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A SEQÜÊNCIA VULCANOSSEDIMENTAR DO GRUPO NOVA LIMA NA REGIÃO DE PIEDADE DO PARAOPEBA, BORDA OESTE DO QUADRILÁTERO FERRÍFERO, MINAS GERAIS

1992; Sociedade Brasileira de Geologia; Volume: 22; Issue: 2 Linguagem: Inglês

10.5327/rbg.v22i2.408

2317-4889

Carlos Maurício Noce, Stelamaris O. Pinheiro, Eduardo A. Ladeira, Cláudia R. Franca, Senira Kattah,

Geography and Environmental Studies

Piedade do Paraopeba is located at western Quadrilatero Ferrifero, where a 15 km long tectonic slice of Nova Lima Group rocks are stacked between the gneissic rocks of the Bonfim Complex and the basal Minas Supergroup formation (the Moeda Quartzite). The southern part of the Nova Lima sequence consists of ultramafic and mafic metavolcanics with local preserved pillow structures, minor felsic metavolcanics, metachert and thin carbonate and oxide iron formation. This sequence grades northwards to an interlayered sequence of carbonaceous phyllites, quartz-mica schists, volcanoclastic metarenites, and iron formation. The metavolcanic rocks underwent intense metassomatic alteration. Chemical analyses show that the ultramafic rocks are probably former komatiitic peridotites while the upper mafic rocks are tholeitic basalts. A polyphasic structural evolution has been distinguished in the area. The main deformation phase (Dn) led to basal thrusts with a W-NW tectonic transport.