An experimental investigation of F, Cl and H2O mineral-melt partitioning in a reduced, model lunar system

It is believed that the Moon formed following collision of a large planetesimal with early Earth. Over ∼4 Gyr since this event has been considerably less processed by geological activity than Earth, and may provide better record processes conditions in Earth-Moon system. There have many studies magmatic volatiles such as H, F, Cl, S C lunar materials. However, our ability to interpret variable volatile contents sample suite dependent on understanding behaviour systems. This currently constrained limited experimental data. Here, we present first mineral-melt partitioning coefficients for Cl H2O model system under appropriately reduced (log fO2 IW-2.1, i.e. oxygen fugacity down 2.1 log units below Fe-FeO buffer). Data are consistent structural incorporation OH− silicate melt, olivine pyroxene mantle. Oxygen effect speciation, H2O, F instead largely mineral chemistry melt structure. Partition broadly mantle source region volcanic products significantly depleted relative compared terrestrial Partitioning data also used redistribution during magma ocean (LMO) crystallisation. The content cumulates upon proportion trapped liquid LMO solidification. differences solidification can result significant enrichment cumulate phases original composition. As such, depletion part be