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Updated: May 7, 2026

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Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
火星のゲールクレーターでの好奇心: ロックネストの砂影の特徴と分析
D F Blake1, R V Morris, G Kocurek
1National Aeronautics and Space Administration Ames Research Center, Moffett Field, CA 94035, USA. david.blake@nasa.gov
まとめ
火星のロックネスト (Rocknest) エオリア鉱床は,火星探査ローバー (MER) が発見した物質と類似点を持っています. その構成は,玄武岩の起源を示唆し,重要な揮発性物質を宿し,類似した火星の材料が広く広がっていることを示しています.
科学分野:
- 惑星科学 惑星科学
- アストロジオロジー アストロジオロジー
- 火星探査 火星探査
背景:
- エオリア堆積は,惑星の表面上の風が吹いた地質学的な特徴です.
- 前回の火星探査ローバー (MERs) は,玄武岩土とエオリアの特徴を分析しました.
- 火星の土壌の組成を理解することは,過去の居住可能性と地質学的プロセスを評価するために不可欠です.
研究 の 目的:
- ロックネストエオリア鉱床の鉱物学的および化学的組成を特徴付けるために.
- ロックネストの組成を,MERs.によって以前に分析された材料と比較する.
- 火星上の玄武岩物質の起源と分布を推論する.
主な方法:
- ロックネスト (Rocknest) のエオリア鉱床から採取した砂の大きさ (<150μm) の粒子の分析.
- 結晶と無形物質の分子を決定するために,X線 difraktionと化学分析を行います.
- 火星でのサンプルの分析 (SAM) 装置を使用して,揮発性化合物の識別.
主要な成果:
- ロックネスト砂は,約55%の結晶物質 (ベースルティック遺産) と45%のX線無形物質で構成されています.
- アモルフな成分は鉄が多く,シリコンが少なく,揮発性物質 (水,酸素,二酸化硫黄,二酸化炭素,塩素) を含んでいる.
- MERで分析された玄武岩土で発見されたものと類似した,細粒子のナノフェーズ酸化物成分が特定されました.
結論:
- ロックネスト鉱床の組成は,玄武岩の起源と一致しています.
- グセフ・クレーター,メリディアニ・プランウム,ゲール・クレーターで類似した材料の存在は,現地で採取された,世界的に類似した玄武岩材料か,広範囲に広がった玄武岩成分であることを示唆しています.
- これらの発見は,共通の地質的遺産と,火星のエオリアと土壌材料の堆積過程を暗示しています.
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