Exsolution intergrowths of titanian ferrocolumbite and niobian rutile from the Weinebene Spodumene Pegmatites,Carinthia, Austria |
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| Authors: | Dr P ?erný Dr R Chapman R Göd Dr G Niedermayr Dr M A Wise |
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| Institution: | (1) Department of Geological Sciences, University of Manitoba, R3T 2N2 Winnipeg, Canada;(2) Alleeweg 8, A-2352 Gumpoldskirchen, Austria;(3) Mineralogisch-Petrographische Abteilung, Naturhistorisches Museum, A-1010 Wien, Austria;(4) Present address: Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA |
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| Abstract: | Summary Titanian ferrocolumbite is a rare accessory mineral in the spodumene-bearing pegmatites at Weinebene, Carinthia, Austria. It contains abundant exsolved niobian rutile and scarce inclusions of cassiterite that may be primary. The titanian ferrocolumbite is relatively homogeneous with Mn/(Mn + Fe) 0.24–0.33, Ta/(Ta + Nb) 0.09–0.13 (atomic ratios) and 0.47–0.88 Ti per 12 cations (2.7–5.0 wt.% TiO2). Natural specimens are considerably disordered but become more ordered on heating. Niobian rutile has Mn/(Mn + Fe) 0.00–0.04 and Ta/(Ta + Nb) 0.26–0.38; it concentrates Fe, Ta, Ti and Sn relative to the Mn- and Nb-enriched ferrocolumbite. The overall scarcity of Nb, Ta-oxide minerals in the spodumene-bearing pegmatites of southern Ostalpen conforms to their general features ranking them with the albite-spodumene type of rare-element pegmatites.With 4 Figures |
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| Keywords: | Tantalum Niobium Titanium Columbite Rutile Mineralogy Geochemistry Pegmatite Austria Ostalpen |
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