地球のマントルのコンドリートクセノン
Antonio Caracausi1,2, Guillaume Avice2, Peter G Burnard2
1Instituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, 90146 Palermo, Italy.
Nature
|April 26, 2016
まとめ
地球のマントルと大気中の揮発性物質の 異なる起源を示しています クセノンの同位体分析は,大気前駆体から分離した,マントルの揮発性物質の小惑星源を示し,初期の地球増殖プロセスを示唆している.
科学分野:
- 地化学
- 宇宙化学
- 同位体地質学
背景:
- マグマガス中の貴重ガス同位体は,地球の揮発性起源,マントルの進化,大気組成の洞察を提供します.
- 地球のマントルと大気中の惑星ガスの二重起源は,分析の進歩にもかかわらず,十分に制限されていません.
研究 の 目的:
- 地球のマントルと大気中の揮発性物質の起源を研究する
- 地球のマントルと大気中の 揮発性物質の宇宙化学的源を 決定する
主な方法:
- ドイツのエーフェル火山地帯のマグマガスの高精度分析.
- クセノンの同位体体系は 揮発性の起源を追跡する
主要な成果:
- 軽いクセノンの同位体は,大気中のクセノンの前駆体とは異なる,マントルの原始的なコンドリート成分を示している.
- 地球の大気圏とマントルの揮発性物質は 異なる宇宙化学源から発生した可能性が高い.
- エイフェルのマグマリズムは,約445億年前から分離された深層マントルの羽根から発生し,大洋の真ん中の玄武岩源よりも揮発性/耐火性の比率が低い.
結論:
- 地球のマントルと大気の揮発性物質は異なる起源を持ち,マントルの揮発性物質は小惑星の源から派生した可能性が高い.
- クセノン同位体データは,地球マントルの重複期に遡る重要な化学的異質性を明らかにしている.
- この発見は,初期のマントル領域の分離モデルを支持し,初期の地球の蓄積過程で揮発性物質が増加していることを強調しています.
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