Diffusion of hydrogen in ringwoodite

Takahide Kudo, Eiji Ohtani, Ryota Hae, Akira Shimojuku

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

The property of the hydrogen diffusivity in synthetic polycrystalline ringwoodite was studied by OH distribution in samples annealed under hydrothermal conditions. The experiments were conducted at 18 or 20 GPa and temperature range from 900 °C, to 1300 °C by Kawai-type multi-anvil apparatus. Diffusion in ringwoodite is about 1.5 orders of magnitude slower than in polycrystalline wadsleyite (Mg2SiO4) [Hae 2003], but it is about one order of magnitude faster than that along the c-axis (most rapidly) in single crystalline forsterite (Mg2SiO4) [Demoucy and Mackwell, 2003]. A magnitude of diffusion coefficients and activation energy obtained in our study implies that hydrogen diffusion distance is about 9.5 km in 108 years in the case of 1600°C and water is still heterogeneously distributed in the mantle transition zone. Therefore, it is thought that physical properties, such as the electrical conductivity and melting temperature, could vary in the transition zone depending on the geological settings.

本文言語English
ホスト出版物のタイトルWATER DYNAMICS
ホスト出版物のサブタイトル3rd International Workshop on Water Dynamics
ページ148-149
ページ数2
DOI
出版ステータスPublished - 2006 5 15
イベントWATER DYANMICS: 3rd International Workshop on Water Dynamics - Sendai, Japan
継続期間: 2005 11 162005 11 17

出版物シリーズ

名前AIP Conference Proceedings
833
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

OtherWATER DYANMICS: 3rd International Workshop on Water Dynamics
CountryJapan
CitySendai
Period05/11/1605/11/17

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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