IDADE DO METAMORFISMO DE ALTO GRAU NO COMPLEXO ANÁPOLIS-ITAUÇU, GOIÁS, DETERMINADA PELO MÉTODO Sm-Nd
1998; Sociedade Brasileira de Geologia; Volume: 28; Issue: 4 Linguagem: Inglês
10.25249/0375-7536.1998543544
ISSN2177-4382
AutoresDANDELLE PIUZANA FISCHEL, Márcio Martins Pimentel, Reinhardt A. Fuck,
Tópico(s)Geological and Geochemical Analysis
ResumoDETERMINED BY THE Sm-Nd METHOD The Anápolis-Itauçu Complex, in Goiás, is a high-grade terrane including granites, mafïc-ultramafic bodies as well as sediments, ali metamorphosed in granulite facies.One sample of a granitoid body metamorphosed in granulite facies, containing sillimanite and garnet, was investigated using the Sm-Nd method.The mineral isochron, including analyses of garnet, monazite and biotite concentrates, indicates an age of 633 ± 28 Ma and 8Nd(T) of ca.-7.0.This is interpreted as the best estimate so far of the age of the high-grade metamorphism in the Anápolis-Itauçu Complex and represents the first typically Brasiliano (600 ± 30 Ma) age for high-grade rocks in the Brasília Belt.
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