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Minerals 2017, 7(4), 50; https://doi.org/10.3390/min7040050

Uraninite, Coffinite and Brannerite from Shear-Zone Hosted Uranium Deposits of the Bohemian Massif (Central European Variscan Belt)

1
Institute of Rock Structure and Mechanics, v.v.i., Academy of Sciences of the Czech Republic, V Holešovičkách 41, Prague 8, 182 09, Czech Republic
2
Department of Geology, Palacký University, 17. listopadu 12, Olomouc 771 46, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Mostafa Fayek
Received: 31 January 2017 / Revised: 7 March 2017 / Accepted: 22 March 2017 / Published: 29 March 2017
(This article belongs to the Special Issue Geochemistry and Corrosion of Uranium-based Waste Materials)
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Abstract

New mineralogical data are presented for shear-zone hosted uranium mineralisation from selected uranium deposits that occur in the Bohemian Massif. The uranium mineralisation is in high-grade metamorphic rocks of the Moldanubian Zone and/or in granitic rocks of the Moldanubian batholith and Bor pluton as complex uraninite–coffinite and uraninite–coffinite–brannerite assemblages. For analysed coffinites and brannerites, anomalous enrichment of Y (up to 3.4 wt % Y2O3) and Zr (up to 13.8 wt % ZrO2) is significant. The microprobe data indicate that coffinites from the Rožná and Okrouhlá Radouň uranium deposits contain variable PbO (0–4.3 wt %), FeO (0–2.5 wt %), Al2O3 (0–3.5 wt %), P2O5 (0–1.8 wt %), and CaO (0.7–3.5 wt %). Brannerite is present in unaltered and altered grains with variable concentrations of U4+ (0–0.5 apfu), U6+ (0.06–0.49 apfu), Ti (0.90–2.63 apfu), Ca (0.09–0.41 apfu), and low concentrations of Al (0–0.19 apfu), Th (0–0.04 apfu), Y (0–0.08 apfu), Zr (0–0.13 apfu) and REE (0–0.14 apfu). View Full-Text
Keywords: uranium; hydrothermal mineralisation; granite; high-grade metamorphic rocks; aceite; Bohemian Massif; Rožná; Okrouhlá Radouň; Zadní Chodov; Lhota uranium; hydrothermal mineralisation; granite; high-grade metamorphic rocks; aceite; Bohemian Massif; Rožná; Okrouhlá Radouň; Zadní Chodov; Lhota
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René, M.; Dolníček, Z. Uraninite, Coffinite and Brannerite from Shear-Zone Hosted Uranium Deposits of the Bohemian Massif (Central European Variscan Belt). Minerals 2017, 7, 50.

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