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Revista de la Asociación Geológica Argentina
Print version ISSN 0004-4822
Abstract
CISNEROS, Héctor; COSTA, Carlos H. and GARDINI, Carlos. Neotectonic analysis of the Cerro Salinas area, Sarmiento department, province of San Juan. Rev. Asoc. Geol. Argent. [online]. 2010, vol.67, n.4, pp.439-449. ISSN 0004-4822.
The so called Cerro Salinas is one of the southernmost expressions of the Sierras Pampeanas crystalline basement. Several fault traces with N-S-trending rectilinear scarps have been recognized at its surroundings, affecting Tertiary and Quaternary deposits. The attitude of the neotectonic faults emplaced at the hanging-walls controlled by bedding and the main lithologic contacts of the Tertiary units, which in turn has been interpreted as a result of flexural-slip folding related to the Andean shortening. This situation is quite similar to the neotectonic style of the Eastern Precordillera. According to space distribution and geometries attributes of the neotectonic deformation, the analyzed area was divided into three main sections. The main neotectonic structure (Cerro Salinas fault) is the west-bounding structure of the pre-Quaternary deposits with a recognized outcropping length of 15,77 km. Field data suggest that main deformation is related to reverse-propagating faults. Chronological discrimination among Quaternary morphostratigraphic units was based upon multiparameter data and the signature of the alluvial surfaces on Landsat ETM+ and ASTER images, through the principal components method. Considering the cumulative displacement of the surveyed scarps, an uplift rate of 0.13 mm/yr has been estimated for the Late Pleistocene.
Keywords : Neotectonic; Cerro Salinas; Andean deformation; Quaternary.