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Tetrahedrite from the Dubrave-Dugi Dol Barite Deposits, Kreševo, Bosnia and Herzegovina

The chemical composition of the tetrahedrite from the barite deposit Dubrave – Dugi Dol, south of the town Kreševo, Bosnia, hosted by Devonian Dolomite is as follows: (Cu10.65Ag0.073Hg0.03)10.75(Fe0.81Zn0.94)1.75(Sb3.57As0.34Bi0.004)3.91S13.00. Cation proportions are: Me2+:Me3+:S=3.20:1.00:3.33. The d34S=–10.91%0. The calculated formula is in good correspondence with the compositions of other analyzed tterahedrites from the whole Middle Bosnian Schist Mountains. These results as those of the fluid inclusion studies of gangue minerals suggests the generation of tetrahedrites from highly homogenized, hot (190–310 °C), high saline (24.2–26.3 wt% NaCl equiv.) mineralizing solutionsgenerated by mixing of ascending deep seated upper mantle (Hg, F, Cu-bearing) and metamorphogenic lower crust (Zn, Fe, Ag, Au-bearing) fluids with descending highly evolved Upper Permian saline formation waters. The obtained data exclude the applicability og the fractional crystallization generation model.

mercurian-antimonian tetrahedrite; chemical and isotopic compositions; Dubrave barite deposit; Kreševo; Bosnia

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