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Updated: Jul 13, 2026

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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
Published on: November 15, 2013
地球のマントルからの原始的な高貴ガス:原始的な揮発性成分の識別
1Lawrence Livermore National Laboratory, Post Office Box 808, Livermore, CA 94550, USA. Department of Geology, Arizona State University, Tempe, AZ 85287, USA. Department of Geology and Geophysics, University of Minnesota, Minneapol.
まとめ
地球の奥深くにある高貴なガス,特に二酸化炭素の井戸ガスのクセノン同位体は,下層マントルから発生した太陽のような成分を示唆しています. この発見は,下層マントルが現在の地球の大気の源ではないことを示しています.
科学分野:
- 地質化学 地質化学
- イソトープ地球化学 イソトープ地球化学
- 惑星科学は惑星科学である.
背景:
- 地球の地殻とマントルの高貴なガスは,惑星の形成と進化の洞察を提供します.
- クセノンイソトープ,特に特定のイソトープの過剰は,地球深層のプロセスのトレーサーとして機能することができます.
- 以前の研究では,様々な陸上の貯水池の貴重ガス組成を分析した.
研究 の 目的:
- 地球内の貴重ガスの起源と輸送を調査する.
- 地球の深い貯水池に太陽のような高貴ガス成分が含まれているかどうかを判断する.
- 地球の大気圏への地球深層の貴金属ガスの貢献を評価する.
主な方法:
- コロラド州,ニューメキシコ州,南オーストラリア州の二酸化炭素井戸ガスにおけるクセノン (Xe) とネオン (Ne) の同位体組成の分析.
- 過剰 (124-128) Xe と (129) I-derived (129) Xe と (20) Ne/(22) Ne の比率との相関関係.
- 陸上の貴気体シグネチャと大気および太陽風の組成の比較.
主要な成果:
- 二酸化炭素の井戸ガスは,特定の同位体比と相関する (124-128) Xeの過剰を示しています.
- クセノンの同位体データは,太陽のような高貴ガス成分が地球内に存在することを示唆しています.
- (20) Ne/(22) 井戸ガスのNe比は大気比より高く,明確な源を示している.
- これらの高貴なガスのマントルの源は,地球の現在の大気の起源である可能性は低い.
結論:
- 太陽のような高貴ガスの成分は,地球の深い貯水池に存在し,おそらく下層マントルから発生しています.
- 下層マントルからの高貴ガスの安定状態輸送は,地殻と上層マントルの貯蔵庫にそれらの存在を説明することができます.
- 若い揮発性物質を保持している深層マントルは,地球の現在の大気の源ではないので,代替的な大気形成または進化の経路を示唆しています.
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