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Strong Sequestration of Hydrogen Into the Earth's Core During Planetary Differentiation
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2020-07-08 , DOI: 10.1029/2020gl088303 Liang Yuan 1 , Gerd Steinle‐Neumann 1
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2020-07-08 , DOI: 10.1029/2020gl088303 Liang Yuan 1 , Gerd Steinle‐Neumann 1
Affiliation
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.
中文翻译:
行星分化过程中将氢牢固地螯合到地球核心
在密度泛函理论分子动力学的帮助下,我们探索了在岩浆海洋和当前岩心—地幔边界条件下,氢在共存金属和硅酸盐熔体之间的分配行为。我们使用两阶段积分法和热力学积分法进行模拟。我们发现,氢在低压(20 GPa和2,500 K)下弱亲铁性,并且在压力下变得更强,表明氢在岩心偏析过程中大量转运到岩心,并且在那里稳定。根据我们的结果,假设单级形成并在40 GPa时达到平衡,则岩心可能含有约1 wt%的H。我们的两相模拟进一步表明,硅夹带在形成芯的金属中,而镁保留在硅酸盐相中。
更新日期:2020-08-03
中文翻译:
行星分化过程中将氢牢固地螯合到地球核心
在密度泛函理论分子动力学的帮助下,我们探索了在岩浆海洋和当前岩心—地幔边界条件下,氢在共存金属和硅酸盐熔体之间的分配行为。我们使用两阶段积分法和热力学积分法进行模拟。我们发现,氢在低压(20 GPa和2,500 K)下弱亲铁性,并且在压力下变得更强,表明氢在岩心偏析过程中大量转运到岩心,并且在那里稳定。根据我们的结果,假设单级形成并在40 GPa时达到平衡,则岩心可能含有约1 wt%的H。我们的两相模拟进一步表明,硅夹带在形成芯的金属中,而镁保留在硅酸盐相中。