing at industrial scale of U3O8 dispersed fuel and its subsequent application to the conversion of the RA-3 reactor core to LEU fuel. More recently, our activities were focused on the development of U3Si2 fuel with a density of 4.8 gU/cm3 and the improvement of the manufacturing process of this type of fuel. The program to qualify CNEA as a supplier U3Si2 dispersed fuels is scheduled to finalize by mid 2003. To hasten this program the main research reactor of Argentina, the RA3, raised its power from 5 MW to 8 Mw in October this year. This is an intermediate step in the program to increase RA-3 power to 10 MW Currently, one of the main objectives is to develop and qualify the technology for the production of high-density LEU fuel elements using U-Mo alloy. An original way to produce U-Mo powder (the HMD process) was developed and its being upgraded to plant scale production. Another significant progress was the development of LEU targets for the production of 99Mo, in the form of miniplates prepared with dispersed LEU U-Alx. The shipment to USA of 207 MTR spent fuels containing US origin highly enriched uranium, successfully carried out in the end of 2000, is another remarkable achievement of the Argentinean RERTR program. This activity was carried out in the framework of the United States Foreign Research Reactor Spent Nuclear Fuel Acceptance Program. The fuels were fabricated in Argentina and used in the RA-3 reactor from 1968 to 1987. The inventory of the shipped HEU spent fuel consisted in 166 standard assemblies and 41 control assemblies. (author)

  7. Case study - Argentina

    Antecedents and experience of nuclear activities in Argentina; the Atomic Energy Commission (CNEA). First development and research activities. Research reactors and radioisotopes plants. Health physics and safety regulations. - Feasibility studies for the first nuclear power plant. Awarding the first plant CNA I (Atucha I). Relevant data related to the different project stages. Plant performance. - Feasibility study for the second nuclear power plant. Awarding the second plant CNE (Central Nuclear Embalse). Relevant data related to established targets. Differences compared with the first station targets. Local participation. Plant performance. (orig./GL)

  8. Desobediencia civil en Argentina

    Gustavo Fondevila


    Resumen: La crisis económica de Argentina en años recientes derivó en la pérdida de legitimidad de las instituciones políticas del país. La medida de suspensión de las libertades y garantías de derechos individuales provocó una desobediencia civil generalizada que llevó a miles de personas a manifestar pacíficamente su repudio al gobierno de Fernando de la Rúa. Este gesto ciudadano espontáneo, desorganizado y voluntario sirvió, entre otras cosas, para formar una autodeterminación primaria di...

  9. Salmonella enteritidis in Argentina.

    Caffer, M I; Eiguer, T


    A significant increase in the number of isolations of Salmonella enteritidis has been observed in Argentina since 1986. Outbreaks of foodborne diseases in humans were associated with the consumption of raw or undercooked hens' eggs. Between 1986 and the first 6 months of 1993 there were 150 outbreaks reported, affecting more than 6000 persons. A total of 71.3% of these outbreaks were confirmed by stool cultures, and 47.3% by bacteriological study of the food implicated in the outbreak. A permanent surveillance of salmonellosis is imperative, taking into account the persistence of Salmonella enteritidis isolations in sporadic cases and in new outbreaks. PMID:8155472

  10. Activities with Argentina

    In 1989, the US Department of Energy (DOE) responded to the need to redirect resources from weapons production to environmental restoration and waste management by establishing the Office of Environmental Management (EM) and delegated to this office the responsibility of cleaning up the US nuclear weapons complex. Now in its eight year, EM's mission has three central facets: (1) to assess, remediate, and monitor contaminated sites and facilities; (2) to store, treat, and dispose of waste from past and current operations; and (3) to develop and implement innovative technologies for environmental cleanup. To this end, EM has established domestic and international cooperative technology development programs, including one with the Republic of Argentina. Cooperating with Argentine scientific institutes and industries meets US cleanup objectives by: (1) identifying and accessing Argentine EM-related technologies, thereby leveraging investments and providing cost-savings; (2) improving access to technical information, scientific expertise, and technologies applicable to EM needs; and (3) fostering the development of innovative environmental technologies by increasing US private sector opportunities in Argentina in EM-related areas

  11. RERTR activities in Argentina

    The Atomic Energy Commission of Argentina has been involved in the Reduced Enrichment for Research and Test Reactors Program since 1978. The most relevant milestones of the program, regarding fuel R and D activities, were the development and manufacturing at industrial scale of U3O8 dispersed fuel assemblies and the conversion of the RA-3 reactor core to LEU fuel. More recently, the activities were focused in the development of high density U3Si2 fuel with a density of 4.8 gU/cm3 and the improvement of the manufacturing process of U3Si2 powder. Currently one of the main objectives is to develop and qualify the technology for the production of high-density LEU fuel elements using U-Mo alloy. Several alternative ways to obtain U-Mo powder are under development with the aim of evaluating plant scale production and costs. To boost this program the main research reactor of Argentina, the RA-3, will be upgraded to 10 MW early in 2001 and the hot cells at the Ezeiza Atomic Center are fully operational after important investments. Significant progresses were also carried out in the development of LEU targets for the production of Mo99. Experimental work has demonstrated the feasibility of the manufacturing and radiochemical processing of miniplate targets prepared with dispersed UAlx, maintaining the geometry and the alkaline processing of the HEU targets used so far. (author)

  12. Emergency action plan in the Comahue region, Argentina

    The first Emergency Action Plan (EAP) developed in Argentina for the major hydro basins in the country was described. The guidelines for the EAP came from the United States, but the criteria were adapted to the characteristics of the hydro projects and the rivers under study. The plan allowed, with an adequate degree of precision, the determination of the permissible levels that the rivers could reach, all along the region under study, in case an emergency was detected in one of the dams. It was possible to elaborate the flood maps at two different scales which, in turn, allowed visualization of the scope of each emergency. The plan was said to represent a major landmark in flood control in Argentina, and will serve as the basis of all future emergency planning. 11 ills

  13. Jurassic Paleoclimates in Argentina, a review

    Wolfgang Volkheimer


    Full Text Available New paleoclimatic evidence from palynologic and vertebrate proxies provides more detailed data on climatic change during the Jurassic in Argentina. Comparison with paleomagnetic data shows that the Neuquén basin shifted from the highest paleolatitudes (50ºS, by the end of the Triassic until the end of the Sinemurian. During the Pliensbachian-Toarcian it moved northward, reaching the lowermost paleolatitudes (25ºS, and subsequently (Middle to Late Jurassic the area moved again and attained eventually a position similar to its present-day position (30ºS. These movements are reflected in the Jurassic palynofloras. The high frequency of the pollen genus Classopollis (Cheirolepidiacean gymnosperms is of special paleoclimatic importance in the Argentinian Jurassic, as it is indicative of seasonal aridity or semiarid conditions during large intervals of this Period. During the shift of the South American continent to the northernmost position, the arrival of an important group of Araucariaceae, represented by Callialasporites spp., in the Toarcian could indicate an amelioration related to more humid conditions. Jurassic dinocyst assemblages studied in the Neuquén basin have proved to be useful paleoclimatic and paleobiogeographic proxies. Abundant remains of marine crocodiles in the Mid- and Late Jurassic of the Neuquén basin indicate warm water temperatures for this basin, probably in excess of 20° C. The occurrence of abundant turtles and other ectothermic vertebrates in the Middle Jurassic Cañadón Asfalto Formation of Chubut is in general accordance with the warm climate indicated for this unit by geologic evidence.

  14. Research reactors in Argentina

    Argentine Nuclear Development started in early fifties. In 1957, it was decided to built the first a research reactor. RA-1 reactor (120 kw, today licensed to work at 40 kW) started operation in January 1958. Originally RA-1 was an Argonaut (American design) reactor. In early sixties, the RA-1 core was changed. Fuel rods (20% enrichment) was introduced instead the old Argonaut core design. For that reason, a critical facility named RA-0 was built. After that, the RA-3 project started, to build a multipurpose 5 MW nuclear reactor MTR pool type, to produce radioisotopes and research. For that reason and to define the characteristics of the RA-3 core, another critical facility was built, RA-2. Initially RA-3 was a 90 % enriched fuel reactor, and started operation in 1967. When Atucha I NPP project started, a German design Power Reactor, a small homogeneous reactor was donated by the German Government to Argentina (1969). This was RA-4 reactor (20% enrichment, 1W). In 1982, RA-6 pool reactor achieved criticality. This is a 500 kW reactor with 90% enriched MTR fuel elements. In 1990, RA-3 started to operate fueled by 20% enriched fuel. In 1997, the RA-8 (multipurpose critical facility located at Pilcaniyeu) started to operate. RA-3 reactor is the most important CNEA reactor for Argentine Research Reactors development. It is the first in a succession of Argentine MTR reactors built by CNEA (and INVAP SE ) in Argentina and other countries: RA-6 (500 kW, Bariloche-Argentina), RP-10 (10MW, Peru), NUR (500 kW, Algeria), MPR (22 MW, Egypt). The experience of Argentinian industry permits to compete with foreign developed countries as supplier of research reactors. Today, CNEA has six research reactors whose activities have a range from education and promotion of nuclear activity, to radioisotope production. For more than forty years, Argentine Research Reactors are working. The experience of Argentine is important, and argentine firms are able to compete in the design and

  15. Operating practical experience at Argentina

    Operating experiences of Atucha-1 and Embalse Nuclear Power Plants were discussed in this work. The technical and economic aspects, such as reliability, availability, personnel training, operating costs, prices and market, which exercise influence upon Argentina nuclear energy policy, mainly on the power electric generation by nuclear power plants were considered. Finally the current status of the nucleoelectric sector in Argentina and forecasting were analysed

  16. Detrital and volcanic zircon U-Pb ages from southern Mendoza (Argentina): An insight on the source regions in the northern part of the Neuquén Basin

    Naipauer, Maximiliano; Tapia, Felipe; Mescua, José; Farías, Marcelo; Pimentel, Marcio M.; Ramos, Victor A.


    The infill of the Neuquén Basin recorded the Meso-Cenozoic geological and tectonic evolution of the southern Central Andes being an excellent site to investigate how the pattern of detrital zircon ages varies trough time. In this work we analyze the U-Pb (LA-MC-ICP-MS) zircon ages from sedimentary and volcanic rocks related to synrift and retroarc stages of the northern part of the Neuquén Basin. These data define the crystallization age of the synrift volcanism at 223 ± 2 Ma (Cerro Negro Andesite) and the maximum depositional age of the original synrift sediments at ca. 204 Ma (El Freno Formation). Two different pulses of rifting could be recognized according to the absolute ages, the oldest developed during the Norian and the younger during the Rhaetian-Sinemurian. The source regions of the El Freno Formation show that the Choiyoi magmatic province was the main source rock of sediment supply. An important amount of detrital zircons with Triassic ages was identified and interpreted as a source area related to the synrift magmatism. The maximum depositional age calculated for the Tordillo Formation in the Atuel-La Valenciana depocenter is at ca. 149 Ma; as well as in other places of the Neuquén Basin, the U-Pb ages calculated in the Late Jurassic Tordillo Formation do not agree with the absolute age of the Kimmeridgian-Tithonian boundary (ca. 152 Ma). The main source region of sediment in the Tordillo Formation was the Andean magmatic arc. Basement regions were also present with age peaks at the Carboniferous, Neoproterozoic, and Mesoproterozoic; these regions were probably located to the east in the San Rafael Block. The pattern of zircon ages summarized for the Late Jurassic Tordillo and Lagunillas formations were interpreted as a record of the magmatic activity during the Triassic and Jurassic in the southern Central Andes. A waning of the magmatism is inferred to have happened during the Triassic. The evident lack of ages observed around ca. 200 Ma suggests

  17. Soft rocks in Argentina

    Giambastiani; Mauricio


    Soft rocks are a still fairly unexplored chapter in rock mechanics. Within this category are the clastic sedimentary rocks and pyroclastic volcanic rocks, of low to moderate lithification (consolidation, cemen-tation, new formed minerals), chemical sedimentary rocks and metamorphic rocks formed by minerals with Mohs hardness less than 3.5, such as limestone, gypsum, halite, sylvite, between the first and phyllites, graphitic schist, chloritic shale, talc, etc., among the latter. They also include any type of rock that suffered alteration processes (hydrothermal or weathering). In Argentina the study of low-strength rocks has not received much attention despite having extensive outcrops in the Andes and great impact in the design criteria. Correlation between geomechanical properties (UCS, deformability) to physical index (porosity, density, etc.) has shown promising results to be better studied. There are many studies and engineering projects in Argentina in soft rock geological environments, some cited in the text (Chihuído dam, N. Kirchner dam, J. Cepernic Dam, etc.) and others such as International Tunnel in the Province of Mendoza (Corredor Bioceánico), which will require the valuable contribution from rock mechanics. The lack of consistency between some of the physical and mechanical parameters explored from studies in the country may be due to an insufficient amount of information and/or non-standardization of criteria for testing materials. It is understood that more and better academic and professional efforts in improv-ing techniques will result in benefits to the better understanding of the geomechanics of weak rocks.

  18. [Latin American malacology. Freshwater mollusks from Argentina].

    Rumi, Alejandra; Gregoric, Diego E Gutiérrez; Núñez, Verónica; Darrigran, Gustavo A


    A report and an updated list with comments on the species of freshwater molluscs of Argentina which covers an area of 2 777 815 km2 is presented. Distributions of Gastropoda and Bivalvia families, endemic, exotic, invasive as well as entities of sanitary importance are also studied and recommendations on their conservation are provided. Molluscs related to the Del Plata Basin have been thoroughly studied in comparison to others areas of the country. This fauna exhibits relatively the biggest specific richness and keeps its affinity with the fauna of other regions of the basin in areas of Paraguay and Brasil. The 4 500 records of molluscs considered in this paper arise from the study of the collections of Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Buenos Aires; Museo de La Plata, La Plata and Fundación "Miguel Lillo", Tucumán. These institutions keep very important collections of molluscs in southern South America. Field information has recently been obtained and localities cited by other authors are also included in the data base. Until today, 166 species have been described, 101 belonging to 10 families of Gastropoda and 65 to 7 of Bivalvia. Families with highest specific richness are Lithoglyphidae (22) and Sphaeriidae (25), respectively. The number of endemic species (those present only in Argentina) by family is: Gastropoda: Ampullariidae (1), Cochliopidae (10), Lithoglyphidae (11), Thiariidae (3), Chilinidae (11), Lymnaeidae (2) and Physidae (2?); Bivalvia: Hyriidae (1?); Etheriidae (1?) and Sphaeriidae (10). Families with a distribution that comprise almost the whole country are: the Sphaeriidae and the gastropods Cochliopidae, Chilinidae and Lymnaeidae. Families Erodonidae and Solecurtidae (Bivalvia) were registered in mixohaline environments from Buenos Aires province. Gastropod families Thiaridae and Glacidorbiidae show a very restricted distribution. The rest of the families are present mainly in the center and north of the country

  19. Abundancia y distribución de la fauna íctica en la cuenca del río Suquía (Córdoba, Argentina Abundance and distribution of fish fauna in Suquía river basin (Córdoba, Argentina

    Andrea Cecilia Hued

    Full Text Available En este trabajo se presenta la caracterización de los ensambles de peces de la cuenca del río Suquía. Los peces fueron recolectados, desde 1998 al 2002, en dieciséis sitios ubicados en los principales ríos dentro de la cuenca: arroyo San Francisco, río Cosquín, río Yuspe, río San Antonio y río Suquía. Se estimó la abundancia relativa de cada especie, riqueza, diversidad y dominancia en cada sitio estudiado. Se aplicó un Análisis Discriminante para determinar diferencias en la composición de las especies entre los ríos de la cuenca y antes y después de los principales centros urbanos. Veintiuna especies de peces fueron recolectadas en toda la cuenca, pertenecientes a doce familias y seis órdenes. Las especies mostraron diferentes patrones de variación. El Análisis Discriminante indicó marcadas diferencias de la ictiofauna entre los ríos. Si bien ellos compartieron un número elevado de especies, los patrones de abundancia de las mismas variaron entre sitios. Los resultados también demostraron el impacto negativo que ejerce la ciudad de Córdoba sobre los ensambles de peces. Este trabajo provee nuevos datos a cerca del estado de la ictiofauna del río Suquía y constituye un punto de partida que permitirá la aplicación de programas de monitoreo y evaluación con el fin de conocer la calidad de los recursos acuáticos.In this work a characterization of the Suquía river basin is presented. Fish were collected from sixteen selected sites from 1998 to 2002 in the main rivers of the basin: San Francisco brook, Cosquín river, Yuspe river, San Antonio river and Suquía river. Relative abundance, species richness, diversity and dominance were estimated. It was applied a Discriminant Analyses in order to determine differences in species composition among the studied rivers, and before and after the main urban settlement. Twenty one fish species were collected along the basin. They belong to twelve families and six orders. Fish

  20. Indicadores de contaminación biológica asociados a la erosión hídrica en una cuenca de Pampa Ondulada Argentina Indicators of biological contamination associated with water erosion in basin belonging the rolling pampa, Argentina

    Celio I. Chagas


    í a nivel de la cuenca bajo estudio.Agriculture activities use 70% of the world water resources, partly for animal production and particularly cattle feeding. There is an outstanding risk of biological contamination associated with this kind of production because animal feces and urine containing pathogens can be transported to surface waterways through runoff. The present investigation was carried out in the Tala basin belonging to the Rolling Pampa region in which intense runoff and erosion processes are widespread. In this basin there are extensive cattle feeding farms which are located close to the natural waterways, in bottomlands with hydrohalomorphic soils. There is also an increasing surface devoted to feedlots and intensive swine and poultry productions. The main use of the surface waters from the river and tributaries is direct cattle drinking. The aim of the present work was to analyze through biological indicators, the potential contamination of runoff water and sediments accumulated in lowlands devoted to cattle production and to determinate their human or animal origin. The waters showed concentration of biological indicators belonging to faecal streptococci and enterococci which can be related to animal but no to human contamination processes. A close relationship was observed between total coliforms and erosion borne sediment concentration in the studied area. Thus, the capacity of these sediments for carrying bacteria potentially harmful for animal health like Salmonella spp. was confirmed. The runoff, erosion and biological contamination processes proved to be related in the studied basin.

