Geochemistry and EPR of cassiterites from the Iberian Hercynian Massif
1997 ◽
Vol 61
(406)
◽
pp. 357-365
◽
Keyword(s):
AbstractThis 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+andSn4++ O2−= Fe3++ OH−are dominant in those from medium-low temperature quartz veins and in the light zones of cassiterites.
2007 ◽
Vol 2007
(suppl_26)
◽
pp. 333-338
Keyword(s):
2006 ◽
Vol 527-529
◽
pp. 999-1002
Keyword(s):