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Fluid evolution of the Hub Stock, Horní Slavkov–Krásno Sn–W ore district, Bohemian Massif, Czech Republic

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Abstract

The Horní Slavkov–Krásno Sn–W ore district is hosted by strongly altered Variscan topaz–albite granite (Krudum granite body) on the northwestern margin of the Bohemian Massif. We studied the fluid inclusions on greisens, ore pockets, and ore veins from the Hub Stock, an apical expression of the Krudum granite. Fluid inclusions record almost continuously the post-magmatic cooling history of the granite body from ∼500 to <50°C. Rarely observed highest-temperature (∼500°C) highest-salinity (∼30 wt.% NaCl eq.) fluid inclusions are probably the result of secondary boiling of fluids exsolved from the crystallizing magma during pressure release which followed hydraulic brecciation of the gneissic mantle above the granite cupola. The greisenization was related to near-critical low-salinity (0–7 wt.% NaCl eq.) aqueous fluids with low amount of CO2, CH4, and N2 (≤10 mol% in total) at temperatures of ∼350–400°C and pressures of 300–530 bar. Crush-leach data display highly variable and negatively correlated I/Cl and Br/Cl values which are incompatible with both orthomagmatic and/or metamorphic origin of the fluid phase, but can be explained by infiltration of surficial and/or sedimentary fluids. Low fluid salinity indicates a substantial portion of meteoric waters in the fluid mixture that is in accordance with previous stable isotope data. The post-greisenization fluid activity associated with vein formation and argillitization is characterized by decreasing temperature (<350 to <50°C), decreasing pressure (down to ∼50–100 bar), and mostly also decreasing salinity.

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Acknowledgments

The fluid inclusion study of the Horní Slavkov–Krásno deposit was supported by the project GAČR 205/09/0540. The detailed comments by two journal reviewers (A. M. van den Kerkhof and R. Thomas) and editor (B. Lehmann) helped to improve the initial draft of the manuscript. Special thank is due to R. Thomas for providing unpublished Raman data.

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Authors and Affiliations

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

    Zdeněk Dolníček & Michal Kovář

  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

Authors
  1. Zdeněk Dolníček
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  2. Miloš René
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  3. Walter Prochaska
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  4. Michal Kovář
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Correspondence to Zdeněk Dolníček.

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Table 1

Results of microthermometric measurements of aqueous fluid inclusions from Hub Stock. The temperature parameters are in degrees Celsius (°C), salinity in weight percent (wt.%) NaCl eq. (PDF 28 kb)

Table 2

Results of microthermometric measurements of vapor-rich S3 fluid inclusions that display condensation of carbonic phase during cooling. The temperature parameters are in degrees Celsius (°C). (PDF 16 kb)

Table 3

Crush-leach data on fluid inclusions from Hub Stock. The analyte concentrations are in parts per billion (ppb). Molar ratios and charge balance Q+/Q− (sum of positive charges/sum of negative charges) are also visualized. (PDF 21 kb)

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Dolníček, Z., René, M., Prochaska, W. et al. Fluid evolution of the Hub Stock, Horní Slavkov–Krásno Sn–W ore district, Bohemian Massif, Czech Republic. Miner Deposita 47, 821–833 (2012). https://doi.org/10.1007/s00126-012-0400-0

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