San Martín, Argentina
San Martín, Argentina
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Micheletti M.I.,CONICET | Debray M.,Gerencia de Investigacion Y Tecnologia | Murruni L.,SEGEMAR | Avila Cadena G.,Observatorio Pierre Auger | And 6 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.

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.

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.

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.

Casa A.L.,SEGEMAR | Casa A.L.,University of Buenos Aires | Casa A.L.,National University of La Plata | Yamin M.G.,SEGEMAR | And 5 more authors.
Revista de la Asociacion Geologica Argentina | Year: 2010

Along the eastern front of the Sierra de Velasco and at the southern end of the Sierra de Ambato, western Sierras Pampeanas, have been found new evidences of Quaternary tectonic activity near La Rioja city. Observed evidences correspond to different reactivated sections of the faults that bound the mountain fronts, as well as to structures affecting the Quaternary deposits on the piedmont. The bounding faults of the Sierra de Velasco Oriental-front exhibit a NNE trend and WNW dip, while structures at the southernmost Ambato range are characterized by NE trend and NW dip. The neotectonic faults of the El Carrizal block are the result of the interference of both structural trends, resulting in a sector with higher structural complexity. The here described deformation show the persistence of a compressive regime during the Quaternary, with eastern to southeastern verging reverse faults. It is considering that these faults are driving the current uplift of the mountain ranges and constitute potential earthquake sources.

Wick E.,University of Lausanne | Baumann V.,SEGEMAR | Favre-Bulle G.,University of Lausanne | Jaboyedoff M.,University of Lausanne | And 3 more authors.
Revista de la Asociacion Geologica Argentina | Year: 2010

In this paper is presented a study dealing with the debris flows that reached the national road 7 in January 2005, in the km 1,118.5, Mendoza province. The area is located in the Frontal Cordillera near the limit of the Precordillera. A detailed geomorphologic map has been realized for this study using a Quickbird satellite imagery of the year 2006. Various calculations of volumes, velocities and peak discharges have been performed with the field data and using a geographic information system (GIS). The geomorphologic survey has permitted to propose three propagation scenarios in case of a new event. These allowed creating a map of debris flows susceptibility for the stretch of the road that has been studied. Finally, it has been proposed protection and mitigation measures, based on the results of the study, to protect the road from a new event.

Miranda F.,SEGEMAR | Lema H.,SEGEMAR
Boletim Paranaense de Geosciencias | Year: 2013

The Republic of Argentina has a long history in what concerns natural heritage protection. However, the more specific concept of geological heritage is relatively new. Its comprehensive treatment began in early 90s, when some institutions and professionals from various domains developed an interest for this topic. Many have been individual efforts but today it is necessary to work together with continuity in time and under a proper legal framework. This contribution presents an update of some actions done in recent years and others being presently carried out. Finally, somethoughts about the future of geoconservation in Argentina are presented.

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.

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