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The Effect of Water on Fe‐Mg Interdiffusion Rates in Ringwoodite and Implications for the Electrical Conductivity in the Mantle Transition Zone
Baohua Zhang;  Takashi Yoshino;  Chengcheng Zhao
2019
Source PublicationJournal of Geophysical Research: Solid Earth
Pages2510-2524
Abstract

We determined the kinetics of Fe‐Mg interdiffusion in ringwoodite aggregates as a function of water content (up to ~6,000 wt. ppm H2O) at 20 GPa and 1,373–1,673 K by the diffusion couple method. The dependence of Fe‐Mg interdiffusivity (DFe‐Mg) on Fe concentration was determined using the Boltzmann‐Matano method. The experimentally reported DFe‐Mg in ringwoodite within 0 ≤ XFe ≤ 0.1 could be fitted by the relation urn:x-wiley:21699313:media:jgrb53291:jgrb53291-math-0001, where E* = (1 − XFe)EMg + XFeEFe (EMg = 140 ± 5 kJ/mol, EFe = 4 ± 2 kJ/mol), D0 = urn:x-wiley:21699313:media:jgrb53291:jgrb53291-math-0002 × 10−10 m2/s, n = −0.21 ± 0.10, r = 0.25 ± 0.03, and α = −24 ± 4. The water content exponent r of 0.25 suggests a nonnegligible role of water in enhancing Fe‐Mg interdiffusion in ringwoodite. The length scale over which the chemical heterogeneities are homogenized by Fe‐Mg interdiffusion in the mantle transition zone is estimated to be only a few hundred meters even assuming the whole Earth age. Comparison between the conductivities predicted from Fe‐Mg interdiffusion and those obtained from magnetotelluric surveys suggests that around 0.1 wt.% water can account for the high conductivity anomalies (~10−0.6–10−1 S/m) observed in the lower part of the mantle transition zone.

Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10594
Collection地球内部物质高温高压实验室
Affiliation1.Key Laboratory for High Temperature and High Pressure Study of the Earth's Interior, Institute of Geochemistry,Chinese Academy of Sciences, Guiyang, China
2.Institute for Planetary Materials, Okayama University, Tottori, Japan
Recommended Citation
GB/T 7714
Baohua Zhang;Takashi Yoshino;Chengcheng Zhao. The Effect of Water on Fe‐Mg Interdiffusion Rates in Ringwoodite and Implications for the Electrical Conductivity in the Mantle Transition Zone[J]. Journal of Geophysical Research: Solid Earth,2019:2510-2524.
APA Baohua Zhang;Takashi Yoshino;Chengcheng Zhao.(2019).The Effect of Water on Fe‐Mg Interdiffusion Rates in Ringwoodite and Implications for the Electrical Conductivity in the Mantle Transition Zone.Journal of Geophysical Research: Solid Earth,2510-2524.
MLA Baohua Zhang;Takashi Yoshino;Chengcheng Zhao."The Effect of Water on Fe‐Mg Interdiffusion Rates in Ringwoodite and Implications for the Electrical Conductivity in the Mantle Transition Zone".Journal of Geophysical Research: Solid Earth (2019):2510-2524.
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