GEOCHRONOLOGIC AND GEODYNAMIC IMPLICATIONS OF PALAEOMAGNETIC

RAPALINI, AUGUSTO E.; POIRÉ, DANIEL G.; TRINDADE, RICARDO; RICHARTE, D.

Bariloche

Simposio; VI South American Symposium on Isotope Geology; 2008

SSGI

The apparent polar wander path (APWP) of the Rio de la Plata craton (RP) for the Late Proterozoic and Early Paleozoic is of significance to reconstruct the tectonic processes that led to the amalgamation of Gondwana. In order to define the Ediacaran-Cambrian APWP for RP, a systematic paleomagnetic study was carried out in the Sierras Bayas Group and the Cerro Negro Fm exposed in the province of Buenos Aires, Argentina. 328 samples from 44 sites were collected in the Cryogenian to Ediacaran Villa Mónica Fm., the Ediacaran Cerro Largo, Olavarría and Loma Negra Fms. and the Cambrian (?) Cerro Negro Fm. Sampling was carried out in limestone, dolomite, red claystone and marls, and it was accompished in the type-localities of Olavarria and Barker.