関連する実験動画
Updated: Jun 28, 2026
06:04
Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
地球に欠けている鉛は,地球の中核にないかもしれない
M Lagos1, C Ballhaus, C Münker
1Steinmann-Institut, Universität Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany. lagos@uni-bonn.de
Nature
|November 7, 2008
まとめ
地球 地球 地球 地球 地球 地球
科学分野:
- 地質化学 地質化学
- 惑星科学は惑星科学である.
- 同位体地質学とは,同位体地質学である.
背景:
- 地球は,CIコンドライトと比較して,揮発性元素が枯渇しています.
- 鉛 (Pb) は揮発性があり,地球上のその枯渇は議論されている.
- 地球のマントルには独特の鉛同位体比があり,蓄積後のPb損失を示唆しています.
研究 の 目的:
- 金属硫化シリケート系における鉛の分割を調査する.
- 地球の揮発性元素,特に鉛の枯渇の背後にあるメカニズムを決定する.
- 地球の鉛不足を惑星の形成と進化モデルと調和させる.
主な方法:
- 合成金属硫化シリケート系で分割実験を行った.
- 関連する惑星条件下で鉛分割係数を分析した.
- 鉛の損失モデルを制限するために同位体分析を使用しました.
主要な成果:
- 鉛は,原子核に閉じ込められるほどのサイドロフィールやカルコフィールではない.
- 実験データは,地球の鉛不足の主なメカニズムとして硫化物溶融分離を裏付けていません.
- 鉛の損失は,コアへの分割によってのみ説明される可能性は低い.
結論:
- 地球の鉛不足は,揮発性欠乏物質の蓄積に起因する可能性がある.
- 月形成の衝突後の脱ガスによる鉛の損失は,あり得そうなシナリオです.
- 補完的な鉛イソトープシグネチャーを持つ深層マントルの貯蔵庫は可能ですが,コア収束はありそうにありません.
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06:06Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
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