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Title: Spin transition of ferric iron in the calcium-ferrite type aluminous phase: Fe 3+ Spin Transition in the CF Phase

Abstract

We investigated Fe-free and Fe-bearing CF phases using nuclear forward scattering and X-ray diffraction coupled with diamond anvil cells up to 80 GPa at room temperature. Octahedral Fe3+ ions in the Fe-bearing CF phase undergo a high-spin to low-spin transition at 25–35 GPa, accompanied by a volume reduction of ~2.0% and a softening of bulk sound velocity up to 17.6%. Based on the results of this study and our previous studies, both the NAL and CF phases, which account for 10–30 vol % of subducted MORB in the lower mantle, are predicted to undergo a spin transition of octahedral Fe3+ at lower mantle pressures. Spin transitions in these two aluminous phases result in an increase of density of 0.24% and a pronounced softening of bulk sound velocity up to 2.3% for subducted MORB at 25–60 GPa and 300 K. The anomalous elasticity region expands and moves to 30–75 GPa at 1200 K and the maximum of the VΦ reduction decreases to ~1.8%. This anomalous elastic behavior of Fe-bearing aluminous phases across spin transition zones may be relevant in understanding the observed seismic signatures in the lower mantle.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [1]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6];  [7]; ORCiD logo [8]
  1. School of Science, Wuhan University of Technology, Wuhan China
  2. Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, and School of Earth and Space Sciences, Peking University, Beijing China
  3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan China
  4. Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth Germany
  5. Institute for Planetary Materials, Okayama University, Misasa Japan
  6. Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang China
  7. HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne Illinois USA
  8. GeoSoilEnviroCARS, University of Chicago, Chicago Illinois USA
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCESNSFDOE-NNSAFOREIGN
OSTI Identifier:
1397301
Resource Type:
Journal Article
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 122; Journal Issue: 8; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES

Citation Formats

Wu, Ye, Qin, Fei, Wu, Xiang, Huang, Haijun, McCammon, Catherine A., Yoshino, Takashi, Zhai, Shuangmeng, Xiao, Yuming, and Prakapenka, Vitali B. Spin transition of ferric iron in the calcium-ferrite type aluminous phase: Fe 3+ Spin Transition in the CF Phase. United States: N. p., 2017. Web. doi:10.1002/2017JB014095.
Wu, Ye, Qin, Fei, Wu, Xiang, Huang, Haijun, McCammon, Catherine A., Yoshino, Takashi, Zhai, Shuangmeng, Xiao, Yuming, & Prakapenka, Vitali B. Spin transition of ferric iron in the calcium-ferrite type aluminous phase: Fe 3+ Spin Transition in the CF Phase. United States. doi:10.1002/2017JB014095.
Wu, Ye, Qin, Fei, Wu, Xiang, Huang, Haijun, McCammon, Catherine A., Yoshino, Takashi, Zhai, Shuangmeng, Xiao, Yuming, and Prakapenka, Vitali B. Tue . "Spin transition of ferric iron in the calcium-ferrite type aluminous phase: Fe 3+ Spin Transition in the CF Phase". United States. doi:10.1002/2017JB014095.
@article{osti_1397301,
title = {Spin transition of ferric iron in the calcium-ferrite type aluminous phase: Fe 3+ Spin Transition in the CF Phase},
author = {Wu, Ye and Qin, Fei and Wu, Xiang and Huang, Haijun and McCammon, Catherine A. and Yoshino, Takashi and Zhai, Shuangmeng and Xiao, Yuming and Prakapenka, Vitali B.},
abstractNote = {We investigated Fe-free and Fe-bearing CF phases using nuclear forward scattering and X-ray diffraction coupled with diamond anvil cells up to 80 GPa at room temperature. Octahedral Fe3+ ions in the Fe-bearing CF phase undergo a high-spin to low-spin transition at 25–35 GPa, accompanied by a volume reduction of ~2.0% and a softening of bulk sound velocity up to 17.6%. Based on the results of this study and our previous studies, both the NAL and CF phases, which account for 10–30 vol % of subducted MORB in the lower mantle, are predicted to undergo a spin transition of octahedral Fe3+ at lower mantle pressures. Spin transitions in these two aluminous phases result in an increase of density of 0.24% and a pronounced softening of bulk sound velocity up to 2.3% for subducted MORB at 25–60 GPa and 300 K. The anomalous elasticity region expands and moves to 30–75 GPa at 1200 K and the maximum of the VΦ reduction decreases to ~1.8%. This anomalous elastic behavior of Fe-bearing aluminous phases across spin transition zones may be relevant in understanding the observed seismic signatures in the lower mantle.},
doi = {10.1002/2017JB014095},
journal = {Journal of Geophysical Research. Solid Earth},
issn = {2169-9313},
number = 8,
volume = 122,
place = {United States},
year = {2017},
month = {8}
}

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