Experimental study of chlorine and fluorine partitioning between fluid and subalkaline basaltic melt

Abstract

The study of solubility of volatile components in natural magmatic melts of different compositions and their partitioning between the fluid and the melt are of significant interest for modeling the magma degassing of volcanoes, understanding the transportation and deposition of ore components, and constructing models of ore deposit formation. We have studied experimentally for the first time the simultaneous distribution of chlorine and fluorine between Cl- and F-bearing aqueous fluids and the basaltic melt. We have established the anomalous behavior of volatile components in the studied system, resulting in the enhanced concentration of Cl and F in the silicate melt and aqueous fluid, respectively. According to experimental data [1‐5], the solubility (highest content) of Cl in the basaltic melt is higher than in other magmatic melts and can reach 1.8‐5.9 wt %. The fluid/melt partition coefficient of Cl (