Abstract
The conditions for precipitation of magnesium fluoride (sellaite) from seawater with salinity of 35–105‰ were experimentally determined. It was established that precipitation of MgF2 at salinity of 35, 70, and 105‰ occurs at the concentration of dissolved fluorine above 37, 46, and 51 mg/l, respectively. In isolated evaporitic basins, the fluorine concentration required for the formation of sellaite is not achieved at all stages of the evaporation of seawater. It is assumed that high concentration of fluorine sufficient for the precipitation of sellaite arise as a result of the combined effect of evaporation and additional inflow of this element into evaporitic basins with river runoff or/and the release of coprecipitated and adsorbed fluorine during of postsedimentary recrystallization of salt minerals.
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