下部マントルの流動特性 Rheological Properties of the Lower Mantle

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The earth's lower mantle is mainly composed of (Mg, Fe) SiO<SUB>3</SUB> perovskite and (Mg, Fe) O magneSiOwustite. It is essential to determine the rheological properties of MgSiO<SUB>3</SUB> perovskite and periclase for understanding the rheology of the lower mantle. High pressure and temperature experiments were carried out under lower mantle conditions to determine their rheological properties. The grain growth rates of perovskite and periclase were determined to be G<SUP>10. 6</SUP> [m] = 1×10<SUP>-57. 4</SUP>t [sec] exp (-320. 8 [kJ/mol] /RT) and G<SUP>10. 8</SUP> [m] =1×10<SUP>-62. 3</SUP>t [sec] exp (-247. 0[kJ/mol]/RT), respectively, where G is grain size at time t, R is the gas constant and T is the absolute temperature. The lattice diffuSion coefficient (D<SUB>1</SUB>) and grain boundary diffuSion coefficient (D<SUB>gb</SUB>) of silicon in MgSiO<SUB>3</SUB> perovskite were determined at 25GPa and 1673-2073 K to be D<SUB>1</SUB> [m<SUP>2</SUP>/sec] = 3. 76×10<SUP>-10</SUP>exp (-338 [kJ/mol] /RT) and δD<SUB>gb</SUB> [m<SUP>3</SUP>/sec] =1. 02×10<SUP>-16</SUP>exp (-303 [kJ/mol]/RT), respectively, where δ is the width of the grain boundary. The grain size of perovskite in the lower mantle is estimated to be 1-10 mm, which suggests diffusion creep (Nabarro-Herring creep) as a dominant deformation mechanism in the greater part of the lower mantle. The present results indicate that the subducting slab is much softer than the surrounding lower mantle due to the slow grain growth rate.

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 9(1), 19-25, 1999-02-20 

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002849740
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4674352
  • 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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