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Spin transition of ferric iron in the calcium-ferrite type aluminous phase
Ye Wu;  Fei Qin;  Xiang Wu;  Haijun Huang;  Catherine A. McCammon;  Takashi Yoshino;  Shuangmeng Zhai;  Yuming Xiao;  Vitali B. Prakapenka
2017
Source PublicationJournal of Geophysical Research Solid Earth
Volume122Issue:8Pages:5935-5944
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.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8043
Collection地球内部物质高温高压实验室
Affiliation1.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
Recommended Citation
GB/T 7714
Ye Wu;Fei Qin;Xiang Wu;Haijun Huang;Catherine A. McCammon;Takashi Yoshino;Shuangmeng Zhai;Yuming Xiao;Vitali B. Prakapenka. Spin transition of ferric iron in the calcium-ferrite type aluminous phase[J]. Journal of Geophysical Research Solid Earth,2017,122(8):5935-5944.
APA Ye Wu;Fei Qin;Xiang Wu;Haijun Huang;Catherine A. McCammon;Takashi Yoshino;Shuangmeng Zhai;Yuming Xiao;Vitali B. Prakapenka.(2017).Spin transition of ferric iron in the calcium-ferrite type aluminous phase.Journal of Geophysical Research Solid Earth,122(8),5935-5944.
MLA Ye Wu;Fei Qin;Xiang Wu;Haijun Huang;Catherine A. McCammon;Takashi Yoshino;Shuangmeng Zhai;Yuming Xiao;Vitali B. Prakapenka."Spin transition of ferric iron in the calcium-ferrite type aluminous phase".Journal of Geophysical Research Solid Earth 122.8(2017):5935-5944.
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