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Geochemistry and EPR of cassiterites from the Iberian Hercynian Massif

Published online by Cambridge University Press:  05 July 2018

A. Murciego ,
A. Garcla Sanchez ,
Y. Dusausoy ,
J. M. Martin Pozas  and
R. Ruck
A. Murciego
Affiliation:
Area de Cristalografía y Mineralogía, Universidad de Extremadura, Badajoz, Spain
A. Garcla Sanchez
Affiliation:
IRNA-CSIC, Aptdo. 257, Salamanca, Spain
Y. Dusausoy
Affiliation:
Laboratoire de Mineralogie et Cristallographie, Université de Nancy I, Vandoeuvre-lès-Nancy, France
J. M. Martin Pozas
Affiliation:
Departamento de Geología, Universidad de Salamanca, Spain
R. Ruck
Affiliation:
CREGU, B.P. 23, 54501, Vandoeuvre-lès-Nancy, France
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Abstract

This paper is based on microprobe analysis (Ta, Nb, Fe, Mn, Ti, W, Sn) and Fe3+ EPR spectra of cassiterite samples from 14 tin deposits from the Iberian Hercynian Massif. The interpretation of microprobe data, atomic ratios (Fe+Mn)/(Nb+Ta), and Fe3+ EPR spectra reveal that the coupled substitution: 3Sn4+ = (Fe,Mn)2+ + 2(Nb,Ta)5+ is dominant in cassiterites from pegmatites, and high-temperature quartz veins and in the dark zones of cassiterites.

The mechanisms:

2Sn4+ = Fe3+ + (Nb,Ta)5+ and

Sn4+ + O2− = Fe3+ + OH−

are dominant in those from medium-low temperature quartz veins and in the light zones of cassiterites.

Keywords

cassiteritetrace elementsFe3+ EPR spectracoupled substitutions
Type
Mineralogy
Information
Mineralogical Magazine , Volume 61 , Issue 406 , June 1997 , pp. 357 - 365
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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