We have conducted H 2 O partitioning experiments between wadsleyite and ringwoodite and between ringwoodite and perovskite at 1673 K and 1873 K, respectively. These experiments were performed in order to constrain the relative distribution of H 2 O in the upper mantle, the mantle transition zone, and the lower mantle. We successfully synthesized coexisting mineral assemblages of wadsleyite-ringwoodite and ringwoodite-perovskite that were large enough to measure the H 2 O contents by secondary ion mass spectrometry (SIMS). Combining our previous H 2 O partitioning data(Chen et al., 2002)with the present results, the determined water partitioning between olivine, wadsleyite, ringwoodite, and perovskite under H 2 O-rich fluid saturated conditions are 6:30:15:1, respectively. Because the maximum H 2 O storage capacity in wadsleyite is ∼3.3 wt% (e.g.Inoue et al., 1995), the possible maximum H 2 O storage capacity in the olivine high-pressure polymorphs are as follows: ∼0.7 wt% in olivine (upper mantle just above 410 km depth), ∼3.3 wt% in wadsleyite (410-520 km depth), ∼1.7 wt% in ringwoodite (520-660 km depth), and ∼0.1 wt% in perovskite (lower mantle). If we assume ∼0.2 wt% of the H 2 O content in wadsleyite in the mantle transition zone estimated by recent electrical conductivity measurements (e.g. Dai and Karato, 2009), the estimated H 2 O contents throughout the mantle are as follows; ∼0.04 wt% in olivine (upper mantle just above 410 km depth), ∼0.2 wt% in wadsleyite (410-520 km depth), ∼0.1 wt% in ringwoodite (520-660 km depth) and ∼0.007 wt% in perovskite (lower mantle). Thus, the mantle transition zone should contain a large water reservoir in the Earth's mantle compared to the upper mantle and the lower mantle.

Toru Inoue

Tomoyuki Wada

Rumi Sasaki

Hisayoshi Yurimoto

Physics of the Earth and Planetary Interiors

《地球物理学》和《行星内部》于 1968 年推出，旨在满足行星物理学、大地测量学和地球物理学领域对国际期刊的需求，现已发展成为所有地球物理学家的重要阅读材料。它是唯一完全致力于行星内部物理和化学过程的期刊。原创研究论文、评论文章、短通讯和书评均定期发表；该杂志不时发布特刊，专门刊登编辑认为读者会特别感兴趣的专题讨论会和大会的会议记录。

"Physics of the Earth and Planetary Interiors" was launched in 1968 to meet the demand for an international journal in the fields of planetary physics, geodesy, and geophysics. It has since developed into an essential reading material for all geophysicists and is the only journal fully dedicated to the physical and chemical processes of planetary interiors. The journal regularly publishes original research papers, review articles, short communications, and book reviews, and occasionally releases special issues featuring conference proceedings and discussions on topics of particular interest to readers.

《Physics of the Earth and Planetary Interiors》创刊于1968年，旨在满足行星物理学、大地测量学和地球物理学领域对国际期刊的需求。该期刊现已成为所有地球物理学家的重要阅读材料，是唯一专注于行星内部物理和化学过程的期刊。期刊定期发表原创研究论文、评论文章、短通讯和书评，并不时发布特刊，专门刊登编辑认为读者会特别感兴趣的专题讨论会和大会的会议记录。

Category	Quartile
地球科学	3
地球科学, 地球化学与地球物理	3

Water partitioning in the Earth's mantle

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Journal Info

Category	Quartile
GEOCHEMISTRY & GEOPHYSICS	2