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Secondary mineral-forming processes in natural—anthropogenic hydrogeological systems at sulfide deposits. Simulation of the origin of the phase (Fe,Mg)SO4 · 7H2O in the course of sulfide oxidation at the Degtyarka copper sulfide deposit

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Abstract

Data on the decommissioned Degtyarka Cu sulfide deposit, Urals, confirm the hypothesis that the flooding of abandoned mine workings is associated with the synthesis of secondary sulfates. Numerical simulation of hydrogeochemical processes in the rock—water system imitating the flooding of an underground void makes it possible to evaluate the conditions under which kirovite (Fe,Mg)SO4 · 7H2O and melanterite are formed at the oxidation of ore sulfides. Secondary sulfates are formed when the redox potential of the system is transformed from reducing to oxidizing within the stability field of Fe(II) species. The Fe/Mg ratio of the kirovite (Fe,Mg)SO4 · 7H2O is controlled first of all by the percentage of sulfides in the rock—water system, the rock/water ratio, the openness of the system with respect to atmospheric gases, and the temperature.

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Authors and Affiliations

  1. Ural Hydrogeological Expedition, ul. Osnovinskaya 7, Yekaterinburg, 620041, Russia

    S. N. Elokhina

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

    B. N. Ryzhenko

Authors
  1. S. N. Elokhina
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  2. B. N. Ryzhenko
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Correspondence to S. N. Elokhina.

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Original Russian Text © S.N. Elokhina, B.N. Ryzhenko, 2014, published in Geokhimiya, 2014, Vol. 52, No. 2, pp. 178–192.

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Elokhina, S.N., Ryzhenko, B.N. Secondary mineral-forming processes in natural—anthropogenic hydrogeological systems at sulfide deposits. Simulation of the origin of the phase (Fe,Mg)SO4 · 7H2O in the course of sulfide oxidation at the Degtyarka copper sulfide deposit. Geochem. Int. 52, 162–177 (2014). https://doi.org/10.1134/S0016702914020050

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  • DOI: https://doi.org/10.1134/S0016702914020050

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