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The Solubility of CaF2 in Seawater of Normal and Increased Salinity (Associated with Genesis of Fluorite in Sedimentary Rocks)

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Abstract

The solubility of crystalline and precipitated calcium fluoride in seawater and brines of the first stages of its evaporative concentration (before the beginning of gypsum and halite setting) has been experimentally studied. It is established that in the entire studied range of salinity, seawater and its derivatives are strongly undersaturated in calcium fluoride, which excludes its spontaneous precipitation in drying isolated sea basins. A necessary condition for the formation of sedimentary fluorite is the entry of significant amounts of dissolved fluorine from external sources, which can be river runoff, volcanic emanations, and hydrothermal solutions, into drying sea basins.

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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Department of Geology, Moscow State University, 119991, Moscow, Russia

    A. V. Savenko

  2. Department of Geography, Moscow State University, 119991, Moscow, Russia

    V. S. Savenko

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  1. A. V. Savenko
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  2. V. S. Savenko
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Translated by L. Mukhortova

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Savenko, A.V., Savenko, V.S. The Solubility of CaF2 in Seawater of Normal and Increased Salinity (Associated with Genesis of Fluorite in Sedimentary Rocks). Moscow Univ. Geol. Bull. 78, 731–736 (2023). https://doi.org/10.3103/S0145875223060145

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