  1. Desobediencia civil en Argentina

    Gustavo Fondevila


    Full Text Available Resumen: La crisis económica de Argentina en años recientes derivó en la pérdida de legitimidad de las instituciones políticas del país. La medida de suspensión de las libertades y garantías de derechos individuales provocó una desobediencia civil generalizada que llevó a miles de personas a manifestar pacíficamente su repudio al gobierno de Fernando de la Rúa. Este gesto ciudadano espontáneo, desorganizado y voluntario sirvió, entre otras cosas, para formar una autodeterminación primaria directa de la voluntad popular y una autocomprensión del carácter democrático de la sociedad civil. La justificación de la desobediencia se basaba en una cuestión de derechos. Todos los manifestantes afirmaban que tenían derecho a desobedecer porque la desobediencia, en ciertas circunstancias, era un derecho humano. ¿Pero puede ser la desobediencia civil, en un Estado de derecho, un auténtico derecho? ¿En qué circunstancias, en el contexto legal y fuera de los derechos habituales de resistencia como huelga, manifestación, etcétera, se puede desobedecer una norma legal? Abstract: The recent economic crisis in Argentina led to the loss of identity of the country’s political institutions. The measure of the suspension of freedom and of the guarantee of individual rights provoked a generalized civil disobedience which led thousands of people to peacefully demonstrate their repudiation of Fernando de la Rúa’s government. This spontaneous, unorganized and voluntary action by the citizens served, among other things, to form a direct primary self-determination of the will of the people and a self-understanding of the democratic character of civil society. The justification of the disobedience was based on a question of rights. All the demonstrators asserted that they had the right to disobey because disobedience, in certain circumstances, was a human right. However, can civil disobedience, in a constitutional state, be an authentic right

  2. Estratigrafía del Grupo Neuquén, Cretácico Superior de la Cuenca Neuquina (Argentina: nueva propuesta de ordenamiento litoestratigráfico Stratigraphy of the Neuquén Group, Upper Cretaceous of the Neuquén Basin (Argentina: new proposal for lithostratigraphic ordaining

    Alberto C. Garrido


    éano Atlántico y el comienzo de la depositación del Grupo Malargüe.The Neuquén Group conform a succession of non-marine deposits of fluvial, aeolian and shallow lacustrine origin, developed in the Neuquén Basin between the Lower Cenomanian and the Middle Campanian (Upper Cretaceous. This succession reaches 1,200 m of maximum thick, being bounded at the base and the top by the Patagonidican and Huantraiquican unconformities respectively. In this paper two new formations are proposed (Los Bastos and Sierra Barrosa Formations, nom. nov., and the subgroups were reconfigurated. Consequently, the Neuquén Group is composed lithostratigraphically by three subgroups and nine formations. The Río Limay Subgroup comprehend the Candeleros and Huincul Formations, representing low sinuosity channel deposits developed under tectonic and climatic subordinated control. The Río Neuquén Subgroup comprehend to the Cerro Lisandro, Portezuelo, Los Bastos, Sierra Barrosa and Plottier Formations, conforming a psamitic and pelitic interstratified succession of fluvial origin, mainly developed under climatic control. Finally, the Río Colorado Subgroup integrated by the Bajo de la Carpa and Anacleto Formations, comprehend fluvial deposits developed under a new dominant tectonic control. At the start of the deposition of the Neuquén Group, the Dorsal de Huincul worked as a structural high, generating toward the south of the Neuquén Basin one a small endorreic depocentre corresponding to the Picún Leufú Sub-basin, scheme that would have been keep up to ends of the deposit of the Candeleros Formation. During the rest of the deposit of this sequence, the drainage would have been kept without major modifications towards the pacific slope across a central collector flowing in sense N-NW. Towards the end of the deposit of the Neuquén Group takes place the inversion of the regional slope of the basin, making possible the ingression of the Atlantic Ocean and the beginning of the deposition of

  3. Odonata from Iberá Wetlands (Corrientes, Argentina): preliminary inventory and biodiversity Odonata de los Esteros del Iberá (Corrientes, Argentina): inventario preliminar y biodiversidad

    Javier Muzón; Natalia Von Ellenrieder; Pablo Pessacq; Federico Lozano; Analía Garré; Juliana Lambruschini; Lía Ramos; María Soledad Weigel Muñoz


    A preliminary inventory of the Odonata from Iberá Wetlands and their area of influence (Corrientes, Argentina) is presented. Different kinds of environments were surveyed in seven localities. Seventy five species grouped in 33 genera and seven families were registered, from which three genera and 10 species are new records for the country. The localities belonging to the Iberá Wetland system show low endemicity and a high faunistic relationship with the Paraná basin.Se presenta un inventario ...

  4. Occupational health in Argentina.

    Werner, A F


    Argentina is within the denominated "new industrialised countries", with the characteristic of having high contrasts in the urban population, based on service and industry, and in the rural population, based on agriculture and cattle, still the main sources of wealth in the country. The process of globalisation and the need to compete hard in international markets have provoked high unemployment and the transfer of workers from a formal market to an informal one. Legislation on occupational health is old and it is in the process of being updated. The system of prevention, assistance and compensation for accidents at work and for occupational illnesses has changed from being optative for employers, to the compulsory hiring of private insurance companies. The Government keeps the role of supervisor of the system. There are enough professionals in occupational health, hygiene and safety but not occupational nurses. The teaching is given by many universities and professional associations, some of which have an active profile in the occupational health of the country. PMID:10963410

  5. Argentina and Brazil

    This paper reports that security is defined in different ways by many international actors. To some, security is tied to the definition of an external threat to borders, as in the case of the NATO countries. To other, security is related to development, as in the case of most Third World countries. but notwithstanding different definitions, all countries recognize that the essence of security is the survival of the nation-state itself. The nuclear programs of Argentina and Brazil are among the oldest, most sophisticated and advanced nuclear programs anywhere in the Third World. The programs have never been explained on the basis of threat perception, and in this regard perhaps they constitute the most atypical form of nuclear proliferation known to date. Not surprisingly, any attempt to explain the rationale for the Brazilian and Argentine nuclear programs based on common issues of threat =merely confuses the issue. Thus, nationalism, the search for national identity and pride, the need to express self-sufficiency and the desire to keep options open in an insecure and evolving world order must all be analyzed to comprehend the likelihood of future types of nuclear proliferation. Meanwhile, the study of the contemporary era of Argentine-Brazilian nuclear rapprochement may provide new insights into the complex reasoning behind the decision of countries to go nuclear

  6. LA RECURRENCIA DEL COIPO (MYOCASTOR COYPUS EN LOS REGISTROS ARQUEOFAUNÍSTICOS DE LA CUENCA INFERIOR DEL RÍO PARANÁ (ARGENTINA - The recurrence of the coypu (nutria (Myocastor coypus in the archaeofaunal record from the lower basin of the Paraná River (Argentina

    M.ª Belén Colasurdo


    Full Text Available En los registros arqueológicos de la cuenca inferior del río Paraná, hay un taxón que se encuentra siempre presente: el coipo (Myocastor coypus. Es por tal motivo que en este trabajo se realiza un análisis de la recurrencia de esta presa que se caracteriza por habitar en ambientes fluviales y que, dado su fácil captura y la posibilidad de aprovechar su piel, se estima que ha sido un recurso altamente explotado por los grupos cazadores-recolectores en el pasado. Para establecer el tipo de explotación de este recurso se llevó a cabo un análisis cuantitativo (NISP y NMI y cualitativo (modificaciones de las superficies óseas de los especímenes. Asimismo, con el objeto de evaluar la variabilidad de cada registro se realizó una comparación entre las propiedades que presentó cada conjunto para establecer las similitudes/diferencias entre los mismos. ENGLISH: In the archaeological record of the lower basin of the Paraná river, Myocastor coypus has been always present. For this reason in this paper we analyze the recurrence of this prey characterized as living in river ecosystems, and, because of its ease of hunting and the possibility of multiple uses of its fur, we estimate that this species was a resource highly exploited by hunter-gatherers in the past. Quantitative (NISP and MNI and qualitative (modification of the bone surface analyses of the recovered samples have been done in order to determine how M. coypus might have been exploited in the past. In order to evaluate the variability of the record, we compare samples from different sites in order to establish the similarities and/or differences among them.

  7. NREL technical assistance to Argentina

    Lilienthal, P. [National Renewable Energy Lab., Golden, CO (United States)


    This paper describes assistance to Argentina from the National Renewable Energy Laboratory which has touched on four programs: tariff analysis for rural concessions programs; wind/diesel hybrid retrofits in Patagonia; small hybrid systems designs for rural schools; an assessment of wind resources. The paper expands briefly on the first two points.

  8. Estratigrafía, facies y evolución depositacional de la Formación Sauce Grande (Carbonífero Superior: Cuenca Sauce Grande, Sierras Australes, Buenos Aires, Argentina Stratigraphy, facies and depositional evolution of the Sauce Grande Formation (Upper Carboniferous: Sauce Grande Basin, Sierras Australes, Buenos Aires, Argentina

    R. R. Andreis


    waques (Smw representan flujos de detritos finos y densos transicionales a flujos licuefactos. Las demás areniscas representan acción de oleaje o corrientes (Sr o por acreción frontal en barras transversales o dunas de arena por flujos traccionales (Sp. El comienzo de los procesos depositacionales de la Formación Sauce Grande fue caracterizado por una rápida transgresión en el Carbonífero tardío bajo condiciones de moderada subsidencia (procesos eustáticos. El megaciclo inferior se caracteriza por la sedimentación en un slope apron o debris apron localizado en las cercanías del talud continental, con fuerte agradación y rara progradación y depende del régimen termal de la base de los glaciares africanos de base fría, bajo condiciones de sistema de mar bajo. En el megaciclo medio significa una rápida fase de avance glaciar asociada a somerización isostática y el tope del apron habría sido retrabajado por olas y corrientes, creando una plataforma costa afuera casi emergente. En el megaciclo superior se produce un nuevo ascenso del mar (cortejo de mar alto, asociado al retroceso de los glaciares en el sector sudafricano y produce la transgresión tastubiana que se continúa en la Formación Piedra Azul. La disminucion del aporte se hace visible por la sistemática disminución en el espesor de las facies, una mayor frecuencia de facies Dmm1 y Smw y la interacción de depósitos pelíticos, que fueron depositados en plataformas de baja pendiente donde se han registrado avance y retroceso de los glaciares. Dos glaciohorizontes fueron identificados: el GH1 vinculado al megaciclo medio y el GH2 en el contacto entre las Formaciones Sauce Grande y Piedra Azul.The detailed analyses of the lithofacies (including their composition and the depositional processes related to the Sauce Grande Formation, represent the first siliciclastic sedimentation at the Sauce Grande Basin. Two profiles were studied: the North profile (with 826 m and the South profile (with 1095 m

  9. Assessing residual hydropower potential of the La Plata Basin accounting for future user demands

    Popescu, I.; L. Brandimarte; M. S. U. Perera; M. Peviani


    La Plata Basin is shared by five countries (Argentina, Bolivia, Brazil, Paraguay and Uruguay), which have fast growing economies in South America. These countries need energy for their sustainable development; hence, hydropower can play a very important role as a renewable clean source of energy. This paper presents an analysis of the current hydropower production and electricity demand in La Plata Basin (LPB), and it analyses the maximum and residual hydropower potential of the basin for a h...

  10. Maximum discharge and probable rainfall at Aiuruoca basin, Minas Gerais State

    Leandro Campos Pinto; Pedro Luiz Terra Lima; Zélio Resende de Souza


    Research on rainfall and annual daily maximum discharge rates is essential to support decisions during the design of hydraulic structures. This study tested the adequacy of probability functions to predict the probable rainfall and discharge rates of the Aiuruoca River Basin in Minas Gerais State in Brazil. This basin is very important as starting point of the Rio Grande Basin that eventually discharges into the Parana River in the southern region of Brazil at the border with Argentina. It wa...

  11. Radioactive waste management in Argentina

    An overview is provided on the major nuclear facilities operating in Argentina and data are given on radioactive wastes arising from these operations. The respective legal framework and the nuclear activities, including research and development, are outlined. The programme for the management of the different categories of radioactive wastes is described. Main milestones for establishing geological repositories for intermediate level and high level waste are highlighted. (author)

  12. Public information activities in Argentina

    This is a presentation involving a description of the main guidelines and conditions under which nuclear activities have been performed in Argentina, both concerning the autonomous development for the peaceful use of nuclear energy and with regard to the way in which the community was informed of the attained levels. The particulars of each approach are shown as to delineate historical evolution as a function of the various stages of technological development. (author)

  13. Home Financing Institutions in Argentina

    Marcela Cristini; Ramiro Moya


    (Available only in Spanish) This work analyses the case of the deepening of mortgage lending in Argentina in the 1990s and compares it with the failure of the 1980s. It shows that macroeconomic stability determines the development of the market and that a rapid takeoff can be achieved with the appropriate legal and market institutions (competition between banks and dollar contracts). The real price of property, and unemployment influence the performance of the market, which expands at the rat...

  14. Public University in Argentina: Subsidizing the Rich?

    Rozada, Martin Gonzalez; Menendez, Alicia


    Investigates educational equity and efficiency of higher education in Argentina. Concludes that despite the fact that public universities are tuition-free, only students from the richest families in Argentina are able to attend universities. Suggests improving higher education equality and efficiency by charging tuition fees and offering selective…

  15. Mida õpetab Argentina finantskriis? / Karsten Staehr

    Staehr, Karsten, 1962-


    Norra majandusanalüütik kirjeldab Argentina majanduspoliitikat, analüüsib tehtud vigu ning hoiatab avatud majandusega Eestit võimalike tulevaste välisshokkide eest. Diagramm: SKP kasv ja üleüldine riigieelarve tasakaal 1991-2001 Argentinas

  16. Biochronostratigraphy and paleoenvironment analysis of Neogene deposits from the Pelotas Basin (well 2-TG-96-RS), Southernmost Brazil.

    Silva, Wagner G; Zerfass, Geise S A; Souza, Paulo A; Helenes, Javier


    This paper presents the integration of micropaleontological (palynology and foraminifera) and isotopic (87Sr/86Sr) analysis of a selected interval from the well 2-TG-96-RS, drilled on the onshore portion of the Pelotas Basin, Rio Grande do Sul, Brazil. A total of eight samples of the section between 140.20 and 73.50 m in depth was selected for palynological analysis, revealing diversified and abundant palynomorph associations. Species of spores, pollen grains and dinoflagellate cysts are the most common palynomorphs found. Planktic and benthic calcareous foraminifera were recovered from the lowest two levels of the section (140.20 and 134.30 m). Based on the stratigraphic range of the species of dinoflagellate cysts and sporomorphs, a span age from Late Miocene to Early Pliocene is assigned. The relative age obtained from the 87Sr/86Sr ratio in shells of calcareous foraminifers indicates a Late Miocene (Messinian) correspondence, corroborating the biostratigraphic positioning performed with palynomorphs. Paleoenvironmental interpretations based on the quantitative distribution of organic components (palynomorphs, phytoclasts and amorphous organic matter) throughout the section and on foraminiferal associations indicate a shallow marine depositional environment for the section. Two palynologicals intervals were recognized based on palynofacies analysis, related to middle to outer shelf (140.20 to 128.90 m) and inner shelf (115.75 to 73.50 m) conditions. PMID:26312424

  17. Argentina en el siglo XX

    Franco Eugenio Nanni; Adriana Fátima Panico


    En un trabajo anterior (“Interpretando la crisis”), analizamos la crisis económico-financiera de 2008-2009 y sus similitudes con otras crisis ocurridas durante el siglo XX en Estados Unidos y el Reino Unido. En este trabajo nos proponemos analizar e interpretar la situación en Argentina, y otros países latinoamericanos. Para el análisis utilizamos las series del producto bruto, calculamos tasas de crecimiento e inflación y realizamos una breve comparación con otros países latinoamericanos. Ut...

