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BIBTEX RIS

GEOTERMOBAROMETRIA EM ROCHAS DO COMPLEXO CAMPOS GERAIS AO NORTE DA ZONA DE CISALHAMENTO VARGINHA

1994; Sociedade Brasileira de Geologia; Linguagem: Inglês

10.25249/0375-7536.1994233239

ISSN

2177-4382

Autores

ELIANE APARECIDA DEL LAMA, Marcos Aurélio Farias de Oliveira, Antenor Zanardo,

Tópico(s)

Geography and Environmental Studies

Resumo

VARGINHA SHEAR ZONE.Electron microprobe chemical analysis of mineral species from rocks of the southern part of Campos Gerais Complex, São Pedro da União-Nova Resende region (MG) show that the analysed species have a relatively homogeneous composition and that their paragenesis and geothermometric calculations indicate that the peak metamorphism took place at temperatures of 830-900°C and pressures of 12.5-15.0kbar, the most common values being of 700-750°C and 11.8-12.1 kbar.The average geothermal gradient was of 21°C/km is obtained and is similar to that of the Araxá-Canastra Group.The general estimated metamorphic conditions are of high pressure, at least higher than the Barrowian type.

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