Open AccessQuímica mineral e estimativas de pressão e temperatura em rochas metassedimentares do grupo Araxá na região de Morrinhos, sul do estado de Goiás
Author(s) -
Guillermo Rafael Beltran Navarro,
Antenor Zanardo,
Fabiano Tomazini da Conceição,
Renato Moraes,
Luiz Sérgio Amarante Simões
Publication year - 2011
Publication title -
geologia usp. série científica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 21
eISSN - 2316-9095
pISSN - 1519-874X
DOI - 10.5327/z1519-874x2011000200001
Subject(s) - muscovite , geology , plagioclase , metamorphic rock , biotite , kyanite , amphibole , metamorphic facies , mica , geochemistry , quartz , mineral , mineralogy , geomorphology , facies , materials science , paleontology , structural basin , metallurgy
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