チェッシーニ隕石のクリプトンは,火星が霧状ガスの前にコンドリート性揮発物を蓄積したことを示している
Sandrine Péron1, Sujoy Mukhopadhyay1
1Department of Earth and Planetary Sciences, University of California Davis, Davis, CA 95616, USA.
まとめ
初期の火星は,チェッシーニ隕石のクリプトンイソトープによって証明された,コンドリティックな揮発性物質を含んでいた. 火星
科学分野:
- 惑星科学
- 宇宙化学
- 同位体地化学
背景:
- 陸上の惑星の揮発性元素は,しばしばコンドリート隕石の後期増殖に起因する.
- 火星は太陽系の形成の初期に 揮発性物質の提供について 洞察力を与えてくれます
研究 の 目的:
- 火星の内部と大気中の 揮発性物質の起源を調査する
- 太陽光ガスの獲得と対比して,コンドリトの揮発性物質の配送のタイミングに関する仮説を検証する.
主な方法:
- 火星の内部を代表するチェッシーニ隕石のクリプトン同位体の測定
- 火星の内部と大気の間の同位体シグネチャの比較.
主要な成果:
- チェッシーニ隕石はコンドリート・クリプトンの同位体比を示し,コンドリート・揮発性物質が火星に早期に組み込まれたことを示している.
- 火星の大気中のクリプトンは,内部と異なる太陽型の同位体比を示しています.
- 大気中のクリプトンは,マントルの形成後の,しかし, nebular 閉じる前に,太陽の nebular ガス積層に起因する.
結論:
- 火星の内部の揮発性物質は早期に獲得され,コンドリート増殖と一致しています.
- 火星の大気の独特のクリプトンシグネチャーは 内側からの脱ガスまたは分断を否定しています
- ソーラーガスの獲得に先立つ可能性があり,従来のモデルに挑戦しています.
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