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DOI	10.1016/j.epsl.2021.116815
	Hydrogen diffusion mechanism in the mantle deduced from H-D interdiffusion in wadsleyite
	Sun W.; Yoshino T.; Sakamoto N.; Yurimoto H.
发表日期	2021
ISSN	0012821X
卷号	561
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
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203302
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
推荐引用方式 GB/T 7714	Sun W.,Yoshino T.,Sakamoto N.,et al. Hydrogen diffusion mechanism in the mantle deduced from H-D interdiffusion in wadsleyite[J],2021,561.
APA	Sun W.,Yoshino T.,Sakamoto N.,&Yurimoto H..(2021).Hydrogen diffusion mechanism in the mantle deduced from H-D interdiffusion in wadsleyite.Earth and Planetary Science Letters,561.
MLA	Sun W.,et al."Hydrogen diffusion mechanism in the mantle deduced from H-D interdiffusion in wadsleyite".Earth and Planetary Science Letters 561(2021).