IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Evolución de la deformación paleozoica a lo largo del margen sudoccidental del Gondwana.
Autor/es:
ARZADÚN, G; GALLO, L.C.; BATTLER, J.M.; TOMEZZOLI, R.N.; TICKYJ, H.; OCHOA, M.J.; CRISTALLINI, E.O.; CALVAGNO, J.M.
Lugar:
Querétaro
Reunión:
Congreso; Latinmag; 2017
Institución organizadora:
Latinmag
Resumen:
The Lolén Formation, of Devonian age, outcrops in the Sierras Australes area of the Buenos Aires Province. Paleomagnetic and anisotropy of magnetic susceptibility (AMS) studies were carry out in rocks from Las Acacias farm (38° 04.2´ S, 61° 52.7? W). Its results are integrated with others obtained along the Southwest Gondwana margin from the Sierras Australes to the Agua Escondida (South of Mendoza province) localities. The geological evolution of this region is still a subject of debate. Rocks of different lithologies and ages ranging from Late Devonian to Permian-Triassic were studied. Each locality has its own magnetic signature, with a gradual development in the tectonic expression of AMS. For rocks of Permian age there is a clear regional magnetic signature indicating a NW-SE elongation direction and a NE-SW shortening. However, the AMS patterns obtained in the oldest rocks are complex, probably as the results of stress interference in the magnitudes, space and time with different pulses of the orogenic activity. This deformation have been related with the collision of Chilenia and Patagonia with Gondwana during the Middle Devonian (Chañica orogenic phase) accommodating the postcolisional compressive deformation up to the Permian (San Rafael orogenic phase) with latitudinal and longitudinal movements.