IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Late Paleozoic limestones tracked paleo pole wander path: evidence from Western Gondwana
Autor/es:
ROSSELLO, EDUARDO; LOPEZ GAMUNDI, OSCAR; RAPALINI, AUGUSTO E.; TOHVER, ERIC
Lugar:
Antofagasta
Reunión:
Congreso; 13er Congreso Geológico Chileno; 2012
Institución organizadora:
Universidad Católica del Norte - Sociedad Geológica de Chile
Resumen:
As ice centres migrated across the Gondwana supercontinent during the Late Paleozoic, so did climatically-sensitive deposition. The apparent polar wander path is therefore the first order control of such migration. The Gondwanan Icehouse Period (also known as the Late Paleozoic Ice Age) spanned between the mid-Carboniferous and Early Permian waning by the early Late Permian. Early postglacial sea-level rise favoured transgressions of previously ice-covered coastal areas and creation of accommodation space with potential for anoxic events in the newly inundated shelves and peat-forming conditions favoured by rapid water table rise in updip positions in the basin. This postglacial climatic amelioration, evidenced by dropstone-free postglacial mudstones and coals, was continued, in some shallow marine basin margins where clastic sediment input was minimal, by conditions favourable to carbonate precipitation. A significant number of exposures of Late Paleozoic limestones have been identified along the paleo-Pacific margin of western Gondwana. Recent biostratigraphic and paleomagnetic studies allow now to better constrain the age and paleolatitudinal position of these limestones, suggesting that these deposits, like glacial deposits and the subsequent, fine-grained, postglacial transgressive deposits, track the APWP.