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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
Zhang, Zhigang1,2; Csanyi, Gabor3; Alfe, Dario4,5,6; Zhang, Yigang1,2; Li, Juan1,2; Liu, Jin7,8
2022-02-28
Source PublicationGEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
Volume49Issue:4Pages:11
AbstractSolubility 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.
KeywordEarth's core evolution free energy first-principles iron-alloying liquids machine learning
DOI10.1029/2021GL096749
Funding OrganizationStrategic 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
WOS KeywordACCRETION ; DIFFERENTIATION ; BOUNDARY ; SILICON ; STATE ; NI
Language英语
Funding ProjectStrategic Priority Research Program (B) of Chinese Academy of Sciences[XDB18000000] ; key research program of IGGCAS[IGGCAS-201904]
Funding OrganizationStrategic 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
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000765659300045
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104963
Collection地球与行星物理院重点实验室
Corresponding AuthorZhang, Zhigang
Affiliation1.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
First Author AffilicationKey Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences
Recommended Citation
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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