GSTDTAP  > 地球科学
DOI10.1073/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
ISSN0027-8424
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
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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
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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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