First‐Principles Determination of the Dissociation Phase Boundary of Phase H MgSiO<sub>4</sub>H<sub>2</sub>

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  • Jun Tsuchiya
    Geodynamics Research Center Ehime University Matsuyama Ehime Japan
  • Koichiro Umemoto
    Earth‐Life Science Institute Tokyo Institute of Technology Japan

書誌事項

公開日
2019-07-08
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2019gl083472
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Phase H (MgSiO<jats:sub>4</jats:sub>H<jats:sub>2</jats:sub>) is considered an important carrier of water into the lower mantle by the subduction of slabs. This phase has been reported to decompose into H<jats:sub>2</jats:sub>O ice VII and MgSiO<jats:sub>3</jats:sub> bridgmanite under pressure. However, the dissociation phase boundary under the mantle pressure and temperature conditions has not been determined thus far. In this work, the dissociation phase boundary of phase H is determined by the calculation of Gibbs free energy of H<jats:sub>2</jats:sub>O ice VII. The stability field of phase H is found to be significantly extended from 52 to 62 GPa by the inclusion of zero‐point vibrational energy. Phase H decomposes into MgSiO<jats:sub>3</jats:sub> bridgmanite and H<jats:sub>2</jats:sub>O ice VII at approximately 60 GPa (at ∼1000 K). This result indicates that the transportation of water by dense hydrous magnesium silicates may be terminated at a depth of approximately 1,500 km in the middle of the lower mantle in a pure Mg‐endmember composition.</jats:p>

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