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Title: High-Pressure $γ$-CaMgSi 2O 6: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?

Abstract

We report in situ X-ray diffraction experiments with natural Fe- and Al- bearing diopside single crystals and density functional theory (DFT) calculations on diopside end-member composition indicate the existence of a new high-pressure γ-diopside polymorph with rare penta-coordinated silicon. On compression $α$-diopside transforms to the $γ$-phase at ~50 GPa, which in turn, on decompression is observed to convert to the known $β$-phase below 47 GPa. The new $γ$-diopside polymorph constitutes another recent example of penta-coordinated silicon ( VSi) in overcompressed metastable crystalline silicates, suggesting that VSi may exist in the transition zone and the uppermost lower mantle in appreciable quantities, not only in silicate glass and melts but also in crystalline phases contained in the coldest parts of subducted stagnant slabs. VSi may have significant influences on buoyancy, wave velocity anomalies, deformation mechanisms, chemical reactivity of silicate rocks, and seismicity within the slab.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  2. New Mexico State Univ., Las Cruces, NM (United States)
  3. Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1423341
Grant/Contract Number:  
[1344942; 1440005; 1541516; EAR-1128799; FG02-94ER14466; EAR-1661511; AC02-06CH11357; DMR TG-110093]
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
[ Journal Volume: 44; Journal Issue: 22]; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; pyroxene; diopside; high pressure; subducted slab; hypervalent silicon; phase transformation

Citation Formats

Hu, Yi, Kiefer, Boris, Bina, Craig R., Zhang, Dongzhou, and Dera, Przemeslaw K. High-Pressure $γ$-CaMgSi2O6: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?. United States: N. p., 2017. Web. doi:10.1002/2017GL075424.
Hu, Yi, Kiefer, Boris, Bina, Craig R., Zhang, Dongzhou, & Dera, Przemeslaw K. High-Pressure $γ$-CaMgSi2O6: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?. United States. doi:10.1002/2017GL075424.
Hu, Yi, Kiefer, Boris, Bina, Craig R., Zhang, Dongzhou, and Dera, Przemeslaw K. Thu . "High-Pressure $γ$-CaMgSi2O6: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?". United States. doi:10.1002/2017GL075424. https://www.osti.gov/servlets/purl/1423341.
@article{osti_1423341,
title = {High-Pressure $γ$-CaMgSi2O6: Does Penta-Coordinated Silicon Exist in the Earth's Mantle?},
author = {Hu, Yi and Kiefer, Boris and Bina, Craig R. and Zhang, Dongzhou and Dera, Przemeslaw K.},
abstractNote = {We report in situ X-ray diffraction experiments with natural Fe- and Al- bearing diopside single crystals and density functional theory (DFT) calculations on diopside end-member composition indicate the existence of a new high-pressure γ-diopside polymorph with rare penta-coordinated silicon. On compression $α$-diopside transforms to the $γ$-phase at ~50 GPa, which in turn, on decompression is observed to convert to the known $β$-phase below 47 GPa. The new $γ$-diopside polymorph constitutes another recent example of penta-coordinated silicon (VSi) in overcompressed metastable crystalline silicates, suggesting that VSi may exist in the transition zone and the uppermost lower mantle in appreciable quantities, not only in silicate glass and melts but also in crystalline phases contained in the coldest parts of subducted stagnant slabs. VSi may have significant influences on buoyancy, wave velocity anomalies, deformation mechanisms, chemical reactivity of silicate rocks, and seismicity within the slab.},
doi = {10.1002/2017GL075424},
journal = {Geophysical Research Letters},
number = [22],
volume = [44],
place = {United States},
year = {2017},
month = {10}
}

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Cited by: 9 works
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    High pressure phase transitions of paracelsian BaAl2Si2O8
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