No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER
作者： C. Cartier , O. Namur , L.R. Nittler , S.Z. Weider , E. Crapster-Pregont
DOI: 10.1016/J.EPSL.2020.116108
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摘要: Abstract In this study we investigate the likeliness of existence an iron sulfide layer (FeS matte) at core-mantle boundary (CMB) Mercury by comparing new chemical surface data obtained X-ray Spectrometer onboard MESSENGER spacecraft with geochemical models supported high-pressure experiments under reducing conditions. We present a set consisting 233 Ti/Si measurements, which combined Al/Si show that Mercury's has slightly subchondritic Ti/Al ratio 0.035 ± 0.008. Multiphase equilibria conditions core formation, Ti is chalcophile but not siderophile, making useful tracer melt formation. parameterize and use our partitioning in model to calculate relative depletion bulk silicate fraction as function putative FeS thickness. By results elemental most likely does have layer, case it would one, only be few kilometers thick ( 13 km ). also metallic Fe(Si) cannot contain more than ∼1.5 wt.% sulfur formation responsible for surface.
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