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DOI | 10.1029/2019GL083633 |
Fate of Hydrous Fe-Rich Silicate Melt in Earth's Deep Mantle | |
Du, Zhixue1,2; Deng, Jie3; Miyazaki, Yoshinori3; Mao, Ho-kwang2,4; Karki, Bijaya B.5,6,7; Lee, Kanani K. M.3 | |
2019-08-28 | |
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:16页码:9466-9473 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Density of silicate melt dictates melt migration and establishes the gross structure of Earth's interior. However, due to technical challenges, the melt density of relevant compositions is poorly known at deep mantle conditions. Particularly, water may be dissolved in such melts in large amounts and can potentially affect their density at extreme pressure and temperature conditions. Here we perform first-principles molecular dynamics simulations to evaluate the density of Fe-rich, eutectic-like silicate melt (E melt) with varying water content up to about 12 wt %. Our results show that water mixes nearly ideally with the nonvolatile component in silicate melt and can decrease the melt density significantly. They also suggest that hydrous melts can be gravitationally stable in the lowermost mantle given its likely high iron content, providing a mechanism to explain seismically slow and dense layers near the core-mantle boundary. Plain Language Summary Planetary-scale melting is ubiquitous after energetic impacts early in Earths history. Therefore, determining key melt properties, such as density, is of great significance to better understand Earths formation and subsequent evolution. In this study, we performed state-of-art first-principles molecular dynamics simulations to examine the density of deep mantle melts, namely, hydrous Fe-rich silicate melts. We find that such hydrous melts can be gravitationally stable near Earth's core-mantle boundary given their likely high iron content. This has great implications for Earths thermochemical evolution, as well as Earth's volatile cycle. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490966700019 |
WOS关键词 | MAGMA OCEAN ; CHEMICAL EVOLUTION ; LOWERMOST MANTLE ; SEISMIC EVIDENCE ; WATER ; DENSITY ; CRYSTALLIZATION ; SYSTEM ; DIFFERENTIATION ; CONSEQUENCES |
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/186229 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China; 2.Carnegie Inst Sci, Geophys Lab, Washington, DC 20005 USA; 3.Yale Univ, Dept Geol & Geophys, New Haven, CT USA; 4.Ctr High Pressure Sci & Technol Adv Res, Shanghai, Peoples R China; 5.Louisiana State Univ & A&M Coll, Dept Geol & Geophys, Baton Rouge, LA USA; 6.Louisiana State Univ & A&M Coll, Sch Elect Engn & Comp Sci, Baton Rouge, LA USA; 7.Louisiana State Univ & A&M Coll, Ctr Computat & Technol, Baton Rouge, LA USA |
推荐引用方式 GB/T 7714 | Du, Zhixue,Deng, Jie,Miyazaki, Yoshinori,et al. Fate of Hydrous Fe-Rich Silicate Melt in Earth's Deep Mantle[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(16):9466-9473. |
APA | Du, Zhixue,Deng, Jie,Miyazaki, Yoshinori,Mao, Ho-kwang,Karki, Bijaya B.,&Lee, Kanani K. M..(2019).Fate of Hydrous Fe-Rich Silicate Melt in Earth's Deep Mantle.GEOPHYSICAL RESEARCH LETTERS,46(16),9466-9473. |
MLA | Du, Zhixue,et al."Fate of Hydrous Fe-Rich Silicate Melt in Earth's Deep Mantle".GEOPHYSICAL RESEARCH LETTERS 46.16(2019):9466-9473. |
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