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Updated: May 30, 2026

06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
月が若く,あるいは地球規模のマグマ海洋が存在しなかったという年代的証拠
Lars E Borg1, James N Connelly, Maud Boyet
1Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue L-231, Livermore, California 94550, USA. borg5@llnl.gov
Nature
|August 19, 2011
まとめ
月面の最も古い地殻の岩石であるフェローアンオルソサイト (FAN) は,原始的なマグマ海洋から生じたものではないかもしれない. 新しい同位体年代測定は,驚くほど若い結晶化年齢を示唆し,既存の月の形成理論に挑戦しています.
科学分野:
- 惑星科学は惑星科学である.
- 地質化学 地質化学
- イソトープジオクロノロジー
背景:
- 月を含む惑星の微分化は,マグマの海洋固化から始まると理論化されています.
- フェロアン・アノルソサイト (FAN) は,月面の原発的な地殻岩と考えられており,マグマの海洋結晶化の遅い段階で形成されています.
- 以前のFANの年代測定の試みは,同位体不適合性のために曖昧な結果をもたらしました.
研究 の 目的:
- 鉄アンソソサイト (FAN) の結晶化年齢を正確に決定するために 60025.
- 月面地殻形成に関する支配的なマグマ海洋仮説を再評価する.
主な方法:
- 精密な年齢決定のために,改良された同位体技術を使用しました.
- 適用された (207) Pb - 206) Pb, (147) Sm - 143Nd,および (146) Sm - 142Nd同位体系.
主要な成果:
- FAN 60025の結晶年齢は4360 ±300万年であると決定されました.
- この年齢は,原始的な月の地殻の岩石について以前に推定された年齢よりもかなり若い.
結論:
- この若い年齢は,FANは月面の原始的なマグマ海洋からの浮遊累積であるという長年にわたる仮定に異議を唱える.
- シリアルマグマティズムなどの代替モデルでは,月の地殻の大部分に責任がある可能性があります.
- この発見は,月の形成と進化のタイムラインの見直しを必要とする.
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