  18. Argentina en el sistema internacional

    Tini, María Natalia


    El presente trabajo apunta a analizar cuál es el lugar "real" que ocupa la Argentina en el Sistema Internacional, en contraste, con el lugar "ideal" en que lo ha ido posicionando nuestra dirigencia en los últimos 10 años. Para ello, es esencial realizar un breve repaso de la política exterior llevada a cabo por las administraciones Menem y De La Rúa, como sustento empírico de dicho análisis. La hipótesis plantea que para proyectar una adecuada política exterior es necesario formular un ...

  19. Bioceres: AG Biotechnology from Argentina

    Roberto Feeney


    Full Text Available In this case we present a business decision-making situation in which the CEO of an Argentine Ag Biotech company, Bioceres, has to decide the best way to commercialize a new drought-tolerant transgenic technology. The company was founded by twenty three farmers, who shared a common dream that Argentina could become a benchmark in the development of Ag biotechnology. The case has strategic and financial implications, as well as decision-making situation involving a joint venture with an American biotechnology company. It also introduces to discussion the business models of Ag biotechnology companies in developing countries.

  20. Sistema de salud de Argentina The health system of Argentina

    Mariana Belló


    Full Text Available En este artículo se describe el sistema de salud de Argentina, que está compuesto por tres sectores: público, de seguridad social y privado. El sector público está integrado por los ministerios nacional y provincial, y la red de hospitales y centros de salud públicos que prestan atención gratuita a toda persona que lo demande, fundamentalmente a personas sin seguridad social y sin capacidad de pago. Se financia con recursos fiscales y recibe pagos ocasionales de parte del sistema de seguridad social cuando atiende a sus afiliados. El sector del seguro social obligatorio está organizado en torno a las Obras Sociales (OS, que aseguran y prestan servicios a los trabajadores y sus familias. La mayoría de las OS operan a través de contratos con prestadores privados y se financian con contribuciones de los trabajadores y patronales. El sector privado está conformado por profesionales de la salud y establecimientos que atienden a demandantes individuales, a los beneficiarios de las OS y de los seguros privados. Este sector también incluye entidades de seguro voluntario llamadas Empresas de Medicina Prepaga que se financian sobre todo con primas que pagan las familias y/o las empresas. En este trabajo también se describen las innovaciones recientes en el sistema de salud, incluyendo el Programa Remediar.This paper describes the health system of Argentina.This system has three sectors: public, social security and private.The public sector includes the national and provincial ministries as well as the network of public hospitals and primary health care units which provide care to the poor and uninsured population. This sector is financed with taxes and payments made by social security beneficiaries that use public health care facilities. The social security sector or Obras Sociales (OS covers all workers of the formal economy and their families. Most OS operate through contracts with private providers and are financed with payroll

  1. C and O isotopic composition of late cretaceous-paleocene carbonate sequences in Argentina and Chile

    In many basins where the Cretaceous-Tertiary (K-T) transition has been investigated, important environmental changes have been observed. Only in few places in South America this transition was recorded by carbonates to allow for a C, O isotope investigation, important sensors for climatic changes. Among these localities, it deserves mentioning the Pernambuco-Paraiba a coastal basin, NE Brazil, the Yacoraite and Neuquen basins, Argentina, and Navidad, Algarrobo and Magellan basins, Chile. Some C and O isotope data for K-T transition carbonates are available for the Pernambuco-Paraiba coastal basin. In this basin, Ferreira et al. (1996) observed an important incursion of δ13C from +2%oPDB to -5.5%oPDB at the K-T transition in limestones, as usually observed worldwide (e.g. Magaritz,1989) accompanied by an increase in δ18O (-6 to -3%oPDB) to 1%oPDB, suggesting an important cooling at the K-T transition. Ashrof and Stinnesbeck (1989) recognized a major climatic change in the K-T transition in north-eastern Brazil, a tropical to subtropical climate predominated during the Maastrichtian, whereas subtropical to temperate one prevailed during the Danian. Hsu and Wissert (1980) proposed, based on O isotopes, that during Late Maastrichtian, temperatures in South Atlantic ranged from 18 to 25oC, culminating with cooling immediately before the K-T transition. Huber et al. (1995) proposed a gradual cooling to values as low as 10oC, in the Late Maastrichtian, in the southern high latitudes. We examine here the behavior of C and O isotopes and chemistry (Si, Mg/Ca, Sr, Fe and Mn) in the Yacoraite Fm. (Maimara and Cabra Corral localities, NW Argentina) and in the Magellanes Province, southern Chile. One of the scopes of this study is to contrast the C and O isotope patterns from southern South America with those in NE Brazil (au)

  2. Argentina: entre o Mercosul e a Alca

    Raúl Bernal-Meza


    Full Text Available Este artigo procura mostrar que a Argentina não está numa encruzilhada na sua política externa, tendo que escolher entre Mercosul ou Alca. Ao contrário, a Argentina vê o Mercosul como um caminho que leva à Alca, afirmando uma posição que se tornou possível depois da confluência de outros fatores, como a posição brasileira frente a Alca e o modelo de integração regional proposta para o Mercosul.This article seeks to show that Argentina is not in crossroads in your foreign policy, having to choose between Mercosur and FTAA. In contrast, Argentina sees Mercosur as a way that leads to FTAA, affirming a position that become possible after a confluence of others factors, as the Brazilian position front Alca and the model of regional integration proposal for Mercosur.

  3. Argentina en el MERCOSUR (2007-2011)

    Gentile, María Elisa


    En este trabajo se analizan los principales aportes de Argentina en el MERCOSUR, bajo el primer gobierno de Cristina Fernández de Kirchner teniendo en cuenta que el gobierno de la Argentina hizo del bloque regional uno de los ejes principales de su política exterior. Como resultado, en los últimos años han aparecido indicadores de resurgimiento del MERCOSUR, a pesar de lo cual aún persisten algunos conflictos.

  4. Argentina: toward energy self-sufficiency

    Argentina has one operating nuclear power plant, the 367 MWe Atucha I supplied by Kraftwerk Union. The second plant, at Rio Tercero, is a standard 600 MWe CANDU, expected to be in service in 1981. Contractors are Atomic Energy of Canada Ltd. for the nuclear steam supply, and Italimpianti for the balance of the plant. Bids are being considered for a third plant, Atucha II. Argentina is moving gradually towards developing a nuclear industry based on its own uranium and manpower resources. (LL)

  5. An Energy Overview of Argentina

    The DOE Office of Fossil Energy is maintaining a web site that is meant to provide useful business- and energy-related information about countries and regions of the world for exporters, project developers, and researchers. The site consists of more than 130 country pages (organized into seven different world regions), with each country page having its own set of links to information sources about that country. There are also more than 30 Country Energy Overviews at the web site -- each of these is a comprehensive review of a specific country's entire energy situation, including sections on Energy Policy, Oil, Natural Gas, Coal, Hydroelectric/Renewables, Nuclear Power, Energy Transmission Infrastructure, Electricity, Electric Industry Overview, Environmental Activities, Privatization, Trade, and Economic Situation. The specific country highlighted in this Country Energy Overview is Argentina. The site is designed to be dynamic. Updates to the overviews will be made as need and resources permit

  6. Poverty and Health in Argentina

    Maria Alejandra Silva


    Full Text Available This article examines health conditions in the rural areas of Central Argentina, the country’s main region for soy-bean production and export. Health conditions are analyzed through the concepts of emerging and re-emerging diseases in a context of increasing poverty. Data on poverty and health was obtained from both primary sources (trade union, government officials, rural doctors and the South Watch/FA/FODEPAL/UNR working group and secondary sources (IPEC/INDEC, IDESA, Consultora Equis, the Argentine Ministry of Employment, ILO, the Ministry of Health, the Ministry of the Environment, toxicology centers and rural doctors. Analysis of rural health conditions gives cause for concern. There is evidence of deterioration in the social determinants of health such as an increase in rural and urban poverty associated with informal employment and child labor. At the same time lack of government epidemiological and toxicological data appears to hide or distort the reality of health conditions.

  7. Soybean biomass produced in Argentina

    Semino, Stella; Paul, Helena; Tomei, Julia;

    Soybean biomass for biodiesel, produced in Argentina amongst other places, is considered by some to reduce greenhouse gas emissions and mitigate climate change when compared with fossil fuel. To ensure that the production of biofuels is ‘sustainable', EU institutions and national governments are...... been demonstrated in several studies, but the atmospheric impact of soybean cultivation has not been tested in situ. Some of the models for climate impact (N2O emissions etc) are based on in vitro studies, while field data are scarce. The situation, which is outside the control of the EU, has not been...... environmental sustainability. This is exemplified by soy, whose cultivation undermines the climate benefit claimed for soy-based biodiesel. This paper concludes that to certify soy monocultures as sustainable would exacerbate existing climatic and environmental problems....

  8. Assessing residual hydropower potential of the La Plata Basin accounting for future user demands

    Popescu, I.; L. Brandimarte; M. S. U. Perera; M. Peviani


    La Plata Basin is shared by five countries (Argentina, Bolivia, Brazil, Paraguay and Uruguay), which have fast growing economies in South America. These countries need energy for their sustainable development; hence, hydropower can play a very important role as a renewable clean source of energy. This paper presents an analysis of the current hydropower production and electricity demand in La Plata Basin (LPB), and it analyses the maximum and residual hydropower potential of th...

  9. Assessing residual hydropower potential of the La Plata Basin accounting for future user demands

    Popescu, I.; L. Brandimarte; Perera, M. S. U.; M. Peviani


    La Plata Basin is shared by five countries (Argentina, Bolivia, Brazil, Paraguay and Uruguay), which are having fast growing economies in South America. These countries need energy for their sustainable development; hence hydropower can play a very important role as a renewable clean source of energy. This paper presents an analysis of the current hydropower production and electricity demand in La Plata Basin (LPB) and makes an analysis of the maximum and residual hydropower potential of t...

  10. Evidence for early Pliocene and late Miocene transgressions in southern Patagonia (Argentina): Sr-87/Sr-86 ages of the pectinid "Chlamys" actinodes (Sowerby)

    del Rio, C. J.; Griffin, M; McArthur, J. M.; Martinez, S.; Thirlwall, M. F


    Numerical ages based on 87Sr/86Sr dating of calcitic shells belonging to the pectinid “Chlamys” actinodes (Sowerby) document the only late Miocene (Tortonian) sea flooding event in the Austral Basin at Cabo Buentiempo (8.95 ± 0.82 Ma, 2 s.e.), and provide evidence of the first documented early Pliocene (Zanclean) transgression in Argentina recorded at Cañadón Darwin (5.15 ± 0.18 Ma, 2 s.e., Austral Basin) and at Terraces of Cerro Laciar (5.10 ± 0.21 Ma, 2 s.e.), southern San Jorge Basin). The...

  11. Argentina

    Guillermina Fernández Zambón


    Full Text Available La actividad industrial, de cualquier época, tiene una gran importancia para el hombre, pues al igual que el resto de los procesos económicos, es el reflejo del accionar cotidiano de la sociedad sobre el espacio. Considerando esto, el presente articulo tiene como objetivo presentar al patrimonio industrial como recurso para organizar rutas turísticas que permitan en algunos casos recuperar espacios industriales abandonados o usar establecimientos industriales en funcionamiento pero que pueden incorporarse a este tipo de desarrollo turístico. La creación de rutas turísticas puede permitir la reactivación de las economías locales, por constituirse en definitiva en una nueva actividad económica. Para lograr esto es necesario articular el sector público y el privado. De esta forma es posible, a través de la creación de rutas turísticas del patrimonio industrial, generar un desarrollo turístico local sustentable.

  12. Pisces, Gymnotiformes, Hypopomidae, Brachyhypopomus Mago-Leccia, 1994: First country record of three species of the genus, Argentina

    Almiron, A.; Casciotta, J.; Ciotek, L.; Giorgis, P.; Soneira, P.; F.R. DIAZ


    Brachyhypopomus bombilla, B. draco and B. gauderio are recorded for the first time in freshwaters of Argentina.These species were collected in the Río Paraná basin at the Iberá Wetlands and Pre-Delta National Park. Brachyhypopomusbombilla, B. draco and B. gauderio can be sympatric and syntopic in Pre-Delta National Park, whereas B. bombilla andB. gauderio occupy the same environments in the Iberá Wetlands. Some records of B. brevirostris for Argentina aremisidentifications of B. gauderio, whe...

  13. Control of nuclear materials and materials in Argentina

    A general view about the safeguards activities in Argentina is presented. The national system of accounting for and control of nuclear materials is described. The safeguards agreement signed by Argentina are presented. (E.G.)

  14. Isotopic study of the aquifer in the Tulum and Ullum-Zonda Valleys, San Juan, Argentina

    An isotopic and hydrochemical study on groundwater from Ullum-Zonda and Tulum Valleys, San Juan province, Argentina, has been performed. Recharge areas and the different water types feeding the basin groundwater were determined. Gross isotopic differences among the San Juan river, originated in the high Cordillera de los Andes (δ18O = -16 per mille), rainwater over the surrounding hills (δ18O = -7 per mille) and the more positive local precipitation favoured this characterization. Also 14C content of twelve groundwater samples are presented. The interpretation of these results is discussed. (author). 9 refs, 3 figs, 2 tabs

  15. Uranium favourability and exploration in Argentina

    Full text: This paper presents an overview of the past and ongoing uranium favourability and exploration activities in Argentina, where different metallogenetic models are analysed and the radiometric surveys have a prominent place as a prospecting technique. Uranium exploration activities in Argentina began in 1951-1952. The Huemul sandstone type uranium deposit was found in 1954, while exploring for red bed copper mineralisation. The Tonco district with the sandstone deposits Don Otto and Los Berthos was discovered by an airborne radiometric survey conducted in 1958. During the late 1950s and the early 1960s, airborne surveys also led to the discovery of the Los Adobes sandstone type uranium deposit in Patagonia. During the 1960s, the Schlagintweit stockwork deposit and La Estela vein deposit were found by ground exploration in the granitic basement of the Pampean Ranges. In 1968, an airborne survey led to discovery of the Dr. Baulies deposit, which occurs in volcanoclastic sediments, in the Sierra Pintada district in Mendoza Province. During the 1970s, another extensive airborne survey contributed to the discovery of Cerro Condor U deposit. Considering the geological and structural evidence, a drilling program was executed in the vicinity of the Los Adobes deposit, finding U mineralization at the Cerro Solo location. An airborne gamma ray spectrometry survey carried out in 1978, covering 100,000 square kilometres of the Patagonia Region, contributed to the discovery of the small Laguna Colorada deposit located in a volcanic environment. Furthermore, this airborne survey defined several clusters of uranium anomalies that were investigated in detail. During the 1980s, an airborne survey conducted over 40,000 square kilometres of the granitic terrain of the Pampean Ranges, identified a number of strong uranium anomalies that became exploration targets. In 1986, ground exploration identified the uranium vein type mineralization at Las Termas in the Fiambala Ranges

  16. Age of formation deposition Tunes, Sierra de la Ventana Foldbelt, Argentina

    The Sierra de la Ventana, located in east-central Argentina, is the most important recharge area within the South American Plate, an extensive Paleozoic basin, which evolved from a passive margin basin to basin - ante country. The basin developed on the southwestern edge of the supercontinent Gondwana, where magmatic activity occurred in large areal and temporal scale during the Paleozoic, particularly during the Permian . Tufáceos horizons that occur in the Sierra de la Ventana and the Cape Foldbelt Basins and San Rafael, Paraná, Sauce Grande and Karoo can be correlated with this period of intense magmatic activity . Five igneous zircons in an interleaved tufácea layer with sandstones and mudstones of the Tunas Formation, through the U / Pb method were dated using LA - MC - ICP - MS . Yielded an age of 274.3 ± 4.8 Concord Ma for tuffs of the Tunas Formation . Inherited zircons with ages between 623 and 374 Ma, indicate provenance of Patagonian region. Analysis of x -ray diffraction allowed the identification of quartz, plagioclase, smectite and illite mineral constituents of the tufts . The presence of abundant quartz and plagioclase suggests a dacitic volcanism nature to volcanism of southwestern Gondwanan margin and smectite is interpreted as a product of alteration of volcanic material deposited in an aqueous environment

  17. The nuclear research centre at Bariloche, Argentina

    The nuclear research centre at Bariloche (CAB) is one of the four centres under the Atomic Energy Commission of Argentina (CNEA). The research programme of CAB addresses various issues like nuclear reactor development, nuclear fuel and fuel cycle, applications of radioisotopes and radiation, and waste management. There is also a basic nuclear science component. The human resource development in the areas of physics and nuclear engineering is done in an associated Balseiro Institute which has undergraduate and graduate programmes as well as doctoral and postdoctoral research. The Centre interacts well with the society and provides services in the nuclear area. It has a close interaction with the nuclear sector of Argentina as also with many international organisations. Regulatory control over the Centre is carried out by the Nuclear Regulatory Authority of Argentina. (author)

  18. Environmental isotope tracking of hydrological processes in the Pampa Plain of Argentina

    In November 2004, the Isotope Hydrology Section of the IAEA in Vienna organized the first Research Coordination Meeting of the Coordinated Research Project on Isotopic Age and Composition of Streamflow as Indicators of Groundwater Sustainability, aiming at the use of isotopes for tracing the amount, pathways and age of the subsurface contribution of groundwater to rivers. Among the 16 research teams worldwide participating in this project from 2004 until 2010 is the Grupo de Hidrogeologia del Centro de Geologia de Costas y del Cuarternario de la Universidad Nacional de Mar del Plata, working together with the isotope laboratory of the Instituto Nacional de Geocronologia y Geologia Isotopica in Buenos Aires on the hydrology and hydrogeology of the Quequen Grande basin in the Pampa plain of Argentina. This article briefly describes our experience after two years and highlights the positive impact of the Agency's support on the water knowledge and management in the Quequen Grande basin

  19. Vinna Basin

    Honěk, J.; Franců, J.; Mikuláš, Radek; Pešek, J.; Sýkorová, Ivana; Tomanová-Petrová, P.

