气候变化领域集成服务门户(CCPortal): Thermodynamical Modeling of Liquid Fe-Si-Mg-O:Molten Magnesium Silicate Release From the Core

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DOI	10.1029/2020GL089218
	Thermodynamical Modeling of Liquid Fe-Si-Mg-O:Molten Magnesium Silicate Release From the Core
	Helffrich G.; Hirose K.; Nomura R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:21
英文摘要	We developed a thermodynamic model to explore the joint solubility of Mg, Si, and O in liquid Fe on the basis of high-pressure metal-silicate partitioning data in the literature, with more Mg kept in the metal when Si and O are present. With <1.7 ± 0.5 wt% Mg, the metal in the young Earth's core retains Mg as the core evolves and crystallizes SiO2. Higher Mg concentrations require either the late addition of metal that equilibrated with silicate in a super-liquidus magma ocean or the assimilation of silicate into the core at the time of a giant impact. Above 1.7 wt% Mg, (Mg,Fe)-silicate melts also exsolve from the core and transfer core-hosted elements to the mantle. Fractional crystallization of the core-derived silicate melts in the core or at the core-mantle boundary could, additionally, yield a persistent molten silicate layer that could also contribute to ultralow velocity zone formation in the lowermost mantle. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Iron compounds; Metals; Silica; Silicates; Silicon; Structural geology; Core-mantle boundary; Fractional crystallization; Metal-silicate partitioning; Mg concentrations; Molten magnesium; Thermodynamic model; Thermodynamical model; Ultralow velocity zone; Magnesium compounds; concentration (composition); core analysis; crystallization; iron; magma; magnesium; oxygen; 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/169518
作者单位	Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan; Department of Earth and Planetary Science, University of Tokyo, Tokyo, Japan; Now at Hakubi Center/Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan
推荐引用方式 GB/T 7714	Helffrich G.,Hirose K.,Nomura R.. Thermodynamical Modeling of Liquid Fe-Si-Mg-O:Molten Magnesium Silicate Release From the Core[J],2020,47(21).
APA	Helffrich G.,Hirose K.,&Nomura R..(2020).Thermodynamical Modeling of Liquid Fe-Si-Mg-O:Molten Magnesium Silicate Release From the Core.Geophysical Research Letters,47(21).
MLA	Helffrich G.,et al."Thermodynamical Modeling of Liquid Fe-Si-Mg-O:Molten Magnesium Silicate Release From the Core".Geophysical Research Letters 47.21(2020).