フィロシリケートの多様性と過去の水性活動が火星のマーウ・ヴァリスで明らかになった
Janice L Bishop1, Eldar Z Noe Dobrea, Nancy K McKeown
1SETI Institute and NASA Ames Research Center, Mountain View, CA 94043, USA. jbishop@seti.org
Science (New York, N.Y.)
|August 9, 2008
まとめ
火星 火星 火星 火星
科学分野:
- 惑星科学は惑星科学である.
- 天体生物学 アストロバイオロジー
- 地質学 地質学 地質学
背景:
- 火星上のマーウ・ヴァリスは,多様なフィロシリケート種を展示しています.
- これらの鉱物は,過去の大規模な水中の活動を示しています.
- ミネラロジーの理解は,火星の環境史を再構築するのに役立ちます.
研究 の 目的:
- マール・ヴァリスの鉱物成分を分析するために,火星偵察軌道探査機のデータを用いた.
- 水質変化のシーケンスと影響を調査する.
- 潜在的なバイオシグネチャーや水熱活動を探求するためです.
主な方法:
- 火星のコンパクト偵察画像スペクトロメーター (CRISM) を使用して,明るい色調の突起のスペクトロスコープ分析.
- ミネラル層のストラティグラフィック分析.
- 陸上の鉱物形成プロセスとの比較.
主要な成果:
- 古代の玄武岩地形で確認された鉄/マグネシウム (Fe/Mg) -スメクタイト.
- 水素化シリカ,モンモリヨニット,カオリニットに富んだ上層単位を観測した.
- 特定の層図的移行におけるFe2+相に起因するスペクトル特徴を検出しました.
結論:
- ミネラル層図は,マーウ・ヴァリス ( Mawrth Vallis) の複雑な水の歴史を示唆している.
- Fe2+相は,水熱活動や微生物の影響を示している可能性があります.
- 将来の研究は,過去の火星の居住可能性の理解を洗練することができます.
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