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1 Comissão Nacional de Energia Nuclear, C.D.T.N. CP 941 CEP 30123-970, Belo Horizonte, Minas Gerais, Brazil
2 Instituto de Geociências, Universidade de Brasília, CP 3173 CEP 30140-970, Brasília, Distrito Federal, Brazil
3 Department of Subatomic and Radiation Physics, Ghent University, Belgium
4 Departamento de Geologia, Universidade Federal de Ouro Preto, CEP 35400-000 Ouro Preto, Minas Gerais, Brazil
5 Companhia Vale do Rio Doce, CVRD, BR 262-Km 296, P.O. Box 09 CEP 33010-970, Santa Luzia, Minas Gerais, Brazil
Correspondence: * E-mail: kiki{at}gold.com.br
Infrared (IR) spectra in the OH stretching region and Mössbauer spectra (MS) have been acquired for natural tourmalines from magmatic and hydrothermal deposits in the state of Minas Gerais, Brazil. In the magmatic environment, samples of tourmaline were collected from granitic pegmatites and granitoids. In the former, the elbaite-schorl series is prevalent, while in the latter the schorl species is dominant. Tourmalines from hydrothermal gold deposits are typically intermediate members of the dravite-schorl series, whereas the uvite and Fe-bearing uvite species are present in tourmaline samples from a magnesite deposit. Different behaviors are discussed in terms of local lattice environment, geological history, fluid/rock interaction or magma evolution, and degree of crystallinity.
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