Sample records for CONCRECIONES (sinters)
from WorldWideScience.org

Sample records 1 - 20 shown. Select sample records:



2

The hot spring and geyser sinters of El Tatio, Northern Chile

Fernandez-Turiel, J. L.; García-Vallés, M.; Gimeno, D.; Saavedra Alonso, Julio; Martínez-Manent, S.
2005-10-15

Digital.CSIC (Spain)

3

Mineralogical characterization of silica sinters from the El Tatio geothermal field, Chile

García-Vallés, M.; Fernandez-Turiel, J. L.; Gimeno, D.; Saavedra Alonso, Julio; Martínez-Manent, S.
2008-01-01

Digital.CSIC (Spain)

4

Sintering kinetic of Bi4Ti3O12 based ceramics

Jardiel, Teresa; Caballero Cuesta, Amador; Villegas, Marina
2006-05-01

Digital.CSIC (Spain)

5
6

Sintering and properties of lead-free (K,Na,Li)(Nb,Ta,Sb)O3 ceramics

Rubio Marcos, Fernando; Ochoa, P.; Fernández Lozano, José Francisco
2007-01-01

Digital.CSIC (Spain)

7

Sintering behaviour of ceramic wastes from zinc hydrometallurgy

Montanaro, L.; Bianchini, N.; Rincón, Jesus Ma.; Romero, Maximina
2001-01-01

Digital.CSIC (Spain)

8

Sintering behaviour of steatite materials with barium carbonate flux

Vela, E.; Peiteado, M.; García, F.; Caballero, A. C.; Fernández Lozano, José Francisco
2007-01-01

Digital.CSIC (Spain)

10

Sintering behaviour of ceramic bodies from contaminated marine sediments

Romero, Maximina; Andrés, Ana; Alonso, Rebeca; Viguri, Javier; Rincón López, Jesús María
2008-01-01

Digital.CSIC (Spain)

13

Reaction Sintering of Mexican Dolomite – Zircon Mixtures

Rodríguez Galicia, J. L.; Fernández Arguijo, B.; Rendón-Angeles, J. C.; Pena Castro, María del Pilar; Valle Fuentes, Francisco José; López-Cuevas, J.
2005-07-01

Digital.CSIC (Spain)

14

Conventional sintering of LAS-SiC nanocomposites with null thermal expansion coefficient

García-Moreno, Olga; Fernández, Adolfo; Torecillas, Ramón
2011-03-24

Digital.CSIC (Spain)

15

Spark plasma sintering of hydrothermally derived ultrafine Ca doped lanthanum chromite powders

Rendón-Angeles, J. C.; Rivas-Vázquez, L. P.; Pech-Canul, M. I.; López-Cuevas, J.; Díaz de la Torre, S.; Pena Castro, María del Pilar; Yanagisawa, K.
2006-07-01

Digital.CSIC (Spain)

16

Alumina/tungsten nanocomposites obtained by Spark Plasma Sintering

Rodríguez Suárez, Teresa; Díaz Rodríguez, Luis Antonio; Torrecillas San Millán, Ramón; López Esteban, Sonia; Tuan, W.-H.; Nygren, M.; Moya Corral, José Serafín
2009-07-02

Digital.CSIC (Spain)

17

THERMAL AND SINTERING CHARACTERIZATION OF A IGCC SLAG

Acosta, Anselmo; Iglesias, Isabel; Aineto, Mónica; Romero, Maximina; Rincón, Jesus Ma.
2002-01-01

Digital.CSIC (Spain)

18

Synthesis and Sintering of Si3N4 Obtained by the SHS Process

García Cano, Irene; Rodríguez Barbero, Miguel Ángel
2006-01-24

Digital.CSIC (Spain)

19

Doping method for the sintering of alpha-alumina and polycrystalline alpha-alumina material

Suárez Menéndez, Marta; Fernández Valdés, Adolfo; Torrecillas San Millán, Ramón; Menéndez Río, José Luis; Pecharromán García, Carlos
2009-04-23

Digital.CSIC (Spain)

22

Complex impedance spectroscopy study of a liquid-phase-sintered -SiC ceramic

Sánchez-González, J.; Ortiz, A.L.; Guiberteau, F.; Pascual, C.
2007-01-01

Digital.CSIC (Spain)

23

Microwave-Assisted Reaction Sintering of Bismuth Titanate-Based ceramics

Caballero Cuesta, Amador; Jardiel, Teresa; Villegas, Marina
2006-01-01

Digital.CSIC (Spain)

