气候变化领域集成服务门户(CCPortal): Strong Sequestration of Hydrogen Into the Earth's Core During Planetary Differentiation

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DOI	10.1029/2020GL088303
	Strong Sequestration of Hydrogen Into the Earth's Core During Planetary Differentiation
	Yuan L.; Steinle-Neumann G.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	We explore the partitioning behavior of hydrogen between coexisting metal and silicate melts at conditions of the magma ocean and the current core–mantle boundary with the help of density functional theory molecular dynamics. We perform simulations with the two-phase and thermodynamic integration methods. We find that hydrogen is weakly siderophile at low pressure (20 GPa and 2,500 K), and becomes much more strongly so with pressure, suggesting that hydrogen is transported to the core in a significant amount during core segregation and is stable there. Based on our results, the core likely contains ~1 wt% H, assuming single-stage formation and equilibration at 40 GPa. Our two-phase simulations further suggest that silicon is entrained in the core-forming metal, while magnesium remains in the silicate phase. This preferred incorporation of silicon hints at an explanation for the elevated Mg/Si ratio of the bulk silicate Earth relative to chondritic compositions. © 2020. The Authors.
英文关键词	Magnesium compounds; Molecular dynamics; Silicates; Bulk silicate earth; Forming metals; Low pressures; Planetary differentiation; Silicate melts; Silicate phase; Thermodynamic integration methods; Two-phase simulation; Density functional theory; Earth rotation; hydrogen; low pressure; magma; magnesium; molecular analysis; silicate; silicon; thermodynamics
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169974
作者单位	Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany
推荐引用方式 GB/T 7714	Yuan L.,Steinle-Neumann G.. Strong Sequestration of Hydrogen Into the Earth's Core During Planetary Differentiation[J],2020,47(15).
APA	Yuan L.,&Steinle-Neumann G..(2020).Strong Sequestration of Hydrogen Into the Earth's Core During Planetary Differentiation.Geophysical Research Letters,47(15).
MLA	Yuan L.,et al."Strong Sequestration of Hydrogen Into the Earth's Core During Planetary Differentiation".Geophysical Research Letters 47.15(2020).