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DOI | 10.1073/pnas.1821712116 |
Evidence for Fe-Si-O liquid immiscibility at deep Earth pressures | |
Arveson, Sarah M.1; Deng, Jie1; Karki, Bijaya B.2; Lee, Kanani K. M.1 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:21页码:10238-10243 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Seismic observations suggest that the uppermost region of Earth's liquid outer core is buoyant, with slower velocities than the bulk outer core. One possible mechanism for the formation of a stably stratified layer is immiscibility in molten iron alloy systems, which has yet to be demonstrated at core pressures. We find immiscibility between liquid Fe-Si and Fe-Si-O persisting to at least 140 GPa through a combination of laser-heated diamond-anvil cell experiments and first-principles molecular dynamics simulations. High-pressure immiscibility in the Fe-Si-O system may explain a stratified layer atop the outer core, complicate differentiation and evolution of the deep Earth, and affect the structure and intensity of Earth's magnetic field. Our results support silicon and oxygen as coexisting light elements in the core and suggest that SiO2 does not crystallize out of molten Fe-Si-O at the core-mantle boundary. |
英文关键词 | high pressure melting alloys core composition |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000468403400015 |
WOS关键词 | OUTERMOST CORE ; TEMPERATURE ; STRATIFICATION ; VELOCITY ; SYSTEM ; LAYER ; CONSTRAINTS |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/205116 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Yale Univ, Dept Geol & Geophys, POB 6666, New Haven, CT 06511 USA; 2.Louisiana State Univ, Dept Geol & Geophys, Ctr Computat & Technol, Sch Elect Engn & Comp Sci, Baton Rouge, LA 70803 USA |
推荐引用方式 GB/T 7714 | Arveson, Sarah M.,Deng, Jie,Karki, Bijaya B.,et al. Evidence for Fe-Si-O liquid immiscibility at deep Earth pressures[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(21):10238-10243. |
APA | Arveson, Sarah M.,Deng, Jie,Karki, Bijaya B.,&Lee, Kanani K. M..(2019).Evidence for Fe-Si-O liquid immiscibility at deep Earth pressures.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(21),10238-10243. |
MLA | Arveson, Sarah M.,et al."Evidence for Fe-Si-O liquid immiscibility at deep Earth pressures".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.21(2019):10238-10243. |
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