Chemistry of tourmalines in some pegmatites of São José da Safira area, Minas Gerais, Brazil - Mines Saint-Étienne Access content directly
Journal Articles Journal of the Czech Geological Society Year : 1998

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

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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Dates and versions

emse-00613218 , version 1 (03-08-2011)

Identifiers

  • HAL Id : emse-00613218 , version 1

Cite

Essaïd Bilal, J. Cesar -Mendes, J.M Correia Neves, Mohamed Nasraoui, Kazuo Fuzikawa. Chemistry of tourmalines in some pegmatites of São José da Safira area, Minas Gerais, Brazil. Journal of the Czech Geological Society, 1998, 43 (1-2), pp.33-38. ⟨emse-00613218⟩
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