ANÁLISIS MORFOTECTÓNICO EN EL PIEDEMONTE SUROCCIDENTAL DEL ANTEPAIS ANDINO, SIERRAS PAMPEANAS OCCIDENTALES, SAN JUAN, ARGENTINA

ROTHIS, M; PERUCCA, L; SANTI MALNIS, PAULA; PANTANO, A.; ALCACER, JUAN MANUEL; HARO, FEDERICO; VARGAS, HORACIO

GEOCIENCIAS

UNESP

Lugar: SAN PABLO; Año: 2018 vol. 37 p. 55 - 74

0101-9082

Between 27° S and 33° S the Andean backarc is one of the most seismically active region in the world, being epicenter ofthe most important crustal earthquakes that affected Argentina. Associated with the seismicity an intense deformation occurs, causingchanges on the land surface morphology. In the western sector of the Sierras Pampeanas Occidentales, in the Sierra de la Huerta, a GISanalysis was applied to define geomorphological units and obtain qualitative and quantitative parameters that allowed characterizing theidentified geoforms and their relation with tectonic activity. Andean tectonics affect this region for the last 5 millions of years, controlling itlandscape evolution. Three morphostructural units and quaternary active faulting were identify, presenting abundant morphotectonicmarkers, such as dislocated alluvial levels, changes in river pattern, diversion of river courses, increasing degree of incision, water springs,wind gap and inversion of the pattern drainage, among others. The quantitative and qualitative analysis of the morphotectonic parametersshows that deformation decrease from North to South and increase from East to West. Concluding, according to morphotectonics parametersdeformation is still active, modifying the present-day landscape in the Western piedmont of La Huerta range