24

Effect of firing temperature on sintering of porcelain stoneware tiles

Martín-Márquez, Jorge; Rincón López, Jesús María; Romero, Maximina
2008-01-01

Digital.CSIC (Spain)

25

Phase evolution and microstructural characterization of sintered ceramic bodies from contaminated marine sediments

Romero, Maximina; Andrés, Ana; Alonso, Rebeca; Viguri, Javier; Rincón López, Jesús María
2009-01-01

Digital.CSIC (Spain)

27

Travertinos y jasperoides de Manantial Espejo, un ambiente Hot Spring Jurásico: Macizo del Deseado, Provincia de Santa Cruz, Argentina/ Travertines and jasperoids of the Manantial Espejo, a Jurassic hot spring environment: Macizo del Deseado, Santa Cruz Province, Argentina

Echeveste, Horacio
2005-07-01

Resumen en español En este trabajo se analiza el origen y las relaciones entre travertinos y jasperoides intercalados en rocas volcaniclásticas jurásicas en el distrito argento-aurífero Manantial Espejo, ubicado en el borde sur-occidental del Macizo del Deseado, provincia de Santa Cruz, Argentina. Los cuerpos de travertino constituyen estratos delgados de hasta 60 cm de espesor de calcita micrítica finamente laminada, en ocasiones con estratificación rítmica de calcita y ópalo, asoci (mas) ados a depósitos de tobas de caída y tufitas de ambiente lacustre. En algunos afloramientos, los morfotipos reconocidos revelan que la precipitación del carbonato correspondía a sectores proximales relacionados a geisers y conductos de vapor, los cuales se orientaban a los largo de las fracturas que constituyeron los canales de circulación de fluidos. La posterior silicificación de los niveles carbonáticos produjeron jasperoides que se presentan como cuerpos tabulares subverticales y subhorizontales, estos últimos con características texturales similares a aquellas de sinters. La silicificación se originó tardíamente, posiblemente durante la etapa principal del régimen hidrotermal que generó las vetas portadoras de plata y oro. Los travertinos se formaron en un ambiente de hot spring, relacionado con fracturas de un sistema de cizalla conjugado orientadas entre N 20° a 45° E y N 20° a 40° O y constituyen las evidencias más tempranas de la presencia de un régimen epitermal asociado al proceso volcánico jurásico, en un régimen tectónico distensivo, en Manantial Espejo. Resumen en inglés In the last few years, an intense mining prospecting activity for gold and silver epithermal deposits has been carried out in the Deseado Massif, Argentina. As a result, many hot spring related deposits, of possible Jurassic age, have been detected. This paper describes the mineralogical and textural characteristics as well as the facies of a group of travertine and jasperoid outcrops occurring near the silver-gold carrying lodes in the Manantial Espejo prospect (Schalamu (mas) k et al., 1998). A genetic interpretation of the deposits is done on the basis of their structural, textural, and emplacement characteristics. Their possible relationship with the epithermal mineralization is also considered. The Manantial Espejo district is located on the southwestern area of the Deseado Massif, in the middle of the province of Santa Cruz (Fig.1). The area is almost entirely covered by andesitic and rhyolithic rocks of the Bajo Pobre and Chon Aike Formations, the product of a strong, bimodal volcanic activity of Jurassic age. This volcanic event developed in a back-arc tectonic environment linked to the opening of the Atlantic Ocean (Uliana et al., 1985; Riley et al., 2001). Acidic rocks prevail in the area, consisting on high-grade ignimbrites with ash fall tuffs, tuffites, and hydroclastic breccias (Fig. 2). Among them, the chemical and biogenic carbonate and silica deposits, are present (Fig.3). The travertine mantles can be up to 0.5 m thick and, in most of cases, they overlie tuffite layers. Typically, the rock is laminated in millimetrical to submillimetrical laminae of dense, hard, non porous micritic carbonate, displaying three types of lamination: parallel sub-horizontal; stromatolithic; and, «en echelon» (possibly, a terrace facies, Fig. 4). Sometimes, the laminated structure consists of a rhythmic deposit of calcium carbonate and opal (Figs. 5 a, b), unusual association in hot spring deposits, both recent and fossil (Jones et al., 2000a; Campbell et al., 2002; Canet et al., 2005). A variety of porous travertine, dominated by small, sub-spherical and columnar growths, of the microstromatolithic or the oncoid types. The