Experimental analysis reveals that high temperature significantly impacts sulfur solubility in carbonate melts, suggesting potential for diamond growth.
Experimental studies aimed at the estimation of the solubility of sulfur in Mg,Ca-carbonate melts under lithospheric mantle conditions (MgCO−S, CaMg(CO)−S, CaCO−S and (Mg,Ca)CO−S systems, Ca# (CaO/(CaO+MgO) (molar)) = 0, 0.2, 0.5, 0.8 and 1.0; pressure 6.3 GPa, 1450–1550°C, 20 hours). It was experimentally demonstrated that melts of alkaline earth carbonates are capable of dissolving from 1.9 to 6.5 wt.% S, while for the first time it was established that the solubility of sulfur directly depends on both temperature and the CaO/MgO ratio in the melt. In particular, it has been demonstrated that the solubility of sulfur in a melt of Ca-carbonate is 6–7 times higher than in a melt of Mg-carbonate. The obtained results indicate that sulfur-enriched melts of alkaline earth carbonates can be considered as potential metasomatic agents, not only capable of transporting sulfur and carbon, but also being potential media for graphite crystallization and diamond growth.
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O.V. Furman (2025) studied this question.
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