陸上の貴気ガスシグネチャーの起源
Svyatoslav S Shcheka1, Hans Keppler
1Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany. svyatoslav.shcheka@uni-bayreuth.de
Nature
|October 12, 2012
まとめ
ゼノンはアルゴンに比べて地球の大気圏で枯渇しています. この研究は,初期の地球のペロブスキート結晶化がアルゴンを閉じ込め,大気中のクセノン枯渇につながったことを示唆しています.
科学分野:
- 地質化学 地質化学
- 惑星科学 惑星科学
- ミネラル物理学 ミネラル物理学
背景:
- クセノンは,地球と火星の大気中のアルゴンに比べて,コンドリート隕石と比較して,著しく枯渇しています.
- この大気中の貴金属ガスの枯渇の原因は,未だに十分に理解されていない.
研究 の 目的:
- 地球の下層マントルの主要な鉱物であるペロブスキート (MgSiO(3) でアルゴンとクセノンの溶解性を調査する.
- 惑星の大気中のアルゴンに対するクセノンの観測された枯渇を説明するモデルを提案する.
主な方法:
- 高圧および高温条件下におけるMgSiO ((3)) ペロブスキートにおけるアルゴンおよびクセノンの溶解性の実験的決定.
- 初期の地球と火星の大気進化の地化学モデリング.
主要な成果:
- MgSiO(3) ペロブスキートにおけるアルゴン溶解性は相当 (重量1%以上) であり,クセノン溶解性は数桁低い.
- マグマの海からのペロブスキートの結晶化は,好ましくアルゴンを下層マントルに閉じ込めます.
結論:
- ペロブスキートにおけるアルゴンとクセノンの溶解性の差異は,観測された大気の枯渇のメカニズムを提供します.
- このプロセスは,初期のマグマの海洋結晶化中に発生し,地球および潜在的に火星の大気中のクセノンとアルゴンの比率を説明します.
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