globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.12.020
Scopus记录号: 2-s2.0-85040585456
论文题名:
Mg lattice diffusion in iron-free olivine and implications to conductivity anomaly in the oceanic asthenosphere
作者: Fei H.; Koizumi S.; Sakamoto N.; Hashiguchi M.; Yurimoto H.; Marquardt K.; Miyajima N.; Katsura T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484
起始页码: 204
结束页码: 212
语种: 英语
英文关键词: ionic conductivity ; Mg lattice diffusion ; olivine ; upper mantle
Scopus关键词: Activation energy ; Chemical activation ; Crystal lattices ; Depth profiling ; Ionic conductivity ; Olivine ; Silicate minerals ; Spectrometers ; Water content ; Conductivity anomalies ; Einstein relations ; Function of pressure ; Increasing temperatures ; Lattice diffusion ; Multi-anvil apparatus ; Secondary ion mass spectrometers ; Upper mantle ; Diffusion ; asthenosphere ; conductivity ; diffusion ; experimental mineralogy ; FTIR spectroscopy ; iron ; lattice dynamics ; magnesium ; olivine ; upper mantle ; water content
英文摘要: Mg lattice diffusion coefficients in iron-free olivine aggregates were measured as a function of pressure from 1 to 13 GPa, temperature from 1100 to 1300 K, and bulk water content from less than 1 up to 350 wt. ppm using multi-anvil apparatus and secondary ion mass spectrometer in depth profiling mode. The water contents in the samples were analyzed by Fourier transmission infrared spectrometer. The results show that Mg lattice diffusion coefficient increase with increasing temperature and water content, and decrease with pressure. The activation energy, water content exponent, and activation volume are 250 ± 30 kJ/mol, 1.2 ± 0.2, and 4.3 ± 0.3 cm3/mol, respectively. Since Mg lattice diffusion controls the ionic conduction in olivine based on the Nernst–Einstein relation, the ionic conductivity in the upper mantle appears as a maximum at the top of oceanic asthenosphere due to the negative correction for pressure and positive correction for water content, which well explains the high conductivity anomaly observed at ∼70–120 km depth beneath young oceanic plates. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110056
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, D95440, Germany; Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori, 6820193, Japan; Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Tokyo, 1130032, Japan; Isotope Imaging Laboratory, Creative Research Institution, Hokkaido University, Sapporo, 0010021, Japan; Department of Natural History Sciences, Hokkaido University, Sapporo, 0600810, Japan; Research Center for Planetary Trace Organic Compounds, Kyushu University, Motooka, Nishi-ku, Fukuoka, 8190395, Japan

Recommended Citation:
Fei H.,Koizumi S.,Sakamoto N.,et al. Mg lattice diffusion in iron-free olivine and implications to conductivity anomaly in the oceanic asthenosphere[J]. Earth and Planetary Science Letters,2018-01-01,484
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