Resumen

PERUCCA, Laura P  y  ONORATO, Romina. Faults with Quaternary activity in the Matagusanos-Maradona-Acequión tectonic depression between the ríos de la La Flecha and del Agua, San Juan province. Rev. Asoc. Geol. Argent. [online]. 2011, vol.68, n.1, pp.39-52. ISSN 0004-4822.

Evidence of Quaternary faults between two structural systems with regional N-trending strike and opposite vergence occur at the depression located between La Flecha and del Agua rivers; the east-verging thin-skinned Central Precordillera and the west-verging, thick-skinned Eastern Precordillera. Several Quaternary faults have been recognized across the whole depression. Those located in the eastern sector near Cerro La Chilca, show the structural style of Precordillera Oriental: east-dipping reverse faults with a high angle on the surface. On the contrary, faults located at the eastern piedmont of Cordón de Las Osamentas have a structural style consistent with Precordillera Central, reverse faults and east vergence. This structural arrange of Quaternary faults with opposite vergence was compared with those described at Matagusanos depression, where a triangular zone of thick-skinned type is located close to the western sector of the depression and with the zonda valley, located in the northern sector of the study area.

Palabras clave : Neotectonics; Geomorphology; Reverse faulting; El Mocho; Las Osamentas.

        · resumen en Español     · texto en Español     · Español ( pdf )