Metamorphic evolution and P-T path of gneisses from Goias Magmatic Arc in southwestern Goias State

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Data

2013-06-01

Autores

Navarro, Guillermo R. B. [UNESP]
Zanardo, Antenor [UNESP]
Conceicao, Fabiano Tomazini da [UNESP]

Título da Revista

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Título de Volume

Editor

Soc Brasileira Geologia

Resumo

In the southwestern Goias State, the rocks of the Goias Magmatic Arc present mineral assemblages typical of the amphibolite facies. Thermobarometric calculations show that P and T conditions for associations involving amphibole + biotite + kyanite + staurolite + garnet + plagioclase + muscovite, biotite + garnet + plagioclase + muscovite, amphibole + biotite + garnet + plagioclase, belong to the middle amphibolite facies in the staurolite-kyanite field, reaching temperatures and pressure higher than 600 degrees C and 7 kbar, respectively. The P-T path is clockwise and the values obtained by thermobarometric calculations are interpreted as a retrometamorphic reequilibrium in the amphibolite facies.

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Palavras-chave

Brasilia Belt, Goias Magmatic Arc, mineral chemistry, thermobarometry

Como citar

Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 2, p. 301-315, 2013.