travertine layers grade laterally to siliceous laminated jasperoids (sensu Spur, 1898 and Lovering, 1972), which make sub-horizontal mantles, 0.5 to 2.0 m thick, with identical sedimentary structures as those of travertines, although they are entirely formed of chalcedony, which is interpreted as the product of replacement of calcite into silica (Fig. 6a, b). Silicification occurred at a later stage, during the intense hydrothermal alteration accompanying the formation of the quartz veins carrying gold and silver. Some jasperoid outcrops show grossly stratified, rounded surfaces with domical structures, forming banks 0.2 to 0.4 m thick, and showing a more or less concentric layout which could correspond to the silicification of bio-built algal structures (Fig. 6b). The occurrence of small vents (Fig. 6e) show the water and steam outlets. Vertical, tabular, laminated bodies, filling fractures of NE-SW strike and slip up to 1,000 m, and 3 m thick (Fig. 6f, h). They are formed of chalcedony, displaying a vertical, banded and, at times, diffuse (Fig. 6g) or breccia like structure. The morphology of the travertines and associated jasperoids in the Manantial Espejo district are compared with travertines or hot spring deposits in general, of Quaternary or Recent (Guo and Riding, 1999; Chafetz and Guidry, 2003; Hancock et al., 1999). The analogies founded allowed to reconstruct, at least in part, the depositional environment of the studied rocks (Fig. 8). The sub-vertical, tabular bodies of banded silica, would correspond to subsurface levels of fissure ridges, where erosion has generally eliminated the surface deposits with sub-horizontal stratification overlying the faults. The northernmost end of the Ayelen Oeste «vein» (Fig. 6h) would correspond to the proximal zone of the discharge channel, very close to the fissure, since part of the sub-horizontal stratification next to the fracture (zone B in Fig. 8). This area represents the most active depositional environment, where the carbonate precipitation rate is higher. Figure 6e shows a fluid outlet vent in a spring zone (zone C, in Fig. 8). The «en echelon» stratification shows very similar characteristics to those of terraces and micro-terraces occurring in modern hot springs. Micro-terraces shown in Figure 5e, found near one of the fissure crests, could correspond to those formed laterally to the outlet channels (D, in Fig. 8). As to that shown in Figure 5f, associated to travertine with sub-horizontal, parallel lamination, could correspond to that formed in the edges of pools. With regard to the parallel lamination of micritic carbonate, occurring in most of the outcrops, it may correspond to the lacustrine rims (sensu Pentecost, 1995). This type of thin lamination, forming laterally extended banks, several tens of decimeters thick, would have formed on depressed surfaces, with a distal position relative to the spring zones. The rhythmic intercalation of thin opal laminae between the calcite layers occurring in some outcrops, reveals temporary changes in the physical-chemical conditions of the mineral precipitation, possibly seasonal temperature fluctuations. Finally, the observed stromatolites and microstromatolites (Fig. 5c, g, h) indicate the presence of microorganisms in the geothermal environment. Although there is no agreement among researchers about the organic or inorganic origin of these morphotypes in geothermal environments, it is admitted that algae and bacteria induce the precipitation of calcium carbonate. The stratigraphic position of the calcareous levels identified in Manantial Espejo show that the hot spring environment began to develop early in the district, associated to an extensional tectonic regime coincident with the La Frisia or Zanjón del Pescado System (Reimer et al., 1996) which caused fracturing (direct faults) N 20° to 45º E, and N 20º to 40° W, as a consequence of aó1 located around 0°. The produced faults, made the main hydrothermal fluid circulation channels (barren) which, after reaching the surface and losing the dissolved CO2, precipitated the calcium carbonate. The migration of the maximum stress (anti clockwise, at 315°) produced a new stress field, the Bajo Grande System (Panza, 1982, 1984) generating direct faulting combined with dextral movement, at a 110° azimuth, cutting and displacing the subvertical travertine bodies. These new fluid circulation channels end up lodging the quartz veins carrying silver and gold.

