GEOCRONOLOGIA DO GABRO DE MATA GRANDE, MUNICÍPIO DE SÃO SEPÉ, ESTADO DO RIO GRANDE DO SUL

ROBERTO SILVA ISSLER, RENATO ANTÔNIO CHDIAY DRESCH, ARI ROISENBERG

Resumo


Two K-Ar age determinations has been done in basic rocks of the Mata Grande Area, São Sepé township, State of the Rio Grande do Sul. The basic rocks are gabbros (coronites) and form the central part of a former submarine flow that constitute part of the ophiolitic belt from Cerro da Cria - Mata Grande - Arroio da Cavalhada. These gabbros are old and the results are grouped around 2034 m.Y. This magmatic cycle is an important geotectonic episode or the Precambrian of Southern Brazil.

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