Petrography and metamorphism of the metasedimentary country-rocks of the Jacurici Valley Chromitite-Hosting mafic-ultramafic complexes, Bahia, Northeastern Brazil

Authors

  • Eliane A. Del Lama Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Maria A. F. Candia Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Gergely A. J. Szabó Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica

DOI:

https://doi.org/10.5327/S1519-874X2001000100002

Keywords:

Jacurici Valley, metasediments, metamorphism, metasomatism

Abstract

This paper deal with on the metasedimentary country-rocks of the chromite-bearing ultramafic rocks that occur in the"Jacurici River Valley Chromium District" northeastern Bahia, Brazil. This region presents a complex geologic-petrologic framework of rocks that were intensely deformed, metamorphosed and transformed by metasomatic processes, making it difficult to interpret their evolutionary/metamorphic record. Although the metasedimentary country rocks have also been affected by such processes, it is possible to distinguish evidence of a previous high-grade metamorphism that affected them. Thermobarometric data for the observed mineralogical associations indicate P-T conditions around 750-800ºC and 7-8 kb for the metamorphic peak, based mainly on the presence of olivine in marbles and the cordierite-garnet-sillimanite-spinel association in aluminous gneisses.

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Published

2001-11-01

Issue

Vol. 1 (2001)

Section

Articles

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How to Cite

Del Lama, E. A., Candia, M. A. F., & Szabó, G. A. J. (2001). Petrography and metamorphism of the metasedimentary country-rocks of the Jacurici Valley Chromitite-Hosting mafic-ultramafic complexes, Bahia, Northeastern Brazil. Geologia USP. Série Científica, 1, 1-15. https://doi.org/10.5327/S1519-874X2001000100002