Produção Nacional
A NOTE ON SMALL BODIES OF ECLOGITE AS INCLUSIONS IN HIGH GRADE GNEISSES NORTH OF POUSO ALEGRE, MINAS GERAIS
1978; Sociedade Brasileira de Geologia; Volume: 8; Issue: 1 Linguagem: Inglês
10.25249/0375-7536.19786368
ISSN2177-4382
AutoresCHOUDHURI ASIT, FIORI ALBERTO PIO, WINTERS ANDREAS A. M., BETTENCOURT JORGE S., RODRIGUES JOSÉ E.,
Tópico(s)Geological and Geochemical Analysis
ResumoIn the area north of Pouso Alegre, Minas Gerais, small eclogite bodies occur included in high grade anatectic gneisses and are briefly described in this preliminary note. The eclogite consists of garnet, clinopyroxene - plagioclase symplectite and hornblende; the symplectitic pyroxene - plagioclase intergrowth is typical of eclogites from gneiss migmatite terrains and results from exsolution of plagioclase components from the original omphacite. The enclosing gneissic country rocks are garnet - biotite gneisses with newly formed sillimanite and remnants of kyanite. From field and petrographic evidence it is provisionally interpreted that the eclogites formed by dehydration of pre-existing metamorphosed basic rocks, such as amphibolites, during high pressure anatexis of the gneisses.
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