Geobarometría en gneises del techo y el piso de la falla de la Sierra Chica y su relación con la tectónica y cuencas cretácicas, Sierras de Córdoba, Argentina

MARTINO, ROBERTO DONATO; GUERESCHI, ALINA BEATRIZ; CARIGNANO, CLAUDIO ALEJANDRO

Mar del Plata

Congreso; VIII Congreso de Exploración y Desarrollo de Hidrocarburos; 2011

Instituto Argentino del Petróleo y el Gas

The Sierra Chica fault is one of the three more important faults of the Sierras Pampeanas of Córdoba. This structure has a long heritage, mainly the influence of the Cretaceous extensional faulting and their later reversion during the Tertiary compression. The Cretaceous tectonic produced a pervasive extension, mainly localized along the present Sierra Chica fault. According to geobarometric data obtained from the exhumed blocks, the throw was between ~5 km (Alta Gracia latitude, 31º 36´ S) and ~12 km (La Calera latitude, 31º 21´ S). At the present time, to the latitude of Alta Gracia, the hangingwall and the footwall are connected by the reverse Sierra Chica fault that uplifts the eastern block on the western one but, in spite of that, a geobarometric difference of at least 5 km is still preserved between both blocks, which would be effect of the Cretaceous extensional deformation.