火星で水熱カルボネートの形成のための地化学モデル
1Department of Earth and Planetary Sciences, McDonnell Center for the Space Sciences, Washington University, St. Louis, Missouri 63130, USA.
Nature
|October 5, 1995
まとめ
火星は,かなりの量の二酸化炭素と水を失っているかもしれない. 水熱カルボネートは,これらの揮発性物質が火星の表面の下に閉じ込められている可能性の合理的な説明を提供します.
科学分野:
- 惑星科学 惑星科学
- 地質化学 地質化学
- 天体生物学 アストロバイオロジー
背景:
- 大量の二酸化炭素と水が火星の大気,極地層,そしてレゴリットから欠けています.
- 大気圏からの脱出と地表の堆積は,これらの揮発性物質の不足を完全に説明することはできません.
- これまでのモデルでは,火星に長期にわたって地表水や降雨が発生する可能性は低いことが示唆されています.
研究 の 目的:
- 火星で二酸化炭素を吸収する水熱システムの可能性を調査する.
- 火星の水熱環境における炭酸塩の形成をモデル化するために.
主な方法:
- アイスランドを,陸上の水熱処理の類型として利用した.
- 地化学モデリングに従事.
- 火星の隕石から推測された宿主岩の組成.
主要な成果:
- 水熱カルボネート形成は,大量の二酸化炭素を隔離するための有効なメカニズムです.
- モデルは,少なくとも1バーの大気中の二酸化炭素に相当する潜在的地下貯蔵庫を示唆しています.
- 火星の過去における広範囲にわたる熱水活動が,行方不明の揮発性物質の説明になるかもしれない.
結論:
- 水熱炭酸は,火星の揮発性赤字に説得力のある解決策を提供します.
- 水熱活動による地下貯蔵は,地表貯蔵の説明の代替案を提供します.
- このメカニズムは,火星の地質学史における過去の熱水プロセスの大切さを強調しています.
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