Otro
Química mineral e estimativas de pressão e temperatura em rochas metassedimentares do grupo araxá na região de morrinhos, sul do estado de goiás
Registro en:
Geologia USP - Serie Cientifica, v. 11, n. 2, p. 3-20, 2011.
1519-874X
10.5327/Z1519-874X2011000200001
2-s2.0-80052251414.pdf
2-s2.0-80052251414
Autor
Navarro, Guillermo Rafael Beltran
Zanardo, Antenor
Da Conceição, Fabiano Tomazini
De Moraes, Renato
Simões, Luiz Sergio Amarante
Resumen
In the Morrinhos region, Goiás state, Brazil, the rocks of the Araxá Group have mineral assemblages related to the metamorphic peak which occurred in this region and is typical of the amphibolite facies (kyanite zone). These rocks are associated with the initial stage of the main ductile deformation that occurred in this area. Thermobarometric calculations, including the associations, garnet + plagioclase + biotite + muscovite; garnet + plagioclase +biotite + muscovite + kyanite; garnet + plagioclase + biotite + muscovite + amphibole, with quartz in excess, indicate that the metamorphic peak occurred at temperatures of approximately 610°C and pressures in the order of 10 kbar. The P-T path is probably clockwise and is in agreement with the tectonic conditions observed in collisional settings.