Physicochemical Conditions of Quartz Formation at the Bazov Gold-Ore Deposit (East Yakutia, Russia)
- Authors: Fridovsky V.Y.1, Kryazhev S.G.2, Goryachev N.A.3
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Affiliations:
- Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences
- Central Research Institute of Geological Prospecting for Base and Precious Metals
- Northeast Integrated Scientific Research Institute, Far East Branch, Russian Academy of Sciences
- Issue: Vol 13, No 5 (2019)
- Pages: 407-416
- Section: Article
- URL: https://journals.rcsi.science/1819-7140/article/view/211682
- DOI: https://doi.org/10.1134/S1819714019050038
- ID: 211682
Cite item
Abstract
The evolution of the hydrothermal system forming the Bazov gold-ore deposit is traced by the data on the composition and properties of the fluid inclusions within the veined quartz. The gold-bearing quartz veins were formed under a moderate decrease of temperature from 290 to 230°C and considerable decrease of pressure from 0.75 to 0.25 kbar. The pressure drop was accompanied by the volume crystallization of quartz from SiO2-saturated hydrothermal springs with the appearance of a residual fluid phase. In addition, the fluid composition was transformed from hydrocarbonate into hydrocarbonate–methane with the increase in the concentrations of chlorides of alkali and alkaline-earth metals (from 1 to 8 wt % of NaCl-equiv) along with the ore-forming elements (As, Sb, Fe, Zn, etc.). The pressure under which the formation of the gold–quartz veins occurred (about 0.25 kbar) limited the formation depth of the deposit to the range from 1 to 2.5 km (for the lithostatic and hydrostatic gradient, respectively).
About the authors
V. Y. Fridovsky
Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences
Author for correspondence.
Email: fridovsky@diamond.ysn.ru
Russian Federation, Yakutsk
S. G. Kryazhev
Central Research Institute of Geological Prospecting for Base and Precious Metals
Email: fridovsky@diamond.ysn.ru
Russian Federation, Moscow
N. A. Goryachev
Northeast Integrated Scientific Research Institute, Far East Branch, Russian Academy of Sciences
Email: fridovsky@diamond.ysn.ru
Russian Federation, Magadan