Abstract

MIRA CARRION, Andrés; VEROSLAVSKY, Gerardo; VIVES, Luis  and  RODRIGUEZ, Leticia. Influencia de los lineamientos estructurales sobre el flujo del Sistema Acuífero Guaraní en la provincia de Corrientes. Rev. Asoc. Geol. Argent. [online]. 2016, vol.73, n.4, pp.478-492. ISSN 0004-4822.

It is known the tectonic influence on the groundwater flow, especially in large aquifers like the Guaraní Aquifer System. In its southern portion, the groundwater flow has a significant uncertainty due to the lack of geological and hydrogeological information. In this paper, a map of lineaments in the Corrientes province (NE Argentina) and its surrounding area is shown. It was constructed from Landsat-ETM satellite images and the SRTM digital elevation model, which allowed us to analyse the tectonic influence in the Guaraní Aquifer System according to the new advances in the knowledge of the deep geological characteristics of the study area. The methodology consisted of multiple tests and measurement reproducibility. Three morpho-structural domains have been identified according to their areal density and lineament orientations. From the hydrogeological point of view, the south-eastern domain is very important because it has the greatest density in NW-SE lineaments, reflecting the higher degree of fracturing. As a result, confining basalts would have a higher equivalent permeability and there would be a higher connectivity between the shallow aquifers and the Guaraní Aquifer System. This may explain, according to the recent hydrochemical studies, the mixing processes between deep and old saline groundwater with precipitation recharge in this area.

Keywords : Tectonic deformation; Morpho-structural domains; Hydrogeology; Landsat-ETM; Digital Elevation Model.

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