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Title: Pressure-induced structural change in MgSiO3 glass at pressures near the Earth’s core–mantle boundary

Abstract

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 MgSiO 3 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 MgSiO 3 akimotoite with edge-sharing SiO 6 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 SiO 6 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 MgSiO 3 . These results suggest that a structural change may occur in MgSiO 3more » melt under pressure conditions corresponding to the deep lower mantle.« less

Authors:
ORCiD logo; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Japan Society for the Promotion of Science KAKENHI
OSTI Identifier:
1419614
Alternate Identifier(s):
OSTI ID: 1424760
Grant/Contract Number:  
AC02-06CH11357; FG02-99ER45775; NA0001974; 15K17784; EAR-1620548; EAR-1722495
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 115 Journal Issue: 8; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; high pressure; silicate glass; core–mantle; boundary; polyamorphism

Citation Formats

Kono, Yoshio, Shibazaki, Yuki, Kenney-Benson, Curtis, Wang, Yanbin, and Shen, Guoyin. Pressure-induced structural change in MgSiO3 glass at pressures near the Earth’s core–mantle boundary. United States: N. p., 2018. Web. doi:10.1073/pnas.1716748115.
Kono, Yoshio, Shibazaki, Yuki, Kenney-Benson, Curtis, Wang, Yanbin, & Shen, Guoyin. Pressure-induced structural change in MgSiO3 glass at pressures near the Earth’s core–mantle boundary. United States. doi:10.1073/pnas.1716748115.
Kono, Yoshio, Shibazaki, Yuki, Kenney-Benson, Curtis, Wang, Yanbin, and Shen, Guoyin. Mon . "Pressure-induced structural change in MgSiO3 glass at pressures near the Earth’s core–mantle boundary". United States. doi:10.1073/pnas.1716748115.
@article{osti_1419614,
title = {Pressure-induced structural change in MgSiO3 glass at pressures near the Earth’s core–mantle boundary},
author = {Kono, Yoshio and Shibazaki, Yuki and Kenney-Benson, Curtis and Wang, Yanbin and Shen, Guoyin},
abstractNote = {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 MgSiO 3 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 MgSiO 3 akimotoite with edge-sharing SiO 6 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 SiO 6 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 MgSiO 3 . These results suggest that a structural change may occur in MgSiO 3 melt under pressure conditions corresponding to the deep lower mantle.},
doi = {10.1073/pnas.1716748115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 8,
volume = 115,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1073/pnas.1716748115

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