Paleontología y Geoquímica de la Formación Agua de la Zorra Triásico Medio a Superior de la Cuenca Cuyana, Provincia de Mendoza

CECILIA A. BENAVENTE; ADRIANA C. MANCUSO; TOMÁS PEDERNERA; GEORGINA ERRA; FERNANDO LARRIESTRA; EDUARDO G. OTTONE

San Miguel de Tucuman

Congreso; XX Congreso Geológico Argentino; 2017

Asociación Geológica Argentina

PALEONTOLOGY AND GEOCHEMISTRY FROM THE AGUA DE LA ZORRA FORMATION, MIDDLE TO UPPER TRIASSIC OF THE CUYO BASSIN, MENDOZA PROVINCE. The Agua de la Zorra Formation deposits represent a lacustrine system. The unit includes Corystospermales, together with Equisetales and Osmundales, conchostracans, fish scales and reptile bones. The lower section would correspond to a delta deposits with scarce kerogen; the paleoflora includes complete to fragmented leaves and stems. The upper part would represent prodelta to offshore lacustrine deposits, bearing variable amounts of non-fluorescent amorphous kerogen; the megaflora remains are relatively small, broken and disarticulated. The stacking pattern shows a progressive deepening of the lacustrine system what correlates with an increase upwards of the abundance of organic matter (OM) preserved. The increase of the K/Rb ratio to the top of the section, suggests a terrigenous origin to the kerogen of the deepest horizons of the lake. The analysis of the Cr/Zr ratio, in consonance with the presence of V, would indicate the existence of basic rocks in the provenance area of the basin.