An Oxygen Fugacity-Temperature-Pressure-Composition Model for Sulfide Speciation in Mercurian Magmas (data)

The NASA MESSENGER mission revealed that lavas on Mercury are enriched in sulfur (1.5-4 wt.%) compared with other terrestrial planets (<0.1 wt.%) due to high S solubility in silicate melt under its very low oxygen fugacity (ƒO2). However, the speciation of that S remains poorly constrained. In this study, we evaluate the role of pressure, temperature, and melt composition on S solubility and speciation in reduced magmas relevant to Mercury.