Scientific Electronic Library Online (Spanish)

28

YSZ/Ni–YSZ semi-cells shaped by electrophoretic deposition

García, P.; Ferrari Fernández, Begoña; Moreno, Rodrigo; Sánchez-Herencia, A.J.; Colomer, M.T.
2007-01-01

Digital.CSIC (Spain)

29

Varistors based in the ZnO–Bi2O3 system: Microstructure control and properties

Peiteado, Marco; Fernández Lozano, José Francisco; Caballero, A. C.
2007-01-01

Digital.CSIC (Spain)

30

Valorisation of contaminated marine sediments to produce ceramic construction materials

Romero, Maximina; Andrés, Ana; Alonso, Rebeca; Viguri, Javier; Rincón López, Jesús María
2009-11-01

Digital.CSIC (Spain)

32

Sinterización de vidrios del sistema RO-BaO-SiO2 (R= Mg, Zn) para el sellado de SOFC

Lara, C.; Pascual Francisco, María Jesús; Durán Carrera, Alicia Amparo
2007-03-01

Digital.CSIC (Spain)

33

Room temperature mechanical properties of high alumina refractory castables with spinel, periclase and dolomite additions

Díaz, Luis Antonio; Torrecillas San Millán, Ramón; Simonin, F.; Fantozzi, Gilbert
2008-06-09

Digital.CSIC (Spain)

34

Rapid densification by using Bi2O3 as an aid for sinterin of gadolinia-doped ceria ceramics

Gil, V.; Tartaj, J.; Moure Jiménez, Carlos; Durán Botia, Pedro
2007-01-01

Digital.CSIC (Spain)

36

Properties related phase evolution in porcelain ceramics

Carbajal, L.; Rubio Marcos, Fernando; Bengochea, M. A.; Fernández Lozano, José Francisco
2007-01-01

Digital.CSIC (Spain)

37

Processing parameters for ZnO-based thick film varistors obtained by screen printing

Rubia, Miguel Ángel de la; Peiteado, Marco; Fernández Lozano, José Francisco; Caballero Cuesta, Amador; Frutos, J. de; Holc, J.; Drnovsek, S.; Kuscer, D.; Macek, S.; Kosec, M.
2006-05-01

Digital.CSIC (Spain)

38

Posibles actuaciones para la minimización del impacto ambiental de los humos de la sinterización siderúrgica

García Carcedo, Fernando; Ayala, J. Nancy; Isidro, A.; Moro, A.; Cornejo, N.; Ferreira, S.; Hernández Fernández, Ángel; Cobo Guzmán, Antonio; Alaiz, E.; García, J. R.
2004-08-30

Digital.CSIC (Spain)

39

Piezo-spectroscopic characterization of alumina-aluminium titanate laminates

Portu, Goffredo de; Bueno, Salvador; Micele, Lorenzo; Baudín, Carmen
2006-01-01

Digital.CSIC (Spain)

41

Obtención de materiales antifricción hierro-arrabio-latón utilizando residuos de virutas de arrabio

Nasamov, S. N.; Krivij, N.; Gudenau, H. W.; Babich, A.; García Sánchez, L. L.; Formoso Prego, Antonio; Cores Sánchez, A.
2003-06-30

Digital.CSIC (Spain)

42

Nucleation and crystal growth of glasses produced by a generic plasma arc -process

Hernández Crespo, M.ª Soledad; Romero, Maximina; Rincón López, Jesús María
2006-01-01

Digital.CSIC (Spain)

43

Nonlinear I–V electrical behaviour of doped CaCu3Ti4O12 ceramics

Leret, Pilar; Fernández Lozano, José Francisco; Frutos, J. de; Fernández Hevia, D.
2007-01-01

Digital.CSIC (Spain)

44

New Approach to the β→α Polymorphic Transformation in Magnesium-Substituted Tricalcium Phosphate and its Practical Implications

García Carrodeguas, Raúl; Aza Moya, Antonio H. de; Turrillas, Xavier; Pena Castro, María del Pilar; Aza Pendas, Salvador de
2009-01-01

Digital.CSIC (Spain)

45

Negative thermal expansion of lithium aluminosilicate ceramics at cryogenic temperatures

García-Moreno, Olga; Fernández, Adolfo; Khainakov, Sergei; Torrecillas San Millán, Ramón
2010-01-01

Digital.CSIC (Spain)

50

Influencia de las diferentes etapas de procesamiento sobre la microestructura de dispositivos multicapa basados en PZT

Jardiel, Teresa; Villegas, Marina; Fernández Lozano, José Francisco; Solera Carlavilla, María Elena
2002-01-01

Digital.CSIC (Spain)

52

Improved non-linear behaviour of ZnO-based varistor thick films prepared by tape casting and screen printing

Rubia, Miguel Ángel de la; Peiteado, Marco; Frutos, J. de; Rubio Marcos, Fernando; Fernández Lozano, José Francisco; Caballero, A. C.
2007-01-01

