ANÁLISE DE PROVENIÊNCIA, IDADES U-Pb DA FONTE, MATURIDADE TEXTURAL E PALEOCORRENTES DO GRUPO MARICÁ (EDIACARANO DO RIO GRANDE DO SUL)

Abstract

The aimof this work is summarize the results ofprovenanee and paleocurrents analyses ofMarice group (Ediacaran of Rio Grande do Sui state).These analyses show that source areas were composed of granite rocks (alkalis feldspar granite and granite with garnet) tonalities and, in minor proportion, quartzite, quartz vein and volcanic rocks. According to geochronological analyses ofcobble samples, these source areas developed during Archean and Paleoproterozoic.The provenance and paleocurrents suggest that Riode La Plata Craton rocks were the most important source area, and the Rio Vacaca! terrain and Dom Feliciano belt were the basements units of tile Camaquf basin during tbeMarice group evolution.These evidences, the high texturalmaturity and facies analyses suggest that Merica group developed ill HIl intracratonic basin with no related to the Brasiliano Orogeny.