globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116108
论文题名:
No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER
作者: Cartier C.; Namur O.; Nittler L.R.; Weider S.Z.; Crapster-Pregont E.; Vorburger A.; Franck E.A.; Charlier B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 534
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164905
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Cartier C.,Namur O.,Nittler L.R.,et al. No FeS layer in Mercury? Evidence from Ti/Al measured by MESSENGER[J]. Earth and Planetary Science Letters,2020-01-01,534
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