ASPECTOS PETROLÓGICOS DO COMPLEXO GRANÍTICO SOCORRO (SP/MG): DADOS ANALÍTICOS E DISCUSSÃO PRELIMINAR

EBERHARD WERNICK, PAUL K. HORMANN, ANTONIO CARLOS ARTUR, HANS EULERT

Resumo


Chemical data concerning 30 rock analysís from the granitic Socorro Complex (State of São Paulo and Minas Gerais) are presented together with a prelimínary interpretation. The data are compatible with the main lithochemical characteristics of the I-type granits and Magnetite-type granites. However, the genetic interpretation based on geological, petrographic and chemical features shows that the Socorro Complex magma ís the result of a mantle-crust interaction resulting in a hybrid character, intermediate between true crustal and pure mantle derived granites. In this way the I-type granít must be no longer considered as a simple product of fusion of deep seated orthogneísses as advocated by several authors.

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