Wolframite from heavy-mineral assemblages at Trucbába – Valcha, Moldanubicum

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Acta Mus. Moraviae, Sci. Geol. 97 (2012), issue 2, pages 77-84

Wolframite from heavy-mineral assemblages at Trucbába – Valcha, Moldanubicum

Magnesium-rich wolframite from stream sediment in Trucbába – Valcha locality (Humpolec area) was found. It forms sporadic black grains among ilmenite, magnetite, monazite-(Ce), xenotime-(Y), scheelite, garnet, rutile, zircon, apatite, sillimanite, tourmaline, cassiterite and gold in the heavy-mineral concentrates. In the wolframite dominates ferberite (77–86 %) component over both huanzalaite (≤ 11 %) and hübnerite (6–10 %) components. Other analyzed elements are near (e. g. Bi, Ca, Nb, Sc, Ti, Zr) or bellow (Na, Pb, Sb, Sn, Ta, U, Y) detection limits. Primary wolframite-bearing occurrences in surrounding Moldanubicum contain scheelite-, cassiterite- and elsewhere gahnite mineral assemblages. Their wolframites are poor in Mg, therefore primary locality of Mg-rich ferberite studied remain unknown.



Lenka Losertová, Zbyněk Buřival, Zdeněk Losos, Institute of Geological Sciences, Masaryk University, Kotlářská 2, CZ – 611 37 Brno, Czech Republic. e-mail: lena.los@seznam.cz, zbynek@burival.com, losos@sci.muni.cz
Stanislav Houzar, Department of Mineralogy and Petrography, Moravian Museum, Zelný trh 6, 659 37 Brno, Czech Republic. *shouzar@mzm.cz

Losertová, L., Houzar, S., Buřival, Z., Losos, Z., 2012: Wolframit ve šlichových vzorcích lokality Trucbába – Valcha, moldanubikum. – Acta Mus. Morav., Sci. Geol., 97, 2, 77–84 (with English summary)
ISSN: 1211–8796