ANFIBÓLIOS DO CORPO ANFIBOLÍTICO DO JARAGUÁ, SP

CELSO DE BARROS COMES, MARIE CLEIRE VAN OOSTERWYCK-GASTUCHE, CLÁUDIO VIEIRA DUTRA

Resumo


As a consequence of rising temperature, probably caused by the Cantareira granitic intrusion, the Jaraguá amphibolites have suffered changes in petrographic and chemical composition. Although no complete equilibrium has been attained, they did respond sufficiently to the new metamorphic conditions as indicated by very diagnostic mineralogical and textural features. For the amphiboles, the petrographic evidences have been made up of an increase in grain size in addition to the recrystallization with the crystals showing granoblastic shape and poiquiloblastic texture, as well as the actinolite breakdown into hornblende. The chemical evidences have mainly consisted of a slight aluminum and titanium enrichment.

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