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DOI	10.1016/j.epsl.2021.116849
	High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary
	Tao R.; Fei Y.
发表日期	2021
ISSN	0012821X
卷号	562
英文摘要	The partitioning of light elements between liquid and solid at the inner core boundary (ICB) governs compositional difference and density deficit between the outer and inner core. Observations of high S and low Fe concentration on the surface of Mercury from MESSENGER mission indicate that Mercury is formed under much more reduced conditions than other terrestrial planets, which may result in a Si and S-bearing metallic Fe core. In this study, we conducted high-pressure experiments to investigate the partitioning behavior of Si and S between liquid and solid in the Fe-Si-S system at 15 and 21 GPa, relevant to Mercury's ICB conditions. Experimental results show that almost all S partitions into liquid. The partitioning coefficient of Si (DSi) between liquid and solid is strongly correlated with the S content in liquid (XSliquid) as: log10⁡(DSi)=0.0445+5.9895⁎log10⁡(1−XSliquid). Within our experimental range, pressure has limited effect on the partitioning behavior of Si and S between liquid and solid. For Mercury with an Fe-Si-S core, compositional difference between the inner and outer core is strongly dependent on the S content of the core. The lower S content is in the core, the smaller compositional difference and density deficit between the liquid outer core and solid inner core should be observed. For a core with 1.5 wt% bulk S, a model ICB temperature would intersect with the melting curve at ∼17 GPa, corresponding to an inner core with a radius of ∼1600 km. © 2021 Elsevier B.V.
关键词	Fe-Si-S high-pressure Mercury's core partitioning phase diagram
英文关键词	Iron; Iron compounds; Liquids; Compositional difference; High-pressure experiment; Inner core boundary; Light elements; Melting curves; Outer and inner cores; Partitioning coefficients; Terrestrial planets; Silicon; experimental study; high pressure; inner core; iron; Mercury (planet); partition coefficient; silicon; sulfur
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/203304
作者单位	Earth and Planets Laboratory, Carnegie Institution for Science, 5251 Broad Branch Road, NW, Washington, DC 20015, United States
推荐引用方式 GB/T 7714	Tao R.,Fei Y.. High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary[J],2021,562.
APA	Tao R.,&Fei Y..(2021).High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary.Earth and Planetary Science Letters,562.
MLA	Tao R.,et al."High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary".Earth and Planetary Science Letters 562(2021).