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Thermodynamic model of the formation of ore bodies at the Akchatau wolframite greisen-vein deposit

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Abstract

The Akchatau wolframite deposit in central Kazakhstan is a typical greisen deposit. Extensive geological and geochemical data, including those on numerous geochemical signatures (isotopic composition of O, H, C, noble gases, data on fluid inclusions, REE, and others) allowed us to decipher the physicochemical conditions and main factors that caused metasomatism and ore formation. Physicochemical modeling by the HCh program package (designed by Yu.B. Shvarov) was applied to reconstruct the composition of the greisenizing solution, cooling, boiling, interaction with granites; condensation of the gas phase; and fluid mixing. The predominant species of W transfer, (NaHWO 04 aq ), and precipitation factors were determined. In small ore bodies, precipitation was caused by a temperature decrease. The precipitation of wolframite in near-vein greisens is related to the interaction of boiling highly mineralized solutions with host granites. Boiling does not affect wolframite precipitation but increases the content and ore potential of the greisenizing fluids, facilitating the formation of high-grade wolframite ores. In the filling veins of these bodies, ore precipitation is related to the dilution of solutions by weakly mineralized exogenic waters and the condensate of the gas phase. Tungsten mineralization of the Akchatau deposit was formed in an oxidizing environment, which is controlled by granite minerals during mobilization of ore components.

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Authors and Affiliations

  1. Geological Faculty, Moscow State University, Leninskie gory, Moscow, 119899, Russia

    A. Yu. Bychkov & S. S. Matveeva

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  1. A. Yu. Bychkov
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  2. S. S. Matveeva
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Correspondence to A. Yu. Bychkov.

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Original Russian Text © A.Yu. Bychkov, S.S. Matveeva, 2008, published in Geokhimiya, 2008, No. 9, pp. 934–954.

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Bychkov, A.Y., Matveeva, S.S. Thermodynamic model of the formation of ore bodies at the Akchatau wolframite greisen-vein deposit. Geochem. Int. 46, 867–886 (2008). https://doi.org/10.1134/S0016702908090024

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