レムブラントの水銀への衝撃盆の進化
Thomas R Watters1, James W Head, Sean C Solomon
1Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560, USA. watterst@si.edu
まとめ
メッセンジャー メッセンジャー
科学分野:
- 惑星科学は惑星科学である.
- 地質学 地質学 地質学
- インパクトクラテリング (インパクトクラテリング)
背景:
- 水星には多数の衝突クレーターがあり,これは長い爆撃の歴史を示しています.
- 大規模衝突盆地では,地球の熱的進化と地質学的過程についての洞察が得られます.
研究 の 目的:
- レンブラント盆を特徴付けるには,水星の2番目に大きい,保存状態の良い衝撃構造である.
- 盆地の充填,変形,そして水星の地球進化との関係性を分析する.
主な方法:
- MESSENGERの第2回水星飛行からの高解像度画像とデータ分析.
- 埋め込みおよび変形イベントのシーケンスを決定するためのストラティグラフィック分析.
- 流域半径と流域集中の特徴の地質地図作成.
主要な成果:
- ~715km直径のレンブラント盆の発見と特徴付け.
- 独特の"ホイール・アンド・スピーク"パターンであるの脊椎とグラベンの識別.
- 火山の平原を含む,多段階の充填と変形の証拠.
- 最新の変形特徴として,約1000kmのロバート・スカープの観測.
結論:
- レンブラント盆は,水星の複雑な地質の歴史へのユニークな窓を提供します.
- その特徴は,内部収縮と外部インパクトプロセスの両方の証拠を提供します.
- 盆地の進化は,水星の地球的な冷却と収縮と結びついている.
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