地球の酸素が枯渇した液体外核の証拠
Haijun Huang1, Yingwei Fei, Lingcang Cai
1School of Sciences, Wuhan University of Technology, Wuhan, Hubei 430070, China.
Nature
|November 25, 2011
まとめ
酸素は,地球の液体外核の主要な光元素ではありません. 新しい衝撃波データは,鉄合金中の酸素が,核の観測された密度と音速プロファイルと一致しないことを示しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 宇宙化学 (コスモケミストリー)
- 高圧実験物理学の高圧実験物理学
背景:
- 地球の液体外核は主に鉄の合金で,軽い元素の10%が含まれる.
- これらの軽い元素は,コアの冷却,内部のコアの成長,コンベクション,およびジオダイナモの進化に影響を与えます.
- 酸素は,宇宙化学的な論点と蓄積化学により,主要な光元素として提案されています.
研究 の 目的:
- 地球の液体外核における主要な光元素としての酸素の役割を調査する.
- 新しい実験データを,外核の地球物理学的観測と比較する.
- 地球の核の組成と初期の地球条件への影響を制限する.
主な方法:
- 鉄-硫黄-酸素 (Fe-S-O) システムのために新しい衝撃波データを収集しました.
- 高圧条件下におけるFe-S-O合金の密度と音速の測定.
- 地球の液体外核の地球物理学的プロファイルと実験データを比較した.
主要な成果:
- Fe-S-O合金に関する実験データは,液体外核の観測された密度と音速プロファイルに同時に一致しません.
- これらの条件下では,酸素は液体外核の主要な光元素にはなれません.
- この発見は,核の軽い元素の混合物における主要な成分である酸素を排除する.
結論:
- 酸素は,地球の液体外核の主要な軽い元素である可能性は低い.
- 酸素が不足した核は,初期の地球の蓄積過程でより減少した環境を示唆しています.
- 地球の核を構成する正確な光元素を特定するためにさらなる研究が必要である.
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