Journal of

GEOsciences

  (Formerly Journal of the Czech Geological Society)

Original Paper

E Bilal, J César-Mendes, JM Correia-Neves, M Nasraoui, Kazuo-Fuzikawa

Chemistry of tourmalines in some pegmatites of São José da Safira area, Minas Gerais, Brazil

Journal of the Czech Geological Society, volume 43 (1998), issue 1-2, 31 - 36


  Abstract

The tourmaline group minerals (schorl to elbaite) typically occur in the Li-bearing pegmatites from the São José da Safira region (the Oriental Pegmatitic Province (OPP) in Minas Gerais State, Brazil). The Fe/Mn ratios of the tourmalines are compared to those measured in columbite-tantalite and garnet and decrease northward continuously from the beryl-bearing pegmatites to the spodumene-bearing ones. The Fe/Mn ratio has been used as a qualitative index of fractionation which seems to reflect the regional zoning of the pegmatites around a hidden granite body. The Fe/Mn ratio values correlate negatively with the Na and Li contents. The REE, Nb, Co and Zn contents are controlled by the mineral assemblages.

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Policy: Open Access

ISSN: 1802-6222

E-ISSN: 1803-1943