Geochemistry and EPR of cassiterites from the Iberian Hercynian Massif

Universidad de Extremadura, Area de Cristalografia y Mineralogia, Badajoz, Spain
IRNA-CSIC, Salamanca, Spain
Universite de Nancy I, Vanboeuvre les Nancy, France
Universidad de Salamanca, Salamanca, Spain
CREGU, Vandoeuvre les Nancy, France

This paper is based on microprobe analysis (Ta, Nb, Fe, Mn, Ti, W, Sn) and Fe (super 3+) 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 Fe (super 3+) EPR spectra reveal that the coupled substitution: 3Sn (super 4+) = (Fe,Mn) (super 2+) +2(Nb,Ta) (super 5+) is dominant in cassiterites from pegmatites, and high-temperature quartz veins and in the dark zones of cassiterites. The mechanisms: 2Sn (super 4+) = Fe (super 3+) + (Nb,Ta) (super 5+) and Sn (super 4+) +O (super 2-) = Fe (super 3+) +OH (super -) are dominant in those from medium-low temperature quartz veins and in the light zones of cassiterites.

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