    Prague: Czech Geological Survey, 2014, s. 223-241 ISBN 978-80-7075-862-5 R&D Projects: GA ČR GA105/06/0653 Institutional support: RVO:67985891 ; RVO:67985831 Keywords : Tertiary basins * Czech Republic * Cenomanian and Tertiary lignite * geology * stratigraphy Subject RIV: DB - Geology ; Mineralogy

  20. Radioactive waste management strategy in Argentina

    In this paper, an outline is given concerning the treatment, conditioning, characterization, storage, transport and final disposal of radioactive wastes arising in the fuel cycle, radioisotopes production plant, research centers, etc. The overall strategy of the Argentina program is to plan, develop and implement the technology and provide the facilities for the permanent isolation of commercially generated wastes, with the aim that this waste not compromise the health and safety of the general public. To implement all these activities, CNEA has established in 1986 a Radioactive Waste Management Program. This long term project is aimed at meeting all the requirements for the radioactive waste management of Argentina

  1. El desarrollo nuclear de Argentina y Brasil

    Quintanar, Silvia; Romegialli, Mónica


    En el Cono Sur Latinoamericano, Brasil y Argentina han concluido en materia de energía atómica una serie de acuerdos bilaterales, con jerarquía de tratados vinculatorios, que aseguran el uso exclusivamente pacífico de la energía nuclear. En los años 90 se profundiza el fortalecimiento de la confianza mutua, los gobiernos de Carlos Menem, en Argentina, Collor de Melho, Itamar Franco y Fernando H. Cardoso, en Brasil, siguen los lineamientos de las grandes potencias y en particular de Estados Un...

  2. Migration trends in Argentina: immigration and exile

    Fernando Osvaldo ESTEBAN


    Full Text Available Through the development of a typology of migration flows, the paper reviews the most important trends in the history of Argentina: the massive European immigration, internal migrations, and immigration from neighbouring countries. The paper then discuss the current process of emigration from Argentina, and the return of old immigrants. The paper assess the economic factors involved through an analysis of unemployment, poverty and income distribution indicators in recent years. Finally, the paper examines the possibility of diminishing the recent emigration trend due to economic reasons.

  3. Palaeoenvironmental significance of organic facies variation across the Lower Toarcian in the northeastern sector of the Lusitanian Basin, Portugal

    Rodrigues, Bruno; Duarte, Luís V.; Graciano Mendonça Filho, João; Guilherme Santos, Luiz


    The Pliensbachain - Toarcian is particularly well represented in the Lusitanian Basin (central western Portugal), dominated by benthic and necktonic marl-limestone succession, well dated by ammonites. In this general context, and besides all aspects related to the Toarcian Oceanic Anoxic Event (T-OAE), the Polymorphum (=Tenuicostatum) - Levisoni (= Serpentinum) ammonite zone boundary marks one of the most sedimentological changes occurred in the whole basin (Duarte, 1997). Among all well known available sections for this interval (e.g. Peniche and Rabaçal), the Alcabideque section shows at the base of Levisoni Zone a singular record of brownish marls very poor in macrofauna (the "Chocolate Marls"), unit that is exclusive of northern part of the basin (see Pittet et al., 2014). With the aim to improve the understand about the sedimentary vertical changes occurred between the late Pliensbachian (Emaciatum Zone) and the base of Levisoni Zone, and to clarify the palaeoenvironment of such unit, we developed an organic facies analysis, including palynofacies and organic geochemistry [total organic carbon (TOC), sulfur and biomarkers]. Results confirm that sediments are particularly poor in organic matter, with the highest TOC value reaching 0.41 wt.% around the top of Polymorphum Zone. In the studied succession (around 20 m thick) the organic content is represented mainly by components from palynomorph (essentially sporomorphs) and phytoclast (both opaque and non-opaque) groups (>85%). A strong change occurs at the base of Chocolate Marls, through a clear increase of sporomorphs under the form of tetrads and agglomerates and the lowest occurrence (Chocolate Marls", clearly associated with a drop in the sea level. This evidence agrees with the general interpretation presented by previous works about the sedimentary evolution of the whole Lower Toarcian of the western Iberian margin. References Duarte, L. V. 1997. Facies analysis and sequential evolution of the Toarcian

  4. Facies and carbon/oxygen isotopes of the Calabozo Formation (Middle Jurassic), Arroyo La Vaina, Mendoza, Argentina

    Facial / microfacial studies and geochemical isotopic analyses on marine jurassic carbonates of the Calabozo Formation (Dessanti, 1973) were carried out to reconstruct the palaeoenvironment and postdepositional history of the unit. This study is part of a project which purpose is the sedimentological and geochemical characterization of the Jurassic carbonate sequences of Cuenca Neuquina, in the southwestern Mendoza, Argentina. A detailed description about this basin can be found in Legarreta and Uliana (1999) and Riccardi et al. (2000). During the Late Bathonian and Early Callovian, the basin showed a reduction of the sedimentation area and a marked marginal facies progradation. West of Malargue, in areas with low detritic contribution, limestones of the Calabozo Formation were deposited. At the end of the Early Callovian, the basin was isolated, prevailing hypersaline conditions which caused the accumulation of the evaporites of the Tabanos Formation (Stipanicic, 1966) (au)

  5. Argentina - Women Weaving Equitable Gender Relations

    Stubbs, Josefina


    In 2001, after a long period of recession, Argentina faced the greatest economic, political, and institutional crisis in its history. Unemployment reached levels nearing 18 percent and the poverty rate reached a peak of 58 percent in 2002, increasing twofold the number of people living the poverty line and impacting in a disproportionate manner the most vulnerable and poverty stricken fami...

  6. Microsporidian isolates from mosquitoes of Argentina

    Microsporidia are among the most common and widely distributed microbial pathogens associated with mosquitoes in nature. Since 1980 studies of microsporidia in mosquitoes of Argentina were conducted at the Laboratory of Insect Vectors of CEPAVE. Eleven morphologically unique species of microsporidia...

  7. Argentina and Brazil's Relations to the EU

    Christensen, Steen Fryba

    Analysen diskuterer Argentina og Brasiliens relationer til EU i nyere tid med udgangspunkt i forhandlingerne om en associeringsaftale mellem EU og Mercosur, der igangsattes efter underskrivelsen af en bi-regional rammeaftale i 1995. Fokus er i særlig grad på, hvordan disse relationer bedst forstå...

  8. Argentina : Gender Equity in the Private Sector

    World Bank


    First tested in Mexico in 2003, and most recently applied in 2009 in Argentina, the World Bank has developed a model to incorporate gender equity into private sector organizations while simultaneously enhancing their business. Under the model, participating organizations conduct a self-diagnosis to identify gender biases and gaps in the operations. This baseline is then used to create and ...

  9. Rocky Mountain spotted fever in Argentina

    Cases of epidemic typhus have been documented in Argentina since 1919; however, no confirmed reports of spotted fever rickettsiosis were described in this country until 1999. We describe the first molecular confirmation of Rickettsia rickettsii, the etiologic agent of Rocky Mountain spotted fever (R...

  10. 1974 amnesty for migrants in Argentina.

    Marmora L


    ILO pub. Working paper commenting on migration policy trends and 1974 legislation (Decree 087-74) comprising an amnesty for irregular migrants in Argentina - discusses migrant workers' legal status and impact on the labour market, and considers their geographic distribution, demographic aspects, nationality, illiteracy, labour force participation, occupational structure, etc. Bibliography and statistical tables.

  11. Pathogenic Hantaviruses, Northeastern Argentina and Eastern Paraguay

    Padula, Paula; Martinez, Valeria P.; Bellomo, Carla; Maidana, Silvina; San Juan, Jorge; Tagliaferri, Paulina; Bargardi, Severino; Vazquez, Cynthia; Colucci, Norma; Estévez, Julio; Almiron, María


    We describe the first, to our knowledge, cases of hantavirus pulmonary syndrome in northeastern Argentina and eastern Paraguay. Andes and Juquitiba (JUQ) viruses were characterized. JUQV was also confirmed in 5 Oligoryzomys nigripes reservoir species from Misiones. A novel Akodon-borne genetic hantavirus lineage was detected in 1 rodent from the Biologic Reserve of Limoy.

  12. China Looks to Argentina to Grow Food


    @@ It might sound perverse for a Chinese company to go halfway round the globe to grow soya and other crops on unproductive land in a dry corner of Argentina. Yet that is what Beidahuang Group, a state-owned farm company based in the north-eastern Chinese province of Heilongjiang, is doing in the Pa-tagonian province of Rio Negro.

  13. Hemagglutinating Encephalomyelitis Coronavirus Infection in Pigs, Argentina

    Quiroga, Maria A.; Cappuccio, Javier; Piñeyro, Pablo; Basso, Walter; Moré, Gastón; Kienast, Mariana; Schonfeld, Sergio; Cáncer, José L.; Arauz, Sandra; Pintos, María E.; Nanni, Mariana; Machuca, Mariana; Hirano, Norio; Perfumo, Carlos J.


    We describe an outbreak of vomiting, wasting, and encephalomyelitis syndrome in piglets in Argentina, caused by porcine hemagglutinating encephalomyelitis coronavirus (PHE-CoV) infection. Diagnosis was made by epidemiologic factors, pathologic features, immunohistochemistry, reverse transcription–PCR, and genomic sequencing. This study documents PHE-CoV infection in South America.

  14. The Politics of Human Rights in Argentina

    Brysk, Alison


    Revised edition of 1994 out-of-print Stanford University Press study of human rights protest, social change, and democratization in Argentina.  A symbolic politics analysis of the truth commission, trials, and policy reform in Latin America's most sweeping transition of the 1980's.

  15. Nuclear energy regulation in Argentina

    The Nuclear Regulatory Authority was established as an autonomous body reporting to the Presidency of Argentina by Act known as the Nuclear Activity National Act, and is empowered to regulate and control the nuclear activity with regard to radiation and nuclear safety, physical protection and nuclear non-proliferation issues. This report details functions and competence of the regulatory body in order to preserve its own independent criterion regarding every aspect of radiological and nuclear safety, and the global strategy of the regulatory system, which are concentrated in the following basics aspects: issue of the corresponding standards; execution of regulatory inspections and audits to verify the compliance with granted licenses and authorisations; independent execution of analyses and studies for the licensing process of nuclear installations; development of technical and scientific aspects associated to radiological and nuclear safety; training of personnel involved in radiological and nuclear safety, either belonging to the Regulatory Body or those working in installations, which perform practices under control. The regulatory control activities are carried out with independence of technical opinions and decisions; administrative autarchy; legal capacity to act in the field of public and private rights, and qualified personnel. The regulatory system complies with the concept of safety culture and its development, and the commitment to nuclear power plants' safety is made clear in design or operation concepts giving priority to safety over economic rentability of the installations. The compliance with Maintenance Programs, In-service Inspection Programs and good operation practices are also part of the commitment. This paper describes the organisational structure of the regulatory body, its human resources, personnel qualification and training, and the necessary financial resources. The regulatory body issues and establishes the standards, which regulate and

  16. Rapid hydrological response to central Andean Plateau uplift, NW-Argentina

    Rohrmann, Alexander; Sachse, Dirk; Strecker, Manfred R.; Mulch, Andreas; Pingel, Heiko; Alonso, Ricardo N.


    The response of the regional and global hydrological cycle, vegetation and erosion to tectonic surface uplift and topographic growth of the world's largest orogenic plateaus and their flanking ranges is subject to ongoing debate. During the last decade reconstructions of paleo-environmental conditions and the topographic evolution of mountain belts have increasingly relied on stable isotope proxies retaining the oxygen (δ18O) or hydrogen (δD) isotopic composition of ancient meteoric waters or carbon (δ13C) of vegetation. Intermontane basin sediments along the Puna of NW Argentina, the southern extension of the Altiplano-Puna Plateau and the world's second largest plateau, record the eastward-directed lateral growth of the central Andes and the spatiotemporal impact of tectonism on hydrologic, sedimentary, and ecological changes through time. Here we reconstructed paleo-hydrological changes during a phase of major Andean uplift and orographic barrier formation (10-2 Ma) along the eastern flank of the Puna Plateau from a sedimentary sequence within the intermontane Angastaco basin of NW Argentina (25°45 S, 66 W). We use a unique array of stable water-isotope proxies in leafwaxes, pedogenic carbonates and hydrated volcanic glass. In addition we use vegetation-cover proxies based on stable C isotopes obtained from leaf-waxes and pedogenic carbonates. Lipid biomarker leafwax δD values range between -95 and -160 ‰ (VSMOW), and δ13C values from -23 to -36 ‰ (PDB). Pedogenic carbonate δ18O values range from 18 to 31 ‰ (VSMOW) and δ13C values vary between -4 to -17 ‰ (PDB), whereas volcanic glass δD values range from -71 to -95 ‰ (VSMOW). In combination, these proxies provide a precipitation - evapotranspiration record, which reveals the onset of the South American Low Level-Jet in NW Argentina at ~ 9 Ma and the presence of seasonally humid foreland conditions until 7 Ma, followed by orographic barrier formation upwind of the basin and rapid creation of

  17. A large accumulation of avian eggs from the Late Cretaceous of Patagonia (Argentina) reveals a novel nesting strategy in Mesozoic birds

    Fernández, Mariela; Garcia, Rudolfo; Fiorelli, Lucas; Scolaro, Alejandra; Salvador, Rodrigo; Cotaro, Carlos; Kaiser, Gary; Dyke, Gareth


    We report the first evidence for a nesting colony of Mesozoic birds on Gondwana: a fossil accumulation in Late Cretaceous rocks mapped and collected from within the campus of the National University of Comahue, Neuquén City, Patagonia (Argentina). Here, Cretaceous ornithothoracine birds, almost certainly Enanthiornithes, nested in an arid, shallow basinal environment among sand dunes close to an ephemeral water-course. We mapped and collected 65 complete, near-complete, and broken eggs across...

