Abstract
This article considers the conditions for the Au–Ag epithermal mineralization of the Arykevaam volcanic field (AVF) located in the middle of the Chukotka segment of the inner zone of the Okhotsk–Chukotka volcanic belt (OChVB). The results of thermo- and cryometric studies of fluid inclusions in quartz showed that epithermal mineralization was deposited by homogeneous hydrothermal fluids with low salt concentrations (0.3–1.5 wt % NaCl eq.), fluid densities of 0.77–0.83 g/cm3, at moderate temperatures, 267–229°C. In the fluid, among the cations, the main role is played by (g/kg H2O): K (1.8–10.2), Ca (4.7–12.9), and Na (3.7–5.8), and among the anions by SO42– (16.1–20.3), Cl (6.0–20.0), and \({\text{HCO}}_{{\text{3}}}^{ - }\) (2.4–14.7). The main indicators of the fluid composition are CO2/ CH4 = 315–2818, Na/K = 0.37–3.18, and K/Rb = 324–743. According to water extracts, the real fluid salinity of the Arykevaam deposit (4.5–6.1 wt %) is significantly higher than that found by microthermometry, since the fluid is dominated by sulfates, not sodium chloride. The results allow us to attribute the mineralization studied here to the high sulfidation epithermal class.
Similar content being viewed by others
REFERENCES
Belyi, V.F., Strukturno-formatsionnaya karta Okhotsko-Chukotskogo vulkanogennogo poyasa (Ob''yasnitelnaya zapiska) (A Structural–Formation Map of the Okhotsk–Chukchi Volcanogenic Belt. Explanatory Note),Magadan: SVKNII DVO RAN, 1981.
Belyi,V.F., Geologiya Okhotsko-Chukotskogovulkanogennogo poyasa (The Geology of the Okhotsk–Chukchi Volcanogenic Belt), Magadan: SVKNII DVO RAN, 1994.
Bodnar, R.J. and Vityk, M.O., Interpretation of microthermometric data for H2O−NaCl fluid inclusions, in Fluid Inclusions in Minerals: Methods and Applications, Pontignano: Siena, 1994, pp. 117−130.
Bodnar, R.J., Lecumberri-Sanchez, P., Moncada, D., and Steele-Maclnnes, P., Fluid inclusions in hydrothermal ore deposits, in Reference Module in Earth Systems and Environmental Sciences. Treatise on Geochemistry, 2nd Edition, Oxford: Elsevier, 2014, pp. 119–142.
Borisenko, A.S., A study of salinity composition in liquid–gas inclusions in minerals using cryometric techniques, Geol. Geofiz., 1977, no. 8, pp. 16–27.
Bortnikov, N.S., The geochemistry and origin of mineralizing fluids in hydrothermal magmatic systems in tectonically active zones, Geol. Rudn. Mestorozhd., 2006, vol. 48, no. 1, pp. 3–28.
Brown, P., FLINCOR: a computer program for the reduction and investigation of fluid inclusion data, Amer. Mineralogist, 1989, vol. 74, pp. 1390–1393.
Kryazhev, S.G., Prokof’ev, V.Yu., and Vasyuta, Yu.V., Using the ICP MS technique for the analysis of ore-forming fluids, Vestnik MGU, Seriya 4, Geologiya, 2006, no. 4, pp. 30–36.
Malysheva, G.M., Isaeva, E.P., Tikhomirov, Yu.B., et al., Gosudarstvennaya geologicheskaya karta Rossiiskoi Federatsii (A Geological State Map of the Russian Federation), Scale 1 : 1000000 (third generation), Chukchi Series, Sheet Q-59 (Markovo), Explanatory Note, St. Petersburg: Kartograficheskaya Fabrika VSEGEI, 2012.
Prokofiev, V.Yu., Volkov, A.V., Sidorov, A.A., et al., Geochemical features of the mineralizing fluid in the Kupol epithermal Au-Ag deposit, northeastern Russia, Dokl. Akad. Nauk, 2012, vol. 447, no. 4, pp. 433–436.
Prokofiev, V.Yu., Volkov, A.V., Nikolaev, Yu.N., et al., The conditions for the generation of the epithermal Au-Ag mineralization in the Kaenmyvaam ore field, central Chukotka, Rudy i Metally, 2019, no. 1, pp. 52–57.
Roedder, Edwin, Fluid Inclusions (Reviews in Mineralogy, volume 12), Washington, D.C.: Book Crafters, 1984.
Simmons, F.A., White, N.C., and John, D.A., Geological characteristics of epithermal precious and base metal deposits, in Economic Geology 100th Anniversary Volume,Society of Economic Geologists, Inc. 2005, pp. 485–522.
Vlasov, E.A., Prokoviev, V.Yu., Nikolaev, Yu.N., et al., A new finding of gold–telluride mineralization in Chukotka: The mineralogy and the conditions for the generation of the Televeem ore occurrence, Rudy i Metally, 2016, no. 4, pp. 48–50.
Volkov, A.V., Prokofiev, V.Yu., Sidorov, A.A., Vinokurov, S.F., Elmanov, A.A., Murashov, K.Yu., and Sidorova, N.V., The conditions of generation for the Au–Ag epithermal mineralization in the Amguema–Kanchalan volcanic field, eastern Chukotka, J. Volcanol. Seismol., 2019, vol. 13, no. 5, pp. 335–348.
Funding
The study was financially supported by the Russian Foundation for Basic Research, project no. 18-05-70001).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Volkov, A.V., Prokofiev, V.Y., Sidorov, A.A. et al. Conditions for the Au–Ag Epithermal Mineralization in the Arykevaam Volcanic Field, Central Chukotka. J. Volcanolog. Seismol. 14, 220–228 (2020). https://doi.org/10.1134/S0742046320040077
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0742046320040077