Paleoclimatic and paleoenvironmental evolution of the Early Neoproterozoic basal sedimentary cover, dolomitic platform, of the Río de La Plata Craton, Argentina: implications of the δ13C chemostratigraphy

PROF. ALCIDES N. SIAL DR. M. JULIA ARROUY DR. SEBASTIÁN RICHIANO PROF. VALDEREZ P. FERREIRA PROF. ALAN J. KAUFMAN PROF. DANIEL G. POIRÉ; LUCÍA E. GÓMEZ PERAL

SEDIMENTARY GEOLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2017 p. 139 - 157

0037-0738

The Sierras Bayas Group of the Tandilia System constitutes theNeoproterozoic sedimentary cover of the Río de La Plata Craton inArgentina deposited during the breaking of Rodinia to the Gondwanaconfiguration. C- and O-isotope chemostratigraphy among four sections ofdolostones (~ 40m thick) of the Villa Mónica Formation allows a strongintrabasinal correlation. This section is composed of stromatolitic andlaminated dolostones with interbedded thin claystone levels developed inshallow marine environments showing a general regression pattern. Thebasal portions of the Upper Villa Mónica Formation display negative δ13Cvalues that turns to 0? in the middle section and then to positiveupwards. C- and O-isotope chemostratigraphic patterns from preserveddolomicrite, plus the presence of a discrete level of diamictite withdropstones followed by a phosphogenesis event just below the dolostones,may suggest this succession as deposited from post-glacial meltwater....