  18. Odonata from Iberá Wetlands (Corrientes, Argentina: preliminary inventory and biodiversity Odonata de los Esteros del Iberá (Corrientes, Argentina: inventario preliminar y biodiversidad

    Javier Muzón


    Full Text Available A preliminary inventory of the Odonata from Iberá Wetlands and their area of influence (Corrientes, Argentina is presented. Different kinds of environments were surveyed in seven localities. Seventy five species grouped in 33 genera and seven families were registered, from which three genera and 10 species are new records for the country. The localities belonging to the Iberá Wetland system show low endemicity and a high faunistic relationship with the Paraná basin.Se presenta un inventario preliminar de los Odonata de los Esteros del Iberá, así como su área de influencia (Corrientes, Argentina. Distintos tipos de ambientes fueron muestreados en siete localidades. Se registraron setenta y cinco especies agrupadas en 33 géneros y siete familias, de las cuales tres géneros y 10 especies son nuevos registros para el país. Las localidades que pertenecen al sistema de Esteros del Iberá, muestran bajos niveles de endemismo y una similitud faunística elevada con la cuenca del Paraná.

  19. Argentina and Brazil: an evolving nuclear relationship

    Argentina and Brazil have Latin America's most advanced nuclear research and power programs. Both nations reject the Non-Proliferation Treaty (NPT), and have not formally embraced the Tlatelolco Treaty creating a regional nuclear-weapon-free zone. Disturbing ambiguities persist regarding certain indigenous nuclear facilities and growing nuclear submarine and missile capabilities. For these, and other reasons, the two nations are widely considered potential nuclear weapon states. However both nations have been active supporters of the International Atomic Energy Agency (IAEA) and have, in recent years, assumed a generally responsible position in regard to their own nuclear export activities (requiring IAEA safeguards). Most important, however, has been the advent of bilateral nuclear cooperation. This paper considers the evolving nuclear relationship in the context of recent and dramatic political change in Argentina and Brazil. It discusses current political and nuclear developments and the prospects for maintaining and expanding present bilateral cooperation into an effective non-proliferation arrangement. (author)

  20. Spent fuel management of NPPs in Argentina

    There are two Nuclear Power Plants in operation in Argentina: 'Atucha I' (unique PHWR design) in operation since 1974, and 'Embalse' (typical Candu reactor) which started operation in 1984. Both NPPs are operated by 'Nucleoelectrica Argentina S.A' which is responsible for the management and interim storage of spent fuel till the end of the operative life of the plants. A third NPP, 'Atucha II' is under construction, with a similar design of Atucha I. The legislative framework establishes that after final shutdown of a NPP the spent fuel will be transferred to the 'National Atomic Energy Commission', which is also responsible for the decommissioning of the Plants. In Atucha I, the spent fuel is stored underwater, until another option is implemented meanwhile in Embalse the spent fuel is stored during six years in pools and then it is moved to a dry storage. A decision about the fuel cycle back-end strategy will be taken before year 2030. (authors)

  1. Measurements of atmospheric fallout in Argentina

    With the purpose of studying the radioactive fallout present in Argentina from atmospheric nuclear explosions tests that have been conducted recently, an environmental monitoring program, outside the influence of nuclear facilities of Argentina, was undertaken during 1996 and 1997. The levels of Cs-137 and Sr-90 were analysed in samples of air, deposited material (rainwater), milk, an average meal of a standard man and food. During this period, a total of 630 radiochemical analysis were performed on 325 samples of the different matrices described. The concentration levels of the radionuclides analysed in the different environmental matrices are presented and are compared with the values obtained in the environmental monitoring program done during the period 1960-1981. (author)

  2. Presence of Pleurotus ostreatus in Patagonia, Argentina.

    Lechner, Bernardo Ernesto; Petersen, Ronald; Rajchenberg, Mario; Albertó, Edgardo


    Specimens belonging to the genus Pleurotus were collected growing on fallen trunks of Araucaria araucana, a native tree with a poorly known mycoflora, which grows in Patagonia, Argentina. Fruitbodies were produced in culture on sawdust from an isolated strain. Interspecific pairing tests performed between mating types of Pleurotus from Patagonia and tester strains of P. pulmonarius and P. ostreatus showed the Patagonia strain to be 100% compatible with P. ostreatus and incompatible with P. pulmonarius. Dikaryons obtained on sawdust were fertile, since they were able to produce fruitbodies and viable spores. This is the first documented record of P. ostreatus from Argentina and the first gilled fungus found growing on Araucaria araucana. PMID:12828514

  3. Memories of the armed struggle in Argentina

    Laura Margarita Pasquali


    This article presents and develops some of the edges on working of the guerrilla that emerge in the memories of the former militants of the armed organizations in Argentina. Beginig from this journey we will have access to the registration that one has presently on it, which will allows us to establish part of the subjective environment of the moment, the main characters consideration of the activism and their significance in the general context of the militancy.

  4. Radioactive waste packaging and transport in Argentina

    This article is aimed at summarising the activities related to the transport of radioactive materials carried out in Argentina and, especially, with regard to the transport of radioactive wastes. In particular, the legislation applicable within the national territory is described. Additionally, figures are provided on the features and amounts of transported radioactive materials, including radioactive wastes, concerning both the nuclear fuel cycle and activities related to their industrial and medical applications. (Author)

  5. Aedes aegypti resistance to temephos in Argentina

    Seccacini, Emilia; Lucía Mulas, Alejandro; Eduardo N Zerba; Licastro, Susana; Masuh, Hector M.


    Monitoring of resistance of Aedes aegypti to temephos was implemented in the provinces of Formosa and Misiones, Argentina, as a response to the need to improve the vigilance for the dengue vector in areas of high risk of dengue. Eggs collected in each locality were reared, and susceptibility to temephos was assayed using larval bioassays. A weak decrease in susceptibility of larvae to temephos was observed in Clorinda and Puerto Iguazú, indicating an incipient resistance with a resistance rat...

  6. Tierra del Fuego, Argentina, South America


    The Mitre Peninsula is the easternmost tip of Tierra del Fuego, Argentina, (54.5S, 65.5W). Early winter snow can be seen on this south tip of the Andes Mountains. These same mountains continue underwater to Antarctica. The Strait of Magellan, separating the South American mainland from Tierra del Fuego is off the scene to the north and west, but the Strait of LeMaire, separating Tierra del Fuego from the Isla de los Estados can be seen.

  7. Stronger Municipalities for Stronger Cities in Argentina

    Rémy Prud'homme; Hervé Huntzinger; Pierre Kopp


    In recent years a number of studies have been devoted to the twin issues of economic development and of decentralization in Argentina. Many papers have tried to understand the complex system of intergovernmental relations. Most of them, however, have focussed on the role of provinces, and neglected the problems raised by municipalities. This paper tries to bridge this gap, and to suggest that stronger municipalities could contribute to produce stronger cities that would in turn foster economi...

  8. Nuclear Power in Argentina and Brazil

    Clivia M. Sotornayor Torres; Wolfgang Rudig


    Clivia Sotomayor Torres and Wolfgang Rudig compare nuclear development in the two Latin American countries most likely to develop nuclear weapons: Argentina & Brazil. They pose three main questions.First, was nuclear energy necessary to meet energy needs? Here the answer is a clear no. Both countries have immense undeveloped hydropower resources and used inflated estimates offuture electricity demand in selecting the nuclear option.Second, does either country have the capability to develop nu...

  9. The "Private School Advantage" in Argentina

    Gustavo E. Fischman


    Local actors' perceptions of curricular and management changes in two private schools and one neighboring public secondary school in the city of Buenos Aires, Argentina, are analyzed. An exploration was conducted of how, within an ideologically and politically pro-reform context and a widespread acceptance of the "private school advantage," principals, teachers, and students in these schools evaluated the changes (or lack of them) in management, teaching, and curriculum orientations of the se...

  10. The "Private School Advantage" in Argentina

    Gustavo E. Fischman


    Full Text Available Local actors' perceptions of curricular and management changes in two private schools and one neighboring public secondary school in the city of Buenos Aires, Argentina, are analyzed. An exploration was conducted of how, within an ideologically and politically pro-reform context and a widespread acceptance of the "private school advantage," principals, teachers, and students in these schools evaluated the changes (or lack of them in management, teaching, and curriculum orientations of the secondary education sector.

  11. Informal Jobs and Trade Liberalisation in Argentina

    Montes-Rojas, G.; Acosta, P.


    Rapid trade liberalisation can exert profound effects on labour markets. Domestic firms, to sustain competitiveness for survival, could react through cutting labour benefits to achieve cost reductions. Alternatively, trade liberalisation may alter the industry composition of firms changing the aggregate formality rates. This paper studies the relationship between trade liberalisation and informality in Argentina. Using manufacturing industry-level data for 1992-2003, the results confirm the h...

  12. Argentina: Nuclear power development and Atucha 2

    In 2014, nuclear energy generated about 5,257 GWh of electricity or a total share of 4.05 % of the total electrical energy of about 129,747.63 GWh kWh produced in Argentina and there has been a trend for this production to increase. Argentina currently has a nuclear production capacity of 1,010 megawatts of electrical energy. However, when the Atucha 2 nuclear power plant is completed and starts commercial operation, it will add 745 megawatts to this electrical production capacity. There are two sites with nuclear power plants in Argentina: Atucha and Embalse. The Embalse nuclear power plant went into operation in 1984. At the Atucha site, the Atucha-1 nuclear power plant started operation in 1974. It was the first nuclear power plant in Latin America. Construction of Atucha-2 started in 1981 but advanced slowly due to funding and was suspended in 1994 when the plant was 81 % built. In 2003, new plans were approved to complete the Atucha 2. I summer 2014 the plant went critical for the first time. The construction was completed under a contract with AECL.

  13. Licensing new uranium production projects in Argentina

    Due to the decision to complete construction and begin operation of the Atucha II Plant, Argentina's nuclear reactor fuel requirements will increase in the mid-term from 120 tU/year to 220 tU/year. Current market conditions justify reactivation of indigenous production of uranium concentrates that could progressively replace imports. Consequently, CNEA presented to the Mendoza Province and national (Nuclear Regulatory Authority) licensing authorities a proposal for reactivation of the San Rafael Mining-Milling Complex. The main step in the licensing process is the Environmental Impact Assessment (EIA). This includes both assessment of the engineering for remediation of waste generated during previous production activities, and of environmental management of future production activities. The EIA was carried out by the National Technological University. The Cerro Solo Project, Chubut Province, which is currently at the pre-feasibility stage, is being considered for initiation of the feasibility study and development-production stage. Under present market conditions, the estimated project production cost has become competitive, and the resources of the project could be sufficient to supply the long-term needs of Argentina's nuclear power plants. Taking into account the increasing interest in environmental issues, and stricter environmental regulations, the main challenges to re-activation of uranium production in Argentina are: improvement of interaction with local communities; training of skilled personnel in waste management; and developing cost estimates and plans for mine-mill closure. (author)

  14. Argentina: Nuclear power development and Atucha 2

    Nogarin, Mauro


    In 2014, nuclear energy generated about 5,257 GWh of electricity or a total share of 4.05 % of the total electrical energy of about 129,747.63 GWh kWh produced in Argentina and there has been a trend for this production to increase. Argentina currently has a nuclear production capacity of 1,010 megawatts of electrical energy. However, when the Atucha 2 nuclear power plant is completed and starts commercial operation, it will add 745 megawatts to this electrical production capacity. There are two sites with nuclear power plants in Argentina: Atucha and Embalse. The Embalse nuclear power plant went into operation in 1984. At the Atucha site, the Atucha-1 nuclear power plant started operation in 1974. It was the first nuclear power plant in Latin America. Construction of Atucha-2 started in 1981 but advanced slowly due to funding and was suspended in 1994 when the plant was 81 % built. In 2003, new plans were approved to complete the Atucha 2. I summer 2014 the plant went critical for the first time. The construction was completed under a contract with AECL.

  15. Timing and rates of long-term landscape evolution in Southern Argentina

    Kollenz, Sebastian; Glasmacher, Ulrich A.; Rossello, Eduardo A.; Stoeckli, Danny F.


    The eastern Argentina South Atlantic passive continental margin is distinguished by a very flat topography. Out of the so called Pampean flat two mountain ranges are arising. These mountain ranges, the Sierras Australes and the Sierras Septentrionales, are located in the State of Buenos Aires south of the capital Buenos Aires. North of the Sierras Septentrionales the Salado basin is located. The Sierras Septentrionales and the Sierras Australes are also divided by a smaller intracratonic basin. Further in the South the Colorado basin is located. The Sierras Australes is a variscian fold belt originated by strong phases of metamorphosis, but till now it is unclear by how many tectonic phases the area was influenced (Tomezzoli & Vilas, 1999). It consists of Proterozoic to Paleozoic rocks. The Sierras Septentrionales consists mainly of Precambrian crystalline rocks. The Precambrian sequences are overlain by younger Sediments (Cingolani, 2010). The aim is to understand the long-term landscape evolution of the area by quantifiying erosion- and exhumation-rates and by dating ancient rock-uplift-events. Another goal is to find out how the opening of the south atlantic took effect on this region. To fulfill this goal, thermochronological techniques, such as fission-track dating and (U-Th-Sm)/He dating has been applied to samples from the region. Because there was no low- temperature thermochronology done in this area, both techniques were applied on apatites and zircons. Furthermore, numerical modeling of the cooling history has provided the data base for the quantification of the exhumation rates. The data-set show clusters of different ages which can be linked to tectonic activities during late Paleozoic times. Also the thermokinematic modeling is leading to new insights of the evolution of both mountain ranges and shows patterns of ongoing tectonic processes in this region. Calculated exhumation rates show also varying cooling histories and the influence of tectonics

  16. Exploration for uranium in Argentina: New policies of reactivation

    Full text: The policy established by the National Government of Argentina in August 2006 related to resuming the Nuclear activity in the country, lead the CNEA trough the Exploration of Raw Materials Manager (ERMM) to establish working strategies for the next 10 years. These strategies together with the assignment of an adequate budget will contribute to define new uranium resources, which together with the already known ones, will be used to supply the requirements of Nuclear Power and Research Plants in the future. Thus, the ERMM is applying a policy of human resources hiring new personnel in order to count with the minimum necessary workforce to reach these tasks. In Argentina known U resources are related to sedimentary, igneous and metamorphic environments. Considering the geology of the different regions, Argentina has been divided into 57 units in which the geological, geochemical, mineralogical and structural information is evaluated in order to estimate the uranium geological favorability of each unit. The final pursuit of this regional study is to circumscribe new areas with anomalous uranium contents in which prospection and exploration should be carried out. These studies together with prospection and exploration works are performed in the country by four exploration centers based in Salta (RN), Cordoba (R.Ce), Mendoza (R.Cu) and Trelew (RP). The works planned for each exploration center includes: Regional Noroeste, Mina Franca Deposit: peri-granitic vein- type mineralization: 25% of surface exploration has been performed. Mineralized areas: Istataco and San Buenaventura correspond to an igneous-metamorphic environment, Sierra de Vaqueria to a sedimentary one: Prospection stage. Regional Centro, Mineralized areas: El Gallo: drilling stage and Donato: prospection stage, correspond to an igneous-metamorphic environment with intra and peri-granitic anomalies. Noya: prospection stage, sedimentary environment. Regional Cuyo, Mineralized area: Western Sierra

  17. Intercultural Citizenship Education in an EFL Online Project in Argentina

    Porto, Melina


    In this article, I describe an online intercultural citizenship experience in an English as a Foreign Language (EFL) classroom in Argentina. An action research project on the Malvinas/Falklands war fought between Argentina and the UK in 1982 was carried out in 2012. Through a comparative methodology involving Argentine and English foreign language…

  18. Prospect for Development of Open Access in Argentina

    Miguel, Sandra; Bongiovani, Paola C.; Gomez, Nancy D.; Bueno-de-la-Fuente, Gema


    This perspective article presents an overview of the Open Access movement in Argentina, from a global and regional (Latin American) context. The article describes the evolution and current state of initiatives by examining two principal approaches to Open Access in Argentina: "golden" and "green roads". The article will then turn its attention to:…

  19. Overview of activities on CANDU fuel in Argentina

    This paper gives an outline of activities on CANDU fuel in Argentina. It discusses the nuclear activities and electricity production in Argentina, evolution of the activities in fuel engineering, fuel fabrication, fuel performance at Embalse nuclear power plant and spent fuel storage options.

  20. Laboratory Surveillance of Dengue in Argentina, 1995–2001

    Avilés, Gabriela; Paz, Maria Valeria; Rangeon, Griselda; Ranaivoarisoa, Marie Y.; Verzeri, Nora; Roginski, Sandra; Baroni, Pablo; Enria, Delia


    Local transmission of dengue fever virus in Argentina is increased by the presence of Aedes aegypti mosquitoes and dengue outbreaks in neighboring countries. From 1995 to 2001, a laboratory-based active surveillance program detected 922 dengue cases. Indigenous transmission involving dengue-1 and -2 serotypes was confirmed only in subtropical areas in northern Argentina.

