Differences in chemistry of magmatic and hydrothermal cassiterite and wolframite from western Krušné hory Mts.

 

Karel Breiter, Radek Škoda

Geoscience Research Reports 38, 2005 (GRR for 2004), pages 94–96

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Abstract

Cassiterite and wolframite are the major host of Sn and W in fractionated granites and adjacent greisens in the western Krušné hory Mts. (Erzgebirge). In order to find differences in chemistry of cassiterite and wolframite of different genesis, we performed 44 analyses of cassiterite and 20 analyses of wolframite from granites and greisens near Podlesí. The magmatic cassiterite is much more enriched in Ta and Nb, which entered the lattice acc. to the substitution equations 3 Sn 2 (Nb,Ta) + (Fe, Mn)2+. The hydrothermal cassiterite contains only Fe, substitution in this case is problematical. Wolframite incorporates generally more Nb than Ta. Magmatic wolframite is more enriched in both Nb and Ta, the hydrothermal wolframite is more enriched in Sc.