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DOI | 10.1073/pnas.1716748115 |
Pressure-induced structural change in MgSiO3 glass at pressures near the Earth's core-mantle boundary | |
Kono, Yoshio1; Shibazaki, Yuki2; Kenney-Benson, Curtis1; Wang, Yanbin3; Shen, Guoyin1 | |
2018-02-20 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:8页码:1742-1747 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Japan |
英文摘要 | Knowledge of the structure and properties of silicate magma under extreme pressure plays an important role in understanding the nature and evolution of Earth's deep interior. Here we report the structure of MgSiO3 glass, considered an analog of silicate melts, up to 111 GPa. The first (r1) and second (r2) neighbor distances in the pair distribution function change rapidly, with r1 increasing and r2 decreasing with pressure. At 53-62 GPa, the observed r1 and r2 distances are similar to the Si-O and Si-Si distances, respectively, of crystalline MgSiO3 akimotoite with edge-sharing SiO6 structural motifs. Above 62 GPa, r1 decreases, and r2 remains constant, with increasing pressure until 88 GPa. Above this pressure, r1 remains more or less constant, and r2 begins decreasing again. These observations suggest an ultrahigh-pressure structural change around 88 GPa. The structure above 88 GPa is interpreted as having the closest edge-shared SiO6 structural motifs similar to those of the crystalline postperovskite, with densely packed oxygen atoms. The pressure of the structural change is broadly consistent with or slightly lower than that of the bridgmanite-to-postperovskite transition in crystalline MgSiO3. These results suggest that a structural change may occur in MgSiO3 melt under pressure conditions corresponding to the deep lower mantle. |
英文关键词 | high pressure silicate glass core-mantle boundary polyamorphism |
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:000425495000046 |
WOS关键词 | POST-PEROVSKITE PHASE ; MOLECULAR-DYNAMICS ; SILICATE MELT ; DEEP MANTLE ; MAGMA OCEAN ; SIO2 GLASS ; DIFFRACTION ; ELASTICITY ; DENSITY ; LAYER |
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/205048 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Carnegie Inst Sci, Geophys Lab, High Pressure Collaborat Access Team, Argonne, IL 60439 USA; 2.Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Aoba Ku, Sendai, Miyagi 9808578, Japan; 3.Univ Chicago, Ctr Adv Radiat Sources, GeoSoilEnviroCARS, Chicago, IL 60637 USA |
推荐引用方式 GB/T 7714 | Kono, Yoshio,Shibazaki, Yuki,Kenney-Benson, Curtis,et al. Pressure-induced structural change in MgSiO3 glass at pressures near the Earth's core-mantle boundary[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(8):1742-1747. |
APA | Kono, Yoshio,Shibazaki, Yuki,Kenney-Benson, Curtis,Wang, Yanbin,&Shen, Guoyin.(2018).Pressure-induced structural change in MgSiO3 glass at pressures near the Earth's core-mantle boundary.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(8),1742-1747. |
MLA | Kono, Yoshio,et al."Pressure-induced structural change in MgSiO3 glass at pressures near the Earth's core-mantle boundary".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.8(2018):1742-1747. |
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