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GEOQUÍMICA DOS GNAISSES TTGs E GRANITÓIDES NEOARQUEANOS DO COMPLEXO BELO HORIZONTE, QUADRILÁTERO FERRÍFERO, MINAS GERAIS

1997; Sociedade Brasileira de Geologia; Volume: 27; Issue: 1 Linguagem: Inglês

10.25249/0375-7536.19972532

ISSN

2177-4382

Autores

Carlos Maurício Noce, Wilson Teixeira, NUNO MACHADO,

Tópico(s)

Geochemistry and Geologic Mapping

Resumo

COMPLEX, QUADRILÁTERO FERRÍFERO, MINAS GERAIS The Archean crust of the Quadrilátero Ferrífero region comprises a greenstone belt (Rio das Velhas Supergroup) surrounded by metamorphic complexes (e.g.Belo Horizonte, Bonfim and Bação metamorphic complexes).The Belo Horizonte Complex is located to the north of the Quadrilátero Ferrífero.It is composed of a migmatitic banded gneiss with schlieren and stromatic structures and mafic enclaves, and intrusive granitoid bodies.The banded gneiss is the dominant rock type within the Belo Horizonte Complex and is hereafter referred to as Belo Horizonte gneiss.The major and trace element characteristics of the Belo Horizonte gneiss are similar to those of Archean tonalite-trondhjemite-granodiorite (TTG) suites described from other continents.The gneiss protholit was probably emplaced in the 3.0-2.9Ga time span.Neoarchean granitogenesis (ca.2.7 Ga) in the Belo Horizonte Complex is represented by the Santa Luzia, General Carneiro and Ibirité granitoids.They are well foliated and rather homogeneous plutons.The Santa Luzia and General Carneiro plutons are calc-alkaline and slightly peraluminous granites with génesis probably related to the reworking of the older TTG gneisses.

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