Post-garnet Transition of Almandine at High Pressure : Phase Equilibrium and Calorimetric Studies

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High pressure high temperature transition of almandine garnet (Fe<SUB>3</SUB>Al<SUB>2</SUB>Si<SUB>3</SUB>O<SUB>12</SUB>) was examined at 20-23. 5 GPa at 1200-1600°C in the oxygen fugacity of iron-wustite buffer, using a multi-anvil apparatus. It was found that almandine dissociates into a mixture of wustite, corundum and stishovite. The dissociation boundary is placed at 20-21 GPa at 1200-1600°C with a slightly negative slope. Enthalpy of formation of almandine was measured by high temperature solution calorimetry and thus enthalpy of the almandine dissociation was obtained. The thermodynamically calculated dissociation boundary agrees with that determined by the phase equilibrium experiments. This dissociation boundary may be used as a pressure standard at around 20 GPa at high temperature. The present results in combination with those on pyrope suggest that almandine-pyrope garnet is stable in a depth range down to the upper part of the Earth's lower mantle.

収録刊行物

  • 高圧力の科学と技術 = The Review of high pressure science and technology  

    高圧力の科学と技術 = The Review of high pressure science and technology 7, 44-48, 1998 

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002688691
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4493832
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z17-1589
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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