Thermodynamic simulation of the genesis of filling veins

Borisov, M.V.; Bychkov, D.A.; Shvarov, Y.V.

Авторы: Borisov M.V., Bychkov D.A., Shvarov Y.V.
Журнал: Geochemistry International
Том: 40
Год издания: 2002
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: S92
Последняя страница: S102
Аннотация: Thermodynamic models are analyzed that were proposed for the origin of base-metal filling veins during the cooling of mineralizing fluids (succession of multiwave stepped flow reactors with a step of 10degreesC from 350 to 100degreesC, 1 kbar) in the root part of a hydrothermal system at the reaction of barren solutions with the host granite containing clarke concentrations of ore-forming elements (370degreesC, 1 kbar). The thermodynamic simulation was conducted for the H-O-K-Na-Ca-Mg-Al-Si-Fe-C-CI-S-Zn-Pb-Cu system with 50 minerals of constant composition, four complex (multisite) ideal solid solutions (chlorite, epidote, actinolite, and carbonate), and 78 species of the aqueous solution. The following possible mechanisms of the filling of free space in fractures and the origin of veins are considered: layer-by-layer deposition, reaction replacement, and reaction-layer deposition (recycling of a given number of earlier layers). The first results for reaction-layer models are reported. The reaction-layer models more smoothly describe the increase in the Pb/Zn ratio updip orebodies, which is typical of several deposits, and may explain the simultaneous crystallization of significant amounts of sphalerite and galena. The regularities in the distribution of Zn, Pb, and Cu in cross sections of mineralized base-metal veins at the Sadon deposit are compared with the thermodynamic simulation results.
Добавил в систему: Шваров Юрий Всеволодович

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