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DOI | 10.1029/2019GL082722 |
Ab Initio Molecular Dynamics Investigation of Molten Fe-Si-O in Earth's Core | |
Huang, Dongyang1; Badro, James1,2; Brodholt, John3; Li, Yunguo3 | |
2019-06-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:12页码:6397-6405 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Switzerland; England |
英文摘要 | Silicon and oxygen are potential light elements in Earth's core because their stronger affinity to metal observed with increasing temperature posits that significant amounts of both can be incorporated into the core. It was proposed that an Fe-Si-O liquid alloy could expel SiO2 at the core-mantle boundary during secular cooling, leaving the core with either silicon or oxygen, not both. This was recently challenged in a study showing no exsolution but immiscibility in the Fe-Si-O system. Here we investigate the liquidus field of Fe-Si and Fe-O binaries and Fe-Si-O ternaries at core-mantle boundary pressures and temperatures using ab initio molecular dynamics. We find that the liquids remain well mixed with ternary properties identical to mixing of binary properties. Two-phase simulations of solid SiO2 and liquid Fe show dissolution at temperatures above 4100 K, suggesting that SiO2 crystallization as well as liquid immiscibility in Fe-Si-O is unlikely to occur in Earth's core. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000477616300028 |
WOS关键词 | 1ST PRINCIPLES CALCULATIONS ; LIQUID-IRON ; OXYGEN ; SILICON ; NI ; CR ; DIFFUSION ; EVOLUTION ; ELEMENTS ; MANTLE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184227 |
专题 | 气候变化 |
作者单位 | 1.Sorbonne Paris Cite, Inst Phys Globe Paris, F-75005 Paris, France; 2.Ecole Polytech Fed Lausanne, Lausanne, Switzerland; 3.UCL, Dept Earth Sci, London, England |
推荐引用方式 GB/T 7714 | Huang, Dongyang,Badro, James,Brodholt, John,et al. Ab Initio Molecular Dynamics Investigation of Molten Fe-Si-O in Earth's Core[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(12):6397-6405. |
APA | Huang, Dongyang,Badro, James,Brodholt, John,&Li, Yunguo.(2019).Ab Initio Molecular Dynamics Investigation of Molten Fe-Si-O in Earth's Core.GEOPHYSICAL RESEARCH LETTERS,46(12),6397-6405. |
MLA | Huang, Dongyang,et al."Ab Initio Molecular Dynamics Investigation of Molten Fe-Si-O in Earth's Core".GEOPHYSICAL RESEARCH LETTERS 46.12(2019):6397-6405. |
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