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José de San Martín, Argentina

Gilabert U.,SEGEMAR | Gilabert U.,National Technological University of Rosario | Gilabert U.,CONICET | Moyano E.,CNEA CAC | And 3 more authors.
Journal of Crystal Growth | Year: 2010

Hg1-xCdxTe (MCT) epilayers were grown on (1 1 1)Cd, (1 1 1)Te, (1 1 0) and (1 0 0) CdZnTe and CdTeSe substrates by isothermal vapor phase epitaxy (ISOVPE). The growth kinetics of the epilayers were studied by a non-linear diffusive convective model for the ISOVPE MCT growth, which was assessed in a previous paper . The non-linear diffusion-convection problem, which describes ISOVPE MCT film growth, was numerically solved by means of discrete mathematics. As the theoretical and experimental composition profiles were remarkably different in accordance with the epilayers grown over pure CdTe substrates, in the model a finite rate in the surface reaction rate constant that enabled a good fit was assumed. The numerical value of the surface reaction rate constant was similar for all the studied substrates and crystalline orientations, hence the results enabled us to determine that the deposition rate has a mixed control for the experimental conditions of this work. This isotropic characteristic of the ISOVPE technique for pure and alloyed CdTe substrates is remarkable, quite different from other MCT growth techniques as MBE or MOCVD. © 2010 Elsevier B.V. All rights reserved. Source


Allard J.O.,National University of Patagonia San Juan Bosco | Paredes J.M.,National University of Patagonia San Juan Bosco | Foix N.,National University of Patagonia San Juan Bosco | Foix N.,CONICET | Giacosa R.E.,SEGEMAR
Revista de la Asociacion Geologica Argentina | Year: 2014

Cretaceous connexion between the Golfo San Jorge and Cañadón Asfalto Basin (Patagonia): paleogeography, tectonostratigraphic implications and their potential in the hydrocarbon exploration. The Chubut Group (Cretaceous) of the Golfo San Jorge Basin begins with a fluvial-lacustrine depositional system associated with the Matasiete-Pozo D-129 Formations (Barremian?-Aptian). This contribution evaluates the correlation among the Matasiete Formation and its temporalyequivalent units in the Cañadón Asfalto Basin. The fluvial succession of the Los Adobes Formation was characterized in cañadón Puelman and cerro Punta Toro Hosco, in the northwestern margin of the basin. The fluvial sandbodies have a mean maximum thickness (T) of 7 m, a mean real width/maximum thickness ratio (W/t) of 10 and paleoflow direction toward 168º. The Cerro Fortín Formation was analyzed near cerro Ferrarotti; the fluvial channels have mean values of T: 4,6 m, W/t: 16, and a mean paleoflow direction toward 162º. The Matasiete Formation outcrops downstream of both localities and its fluvial channels show a mean T: 7,3 m, W/t: 14 and a paleotransport direction toward S-SE. A similar lithological appearance, uniform paleoflow directions and comparable geometries of the paleochannels support the physical correlation among the above-mentioned lithostratigraphical units. By using modern analogues, a minimum drainage area of ~160000 km2 was estimated for the Pozo D-129 Formation, with individual watersheds of ~4000 km2. The results support a paleogeographic scenario with regional fluvial systems that flow from the northnorthwest using tectonically-driven sedimentary corridors. The characterization of a continental depositional system connecting areas of the Cañadón Asfalto and Golfo San Jorge basins defines potential guidelines for prospecting hydrocarbon reservoirs in frontier areas. © 2014, Asociacion Geologica Argentina. All rights reserved. Source


Marquez M.J.,SEGEMAR | Marquez M.J.,National University of Patagonia San Juan Bosco | Massaferro G.I.,National University of Patagonia San Juan Bosco | Massaferro G.I.,CONICET | Fernandez M.I.,National University of Patagonia San Juan Bosco
Revista de la Asociacion Geologica Argentina | Year: 2010

Marifil Complex volcanic facies that crop out in the locality of Arroyo Verde, SE slope of Macizo de Somún Cura, are described here. Rhyolitic ignimbrite facies, pyroclastic breccias, traquitic domes and vitreous domes, and rhyolitic dikes are distinguished. Field relationships point out the ignimbrites as the first effusive event. Some sporadically block and ash flows are intercalated within the ignimbrites. These deposits were intruded by domes; the latest event is represented by the intrusion of the rhyolitic dykes. Chemical composition of these rocks varies between high K rhyolites and traquites, which correspond to typical characteristics of the Marifil Complex rocks. The observations allow proposing a fissural mechanism of eruption for these facies in this locality. Source


Micheletti M.I.,CONICET | Debray M.,Gerencia de Investigacion Y Tecnologia | Murruni L.,SEGEMAR | Davidson J.,Gerencia de Investigacion Y Tecnologia | And 4 more authors.
AIP Conference Proceedings | Year: 2010

We applied the PIXE (Particle-Induced X-ray Emission) technique to samples of atmospheric aerosols collected in filters in the Auger South Observatory, Malargüe, Argentina, with instrument Andersen Graseby 240. We analyzed the concentration PM2.5, PM2.5-10 and PM10 by gravimetric analysis and the elemental composition of fine (size <2.5 μm) and coarse (size between 2.5 μm and 10 μm) particles by PIXE technique. We complemented the elemental study with microscopic analysis, SEM/EDX. We discuss the concentration levels in the region, which in general are very low. We focus our analysis in winter and spring results. We find that concentration levels increase with increasing temperatures in the region. Most chemical elements have higher elemental concentrations in the coarse aerosols, but sulfur has higher elemental concentrations in fine aerosols. © 2010 American Institute of Physics. Source


Pesce A.H.,SEGEMAR
Transactions - Geothermal Resources Council | Year: 2013

The purpose of the paper is: (1) to review what is known about the Domuyo geothermal area, Neuquén, Argentina, (2) to present a preliminary model of the system, (3) to outline possible future exploratory studies, and (4) to inform about the latest efforts to explore and develop the geothermal resource. Source

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