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

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

Congreso; Latinmag 2019; 2019

Asociación Latinoamericana de Paleomagnetismo y Geomagnetismo

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