まとめ
高温は,液体金属-液体シリケート分割係数が統一に近づく原因となり,地球のマントルの組成に関する洞察を提供し,コア元素の仮説に挑戦します.
科学分野:
- 地質化学 地質化学
- 高圧実験ペトロロジー
- 惑星科学は惑星科学である.
背景:
- 地球のマントルの"過剰"の siderophile element (SE) の問題は,不完全なコア形成分離を示唆しています.
- 核とマントルの間の元素分割を理解することは,惑星の進化モデルにとって極めて重要です.
研究 の 目的:
- 高圧および高温で液体金属-液体シリケート分割係数を実験的に決定する.
- 地球の核形成における硫黄と炭素の役割を調査する.
主な方法:
- 炭素カプセルを使った高圧,高温実験.
- 混合不可能な金属およびシリケート液体間の要素分割の分析.
主要な成果:
- 複数の元素の分割係数は,100 kbar.で温度 (最大3000 K) が上昇すると,単位に収束する.
- 硫黄と炭素は,金属液体の場所のために酸素と競合し,酸素核仮説に異議を唱えます.
結論:
- 実験結果は"過剰"のシデロフィール元素の問題を部分的に説明しますが,完全に解決することはありません.
- 硫黄と炭素が酸素と競い合うことは,地球の核にある代替的な軽い元素を示唆している.
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