Tracing sulfur isotopes during iron sulfide melt formation in Lunar basalts

 The Moon is a cornerstone for understanding the early history (origin, budget and timing) of volatile elements (H, C, F, S, Cl) delivered to all terrestrial planets. The volatile study of lunar magmatism is the most direct way to reconstruct the volatile budget of the Moon’s interior.  However, this reconstruction is compromised by magmatic processes that modify the initial compositions of the lunar magmas. The final goal of our work is to determine how sulfide saturation and segregation in all the compositional range of lunar lavas have affected the sulfur isotopic composition of the magmas. The determined sulfur isotopic fractionation between lunar silicate melts and immiscible sulfide blebs will allow us to directly unravel the sulfur isotopic composition of the heterogeneous reservoirs forming the Moon’s interior, and therefore, provide fundamental information on the early evolution of sulfur isotopes of the Earth’s satellite.