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The Behavior of Lithium in the Liquidus Area of a High-Fluorine Granite System at Pressures from 100 to 500 MPa

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Abstract

The lithium partitioning between aluminosilicate and alkaline aluminofluoride brine melts in a granite system with the limiting contents of water and fluorine has been studied experimentally at temperatures of 700–800°C and pressures of 100–500 MPa. It is shown that lithium is distributed into the brine melt under all conditions. An increase in the water content in the system by more than 20 wt % and a pressure from 100 to 500 MPa results in decrease in the lithium partition coefficients between brine and aluminosilicate melts by a factor of 2–4.

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ACKNOWLEDGMENTS

The authors are grateful to the staff of the Laboratory of High Spatial Resolution Analytical Techniques, N.N. Korotaeva, E.V. Guseva, and V.O. Yapaskurt for the development of the methodology and assistance in the analysis. Lithium was analyzed using the ICP-MS2000 setup at the Laboratory of Experimental Geochemistry, Department of Geochemistry, Faculty of Geology, Moscow State University, and at the Analytical Certification Testing Center of the Institute of Microelectronics Technology and High-Purity Materials, Russian Academy of Sciences, for which we are grateful to the staff of these departments.

Funding

Analytical data were obtained at the Laboratory of High Spatial Resolution Analytical Techniques, Department of Petrology and Volcanology, Geological Faculty, Moscow State University, using a Jeol JSM-6480LV scanning electron microscope (Japan) with an Oxford X-MaxN energy-dispersive spectrometer and a JEOL JXA-8230 electron probe microanalyzer, purchased by the Moscow University Development Program. The laboratory research was supported by the Russian Foundation for Basic Research, project no. 16-05-00859.

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Correspondence to T. I. Shchekina, A. A. Rusak, Ya. O. Alferyeva, E. N. Gramenitskiy, V. A. Khvostikov, A. R. Kotelnikov, A. Yu. Bychkov or N. G. Zinovieva.

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Translated by A. Bobrov

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Shchekina, T.I., Rusak, A.A., Alferyeva, Y.O. et al. The Behavior of Lithium in the Liquidus Area of a High-Fluorine Granite System at Pressures from 100 to 500 MPa. Moscow Univ. Geol. Bull. 76, 423–435 (2021). https://doi.org/10.3103/S0145875221040098

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  • DOI: https://doi.org/10.3103/S0145875221040098

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