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Free Energies of Fe-O-Si Ternary Liquids at High Temperatures and Pressures: Implications for the Evolution of the Earth's Core Composition

文献类型：期刊论文

作者Zhang, Zhigang1,2; Csanyi, Gabor3; Alfe, Dario4,5,6; Zhang, Yigang1,2; Li, Juan1,2; Liu, Jin7,8
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2022-02-28
卷号49期号:4页码:11
关键词Earth's core evolution free energy first-principles iron-alloying liquids machine learning
ISSN号0094-8276
DOI10.1029/2021GL096749
英文摘要Solubility of oxygen and silicon in the iron-alloying liquids is important for constraining the core composition over the Earth's history. In this study, we systematically simulated the free energies of Fe-O-Si ternary liquids from 3000 K, 55 GPa to 6000 K, and 330 GPa. We found that temperature and pressure have remarkable influences on the free energies, and the nonideality of mixing is important for the chemical potentials even at high temperatures. Equilibrating with SiO2 phase, Fe-O-Si liquids significantly enhance the solubility of Si and O simultaneously with increasing temperature. Considering the secular cooling of the Earth's core, this leads to high precipitation rates of SiO2 once it was saturated, which would efficiently drive ancient geodynamo. If the evolution of Earth's core started from an oxygen-poor composition, later incorporations of oxygen seem to be needed to reach a core composition compatible with geophysical observations.
WOS关键词ACCRETION ; DIFFERENTIATION ; BOUNDARY ; SILICON ; STATE ; NI
资助项目Strategic Priority Research Program (B) of Chinese Academy of Sciences[XDB18000000] ; key research program of IGGCAS[IGGCAS-201904]
WOS研究方向Geology
语种英语
WOS记录号WOS:000765659300045
出版者AMER GEOPHYSICAL UNION
资助机构Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS ; key research program of IGGCAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/104963]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Zhang, Zhigang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Key Lab Computat Geodynam, Beijing, Peoples R China
3.Univ Cambridge, Dept Engn, Cambridge, England
4.UCL, Dept Earth Sci, London, England
5.UCL, London Ctr Nanotechnol, London, England
6.Univ Napoli Federico II, Dipartimento Fis Ettore Pancini, Naples, Italy
7.Ctr High Pressure Sci & Technol Adv Res, Beijing, Peoples R China
8.CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Zhigang,Csanyi, Gabor,Alfe, Dario,et al. Free Energies of Fe-O-Si Ternary Liquids at High Temperatures and Pressures: Implications for the Evolution of the Earth's Core Composition[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(4):11.
APA Zhang, Zhigang,Csanyi, Gabor,Alfe, Dario,Zhang, Yigang,Li, Juan,&Liu, Jin.(2022).Free Energies of Fe-O-Si Ternary Liquids at High Temperatures and Pressures: Implications for the Evolution of the Earth's Core Composition.GEOPHYSICAL RESEARCH LETTERS,49(4),11.
MLA Zhang, Zhigang,et al."Free Energies of Fe-O-Si Ternary Liquids at High Temperatures and Pressures: Implications for the Evolution of the Earth's Core Composition".GEOPHYSICAL RESEARCH LETTERS 49.4(2022):11.

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来源：地质与地球物理研究所

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