globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116815
论文题名:
Hydrogen diffusion mechanism in the mantle deduced from H-D interdiffusion in wadsleyite
作者: Sun W.; Yoshino T.; Sakamoto N.; Yurimoto H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 561
语种: 英语
中文关键词: asymmetric ; deuterium ; diffusion ; hydrogen ; mantle ; wadsleyite
英文关键词: Deuterium ; Deuterium compounds ; Hydrogen ; Magnesium compounds ; Silicon compounds ; Single crystals ; Crystalline networks ; Diffusion driven ; Diffusion mechanisms ; Hydrogen diffusion ; Hydrogen isotope ; Interstitial defects ; Mantle xenoliths ; Nominally anhydrous minerals ; Diffusion ; asymmetry ; deuterium ; diffusion ; hydrogen ; isotopic composition ; mantle ; wadsleyite ; xenolith
英文摘要: Classical view has interpreted deuterons in nominally anhydrous minerals (NAMs) diffuse slightly slower than protons by the Knudsen limit of 2, whereas here we report deuteron diffusion is about 3∼7 times faster than proton one in Mg2SiO4 wadsleyite based on the H-D interdiffusion couple experiments using a pair of wadsleyite single crystal at 16 GPa and 900-1300 K. Our results indicate hydrogen diffusion in wadsleyite is affected by multiple diffusion mechanisms, of which, proton (deuteron) migrating along interstitial defects is particularly efficient to separate hydrogen isotopes in crystalline network probably owing to a quantum sieving effect. The resulting diffusion-driven H/D fractionation can explain common observations of deuterium depletion of NAMs in mantle xenoliths, suggesting that MORB inclusions hosted in xenoliths are more reliable for indicating the hydrogen isotope composition of the mantle rather than the xenolithic NAMs. © 2021
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165680
Appears in Collections:气候变化与战略

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作者单位: Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682-0193, Japan; Isotope Imaging Laboratory, Creative Research Institution, Hokkaido University, Sapporo, 001-0021, Japan; Department of Natural History Sciences, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan

Recommended Citation:
Sun W.,Yoshino T.,Sakamoto N.,et al. Hydrogen diffusion mechanism in the mantle deduced from H-D interdiffusion in wadsleyite[J]. Earth and Planetary Science Letters,2021-01-01,561
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