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Origin of the Okrouhlá Radouň episyenite-hosted uranium deposit, Bohemian Massif, Czech Republic: fluid inclusion and stable isotope constraints

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Abstract

The Okrouhlá Radouň shear zone hosted uranium deposit is developed along the contact of Variscan granites and high-grade metasedimentary rocks of the Moldanubian Zone of the Bohemian Massif. The pre-ore pervasive alteration of wall rocks is characterized by chloritization of mafic minerals, followed by albitization of feldspars and dissolution of quartz giving rise to episyenites. The subsequent fluid circulation led to precipitation of disseminated uraninite and coffinite, and later on, post-ore quartz and carbonate mineralization containing base metal sulfides. The fluid inclusion and stable isotope data suggest low homogenization temperatures (∼50–140 °C during pre-ore albitization and post-ore carbonatization, up to 230 °C during pre-ore chloritization), variable fluid salinities (0–25 wt.% NaCl eq.), low fluid δ18O values (−10 to +2 ‰ V-SMOW), low fluid δ13C values (−9 to −15 ‰ V-PDB), and highly variable ionic composition of the aqueous fluids (especially Na/Ca, Br/Cl, I/Cl, SO4/Cl, NO3/Cl ratios). The available data suggest participation of three fluid endmembers of primarily surficial origin during alteration and mineralization at the deposit: (1) local meteoric water, (2) Na–Ca–Cl basinal brines or shield brines, (3) SO4–NO3–Cl–(H)CO3 playa-like fluids. Pre-ore albitization was caused by circulation of alkaline, oxidized, and Na-rich playa fluids, whereas basinal/shield brines and meteoric water were more important during the post-ore stage of alteration.

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Acknowledgments

P. Gadas and R. Škoda (MU Brno) are thanked for assistance during microprobe work. The stable isotope analyses conducted by I. Jačková, Z. Lněničková (ČGS Praha), B. Putlitz, and T. Vennemann (UNIL Lausanne) are highly appreciated. S. H. thanks R. Bakker (MU Leoben) for introducing into Raman analysis of fluid inclusions. P. Sulovský (UP Olomouc) is thanked for providing of some archive samples. Financial support by projects IGA UP PrF_2011_010 (to Z. D. and S. H.) and ME10083 (to M. R.) is highly appreciated. The detailed comments by three journal reviewers (K. Ansdell, Ph. Boulvais, and an anonymous one) and editors A. Gilg and B. Lehmann helped to improve the initial version of the manuscript.

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  1. Department of Geology, Palacký University, 17. listopadu 12, Olomouc, 771 46, Czech Republic

    Zdeněk Dolníček & Sylvie Hermannová

  2. Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holešovičkách 94/41, 182 09, Prague, Czech Republic

    Miloš René

  3. Department of Geology and Economic Geology, Montanuniversität Leoben, Peter-Tunner-Strasse 5, 8700, Leoben, Austria

    Walter Prochaska

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Dolníček, Z., René, M., Hermannová, S. et al. Origin of the Okrouhlá Radouň episyenite-hosted uranium deposit, Bohemian Massif, Czech Republic: fluid inclusion and stable isotope constraints. Miner Deposita 49, 409–425 (2014). https://doi.org/10.1007/s00126-013-0500-5

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