Seismic anisotropy of the D'' layer induced by (001) deformation of post-perovskite
Abstract
Crystallographic preferred orientation (CPO) of post-perovskite (Mg,Fe)SiO3 (pPv) has been believed to be one potential source of the seismic anisotropic layer at the bottom of the lower mantle (D'' layer). However, the natural CPO of pPv remains ambiguous in the D'' layer. Here we have carried out the deformation experiments of pPv-(Mg0.75,Fe0.25)SiO3 using synchrotron radial X-ray diffraction in a membrane-driven laser-heated diamond anvil cell from 135 GPa and 2,500 K to 154 GPa and 3,000 K. Our results show that the intrinsic texture of pPv-(Mg0.75,Fe0.25)SiO3 should be (001) at realistic P–T conditions of the D'' layer, which can produce a shear wave splitting anisotropy of ~3.7% with VSH>VSV. Considering the combined effect of both pPv and ferropericlase, we suggest that 50% or less of deformation is sufficient to explain the origin of the shear wave anisotropy observed seismically in the D'' layer beneath the circum-Pacific rim.
- Authors:
-
[2];
- China University of Geosciences, Wuhan (China). State Key Lab. of Geological Processes and Mineral Resources
- Univ. of Texas, Austin, TX (United States). Dept. of Geological Sciences, Jackson School of Geosciences
- Univ. of Liverpool (United Kingdom). Dept. Earth, Ocean and Ecological Sciences
- Univ. of Science and Technology of China, Hefei (China). School of Earth and Space Sciences
- Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
- Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources
- Publication Date:
- Research Org.:
- Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1355034
- Grant/Contract Number:
- FG02-94ER14466; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 01, 2017; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES
Citation Formats
Wu, Xiang, Lin, Jung-Fu, Kaercher, Pamela, Mao, Zhu, Liu, Jin, Wenk, Hans-Rudolf, and Prakapenka, Vitali B. Seismic anisotropy of the D'' layer induced by (001) deformation of post-perovskite. United States: N. p., 2017.
Web. doi:10.1038/ncomms14669.
Wu, Xiang, Lin, Jung-Fu, Kaercher, Pamela, Mao, Zhu, Liu, Jin, Wenk, Hans-Rudolf, & Prakapenka, Vitali B. Seismic anisotropy of the D'' layer induced by (001) deformation of post-perovskite. United States. https://doi.org/10.1038/ncomms14669
Wu, Xiang, Lin, Jung-Fu, Kaercher, Pamela, Mao, Zhu, Liu, Jin, Wenk, Hans-Rudolf, and Prakapenka, Vitali B. Tue .
"Seismic anisotropy of the D'' layer induced by (001) deformation of post-perovskite". United States. https://doi.org/10.1038/ncomms14669. https://www.osti.gov/servlets/purl/1355034.
@article{osti_1355034,
title = {Seismic anisotropy of the D'' layer induced by (001) deformation of post-perovskite},
author = {Wu, Xiang and Lin, Jung-Fu and Kaercher, Pamela and Mao, Zhu and Liu, Jin and Wenk, Hans-Rudolf and Prakapenka, Vitali B.},
abstractNote = {Crystallographic preferred orientation (CPO) of post-perovskite (Mg,Fe)SiO3 (pPv) has been believed to be one potential source of the seismic anisotropic layer at the bottom of the lower mantle (D'' layer). However, the natural CPO of pPv remains ambiguous in the D'' layer. Here we have carried out the deformation experiments of pPv-(Mg0.75,Fe0.25)SiO3 using synchrotron radial X-ray diffraction in a membrane-driven laser-heated diamond anvil cell from 135 GPa and 2,500 K to 154 GPa and 3,000 K. Our results show that the intrinsic texture of pPv-(Mg0.75,Fe0.25)SiO3 should be (001) at realistic P–T conditions of the D'' layer, which can produce a shear wave splitting anisotropy of ~3.7% with VSH>VSV. Considering the combined effect of both pPv and ferropericlase, we suggest that 50% or less of deformation is sufficient to explain the origin of the shear wave anisotropy observed seismically in the D'' layer beneath the circum-Pacific rim.},
doi = {10.1038/ncomms14669},
journal = {Nature Communications},
number = 01, 2017,
volume = 8,
place = {United States},
year = {Tue Apr 18 00:00:00 EDT 2017},
month = {Tue Apr 18 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Elasticity and Anisotropy of the Pyrite-Type FeO2H-FeO2 System in Earth’s Lowermost Mantle
journal, July 2018
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Structural phases arising from reconstructive and isostructural transitions in high-melting-point oxides under hydrostatic pressure: A first-principles study
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