MIDDLE TO LATE EDIACARAN MAGNETOSTRATIGRAPHY OF THE AVELLANEDA FORMATION, RIO DE LA PLATA CRATON

AFONSO JHON ; MARIA JULIA ARROUY; AUGUSTO E. RAPALINI; RICARDO TRINDADE; PABLO R. FRANCESCHINIS; DANIEL G. POIRÉ

Congreso; Latinmag 2019 Proceedings Rancagua, Chile; 2019

The Avellaneda Formation represents an opportunity to access magnetic field information of the middle to late Ediacaran world, a critical period for the Earth. We performed a preliminary magnetostratigraphy study from data obtained in marls of the Avellaneda Formation (La Providencia Group) exposed in the Río de la Plata craton. Two drill cores were sampled (TSE-34 and TSE-7). Paleomagnetic analyses by standard stepwise thermal demagnetization revealed a high-temperature and dual polarity components persistent in both drill core analysed. As result, the presence of one normal and reversed polarity zone has potential for providing a timescale that could be applied to constrain sediment accumulation rates, estimate the duration of geological events, and construct a high-resolution chronostratigraphy that may be a useful marker for global correlation.