メルキュアの空洞: MESSENGERは,地質学的に最近の揮発性関連活動の証拠である
David T Blewett1, Nancy L Chabot, Brett W Denevi
1The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA. david.blewett@jhuapl.edu
まとめ
水星上の明るい穴は,水星の明るい穴である.
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
- 天文学 天文学
背景:
- 水星の表面は,衝突クレーター内のユニークな明るい堆積物を示しています.
- これらの特徴は,高反射率のインテリアを持つ浅い,縁のない低谷として現れます.
研究 の 目的:
- 水星のこれらの明るい空洞の形態と潜在的な形成メカニズムを分析する.
- 観測された地表の特徴に基づいて,水星の地下層の組成を推論する.
主な方法:
- 水星の表面の高解像度の軌道画像の分析.
- 衝突クレーター洞穴の形状学的な特徴,サイズ,形状,反射率を含む.
- 空洞形成に起因する地質学的過程の解釈.
主要な成果:
- 水星の多くの新鮮な,不規則な,浅い,縁のない深み (穴) を特定しました.
- 洞穴は数十メートルから数キロメートルの幅があり,しばしば明るい内部とハロが描かれています.
- クレーターの中央の頂点と床に関連する宿主岩は,深部から発掘することを示唆しています.
結論:
- 空洞形成には,潜化,宇宙気象,ガス排出,または火山活動による揮発性損失が含まれる可能性が高い.
- これらの特徴は,以前予測されたよりも水星上の地表下の高揮発性物質の含有量が高いことを示しています.
- この発見は,太陽系内部の惑星形成に関する既存のモデルに異議を唱えている.
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