Resumo

PERUCCA, Laura P; PANTANO, Ana  e  VARGAS, Nicolás. El braquianticlinal de Loma Negra: una estructura de plegamiento cuaternario en la Precordillera Central, provincia de San Juan. Rev. Asoc. Geol. Argent. [online]. 2014, vol.71, n.3, pp.427-433. ISSN 0004-4822.

Several evidences of Quaternary active faulting and folding were recognized on the eastern piedmont of the Sierra de Talacasto in Central Precordillera. In this paper we present the preliminary results of geomorphological studies carried out in the Loma Negra anticline and major Quaternary deformation structures are described. Morphotectonic expression of the identified active faults includes counter-slope or favor-slope scarps and different levels of hanging and / or tilted alluvial fans, progressive unconformities, recent folding of Pleistocene fanglomerates and control of the drainage network. Morphotectonic evidence in the Quaternary deposits indicates a progressive deformation eastward, dominated by reverse faulting and folding that migrate in this sense.

Palavras-chave : Quaternary deformation; Fold; Precordillera; Neotectonics; Vergency.

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