  1. Argentina Imp Anti-dumping Duties on Tires from China


    On June 22, Argentina made the final anti-dumping adjudication once tires from China; on July 6, the Argentina authorities released the No. 221 resolution in 2011 issued by the Ministry of Industry: Impose 23% anti-dumping duties off estate car tires, 10% on the tires of machinery or vehicles used for agriculture and forestation,

  2. Cadenas productivas y disponibilidad de alimentos en Argentina Productive chains and food availability in Argentina

    Malena Giai


    Full Text Available En abril de 2009 se conformó en la Asociación Argentina de Dietistas y Nutricionistas Dietistas el Grupo de Estudio sobre Soberanía Alimentaria, constituido por un grupo de Licenciados en Nutrición con interés en el tema. Como primer objetivo, el Grupo se propuso estudiar tres temas: "el Derecho a la Alimentación", "la Producción y Disponibilidad de alimentos en Argentina" y "la Canasta Básica de Alimentos". En el presente artículo se expone un resumen de los avances en el segundo tema mencionado.In April 2009, was formed in the Argentina Association of Dieticians and Nutritionists Dietitians the Study Group on Food Sovereignty, established by a group of graduates in nutrition with interest in the subject. As a first objective, the Group was to examine three issues: "The Right to Food", "Production and Availability of food in Argentina" and "Basic Food Basket." This article is a summary of progress on the second topic mentioned.

  3. Tobacco industry targeting youth in Argentina

    Braun, S; Mejia, R; Ling, P M; Pérez-Stable, E J


    Background/aim Argentina has one of the highest cigarette smoking rates among both men and women in the Americas and no legislated restrictions on tobacco industry advertising. The tobacco industry has traditionally expanded markets by targeting adolescents and young adults. The objective of this study was to determine whether and how the tobacco industry promotes cigarettes to adolescents in Argentina. Methods We conducted a systematic search of tobacco industry documents available through the internet dated between 1995 and 2004 using standard search terms to identify marketing strategies in Argentina. A selected review of the four leading newspapers and nine magazines with reported high readership among adolescents was completed. The selected print media were searched for tobacco images and these were classified as advertisements if associated with a commercial product or as a story if not. Results The tobacco industry used market segmentation as a strategy to target Argentinean consumers. British American Tobacco (BAT) undertook a young adult psychographic study and classified them as “progressives”, “Jurassics” or “conservatives” and “crudos” or “spoiled brats”. BAT marketed Lucky Strike to the “progressives” using Hollywood movies as a vehicle. The tobacco industry also targeted their national brands to the conservatives and linked these brands with “nationalistic values” in advertising campaigns. Philip Morris promoted Marlboro by sponsoring activities directed at young people and they launched the 10 cigarettes packet as a starter vehicle. Conclusions The tobacco industry used psychographic segmentation of the population and developed advertising strategies focused on youth. Tobacco control researchers and advocates must be able to address these strategies in counter-marketing interventions. PMID:18299308

  4. A Water Resources Management Model to Evaluate Climate Change Impacts in North-Patagonia, Argentina

    Bucciarelli, L. F.; Losano, F. T.; Marizza, M.; Cello, P.; Forni, L.; Young, C. A.; Girardin, L. O.; Nadal, G.; Lallana, F.; Godoy, S.; Vallejos, R.


    Most recently developed climate scenarios indicate a potential future increase in water stress in the region of Comahue, located in the North-Patagonia, Argentina. This region covers about 140,000 km2 where the Limay River and the Neuquén River converge into the Negro River, constituting the largest integrated basins in Argentina providing various uses of water resources: a) hydropower generation, contributing 15% of the national electricity market; b) fruit-horticultural products for local markets and export; c) human and industrial water supply; d) mining and oil exploitation, including Vaca Muerta, second world largest reserves of shale gas and fourth world largest reserves of shale-oil. The span of multiple jurisdictions and the convergence of various uses of water resources are a challenge for integrated understanding of economically and politically driven resource use activities on the natural system. The impacts of climate change on the system could lead to water resource conflicts between the different political actors and stakeholders. This paper presents the results of a hydrological simulation of the Limay river and Neuquén river basins using WEAP (Water Evaluation and Planning) considering the operation of artificial reservoirs located downstream at a monthly time step. This study aims to support policy makers via integrated tools for water-energy planning under climate uncertainties, and to facilitate the formulation of water policy-related actions for future water stress adaptation. The value of the integrated resource use model is that it can support local policy makers understand the implications of resource use trade-offs under a changing climate: 1) water availability to meet future growing demand for irrigated areas; 2) water supply for hydropower production; 3) increasing demand of water for mining and extraction of unconventional oil; 4) potential resource use conflicts and impacts on vulnerable populations.

  5. Pennsylvanian and Cisuralian palynofloras from the Los Sauces area, La Rioja Province, Argentina: Chronological and paleoecological significance

    Pasquo, Mercedes di; Azcuy, Carlos L. [University/Organization, CONICET Institute CICyTTP, CICyTTP- CONICET Diamante - CP, Entre Rios (Argentina); Vergel, Maria del M. [INSUGEO-CONICET y Universidad Nacional de Tucuman, Facultad de Ciencias Naturales e Instituto Miguel Lillo, Miguel Lillo 205, San Miguel de Tucuman (Argentina)


    Three outcrops of the Libertad and Sauces Formations from the Los Sauces area La Rioja Province, western Argentina, yielded the nine palynoassemblages studied here. Two assemblage zones are defined on the basis of the stratigraphic distribution and ranges of seventy five species of palynomorphs (42 species of spores, 32 pollen taxa and one fungus). Only thirteen species are common to both assemblages and ten species are first records for the Paganzo Basin. Assemblage 1 from the Libertad Formation is dominated by trilete spores of Cristatisporites (lycophyte) and Punctatisporites (pteridophyte). Monosaccate pollen (Coniferales/Cordaitales) is frequently present. Pteridosperms, mostly represented by Cyclogranisporites, are especially abundant in one level together with scarce striate bisaccate pollen grains. Assemblage 2 of the Sauces Formation is dominated by trilete spores related to the Pteridophyta (e.g., Horriditriletes, Converrucosisporites, Granulatisporites) and Sphenophyta. Monosaccate (Cordaitales/Coniferales) and taeniate and non-taeniate bisaccate pollen grains (Pteridospermales/Coniferales), are equally subordinated. Monosulcate pollen (Cycadophyta) and fungi (Portalites gondwanensis) are rare. Assemblage 1 is mainly Moscovian; assemblage 2 Asselian-Sakmarian. This interpretation is based on correlation of assemblage 1 to the DMb (Mid Pennsylvanian) and assemblage 2 to the FS (Early Cisuralian) Biozones of the Paganzo Basin (Argentina). The taxonomic composition of the Ahrensisporites cristatus-Crucisaccites monoletus (Mid-Late Pennsylvanian) and the Protohaploxypinus goraiensis Subzone (Asselian-Sakmarian) of the Vittatina costabilis (Early Cisuralian) Biozones of the Parana Basin (Brazil) support this correlation. The continental freshwater depositional setting of this part of the Paganzo Basin is supported by the dominance of terrestrial palynomorphs and phytoclasts, the presence of coal and carbonaceous shales, and the occurrence of plant megafossils


    Adriana Amado


    Full Text Available This article summarizes the background of empirical journalism studies in Argentina.  In recent publications, researchers have consistently underscored the lack of data on the profession and the scarce development of theoretical frameworks related to journalism studies.  The local investigations have prioritized approaches and methods that do not give the whole picture of the population of journalists. Most of the research tends to equate media analysis and media messages with journalism study and keeps on failing to provide data that allows for learning about the working conditions and the professional profile of the Argentinean journalists.

  7. Las ciencias del mar en la Argentina

    Ogden, J.C.; Podestá, G.; Zingone, A.; Wiebe, W. J.; Myers, R.A.


    La situación de las ciencias del mar en la Argentina se puede caracterizar como una de ‘excelencia en aislamiento’. El tema dominante de las discusiones mantenidas por el comité que preparó este informe fue la virtual inexistencia de coordinación entre programas de investigación, equipo para realizar tareas de campo y personal científico y de apoyo en las instituciones. La coordinación que existe ocurre gracias a enormes esfuerzos individuales y a relaciones personales. Si bien en muchos luga...

  8. Una nueva saponina de Ilex argentina

    Schenkel, Eloir Paulo; Athayde, Margareth L.; Gustavo C. Giberti; Guillaume, Dominique


    Ilex argentina Lillo es una de las especies que ha sido mencionada como substituto de la yerba mate verdadera (Ilex yaraguariensis St. Hil.). La principal saponina de las hojas fue aislada y su estructura química elucidada a través de métodos espectroscópicos como el éster 28-β-D-glucopiranósido del ácido 3-O-α-L-arabinopiranosil-20(S)-19α, 24-dihidroxiursólico.

  9. Los vaivenes de la democracia Argentina

    Quiroga, Hugo


    Un conjunto de acontecimientos políticos, de signos adversos y propicios, recorrió el siglo XX en Argentina. Esa experiencia nos ha enseñado, con su historia repetida de fracasos (desobediencia de los militares al poder civil, proscripciones políticas, fraude electoral), que la legitimidad de la democracia requiere tanto de instituciones estables como de la conformidad de la sociedad con las reglas de la sucesión pacífica del poder, exigencias que otorgan validez al régimen ...

  10. Derechos humanos y sexualidad en la Argentina

    Mario Pecheny


    Full Text Available Este artículo presenta un panorama de la situación de los derechos que tienen que ver con la sexualidad, en la Argentina contemporánea. Basándose principalmente en la legislación positiva, se presenta en primer lugar una síntesis del sistema legal y político, resumiendo a continuación el proceso de inclusión de los derechos sexuales, sobre todo desde 1983, cuando se recuperó la democracia. Las temáticas abordadas son: igualdad civil y conyugalidad, orientación sexual e identidad de género, reproducción, aborto, violencia de género y violencia sexual, VIH/sida, y explotación y trabajo sexual. El artículo concluye con una reflexión sobre las principales deudas pendientes.This paper presents an overview of the situation concerning the rights related to sexuality in contemporary Argentina. Based specially on the positive legislation, it is primarily presented a synthesis of the legal and political system. Next, the paper summarizes the process of inclusion of the sexual rights, mainly since 1983, when democracy has been recovered. The following issues are addressed: civil equality and conjugality; sexual orientation and gender identity; reproduction; abortion; gender a sexual violence; HIV/Aids; and exploitation and sexual work. The paper ends with a consideration about the still remaining doubts.

  11. Central Argentina de Elementos Modulares (CAREM)

    CAREM (Central ARgentina de Elementos Modulares) is an Argentine project to develop, design and construct an innovative, simple and small nuclear power plant (NPP). This plant has an indirect cycle reactor with distinctive and characteristic features that greatly simplify the design and contribute to a high safety level. Some of the high-level design characteristics of the plant are: an integrated primary cooling system; self-pressurized primary system and safety systems relying on passive features. CAREM is a CNEA (Comision Nacional de Energia Atomica) project, which has been jointly developed with INVAP, an Argentine company. The CAREM concept was first presented in March 1984, in Lima, Peru, during the IAEA's conference on small and medium sized reactors. Chronologically CAREM was one of the first of the present new generation of reactor designs. The first step of this project is the construction of the prototype of about 27 MW(e) (CAREM-25). This project allows Argentina to sustain activities in nuclear power plant design, assuring the availability of updated technology in the mid-term. The design basis is supported by the cumulative experience acquired in research reactor design, construction and operation and pressurized heavy water reactor (PHWR) operation, as well as development of advanced design solutions. The Generation IV International Forum (GIF) recognized CAREM as an international near term deployment (INTD) reactor

  12. Validation of the PASAT in Argentina.

    Vanotti, Sandra; Eizaguirre, Maria Barbara; Cores, Evangelina Valeria; Yastremis, Cecilia; Garcea, Orlando; Salgado, Pablo; Cáceres, Fernando


    The Paced Auditory Serial Addition Test (PASAT) is one of the most used neuropsychological tests to assess information processing speed and working memory in brain injured patients. This study was carried out with the purpose of obtaining normative data for the PASAT-3″ in a healthy Argentinean population, which would result in a reference control population. The PASAT-3″ was administered in a sample of 296 healthy voluntary subjects, born and living in Argentina. The age range went from 20 to 70 years-old. The level of education was 0 to 13 or more years of schooling. The sample obtained a mean of 44.60 (SD = 10.72) in the PASAT-3″. It was found that the score obtained in the PASAT-3″ was related to the age and the level of instruction of the participants. Their performance diminished as age increased and, conversely, it increased as the level of instruction was higher. Normative data was obtained for a Latin American population from Argentina. Percentile distributions obtained by decades of age and different levels of education should be considered as useful reference values for clinicians and investigators when applying the PASAT-3″ to assess cognitive function in different pathologies. PMID:26980661

  13. The industrial nuclear fuel cycle in Argentina

    The nuclear power program of Argentina for the period 1976-85 is described, as a basis to indicate fuel requirements and the consequent implementation of a national fuel cycle industry. Fuel cycle activities in Argentina were initiated as soon as 1951-2 in the prospection and mining activities through the country. Following this step, yellow-cake production was initiated in plants of limited capacity. National production of uranium concentrate has met requirements up to the present time, and will continue to do so until the Sierra Pintada Industrial Complex starts operation in 1979. Presently, there is a gap in local production of uranium dioxide and fuel elements for the Atucha power station, which are produced abroad using Argentine uranium concentrate. With its background, the argentine program for the installation of nuclear fuel cycle industries is described, and the techno-economical implications considered. Individual projects are reviewed, as well as the present and planned infrastructure needed to support the industrial effort

  14. Yugoslav teachers in Argentina 1939-1944

    Stefanović-Banović Milesa


    Full Text Available In this paper we present reports of Yugoslav teachers who held classes to immigrants in Argentina 1939-1944, organized by the government of Kingdom of Yugoslavia. Teachers’ reports to Yugoslav Embassy in Buenos Aires testify of Kingdom of Yugoslavia efforts to oppose assimilation and promote and strengthen “Yugoslav national unity”. The reports also describe general social circumstances of Yugoslav immigrants, show various details from their everyday life and contain valuable data on numerous political, economic, social and cultural problems of this diaspora in Argentina and their relationship with motherland. We believe that archive materials presented in this paper opens numerous questions which could be topics of separate researches. Some of them could be the following: To which extent the teachers’ reports represented the actual situation and to which they were shaped to match policy and expectations of Kingdom of Yugoslavia? What was the actual influence of teachers to spreading the “national unity” among immigrants? Have their work left trace in Yugoslav diaspora and in which way? Beside all of the open issues, it is certain that teachers’ reports contain valuable data on immigrants’ everyday life, curriculum, schooling conditions, relationship with motherland, etc. [Projekat Ministarstva nauke Republike Srbije, br. 47016: Interdisciplinarno istraživanje kulturnog i jezičkog nasleđa Srbije. Izrada multimedijalnog internet portala "Pojmovnik srpske kulture"

  15. Spent Fuel Management of NPPs in Argentina

    There are two Nuclear Power Plants in operation in Argentina: “Atucha I” (unique PHWR design) in operation since 1974, and “Embalse” (typical CANDU reactor) which started operation in 1984. Both NPPs are operated by “Nucleoeléctrica Argentina S.A” which is responsible for the management and interim storage of spent fuel till the end of the operative life of the plants. A third NPP, “Atucha II” is under construction, with a similar design of Atucha I. The legislative framework establishes that after final shutdown of a NPP the spent fuel will be transferred to the “National Atomic Energy Commission”, which is also responsible for the decommissioning of the Plants. In Atucha I, the spent fuel is stored underwater, until another option is implemented meanwhile in Embalse the spent fuel is stored during six years in pools and then it is moved to a dry storage. A decision about the fuel cycle back-end strategy will be taken before year 2030. (author)

  16. [Dengue vaccines. A reality for Argentina?].

