DOI: 10.1016/j.epsl.2021.116849
论文题名: High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary
作者: Tao R. ; Fei Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 562 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165682
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Earth and Planets Laboratory, Carnegie Institution for Science, 5251 Broad Branch Road, NW, Washington, DC 20015, United States
Recommended Citation:
Tao R.,Fei Y.. High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary[J]. Earth and Planetary Science Letters,2021-01-01,562