Mineral chemistry and pressure and temperature estimates of metasedimentary rocks of the Araxá group in the region of Morrinhos, south of Goiás state

Authors

  • Guillermo Rafael Beltran Navarro Universidade Estadual Paulista J. M. Filho; Instituto de Geociências e Ciências Exatas
  • Antenor Zanardo Universidade Estadual Paulista J. M. Filho; Instituto de Geociências e Ciências Exatas; Departamento de Petrologia e Metalogenia
  • Fabiano Tomazini da Conceição Universidade Estadual Paulista J. M. Filho; Instituto de Geociências e Ciências Exatas; Departamento de Planejamento Territorial e Geoprocessamento
  • Renato de Moraes Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Luiz Sergio Amarante Simões Universidade Estadual Paulista J. M. Filho; Instituto de Geociências e Ciências Exatas; Departamento de Petrologia e Metalogenia

DOI:

https://doi.org/10.5327/Z1519-874X2011000200001

Keywords:

Araxá Group, Thermobarometry, Goiás

Abstract

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.

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Published

2011-08-01

Issue

Vol. 11 No. 2 (2011)

Section

Articles

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How to Cite

Navarro, G. R. B., Zanardo, A., Conceição, F. T. da, Moraes, R. de, & Simões, L. S. A. (2011). Mineral chemistry and pressure and temperature estimates of metasedimentary rocks of the Araxá group in the region of Morrinhos, south of Goiás state . Geologia USP. Série Científica, 11(2), 03-20. https://doi.org/10.5327/Z1519-874X2011000200001