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

Essaïd Bilal 1, 2, 3 J. Cesar -Mendes J.M Correia Neves Mohamed Nasraoui 2, 3 Kazuo Fuzikawa
1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
2 GENERIC-ENSMSE - Département Géochimie, environnement, écoulement, réacteurs industriels et cristallisation
3 LMV-ENSMSE - Laboratoire Magmas et Volcans
Mines Saint-Étienne MSE - École des Mines de Saint-Étienne, SPIN, CNRS - Centre National de la Recherche Scientifique : UMR6524, LMV - Laboratoire Magmas et Volcans : UMR 6524
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.
keyword : Fe/Mn Minas São José da Safira tourmaline pegmatites
Type de document :
Article dans une revue
Journal of the Czech Geological Society, 1998, 43 (1-2), pp.33-38
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https://hal-emse.ccsd.cnrs.fr/emse-00613218
Contributeur : Andrée-Aimée Toucas <>
Soumis le : mercredi 3 août 2011 - 15:44:41
Dernière modification le : mardi 23 octobre 2018 - 14:36:06

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  • HAL Id : emse-00613218, version 1

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EMSE | GENERIC-ENSMSE | SPIN-ENSMSE | UNIV-ST-ETIENNE | PRES_CLERMONT | LMV | INSU | OPGC

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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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