Caracterização geológica e geoquímica das intrusões de rochas metamáficas e félsicas nos mármores do sul do Espírito Santo

Abstract

A great amount of metamafic and felsic rocks occurs as concordant or as concordant tabular concordant or discordant intrusions into marbles of Paraíba do Sul Group, in the South area of Espírito Santo State. Felsic rocks comprise two litotypes: monzogranite and syenogranite. The monzogranites have calc-Alkaline signatures and the syenogranites present postcollision alkaline signatures, whereas the metamafic rocks included MORB-E and calc-Alkaline basalts to basaltic andesites. Metamafic and felsic rocks are the remnants of three magmatic stages in Paraíba do Sul Group history: opening of Paraíba do Sul Basin (MORB-E); collision during Gondwana assembly, recorded by calc-Alkaline basic magmatism; and the Brazilian (Pan-African) Orogeny closing, recorded by transition from high-K calc-Alkaline/calc-Alkaline to alkaline felsic magmatism during the orogen collapse.