Diffusion of hydrogen in ringwoodite

Takahide Kudo, Eiji Ohtani, Ryota Hae, Akira Shimojuku

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationWATER DYNAMICS
Subtitle of host publication3rd International Workshop on Water Dynamics
Pages148-149
Number of pages2
DOIs
Publication statusPublished - 2006 May 15
EventWATER DYANMICS: 3rd International Workshop on Water Dynamics - Sendai, Japan
Duration: 2005 Nov 162005 Nov 17

Publication series

NameAIP Conference Proceedings
Volume833
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

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

Keywords

  • Diffusion
  • Hydrogen
  • Mantle transition Zone
  • Ringwoodite

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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