地球核形成過程における平衡と非平衡 Metal-Silicate Equilibrium in the Core Formation of the Earth

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著者

    • 大谷 栄治 OHTANI Eiji
    • 東北大学大学院理学研究科地学専攻 Insitute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University

抄録

Metal droplets separating in the magma ocean have the radius less than 1cm, and it takes about 106 seconds to separate in the magma ocean. Metallic liquid accumulated in the bottom of the magma ocean starts to fall into the lower mantle when the metal drops grow into the radius of about 1km. The present theoretical analysis implies that the small metal droplets falling into the molten magma ocean are thermally and chemically in equilibrium with the silicate magma ocean, whereas the large metal pools falling in the lower mantle are disequilibrium with the surrounding silicates. Therefore it may be possible to estimate the depth of the magma ocean from the conditions of the metal-silicate equilibrium. Abundances of Ni and Co in the mantle may be accounted for by the chemical equilibrium between metal and silicate at 40 GPa and 2500°C, suggesting existence of the primordial terrestrial magma ocean with the depth of 1200 km.

収録刊行物

  • 鉱物学雜誌 = Journal of the Mineralogical Society of Japan

    鉱物学雜誌 = Journal of the Mineralogical Society of Japan 27(3), 179-184, 1998-08-01

    Japan Association of Mineralogical Sciences

参考文献:  12件中 1-12件 を表示

各種コード

  • NII論文ID(NAID)
    10008769781
  • NII書誌ID(NCID)
    AN00084868
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    04541146
  • NDL 記事登録ID
    4557301
  • NDL 雑誌分類
    ZM46(科学技術--地球科学--岩石・鉱物・鉱床)
  • NDL 請求記号
    Z15-117
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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