Journal
RUSSIAN GEOLOGY AND GEOPHYSICS
Volume 50, Issue 12, Pages 1073-1078Publisher
RUSSIAN ACAD SCIENCES, SIBERIAN BRANCH, VS SOBOLEV INST GEOL & MINEROL
DOI: 10.1016/j.rgg.2009.11.006
Keywords
diffusion; hydrogen; mantle; subduction slabs
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Funding
- Ministry of Education, Culture, Science, Sport, and Technology of the Japanese Government
- Tohoku University
- Global Research and Education Center for the Earth and Planetary Dynamics
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Mineral physics data related to the deep dehydration of stagnant slabs are summarized. The hydrogen diffusion in minerals of the mantle transition zone is not fast enough to homogenize the transition zone on the geological time scale, and hydrogen is expected to be unevenly distributed there. The hydrous fluid formed in the transition zone tends to percolate into shallower depths to form gravitationally stable hydrous magmas at the base of the upper mantle. We need further studies on the relation of intraplate volcanism above the stagnant slab and deep dehydration, because we expect the geochemical fingerprints of deep dehydration to be quite different from those of shallow dehydration from the subducting slabs. (C) 2009, IGM, Siberian Branch of the RAS. Published by Elsevier B. V. All rights reserved.
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