地球核形成過程における平衡と非平衡

• 大谷 栄治

  東北大学大学院理学研究科

書誌事項

タイトル別名

• Metal-Silicate Equilibrium in the Core Formation of the Earth.
• チキュウカク ケイセイ カテイ ニ オケル ヘイコウ ト ヒヘイコウ

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

  鉱物学雜誌 27 (3), 179-184, 1998

  一般社団法人　日本鉱物科学会

詳細情報

• CRID: 1390282681503248896
• NII論文ID: 10008769781
• NII書誌ID: AN00084868
• DOI: 10.2465/gkk1952.27.179
• ISSN: 18837018
• ISSN: 04541146
• NDL書誌ID: 4557301
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4557301
• 本文言語コード: ja
• データソース種別:
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• 抄録ライセンスフラグ: 使用不可