Digital.CSIC (Spain)

53

High-temperature mechanical behaviour of flaw tolerant alumina–zirconia multilayered ceramics

Bermejo, R.; Sánchez-Herencia, A.J.; Llanes, L.; Baudín de la Lastra, Carmen
2007-01-01

Digital.CSIC (Spain)

54

Forming of Ceramic Laminates Comprising Thin Layers of a Few Particles

Nicolaidis, Ilias; Gurauskis, Jonás; Baudín de la Lastra, Carmen; Moreno, Rodrigo; Sánchez Herencia, Antonio Javier
2009-01-01

Digital.CSIC (Spain)

55

Estudio del proceso de sinterización reactiva en sistemas con dolomita mediante termodifractometría de neutrones

Aza Moya, Antonio H. de; Turrillas, Xavier; Rodríguez Galicia, J. L.; Pena Castro, María del Pilar
2004-01-01

Digital.CSIC (Spain)

56

Estudio de sinterización del Y2SiO5

Aparicio Ambrós, Mario; Durán Carrera, Alicia Amparo
1998-02-01

Digital.CSIC (Spain)

57

Estudio de la degradación de elementos refractarios de alúmina en la sinterización de aceros modificados con Mn

Pena Castro, María del Pilar; Sicre-Artalejo, J.; Campos, M.; Torralba Castelló, José Manuel; Zbiral, J.; Danniger, H.
2008-09-01

Digital.CSIC (Spain)

58

Estudio de la adición de K+ y LiNbO3 en las propiedades finales del Relaxor PMN procesado por mezcla de polvos

Cavalheiro, A. A.; Zaghete, M. A.; Cilense, M.; Villegas, Marina; Fernández Lozano, José Francisco; Varela, J. A.
2004-05-01

Digital.CSIC (Spain)

59

Engrosamiento anormal de partículas submicronicas de BaTiO3 durante la primera etapa de sinterización

Caballero Cuesta, Amador; Villegas, Marina; Moure Jiménez, Carlos; Durán Botia, Pedro; Fernández Lozano, José Francisco
1999-12-01

Digital.CSIC (Spain)

61

Effect of stoichiometry and milling processes in the synthesis and the piezoelectric properties of KNN-modified nanoparticles by solid state

Rubio Marcos, Fernando; Romero Fanego, Juan José; Martín-González, Marisol S.; Fernández Lozano, José Francisco
2010-06-30

Digital.CSIC (Spain)

62

Effect of ZnO on the microstructure and electrical properties of WO3-Bi4Ti3O12 ceramics

Villegas, Marina; Jardiel, Teresa; Caballero Cuesta, Amador
2009-01-01

Digital.CSIC (Spain)

63

Efecto de la relación área-volumen en la sinterización de varistores cerámicos basados en ZnO-Bi2O3

Rubia, Miguel Ángel de la; Peiteado, Marco; Fernández Lozano, José Francisco; Caballero Cuesta, Amador
2002-01-01

Digital.CSIC (Spain)

64

Edad de las terrazas y diques travertínicos de las Lagunas de Ruidera y sus implicaciones paleoclimáticas

Martínez Goytre, J.; Hentzsch, B.; López Vera, F.; Martínez-Frías, J.
1988-04-30

Digital.CSIC (Spain)

66

Corrosion behavior of powder metallurgical stainless steels in urban and marine environments

Bautista, A.; Velasco, F.; Guzmán, S.; Fuente, Daniel de la; Cayuela, F.; Morcillo, Manuel
2006-06-30

Digital.CSIC (Spain)

67

Control of Functional Microstructure in WO3-Doped Bi4Ti3O12 Ceramics

Jardiel, Teresa; Rubia, Miguel Ángel de la; Peiteado, Marco
2008-01-01

Digital.CSIC (Spain)

68

Control del avance del frente de llama en el lecho de sinterización de minerales de hierro

Cores Sánchez, A.; Mochón Muñoz, J.; Ruiz Bustinza, I.; Parra, R.
2010-06-30

Digital.CSIC (Spain)

69

Continuous in situ functionally graded silicon nitride materials

Belmonte, Manuel; González-Julián, Jesús; Miranzo, Pilar; Osendi, María Isabel
2009-03-25

Digital.CSIC (Spain)

71

AlN ceramics processed by aqueous slip casting

Olhero, S. M.; Miranzo, Pilar; Ferreira, J. M. F.
2006-10-01

Digital.CSIC (Spain)