Publication: Caracterización geofísica y mineralógica de las formaciones superficiales de la Cuenca del río Loa (desierto de Atacama, Chile)
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Publication Date
2016
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Sociedad Geológica de España
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Abstract
Durante 2015 tuvo lugar una exploración geotécnica y geofísica en el desierto de Atacama (Chile) para el diseño de una planta solar fotovoltaica. Los datos de resistividad obtenidos en la Fm. El Batea resultaron extremadamente elevados (107Ω•m), por lo que se llevó a cabo un muestreo de las unidades geológicas presentes para su estudio mineralógico mediante difracción de rayos X (DRX). La composición mineral de la Fm. El Batea muestra una casi total ausencia de humedad y una muy baja porosidad. Estos factores producen que la componente electrolítica en esta formación sea casi despreciable, y su comportamiento eléctrico coincide con la conductividad de sus fases minerales casi en estado puro. Estas características se deben a las extremas condiciones ambientales en el desierto de Atacama. La formación El Batea ha supuesto una barrera a la evapotranspiración, siendo los valores de resistividad de la formación infrayacente prácticamente normales (103-104Ω•m).
During 2015 it took place a geotechnical and geophysical exploration in the Atacama Desert (Chile) for the design of a power solar plant.Resistivity data obtained in El Batea Fm. were extremely high (107Ω·m). For this reason, sampling of near surface geological units were made in order to study its mineralogical composition with X-Ray Difraction (XRD). Mineral composition of El Batea Fm. shows an almost total absence of water and a very low porosity. These factors cause that the electrolytic component in this formation is almost negligible, and its electrical conductivity matches with the conductivity of the pure mineral phases. These characteristics are probably due to the extreme environmental conditions. El Batea Fm. has a barrier to evapotranspiration, because the resistivity values of the lower formation are practically normal (103-104Ω·m).
During 2015 it took place a geotechnical and geophysical exploration in the Atacama Desert (Chile) for the design of a power solar plant.Resistivity data obtained in El Batea Fm. were extremely high (107Ω·m). For this reason, sampling of near surface geological units were made in order to study its mineralogical composition with X-Ray Difraction (XRD). Mineral composition of El Batea Fm. shows an almost total absence of water and a very low porosity. These factors cause that the electrolytic component in this formation is almost negligible, and its electrical conductivity matches with the conductivity of the pure mineral phases. These characteristics are probably due to the extreme environmental conditions. El Batea Fm. has a barrier to evapotranspiration, because the resistivity values of the lower formation are practically normal (103-104Ω·m).