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DOI	10.1016/j.epsl.2020.116108
	No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER
	Cartier C.; Namur O.; Nittler L.R.; Weider S.Z.; Crapster-Pregont E.; Vorburger A.; Franck E.A.; Charlier B.
发表日期	2020
ISSN	0012821X
卷号	534
英文摘要	In this study we investigate the likeliness of the existence of an iron sulfide layer (FeS matte) at the core-mantle boundary (CMB) of Mercury by comparing new chemical surface data obtained by the X-ray Spectrometer onboard the MESSENGER spacecraft with geochemical models supported by high-pressure experiments under reducing conditions. We present a new data set consisting of 233 Ti/Si measurements, which combined with Al/Si data show that Mercury's surface has a slightly subchondritic Ti/Al ratio of 0.035 ± 0.008. Multiphase equilibria experiments show that at the conditions of Mercury's core formation, Ti is chalcophile but not siderophile, making Ti a useful tracer of sulfide melt formation. We parameterize and use our partitioning data in a model to calculate the relative depletion of Ti in the bulk silicate fraction of Mercury as a function of a putative FeS layer thickness. By comparing the model results and surface elemental data we show that Mercury most likely does not have a FeS layer, and in case it would have one, it would only be a few kilometers thick (<13km). We also show that Mercury's metallic Fe(Si) core cannot contain more than ∼1.5 wt.% sulfur and that the formation of this core under reducing conditions is responsible for the slightly subchondritic Ti/Al ratio of Mercury's surface. © 2020 Elsevier B.V.
关键词	core formation magma ocean reducing conditions sulfide matte titanium
英文关键词	Aluminum compounds; Silicates; Structural geology; Sulfur compounds; Titanium; X ray spectrometers; Core formation; Core-mantle boundary; High-pressure experiment; Magma ocean; MESSENGER spacecraft; Multiphase equilibria; Reducing conditions; sulfide matte; Titanium compounds; aluminum; chondrite; core-mantle boundary; experimental study; geochemistry; iron sulfide; magma; Mercury (planet); spacecraft; titanium
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202527
作者单位	Département de Géologie, Université de Liège, Sart Tilman, 4000, Belgium; Laboratoire Magmas et Volcans, Université Blaise Pascal, Clermont-Ferrand, 63038, France; CRPG, CNRS, Université de Lorraine, UMR 7358, Vandoeuvre-lès-Nancy, 54501, France; Department of Earth and Environmental Sciences, KU Leuven, Leuven, 3001, Belgium; Carnegie Institution of Washington, Department of Terrestrial Magnetism, Washington, DC 20015, United States; Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024, United States
推荐引用方式 GB/T 7714	Cartier C.,Namur O.,Nittler L.R.,et al. No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER[J],2020,534.
APA	Cartier C..,Namur O..,Nittler L.R..,Weider S.Z..,Crapster-Pregont E..,...&Charlier B..(2020).No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER.Earth and Planetary Science Letters,534.
MLA	Cartier C.,et al."No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER".Earth and Planetary Science Letters 534(2020).