    Orellano, Pablo W; Salomón, Oscar D


    Dengue outbreaks have occurred yearly in Argentina since 1998. A number of candidate vaccines have been tested in endemic countries. The most advanced one was licensed in three countries of Latin America for children over 9 years of age. In the present article the benefits and drawbacks of these vaccines as well as the challenges for the implementation of a vaccination strategy in Argentina are discussed. Furthermore, a risk stratification strategy with new criteria and a multidisciplinary vision is suggested as a possible path for the assessment of the pertinence of a vaccination program in areas showing the highest risk of dengue transmission and/or for people at the greatest risk of developing severe dengue. It is also suggested that the definition regarding the status of endemicity should take into account the local realities. Finally, this paper proposes a broad discussion on the evidences, the expected impact and instrumental aspects that would be involved in the incorporation of a dengue vaccine, marketed or in development, into the national immunization program, and especially which subpopulation should be targeted for the immunization strategy to be cost-effective. PMID:27028058

  17. Brucellosis in buffalos from Corrientes northeast (Argentina

    G. Crudeli


    Full Text Available Buffalo’s production represents an important option as input source in livestock systems located in areas with little profitability by cattle. In mostly farms, cattle and buffalos are breeding together, due that in Argentina, to carry out buffalo’s production is in an extensive way, with the aim to produce meat – mostly- milk – for this production nutritional supplements are used- and leathers. Brucellosis is zoonic illnesses from bacteria belong to Brucella which caused human human health problems by contaminated food ingestion or to those who are in touch with cattle. In Argentina, exist the National Control an Elimination Program for cattle Brucellosis, which include buffalos also, there is inclosed female vaccination and serologic segregation of positive reactants. Diagnosis techniques ruled for cattle brucellosis are BPA (Buffered Plate Agglutination, Tube seroaglutination and 2MercaptoEthanol. International reference test is Complement Fixation. By means of this present work, we pretend to evaluate the serologic diagnosis utility, ruled to the buffalos and compare obtained results by BPA, SAT and 2ME with Complement Fixation Test. In the present communication are presented results from the use of diagnosis techniques recommended by SENASA (National Service of Sanity and Quality Agro-Food to buffalo’s serums which belong to nine farms from NE Corrientes State. Obtained results show that association o BPA as Screening Test and SAT and 2ME as Confirmated Test has a valid correlation for the detection of positive animals with the reference technique Complement Fixation.

  18. Horizontalidad, autogestión y protagonismo en Argentina

    Marina Sitrin


    Full Text Available Este artículo trata los movimientos sociales autónomos que surgieron después de la crisis económica y la posterior rebelión popular en Argentina en diciembre de 2001. Los movimientos autónomos en la Argentina, como tantos movimientos en el mundo de hoy, son movimientos basados en la creación de nuevas relaciones sociales y comunidades ahora, al mismo tiempo que proyectan nuevas sociedades y las relaciones en y para el futuro. Son movimientos con una concepción diferente del tiempo y el espacio. Son movimientos que entienden lo individual y lo colectivo como vinculados entre sí.Hay mucho en común entre la experiencia en la Argentina y las prácticas e ideas anarquistas. Eso no significa que los que están creando nuevas relaciones y comunidades en la Argentina sean anarquistas. Lo que este artículo intenta hacer es basarse en las experiencias de los movimientos sociales argentinos para iniciar una reflexión sobre las prácticas e ideas que los anarquistas pueden prestar a los distintos movimientos y comunidades autónomas; y, a su vez, sobre lo que los movimientos autónomos en la Argentina puede dar a las ideas y prácticas anarquistas.Palabras Clave: movimientos sociales, rebelión popular, Argentina, Anarquismo, movimientos autónomos_____________________ABSTRACT:This article discusses the autonomous social movements that arose after the economic crisis and subsequent popular rebellion in Argentina in December of 2001. The autonomous movements in Argentina, as so many movements around the world today, are movements based on creating new social relationships and communities now, while simultaneously creating new societies and relationships in and for the future. They are movements with a different conception of time and place. They are movements that see the individual and the collective as linked to one another.There is a great deal in common with the experience in Argentina and anarchist practices and ideas. That does not make

  19. Overview and perspectives for Open Access development in Argentina

    Sandra Miguel


    Full Text Available This paper provides an overview and perspectives for development of the Open Access movement in Argentina, within the global and regional (Latin American context. It outlines the evolution and current state of initiatives around the two main approaches to Open Access, the golden and green roads. The main Open Access policies and support of OA movement by governments in Latin American region, and particularly in Argentina, are highlighted, while recent studies on publishing practices and authors’ positions regarding Open Access are presented. The paper concludes that the prospects for development of OA in Argentina, both through golden and green roads are favorable, with their strengths and shortcomings

  20. Crustal Structure of the PARANÁ Basin from Ambient Noise Tomography

    Collaço, B.; Assumpcao, M.; Rosa, M. L.; Sanchez, G.


    Previous surface-wave tomography in South America (SA) (e.g., Feng et al., 2004; 2007) mapped the main large-scale features of the continent, such as the high lithospheric velocities in cratonic areas and low velocities in the Patagonian province. However, more detailed features such as the Paraná Basin, have not been mapped with good resolution because of poor path coverage, i.e. classic surface- wave tomography has low resolution in low-seismicity areas, like Brazil and the Eastern Argentina. Crustal structure in Southern Brazil is poorly known. Most paths used by Feng et al. (2007) in this region are roughly parallel, which prevents good spatial resolution in tomographic inversions. This work is part of a major project that will increase knowledge of crustal structure in Southern Brazil and Eastern Argentina and is being carried out by IAG-USP (Brazil) in collaboration with UNLP and INPRES (Argentina). To improve resolution for the Paraná Basin we used inter-station dispersion curves derived from correlation of ambient noise for new stations deployed with the implementation of the Brazilian Seismic Network (Pirchiner et al. 2011). This technique, known as ambient noise tomography (ANT), was first applied by Shapiro et al. (2005) and is now expanding rapidly, especially in areas with high density of seismic stations (e.g. Bensen et al. 2007, Lin et al. 2008, Moschetti et al. 2010). ANT is a well-established method to estimate short period (Petrobras with additional support from CNPq and FAPESP.

  1. Tabaquismo durante el embarazo en Argentina y Uruguay Smoking during pregnancy in Argentina and Uruguay

    Fernando Althabe


    Full Text Available Argentina y Uruguay están entre los países con mayor proporción de mujeres jóvenes fumadoras. Se desconoce cuál es la proporción exacta de ellas que fuman durante el embarazo así como las características de las que dejan de fumar y las que continúan fumando durante el embarazo. Realizamos una encuesta administrada por un/a entrevistador/a a 1512 mujeres embarazadas de 18 años o mayores (796 en Argentina; 716 en Uruguay, que concurrían a control prenatal en hospitales públicos de grandes conglomerados urbanos. 44% de las mujeres en Argentina y 53% en Uruguay habían sido o eran fumadoras. Durante el embarazo, 11% de las mujeres en Argentina y 18% en Uruguay continuaron fumando. En ambos países, la proporción de mujeres que vive con fumadores, permite fumar en el hogar y regularmente o siempre se encuentra en lugares cerrados con personas que estén fumando fue 49%, 46% y 20% entre las mujeres que nunca fumaron, 67%, 60% y 32% entre las que dejaron, y 78%, 75% y 52% entre las que continuaron fumando respectivamente. El estudio confirma un importante problema de salud pública y documenta que la exposición ambiental persiste en subgrupos de mujeres, aun en aquéllas que dejaron de fumar. Es importante que el sector de salud pública provea acceso a programas efectivos para dejar de fumar durante el embarazo. Cualquier nueva intervención a desarrollar que intente tener un éxito al menos moderado y sostenible, debiera incluir componentes que actúen sobre el entorno fumador de la mujer embarazada que fuma.Argentina and Uruguay are among the countries in which a large proportion of young women smoke. The rate of smokers during pregnancy in both countries is not well known, and data on the characteristics of women who quit smoking during pregnancy compared to those who continue smoking are not available. We conducted a survey including 1512 pregnant women >18 years old (796 in Argentina; 716 in Uruguay, during antenatal visits in


    Ralf Hesse


    Full Text Available The SRTM data set is the highest resolution DEM with global or continental coverage. It is therefore theDEM of choice for continental-scale geomorphological mapping and quantitative analysis. In this study,SRTM data are used for the identification and characterisation of endorheic basins in southern SouthAmerica (south of 19°S. The results show the feasibility of continental-scale quantitative geomorphologybased on SRTM data and provide insights into the distribution of closed basins. The largest endorheicbasin is located in the Puna region and consists of several interconnected sub-basins. This basin accountsfor 38.6 % (7877 km3 of the total volume of the endorheic basins identified in this study. Analyses of thegeographic distribution show a narrow longitudinal distribution between 64.5 and 71.5° W and a multimodallatitudinal distribution which is characterised by two groups of basins at 22.5–27.5°S and 37.5–50.0° Sand an almost complete absence of basins between 27.5 and 37.5° S. Problems and sources ofmisinterpretation arising from data quality and resolution are discussed. Further research, targeting in particularthe genesis and potential for paleoenvironmental reconstruction of closed basins in southern Argentina, iscalled for.

  3. Sociologia, peronismo e esquerda na Argentina Sociology, peronism and left in Argentina

    Carlos R. Etulain


    O trabalho discute, o papel do peronismo e os problemas político-ideológicos que ele coloca para a esquerda Argentina. Busca, também, apresentar os principais elementos para uma análise da esquerda frente ao fenômeno do peronismo. Palavras-chave: Peronismo. Esquerda. Trabalhadores. Movimentos sociais. Classes sociais. Capitalismo. Política. This paper presents the role of Peronism and the ideological political problems to be confronted by the Argentinian leftists...

  4. Novelties in Casearia (Flacourtiaceae for Argentina NOVEDADES EN CASEARIA (FLACOURTIACEAE PARA ARGENTINA

    Héctor A. Keller


    Full Text Available

    Casearia obliqua Spreng. (Flacourtiaceae is recorded for the first time to Argentina, based on
    specimens collected beside Iguazú river, in Misiones province. The taxon is here described
    and illustrated. The presence of Casearia gossypiosperma Briq. in Misiones, a tree mentioned
    in 1936 for that province, is here documented by mean herbarium material. A key for identifying
    the argentinean species is included
    Se cita por primera vez para la flora de Argentina, Casearia obliqua Spreng. (Flacourtiaceae,
    sobre la base de ejemplares recolectados junto al río Iguazú, en la provincia de Misiones. Este
    taxón es descripto e ilustrado. Se certifica mediante material de herbario la presencia en
    Misiones de Casearia gossypiosperma Briq., especie arbórea que fue mencionada para dicha
    provincia en 1936. Se incluye una clave para determinar las especies de Casearia de

  5. Jurassic Paleoclimates in Argentina, a review Paleoclimas jurásicos en la Argentina, una revisión

    Wolfgang Volkheimer


    Full Text Available New paleoclimatic evidence from palynologic and vertebrate proxies provides more detailed data on climatic change during the Jurassic in Argentina. Comparison with paleomagnetic data shows that the Neuquén basin shifted from the highest paleolatitudes (50ºS, by the end of the Triassic until the end of the Sinemurian. During the Pliensbachian-Toarcian it moved northward, reaching the lowermost paleolatitudes (25ºS, and subsequently (Middle to Late Jurassic the area moved again and attained eventually a position similar to its present-day position (30ºS. These movements are reflected in the Jurassic palynofloras. The high frequency of the pollen genus Classopollis (Cheirolepidiacean gymnosperms is of special paleoclimatic importance in the Argentinian Jurassic, as it is indicative of seasonal aridity or semiarid conditions during large intervals of this Period. During the shift of the South American continent to the northernmost position, the arrival of an important group of Araucariaceae, represented by Callialasporites spp., in the Toarcian could indicate an amelioration related to more humid conditions. Jurassic dinocyst assemblages studied in the Neuquén basin have proved to be useful paleoclimatic and paleobiogeographic proxies. Abundant remains of marine crocodiles in the Mid- and Late Jurassic of the Neuquén basin indicate warm water temperatures for this basin, probably in excess of 20° C. The occurrence of abundant turtles and other ectothermic vertebrates in the Middle Jurassic Cañadón Asfalto Formation of Chubut is in general accordance with the warm climate indicated for this unit by geologic evidence.Nuevas evidencias de indicadores paleoclimáticos (palinológicos y de vertebrados suministran datos detallados sobre los cambios climáticos en el Jurásico de la Argentina. La comparación con datos paleomagnéticos muestra como, desde fines del Triásico hasta el Sinemuriano Tardío, la cuenca Neuquina derivó ocupando las

  6. The multiple applications of the nuclear techniques in Argentina

    A review is given of the use of nuclear technology in Argentina, especially in the field of the production of radioisotopes and radiopharmaceuticals, nuclear medicine, and industrial applications. The applications of ionizing radiation are also reviewed

  7. Overview in Argentina on spent/disused radiation sources

    The paper describes approaches and practices for management of radioactive waste and spent/disused radioactive sources in Argentina. Information on spent sources inventory, their characteristics, available storage and disposal capacities for radioactive waste is provided. (author)

  8. Regulatory requirements for the management of radioactive wastes in Argentina

    Nuclear activity started in Argentina in the early fifties and since then all the peaceful applications of nuclear energy have been developed including nucleo electricity production. In 1994 the organization in charge of the regulatory control of nuclear activities, now the Nuclear Regulatory Authority (ARN), became independent from the organizations related with nuclear promotion (mainly National Atomic Energy Commission, CNEA). Concerning regulatory activities, the regulatory system applied by ARN in Argentina is based on the IAEA's and ICRP's recommendations, adapted to the needs of the country and its own experience gained through more than thirty years of regulatory activities. Besides, specialists from the regulatory organization from Argentina contributed to the development of the recommendations of such organizations. In order to contribute to the understanding of the application of the nuclear regulatory system in Argentina, an overview of the legal and regulatory framework is provided. (author)

  9. The participation of Argentina in the CTBT verification regime

    Argentina is among the countries involved in the CTBT with seismic, radionuclide and infra sound stations. In May 1998, a Provisional Agreement was signed between the Argentine Ministry of Foreign Affairs and the Executive Secretary of the Provisional technical Secretariat to allow technicians and equipment of the CTBTO to start the harmonization and upgrade of the monitoring stations located in Argentina. It started, through Instituto de Prevencion Sismica (INPRES), participating with the group of Scientific experts at the Conference of Disarmament. Concerning radionuclide monitoring and infra sound technologies Argentina participates with its stations managed by the Nuclear Regulatory Authority. Participation of Argentina in the CTBT is considered as an excellent opportunity for interchanging information and experiences among Argentine experts and experts from other countries

  10. FLORA ARGENTINA: NOVEDADES EN PRIMULACEAE Argentinian flora: novelties in Primulaceae

    Sara G. Tressens


    Full Text Available

    Anagallis filiformis Cham. & Schltdl., especie no mencionada previamente para la Argentina,
    es citada, descripta e ilustrada. Se señala por primera vez A. arvensis L., ampliamente
    extendida en la Argentina, para las provincias de Corrientes y Misiones. Se incluye una clave
    para la identificación de las cuatro especies de Anagallis presentes en el país
    Anagallis filiformis Cham. & Schltdl., species not previously mentioned for Argentina is
    recorded, described and illustrated. A. arvensis L., largely widespread in Argentina, is reported
    for the first time from Corrientes and Misiones provinces. A key for the identification of the four
    species of Anagallis present in the country is also included

  11. Radioactive waste with 14C in Argentina

    14C is a long half-life radioisotope, which is present in radioactive waste generated during the operation and decommissioning of nuclear power plants. 14C can also be found in waste generated by medical diagnostic laboratories or any one generated by fields that deal with research and development (mainly connected with the biochemists area). According to international precedents the disposal of 14C based on the final amount found in radioactive waste and its chemical form have conditioned the design and operation of the facilities (either because of the amount of it or the chemical form in which 14C was present). We have to take into account that the design of facilities for radioactive waste disposal is included among the obligations of the National Radioactive Waste Management Program (PNGRR). It is absolutely necessary to count with enough information about the characteristics of any waste containing 14C that is generated in Argentina, in order to be able to fulfil the requirements previously mentioned. The main characteristics of interest in the frame of the present project are: a) the principal reactions that take place for the formation of 14C; b) The specific concentration of activity in materials where this radio nuclei is formed or is accumulated; c) To know which is the current step in the process of managing these wastes (in Argentina and all over the world). Either if it refers to bulk or conditioned storage, inside the generating facility; d) Transportation possibilities of 14C under these conditions; e) The accumulated volume and the generation rate of this kind of waste in Argentina. This paper presents an initial collection and evaluation of the information related to the characteristics already mentioned, having gathered published material from the literature and information in the PNGRR up to this moment. The description of the characteristics of the radioactive waste containing 14C from nuclear power plants, hospitals and research and

