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Updated: Jun 19, 2026

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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
陸上の惑星の揮発性蓄積の歴史と,その動的影響
1Ecole Normale Supérieure de Lyon, Université Claude-Bernard Lyon 1, and CNRS, 46 allée d'Italie, 69007 Lyon, France. albarede@ens-lyon.fr
Nature
|October 30, 2009
まとめ
地球と月は,湿った小惑星から形成されてからずっと前に水を得て,プレート構造と生命にとって不可欠でした. この水の供給は,太陽系が分離してから1億年後にピークに達した.
科学分野:
- 惑星科学は惑星科学である.
- 地質化学 地質化学
- 天体生物学 アストロバイオロジー
背景:
- 地球と月を含む地上の惑星は,最初は,蓄積過程により,揮発性成分が枯渇した.
- 巨大な衝突による月の形成は,おそらく原地球と月を大部分の無水状態に置き去りにした.
研究 の 目的:
- 地球と月が,その歴史のかなり後期に,揮発性物質,特に水を得たという仮説を調査する.
- 内部太陽系への遅い段階の揮発性物質の配送のタイミングと発生源を調査する.
- この水の供給がプレート構造と地球上の生命の出現に及ぼす影響を評価する.
主な方法:
- U-Pb (ウラン-鉛) とI-Xe (ヨウ素-キセノン) の年代順の分析.
- 同位体データを解釈して,不安定な配送イベントのタイミングを制限する.
主要な成果:
- U-PbとI-Xeの年代測定は,太陽系の分離から約1億年後の水の供給のピークを示しています.
- この後期的な揮発性蓄積は,地球と月が最初は乾燥した月後の形成であったことを示唆しています.
結論:
- 小惑星帯の向こうから湿った物質の遅い蓄積は,地球の水の獲得のための合理的なメカニズムです.
- 地球のマントルに水の導入は,おそらくプレート構造を誘発し,生命の出現の重要な要因である.
- この不安定な配送モデルは,金星には当てはまるかもしれませんが,火星にはあまり成功していないようです.
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