火星の水文学的プロセスへの影響は,Terra Meridiani全体に広がる広範囲の岩床の露出から生じます
1Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80309, USA. brian.hynek@lasp.colorado.edu
Nature
|September 10, 2004
まとめ
火星のテラ・メリディアニ地域にある灰色のヘマタイトは,長期にわたる水の存在を示唆している. リモートセンシングは,広範囲に広がる軽い色調の露出を明らかにし,大規模な火星の領域に広がる広大な表面または近地水を示しています.
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:
- 灰色ヘマタイトは,火星のテラ・メリディアン領域で,火星グローバルサーベイヤーによって検出されました.
- 地球上のヘマタイトの形成は,通常,長時間液体の水の存在を必要とします.
- 火星探査ローバーオポチュニティは,メリディアニで地元の水相互作用のサインを特定しました.
研究 の 目的:
- オポチュニティの着陸地にある明るい色調の突起が局所的な現象であるかどうかを判断する.
- これらの水によって変化した材料の地域的な範囲を調査する.
- 火星の水の歴史と範囲を推論する.
主な方法:
- 視覚的および熱的赤外線スペクトルを含む遠隔感知データの分析.
- テラ・メリディアニの平原を横断する明るい色調の突起の地図作成.
- 遥感データとローバーのデータとの比較.
主要な成果:
- 浅い色色の露出は,着陸地点に限ったものではなく,ヘマチットを含む平原全体に広く広がっています.
- これらの突起は,可視赤外線および熱赤外線遠隔検知データの両方で観測できます.
- 素材は数百キロメートルにわたってマッピングされ,推定3 × 10 (5) km をカバーしています.
結論:
- 浅い色の露出地が広く分布していることは,地表または地表近くの水の重要な地域的存在を示しています.
- この発見は,火星のTerra Meridiani領域で水活動が広がったという仮説を裏付けている.
- この研究は,火星の水のある過去に関する重要な証拠を提供します.
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