First principles prediction of a new high‐pressure phase of dense hydrous magnesium silicates in the lower mantle

DOI Web Site Web Site 被引用文献27件 参考文献30件 オープンアクセス
  • Jun Tsuchiya
    Geodynamics Research Center Ehime University Matsuyama Japan

書誌事項

公開日
2013-09-04
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/grl.50875
公開者
American Geophysical Union (AGU)

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説明

<jats:p>First principles calculations have shown that the high‐pressure phase transition of phase D MgSi<jats:sub>2</jats:sub><jats:italic>O</jats:italic><jats:sub>6</jats:sub><jats:italic>H</jats:italic><jats:sub>2</jats:sub> to the new high‐pressure hydrous phase MgSiO<jats:sub>4</jats:sub><jats:italic>H</jats:italic><jats:sub>2</jats:sub> plus stishovite occurs at about 40 GPa. The crystal structure of the new phase is very similar to that of CaCl<jats:sub>2</jats:sub>‐type SiO<jats:sub>2</jats:sub> and has monoclinic symmetry with space group <jats:italic>P2/m</jats:italic>. This new hydrous phase is stable up to about 52 GPa and then dissociates into MgSiO<jats:sub>3</jats:sub> perovskite and H<jats:sub>2</jats:sub>O (ice VIII) at static 0 K conditions. The Clapeyron slope between phase D and the new phase + SiO<jats:sub>2</jats:sub> is positive; about 6.4 MPa/K at 1000 K. This new hydrous phase further extends the stability field of dense hydrous magnesium silicates and also opens the pathway toward the existence of a high‐pressure phase of ice at the lower mantle conditions.</jats:p>

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