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プレームマントルに保存された高圧コア形成の初期のエピソード
Colin R M Jackson1,2, Neil R Bennett1, Zhixue Du1
1Geophysical Laboratory, Carnegie Institution of Washington, Washington DC 20015, USA.
Nature
|January 26, 2018
まとめ
初期の地球
科学分野:
- 地化学
- 宇宙化学
- 惑星科学
背景:
- マントル岩のキセノン (Xe) とボルンガム (W) の同位体異常は,地球の形成に関する洞察を提供します.
- 過去の理論はXE異常を脱ガスに結びつけましたが 同時に発生するW異常やその保存を説明できませんでした
研究 の 目的:
- 核形成中のヨウ素 (I) とプルトニウム (Pu) の分割がXe同位体異常を生成する役割を調査する.
- マントルのこの異常が 長期にわたって保存されていることを説明します
主な方法:
- 高圧と高温で液体鉄合金と液体シリケートの間のヨウ素分割の実験測定.
- 初期の地球核形成過程のモデリング.
主要な成果:
- ヨウ素は圧力の増加によりシデロフィール (鉄のような) になる.
- 高圧コア形成エピソードは,揮発性とは関係なく,マントルの有意なI / Puの枯渇につながります.
- これらの枯渇したマントルの部分はより密度が高く,その保存を助け,深いマントルの貯水池に存在することを説明します.
結論:
- 初期の高圧コア形成は,単なる脱ガスではなく, 羽根由来の玄武岩のXEとWの同位体異常の原因である.
- これらの発見は,初期の惑星の分化と,現代の地球における観測可能な地化学的特徴を結びつけています.
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