  12. Argentina's regulatory body: its communication activities

    Full text: The Nuclear Regulatory Authority of Argentina (ARN) is empowered to regulate and control the nuclear activity with regard to radiation and nuclear safety, physical protection and nuclear non-proliferation issues. It must also advise the Executive on issues under its purview. The objective of the Nuclear Regulatory Authority is to establish, develop and enforce a regulatory system applicable to all nuclear activities carried out in Argentina. Two of the goals of this regulatory system are to provide an appropriate standard of protection for individuals against the harmful effects of ionizing radiation, and to maintain a reasonable degree of radiological and nuclear safety in the nuclear activities performed in Argentina. The responsibility of the radiation protection community in performing the tasks to accomplish this goals is twofold. On one hand, it must ensure a high technical quality in performing these functions. It must also provide information on its activities which has to be accurate, comprehensive and understandable. The way a society understands the concept of 'risk' needs to be kept in mind. Risk perception is the subjective judgment that people make about the characteristics and severity of a risk. Cultural theory refers to theories of risk perception that focus on culture, rather than individual psychology as an explanation for differences in risk judgments. It is widely agreed that trust is a key factor in influencing people's perceptions of risk. It is understood there are two main ways trust may impact in risk perceptions: an activity is perceived as more risky if the people or agencies managing it are perceived as untrustworthy; and information presented by trusted sources is given more credibility than information from untrusted sources. One of the primary purposes of ARN's Communication Program is to provide a means whereby those engaged in radiation protection activities may communicate more readily with each other and the public and

  13. X-ray fluorescence in IAEA Member States: Argentina

    Full text: The following projects carried out by the XRF Group are described: 1. Iridium Detection by Total Reflection x-Ray Fluorescence in Samples Providing from The Cretaceous-Tertiary Boundary and Experimental Amphibian Embryos - The main purpose of this study is to report the high sensitivity of TXRF for Ir measurements in mineral and biological samples. Mineral samples originate from different horizon deposits in the Neuquen basin, Argentina. Ir anomaly seems to be related to diderophite material provided to Earth in large quantities most probably by a 10 km asteroid that impacted earth 65 Myears ago. Sample preparation procedures and multielemental information are available. In a particular case of amphibian embryos, the detected level of Ir was in the order of 1 part per million (bioconcentration factor of 9). 2. Polymer Solutions on Glass: Adsorption Study by Total Reflection x-Ray Fluorescence - Equilibrium properties of a polymer solution in the vicinity of a solid-liquid interface are locally altered relative to the properties in bulk. This is caused probably by attractive or repulsive interactions adsorbed fraction-adsorbent. In this way, theoretical models for flexible and rod-like polymers were published.The present work is related to study of the adsorption of 0 to 0.05% aqueous scleroglucan solution on 400 to 600 μm glass microspheres. This study was possible by labeling the macromolecule by means of a chemical reaction with iodine, and then detecting by TXRF. Results show that for dilute concentration polymers behave in an anomalous way near the interface, contrary to the previous theoretical predictions. A first attempt to explain this behavior is presented. 3. Total Reflection x-Ray Fluorescence Polymer Spectra: Classification By Taxonomy Statistic Tools - The aim of this work is to explore the use of chemometric tools for the classification of synthetic and natural polymers with a mean molecular weight greater than 106. Spectra obtained by

  14. Phylodynamics of vampire bat-transmitted rabies in Argentina

    Torres, C.; Lema, C; DOHMEN, F. GURY; Beltran, F.; NOVARO, L.; S. Russo; Freire, M. C.; Velasco-Villa, A; Mbayed, V. A.; D. M. CISTERNA


    Common vampire bat populations distributed from Mexico to Argentina are important rabies reservoir hosts in Latin America. The aim of this work was to analyse the population structure of the rabies virus (RABV) variants associated with vampire bats in the Americas and to study their phylodynamic pattern within Argentina. The phylogenetic analysis based on all available vampire bat-related N gene sequences showed both a geographical and a temporal structure. The two largest groups of RABV vari...

  15. Determination the atmospheric fallout in the Argentina Republic

    With the purpose to study the radioactive precipitation present in the Argentina Republic, due to the rehearsal the nuclear weapons in the atmosphere carried out in the past, you implement the environmental sampling outside of the area gives influence the nuclear facilities the Argentina during the years 1996 and 1997. The concentrations were determined Cs 137 and Sr 90 in samples air, radioactive material (rain water), milk, diet standard average and in several foods

  16. Making sense of immigration policy : Argentina, 1870-1930

    Sánchez-Alonso, Blanca


    The aim of this paper is to disentangle the different forces shaping Argentine immigration policy from 1870 to 1930. Although immigration restrictions increased over time Argentina remained relatively open to mass migration until the 1930s in contrast with the United States. The quantitative evidence presented here suggests that there were economic reasons to restrict immigration prior to the 1930s, namely rising inequality and a declining demand for workers. Labour in Argentina would have be...

  17. A Very Active Sprite-Producing Storm Observed Over Argentina

    Thomas, J.N.; Taylor, Michael J.; Pautet, D.; Bailey, M.; Solorzano, N. N.; R. H. Holzworth; McCarthy, M.P.; Kokorowski, M.; Sao Sabbas, F.; Pinto Jr., O.; Cummer, S. A.; Jaugey, N.; Li, J.; Schuch, N. J.


    During the night of 22–23 February 2006, more than 400 middle- atmospheric optical discharges were observed above one large thunderstorm system over northeastern Argentina. These transient luminous events (TLEs) were imaged during the Southern Brazil Sprite Campaign, the first campaign to focus on TLEs over southern Brazil, northeastern Argentina, and Uruguay. All of the TLEs were imaged from the Brazilian Southern Space Observatory (SSO) near Santa Maria, which is nearly in the center of the...

  18. Tareas que realizan los bibliotecarios universitarios en Argentina

    Werner Agazzi; Natalia Tchouldjian


    El presente estudio es una investigación descriptiva que pretende conocer las tareas que realizan los bibliotecarios en las bibliotecas universitarias argentinas, abordando el tema desde la perspectiva de las competencias laborales y el actual perfil del bibliotecario universitario. Mediante la utilización de un cuestionario enviado a las direcciones de e-mail de bibliotecas universitarias argentinas se compilaron datos sobre las tareas que realizan los bibliotecarios en esas instituciones. A...

  19. Reflexiones para una historia del documental en Argentina

    Carmen Guarini


    Full Text Available Documentary cinema has had, in Argentina, an uncertain destination, in some periods it was protagonist, and in others almost disappeared.In this last decade it reached levels of interesting production and quality. It is already a common place to associate this growth to the social situation of crisis since 2001 that overflew in “filmed events”. However, in Argentina documentary possesses a long history that includes fundamental names for its construction.


    Ana Carolina Hecht


    Full Text Available Process of language shift is explained by many researchers since linguistic and anthropological perspectives. This area focuses on the correlations between social processes and changes in systems of use of a language. This article aims to address these issues. In particular, we analyze the links between educational-linguistic policy and the maintenance of the languages spoken in Argentina. In doing so, we explore this field taking into account the linguistic and educational policies implemented about indigenous languages in Argentina.

  1. Phylodynamics of vampire bat-transmitted rabies in Argentina.

    Torres, C; Lema, C; Dohmen, F Gury; Beltran, F; Novaro, L; Russo, S; Freire, M C; Velasco-Villa, A; Mbayed, V A; Cisterna, D M


    Common vampire bat populations distributed from Mexico to Argentina are important rabies reservoir hosts in Latin America. The aim of this work was to analyse the population structure of the rabies virus (RABV) variants associated with vampire bats in the Americas and to study their phylodynamic pattern within Argentina. The phylogenetic analysis based on all available vampire bat-related N gene sequences showed both a geographical and a temporal structure. The two largest groups of RABV variants from Argentina were isolated from northwestern Argentina and from the central western zone of northeastern Argentina, corresponding to livestock areas with different climatic, topographic and biogeographical conditions, which determined their dissemination and evolutionary patterns. In addition, multiple introductions of the infection into Argentina, possibly from Brazil, were detected. The phylodynamic analysis suggests that RABV transmission dynamics is characterized by initial epizootic waves followed by local enzootic cycles with variable persistence. Anthropogenic interventions in the ecosystem should be assessed taking into account not only the environmental impact but also the potential risk of disease spreading through dissemination of current RABV lineages or the emergence of novel ones associated with vampire bats. PMID:24661865

  2. Argentina neodesarrollista : Debates sobre el modelo

    Féliz, Mariano


    En este libro desarrollamos estudios diversos sobre la economía argentina; las políticas públicas y la estructura social; el proyecto de desarrollo en el país y la región; y la dinámica del capitalismo a escala global. En todos los casos, el objetivo de los textos es analítico y pedagógico a la vez. Pretenden aportar a la comprensión de los diversos problemas, presentando elementos de una propuesta superadora partiendo de la crítica de la economía dominante y desde una lectura que se nutra de...


    Sergio A Cáceres Moral


    Full Text Available Dos especies no mencionadas anteriormente de la Argentina son tratadas e ilustradas: Oxypetalum molle Hook. et Arn. y Oxypetalum ineanum Fourn. Oxypetalum appendieulatum Mart. et Zucc., Oxypetalum confusum Malme, Oxypetalum jörgensenii Meyer, Oxypetalum microphyllum Hook. et Arn., Oxypetalum pannosum Decaisne, Oxypetalum stipatum Malme, Funastrum flavum (Decaisne Malme y Blepharodon lineare (Decaisne Decaisne se registran por primera vez para la flora de Corrientes ..

  4. Adequacy features of Nucleoelectrica Argentina Safety Management

    The Argentine Nuclear Power Plants (NPP) ATUCHA I (357 Mw, SIEMENS) and EMBALSE (648 Mw, CANDU), both of PHWR type, were owned and operated until August 94 by the Comision Nacional de Energia Atomica (CNEA). Until that date, CNEA, the national agency for nuclear R and D, concentrated three activities or roles: Research, Nuclear Regulations and NPP Operation. Since August 1994 NPP's are owned and operated by a state electrical company (Nucleoelectrica Argentina S.A.) the nuclear utility supplying 15% of the national electrical generation demand. NASA is going to be privatized according to a recent national law regulating nuclear activities. The transition from a research agency to a commercial company requires the introduction of changes in the management of activities. Mention of these changes is limited to those relating to Safety

  5. Nuclear fuel supply view in Argentina

    The Argentine Atomic Energy Commission promoted and participated in a unique achievement in the R and D system in Argentina: the integration of science technology and production based on a central core of knowledge for the control and management of the nuclear fuel cycle technology. CONUAR SA, as a fuel manufacturer, FAE SA, the manufacturer of Zircaloy tubes, CNEA and now DIOXITEC SA producer of Uranium Dioxide, have been supply, in the last ten years, the amount of products required for about 1300 Tn of equivalent U content in fuels. The most promising changes for the fuel cycle economy is the Slight Enriched Uranium project which begun in Atucha I reactor. In 1997 seventy five fuel assemblies, equivalent to 900 Candu fuel bundles, will complete its irradiation. (author)

  6. Virtual Archaeology in an argentina colonial estancia

    Florencia Vázquez


    Full Text Available This is a first approach to the application of virtual reconstruction techniques of a colonial house. In Argentina it is still uncommon to perform 3D modeling of archaeological sites and especially in historical archeology. As a first step, we used the Google SketchUp to model the country house located on the banks of the Río de la Plata (Buenos Aires. It has historical significance because it belonged to a Spanish councilman, housed hundreds of slaves and was the place where stayed the troops that carried out the Second British Invasion of Buenos Aires. In this case, the 3D modeling was useful for evaluating the future excavationa and activities of preservation of cultural heritage.

  7. Researching quality of life in Argentina

    Graciela Tonón


    Full Text Available The study of quality of life considers at the same time objective and subjective circumstances of people life. In 1995 was created the International Society for Quality of Life Studies (ISQOLS whose purposes are to promote and encourage research in the field of quality-of-life studies and provide an organization through which all academic and professional researchers interested in QOL studies may coordinate their efforts to advance the field of QOL studies within various disciplines. In the case of Argentina since 2004, the Facultad de Ciencias Sociales, Universidad Nacional de Lomas de Zamora has organized the Research Program in Quality of life to develop different kind of projects about quality of life in different fields, trying to be considered by national institutions that decide public policies. 

  8. Low temperature thermochronology and topographic evolution of the South Atlantic passive continental margin in the region in eastern Argentina

    Pfister, Sabrina; Kollenz, Sebastian; Glasmacher, Ulrich A.


    To understand the evolution of the passive continental margin in Argentina low temperature thermochronology is an appropriate method, which will lead to new conclusions in this area. The Tandilia System, also called Sierras Septentrionales, is located south of the Río de la Plato Craton in eastern Argentina in the state of Buenos Aires. North of the hills Salado basin is located whereas the Claromecó basin is situated south of the mountain range. In contrary to most basins along the southamerican passive continental margin the Tandilia-System and the neighbouring basins trend perpendicular to the coast line. The topography is fairly flat with altitudes of. The igneous-metamorphic basement is pre-proterozoic in age and build up of mainly granitic-tonalitic gneisses, migmatites, amphibolites, some ultramafic rocks and granitoid plutons it is overlain by a series of Neoproterozoic to early Paleozoic sediments (Cingolani, 2010), like siliciclastics, dolostones, shales and limestones (Demoulin et al., 2005). The aim of the study is to quantify the long-term landscape evolution of the passive continental margin in eastern Argentina in terms of thermal history, exhumation and tectonic activities. For that purpose, samples were taken from the Sierra Septentrionales and analyzed with the apatite fission-track method. Further 2-D thermokinematic modeling was conducted with the computer code HeFTy (Ketcham, 2005; Ketcham 2007; Ketcham et al., 2009). The results indicate apatite fission track ages between 101.6 (9.4) to 228.9 (22.3) Ma, what means all measured ages are younger as their formation age. That shows all samples have been reset. Six samples accomplished enough confined tracks and were used to test geological t-T models against the AFT data set. These models give a more detailed insight on the cooling history and tectonic activities in the research area. References: Cingolani C. A. (2010): The Tandilia System of Argentina as a southern extension of the Río de la

  9. Paleoenvironmental reconstruction in the western lacustrine plain of Llancanelo Lake, Mendoza, Argentina

    Violante, R.; Osella, A.; Vega, M. de la; Rovere, E.; Osterrieth, M.


    Lakes are key sites for studying paleoclimates. Llancanelo Lake (southern Mendoza Province, western Argentina) is an endoreic, highly saline water body located in the southern extreme of a tectonic basin, the Central or Huarpes Depression. The lake is located between the Andean Cordillera, San Rafael Block and Payenia Volcanic Field. The lake evolved as a major regional depocenter during the Pliocene-Quaternary, hence it contains important thicknesses of intra and extra basinal clastic and evaporitic sediments mainly dominated by volcaniclastic products. The main conditioning factors in the lake evolution were arc and back-arc volcanism as well as climatic changes. Geomorphological and sedimentary evidence supports the hypothesis that the lake was in past times larger than in present days. This paper estimates the lake's former extension on the western lacustrine plain using electromagnetic induction (EMI) and geoelectricity (Multielectrode Resistivity Meter) surveys, as well as shallow wells, along an 8 km long transect perpendicular to the lake's western shoreline. The geophysical and sedimentological information, as well as microfaunal studies, lab analysis and petrographic/EDAX determinations, support the presence, in the subsoil, of a lacustrine sequence at least 30 m thick composed mainly of volcaniclastic sediments. Volcanic eruptions and climatic changes influenced the evolution of the lake, producing intercalations in the lacustrine sedimentary sequences of ash layers, evaporites, soils, and eolian and swamp deposits.

  10. 222Rn Measurements in Dwellings of Argentina

    Radon gas (222Rn) is responsible of about fifty per cent of the world population dose due to natural sources, being the most important pathway the inhalation of radon progeny, specially indoors. Radon concentration has been measured in dwellings at different locations in Argentina. The places selected to be evaluated are representative of the different geologic zones of the country. Near 3000 dwellings have been analyzed since 1983 up today. The measuring methods used in this case were track etched detectors, electrets and detectors based on activated charcoal adsorption. Two different methods with track etched detectors were used: a simple one, which determines only the average radon concentration, and a second one that measures both radon concentration and the equilibrium factor (F) between radon and its daughters. The last one is a method that uses two Makrofol passive track detectors in the same device. The average radon concentration value obtained from all the dwellings evaluated was 44.2 Bq.m-3. The annual effective dose calculated from this average concentration, using a dosimetric factor of 25 μSv.a-1.(Bq.m-3)-1, which assumes an equilibrium factor of 0.4, was 1.11 mSv. The average value obtained from the 222 dwellings evaluated by the second method was 49.3 Bq.m-3 and 0,37 the equilibrium factor, resulting the annual effective dose estimated 1,44 mSv. The measured equilibrium factor of 0,37 allows us to verify the assumed equilibrium factor of 0,4. Finally, radon levels in dwellings of Argentina are within the acceptable values for population, not being necessary to implement remedial actions, except in isolate cases that are still under study. (authors)