The Role of Hydrocarbons in the Formation of Epithermal Gold–Silver Deposits in Kamchatka, Russia

Data on the mineralogical and geochemical features of three epithermal gold deposits in Kamchatka, as well as on the compositions and physicochemical parameters of ore-forming fluids, based on scanning electron microscopy, microthermometry, Raman spectroscopy, and gas chromatography–mass spectrometr...

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Bibliographic Details
Published in:Doklady earth sciences 2022-12, Vol.507 (2), p.994-1000
Main Authors: Tolstykh, N. D., Bortnikov, N. S., Shapovalova, M. O., Shaparenko, E. O.
Format: Article
Language:English
Subjects:
Analytical methods
Carbon dioxide
Chromatography
Composition
Deposits
Earth and Environmental Science
Earth Sciences
Electron microscopy
Fluid inclusions
Fluids
Gas chromatography
Geology of Ore Deposits
Gold
Gold industry
Hydrocarbons
Mass spectrometry
Mass spectroscopy
Organic compounds
Oxidation
Physicochemical processes
Physicochemical properties
Raman spectroscopy
Salinity
Scanning electron microscopy
Selenides
Selenium
Silver
Spectroscopy
Sulfidation
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Summary:Data on the mineralogical and geochemical features of three epithermal gold deposits in Kamchatka, as well as on the compositions and physicochemical parameters of ore-forming fluids, based on scanning electron microscopy, microthermometry, Raman spectroscopy, and gas chromatography–mass spectrometry, are reported. All deposits are comparable in terms of temperature, salinity, and the predominance of CO 2 in ore-forming fluids. The high-sulfidation Maletoivayam deposit differs from the other two low-sulfidation ones (Baran’yevskoe and Rodnikovoe) in the substantial enrichment in Se and much higher concentrations of organic compounds (OCs) (20 rel. %) in fluid inclusions. It has been concluded that OСs played an important role in the concentration and transportation of Au and Se, while the oxidation environment contributed to the formation of numerous selenides, including AuSe. The hydrocarbon composition in inclusions records both biogenic and abiogenic origins, while the relative content of OCs in solutions controls the degree of sulfidation of the deposit.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X22600852