Native selenium in the apical rocks of the Gaisky copper-pyrite deposit
https://doi.org/10.24930/1681-9004-2023-23-6-1095-1114
Abstract
Research subject. Selenium mineralization in altered rocks of the Gaisky deposit. Aim. Determination of formation conditions of native selenium in altered rocks. Results. Selenium mineralization is established in three zones of altered rocks in the sides of the 3rd quarry and is confined to the upper part of the sulfur-quartz rocks. Layers with a high content of native selenium and tiemannite are distinguished by a carbon-black color against the general background of yellow-green sulfur-quartz rocks, forming subvertical trickle textures. The maximum propagation of selenium mineralization was found in the southwestern zone of the quarry. Here, selenium-containing rocks are traced vertically by 6 m, forming a lens with a diameter of up to 70 cm. The accumulation of selenium occurs due to its physical properties. Selenium is similar to sulfur in volatility, although it undergoes more intense condensation under decreased temperatures. The accumulation of selenium condensate is facilitated by a silicic acid gel, which prevents the removal of selenium by a hydrothermal flow. Conclusion. The native selenium of the Gaisky deposit is characterized by a hydrothermal genesis, which, along with the presence of monoclinic native sulfur in the rocks, indicates the hydrothermal formation of the entire complex of altered rocks.
Supporting agencies: The studies were carried out as part of the IGG UB RAS state assignment (state registration No. АААА-А19-119072990020-6) using the “Geoanalitik” shared research facilities of the IGG UB RAS. The requipment and comprehensive development of the “Geoanalitik” shared research facilities of the IGG UB RAS was financially supported by the grant of the Ministry of Science and Higher Education of the Russian Federation for 2021-2023 (Agreement No. 075-15-2021-680)
About the Authors
A. I. Malyshev
A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation
Russian Federation
15 Academician Vonsovsky st., Ekaterinburg 620110
L. K. Malysheva
A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation
Russian Federation
15 Academician Vonsovsky st., Ekaterinburg 620110
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Review
For citations:
Malyshev A.I., Malysheva L.K. Native selenium in the apical rocks of the Gaisky copper-pyrite deposit. LITHOSPHERE (Russia). 2023;23(6):1095-1114. (In Russ.) https://doi.org/10.24930/1681-9004-2023-23-6-1095-1114
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