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The Scale of Extraction of Ore Elements Zn and Pb by Aqueous Chloride Fluids in the Process of Degassing of Granite Magmas During Their Rise to the Surface and Crystallization

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Advances in Geochemistry, Analytical Chemistry, and Planetary Sciences

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Abstract

The results of computer modeling of distribution of ore elements Zn and Pb between the melt and fluid phase formed during degassing of H2O-and Cl-bearing granitic magmas caused by pressure decrease and crystallization in the pressure range from 0.3–0.5 to 3.5–4 kbar are presented. The model was developed based on generalization of available experimental data on H2O solubility in melts and fluid/melt distribution of Cl, Zn and Pb. It allows calculating the concentrations of ore elements in fluid, melt and crystalline phases during decompression and crystallization degassing of magmas both in closed conditions, when the fluid phase remains in the system, and in open conditions, when the resulting fluid phase is removed from the system completely or partially. The main factors influencing on concentrations of Zn and Pb in fluid and the degree of their extraction from the melt in the process of degassing of granite magmas are considered: (1) the pressure at which fluid saturation of the melts is achieved during their ascent; (2) the initial chlorine content in the melt; (3) the degree of crystallization of the fluid-saturated melt, (4) the openness of the magmatic system in relation to the fluid phase, (5) the change in the value of the bulk partition coefficient of Zn and Pb between crystals and melt, depending on the ratio of crystallizing mineral phases. It is shown that the initial concentrations of volatile components (Cl, H2O) in the melts, as well as the dynamics of fluid removal from magmas during degassing, largely determine the scale of extraction of ore elements from granitic magmas during their rise to the surface and crystallization. Quantitative estimates are made of the maximum possible removal of Zn and Pb by aqueous-chloride fluids formed during degassing of granite magmas at different depths, depending on the initial volatile content under closed and open conditions.

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Acknowledgements

The author is sincerely grateful to Prof. B.N. Ryzhenko and Dr. T.I. Shchekina for a discussion of the problems considered in the article. This work is conducted under the GEOKHI RAS state assignment.

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  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin St., Moscow, 119991, Russia

    O. A. Lukanin

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Correspondence to O. A. Lukanin .

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  1. Vernadsky Institute of Russian Academy of Sciences, Moscow, Russia

    Vladimir P. Kolotov

  2. Vernadsky Institute of Russian Academy of Sciences, Moscow, Russia

    Natalia S. Bezaeva

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Lukanin, O.A. (2023). The Scale of Extraction of Ore Elements Zn and Pb by Aqueous Chloride Fluids in the Process of Degassing of Granite Magmas During Their Rise to the Surface and Crystallization. In: Kolotov, V.P., Bezaeva, N.S. (eds) Advances in Geochemistry, Analytical Chemistry, and Planetary Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-09883-3_7

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