メルキュアのクレーター記録は,MESSENGERの最初のフライトバイから見た

Robert G Strom¹, Clark R Chapman, William J Merline

¹Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. rstrom@lpl.arizona.edu

Science (New York, N.Y.)

|July 5, 2008

まとめ

メルキュールメルキュールメルキュールメルキュール

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:

メッセンジャーミッションは,水星の表面に関する新しいデータを提供した.
水星の地質学的歴史を理解するには,衝突クレーター形成を分析する必要があります.

研究の目的:

衝突クレーターの形態学とサイズ-周波数分布を用いて,水星の地質史を解明する.
水星上の平原ユニットの年代と起源を決定する.

主な方法:

MESSENGERのフライバイデータから得られた衝突クレーターの形状とサイズ-周波数分布の分析.
クレーター密度と大きさの分布を月と火星のデータと比較.

主要な成果:

カロリス盆地の内陸の平原は,似たような年齢を持っています.
表面の平らな平原は火山によるもので,衝突からの噴出物ではなく,38億年前に形成された.
水星上の二次クレーターは,直径 ≤ 810 km のプライマリーより優位である.
ピークリング盆地ラディタラディは10億年未満かもしれない.

結論:

水星の平原は,その火山と衝撃の歴史についての洞察を提供します.
水星上の二次クレーターの普及は,月と火星と比較して異なる衝撃体制を示唆しています.
ラディットラディ流域の年齢は,現在進行中の地質学的活動を示しています.

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