IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Revisión de la posición del polo paleomagnético de Sierra Chica en la curva de desplazamiento polar aparente del Gondwana
Autor/es:
RENATA N. TOMEZZOLI; HAROLDO VIZÁN; HUGO TICKYJ; MARIA E. WOROSZYLO
Lugar:
Montevideo
Reunión:
Simposio; Third Biennial Meeting of Latinmag; 2013
Institución organizadora:
Universidad de la República
Resumen:
Tunas Formation (Permian) outcrops at the east area of Sierras Australes (Buenos Aires province, Argentina) and it continues on subsurface in the Claromecó Basin. It is integrated by fine to medium sandstones alternating with mudrocks, which contains detritic hematite. An AMS study is carried out to evaluate the internal deformation, at different stratigraphic levels of Tunas Formation, with the aim of determining direction and magnitude of the main efforts which had acted on this formation and to relate them with compaction studies. Results show that the Kmax poles trend NW-SE, close to the regional axial fold trend and Kmin have good consistence with the pole of the bedding plane, placed in a girdle perpendicular to Kmax. The Kmin positions changes from the horizontal at the bottom of the sequence to the vertical at the top of the sequence showing in this position a clear sedimentary fabric. These changes in the Kmin axis positions have proved a decrease of the deformation intensity toward the foreland basin. The NW trend of the Kmax axes implies a SW-NE compression in concordance with the regional compression pattern along the Gondwanaland margin. The results fit in the compaction degree that shows a decrease from west to the east.