Abstract

PERUCCA, Laura et al. Fallas cuaternarias con vergencias opuestas entre precordillera central y oriental, provincia de San Juan. Rev. Asoc. Geol. Argent. [online]. 2013, vol.70, n.2, pp.291-302. ISSN 0004-4822.

We herein present numerous evidence of Quaternary deformation within the fill of the Matagusanos-Maradona-Acequión depression, located between the Precordillera Central and Oriental, in the San Juan province of central-western Argentina. The Pleistocene-Holocene alluvial fill of this depression is crosscut by north-south trending thrust faults, arranged in two major trends of opposite vergency: a thin-skinned east verging one, very similar to the Precordillera Central style of deformation, and a second basement-involved west-verging one, resembling the structural style of the Precordillera Oriental, fact indicating the presence of a thick-skinned triangle zone. This structural configuration is present along most of this tectonic depression, although varying the position of the axis of this triangular area to the east and west.

Keywords : Precordillera; San Juan; Triangular zone; Matagusanos-Maradona-Acequión depression.

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