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Title: Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle

Abstract

Hydrous magnesium silicate phase D plays a key role in the transport of water from the upper to the lower mantle via subducted slabs. Here we report pressure dependence hyperfine and lattice parameters of FeAl-bearing phase D up to megabar pressures using synchrotron nuclear forward scattering and X-ray diffraction in a diamond anvil cell at room temperature. We report FeAl-bearing phase D undergoes a two-stage high-spin to low-spin transition of iron for Fe 2+ at 37–41 GPa and for Fe 3+ at 64–68 GPa. These transitions are accompanied by an increase in density and a significant softening in the bulk modulus and bulk velocity at their respective pressure range. The occurrence of the dense low-spin FeAl-bearing phase D with relatively high velocity anisotropies in deep-subducted slabs can potentially contribute to small-scale seismic heterogeneities in the middle-lower mantle beneath the circum-Pacific area.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. China Univ. of Geosciences, Wuhan (China); Peking Univ. (China)
  2. Peking Univ. (China)
  3. Univ. of Texas, Austin, TX (United States); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  4. Univ. of Texas, Austin, TX (United States)
  5. Univ. of Science and Technology of China, Hefei (China)
  6. China Univ. of Geosciences, Wuhan (China); Okayama Univ., Tottori (Japan)
  7. Okayama Univ., Tottori (Japan)
  8. Univ. Bayreuth (Germany)
  9. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
  10. Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab., HPCAT
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1331674
Grant/Contract Number:  
AC02-06CH11357; NA0001974; FG02-99ER45775; U1232204; 41473056
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 121; Journal Issue: 9; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; phase D; spin transition of iron; lower mantle

Citation Formats

Wu, Xiang, Wu, Ye, Lin, Jung-Fu, Liu, Jin, Mao, Zhu, Guo, Xinzhuan, Yoshino, Takashi, McCammon, Catherine, Prakapenka, Vitali B., and Xiao, Yuming. Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle. United States: N. p., 2016. Web. doi:10.1002/2016JB013209.
Wu, Xiang, Wu, Ye, Lin, Jung-Fu, Liu, Jin, Mao, Zhu, Guo, Xinzhuan, Yoshino, Takashi, McCammon, Catherine, Prakapenka, Vitali B., & Xiao, Yuming. Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle. United States. doi:10.1002/2016JB013209.
Wu, Xiang, Wu, Ye, Lin, Jung-Fu, Liu, Jin, Mao, Zhu, Guo, Xinzhuan, Yoshino, Takashi, McCammon, Catherine, Prakapenka, Vitali B., and Xiao, Yuming. Sat . "Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle". United States. doi:10.1002/2016JB013209. https://www.osti.gov/servlets/purl/1331674.
@article{osti_1331674,
title = {Two-stage spin transition of iron in FeAl-bearing phase D at lower mantle},
author = {Wu, Xiang and Wu, Ye and Lin, Jung-Fu and Liu, Jin and Mao, Zhu and Guo, Xinzhuan and Yoshino, Takashi and McCammon, Catherine and Prakapenka, Vitali B. and Xiao, Yuming},
abstractNote = {Hydrous magnesium silicate phase D plays a key role in the transport of water from the upper to the lower mantle via subducted slabs. Here we report pressure dependence hyperfine and lattice parameters of FeAl-bearing phase D up to megabar pressures using synchrotron nuclear forward scattering and X-ray diffraction in a diamond anvil cell at room temperature. We report FeAl-bearing phase D undergoes a two-stage high-spin to low-spin transition of iron for Fe2+ at 37–41 GPa and for Fe3+ at 64–68 GPa. These transitions are accompanied by an increase in density and a significant softening in the bulk modulus and bulk velocity at their respective pressure range. The occurrence of the dense low-spin FeAl-bearing phase D with relatively high velocity anisotropies in deep-subducted slabs can potentially contribute to small-scale seismic heterogeneities in the middle-lower mantle beneath the circum-Pacific area.},
doi = {10.1002/2016JB013209},
journal = {Journal of Geophysical Research. Solid Earth},
issn = {2169-9313},
number = 9,
volume = 121,
place = {United States},
year = {2016},
month = {9}
}

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Cited by: 3 works
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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