Significado tectónico de terremotos anómalamente profundos en el Lineamiento Ojo de Agua, Sierras Pampeanas de Córdoba

ROBERTO D. MARTINO; ANA CARO MONTERO; ALINA B. GUERESCHI

San Miguel de Tucumán

Congreso; XX Congreso Geológico Argentino; 2017

Universidad Nacional de Tucumán

The Sierras de Córdoba belong to the Andean foreland and are the easternmost uplifted ranges of the Sierras Pampeanas geology province of Argentina. They are composed of Neoproterozoic-Paleozoic basement arranged in N-S aligned mountain ranges, limited by W-vergent reverse faults and thrust, reactivated or formed by compressive tectonic during the Andean orogeny. The ranges are also affected by oblique sub-vertical lineaments, NW-SE direction, seismic actively. Their uplifting is conditioned by the Cenozoic tectonic effect in the Andean foreland, coinciding with a sector of low-angle inclination of the Nazca plate beneath the South American plate, since 12 Ma to present. The seismicity registered shows many clusters in different sectors of the ranges, where the cluster between Pampa de Pocho and Sierra Grande, NW of the Sierras de Córdoba, reflected the Ojo de Agua lineament seismicity and it has been modeled in this work to established its depth structure. It follows from this analysis that the continental lithosphere under the Sierras de Córdoba would be colder and more rigid than in an area with normal subduction, causing seismicity to depths greater than 40 km, below Mohorovicic discontinuity, penetrating slightly into the upper mantle.