CHRONOLOGY OF NEOPROTEROZOIC-CAMBRIAN GRANITIC MAGMATISM IN THE ARAÇUAÍ BELT, EASTERN BRAZIL, BASED ON SINGLE ZIRCON EVAPORATION DATING

Abstract

Granitic magmatism related to the orogenic stages of the Araçuaí Belt took place at 595-575 Ma, and are represented by two distinct suites. One is composed of I-type granitoids and includes the following plutons: Brasilândia (595±3 Ma), São Vitor (576±4 Ma) and Guarataia (574±2 Ma). The other suite comprises S-type granites like the Ataléia (591±5 Ma) and Wolf (582±5 Ma) plutons. After a long period of magmatic quiescence, a batholith composed of the Caladão granite and Padre Paraíso charnockite intruded at 519±2 Ma. This magmatic episode is probably associated to the collapse of the orogen.