PHYSICOCHEMICAL MODELS FOR ORE FORMATION PROCESSES AT MERCURY DEPOSITS
A.A. Obolensky, L.V. Gushchina, and A.S. Borisenko
Institute of Geology and Mineralogy, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Mercury deposits, ore-forming systems, composition of hydrothermal solutions, forms of mercury transfer, metal-bearing capacity of solutions, thermodynamic modeling
Pages: 1318-1334
Abstract
We report results of computer modeling of physicochemical ore formation processes at mercury deposits accumulated during the development of secondary-hydrothermal and mixed-fluid ore-forming systems. Exogenous chloride brines, oil waters of artesian basins, and petroleum pools are shown to serve as secondary mercury reservoirs and geochemical barriers.
Modeling of possible mechanisms of mercury transfer and deposition in the form of cinnabar (α - HgS) was performed for ore-forming solutions of different compositions. Four main thermodynamic models have been constructed using the Chiller program: (1) simple cooling (cooling only), for recent thermal springs, (2) mixing of high-chloride hydrothermal solutions with cold hydrosulfuric waters (mixing model), for telethermal deposits, (3) isoenthalpic boiling (P = f (T)), and (4) solution-rock interaction (rock titration model).
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