スピリット・ローバーがグセフクレーターで分析した玄武岩
H Y McSween1, R E Arvidson, J F Bell
1Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996-1410, USA. mcsween@utk.edu
Science (New York, N.Y.)
|August 7, 2004
まとめ
スピリット・ローバーは,火星のグセフ・クレーター着陸地でピクリティックベースアルティック・ラバを発見した. オリヴィンとピロキセンの豊富なこれらの岩石は,火星の地殻の組成に関する私たちの理解を広げています.
科学分野:
- 地質学 地質学 地質学
- 惑星科学は惑星科学である.
- ミネラロジーは,鉱物学です.
背景:
- スピリット・ローバーは,火星のグセフクレーター (Gusev Crater) を調査した.
- 着陸地には,暗く,細粒度で,溶岩として解釈される膀状の岩が特徴です.
研究 の 目的:
- スピリット着陸地の岩の構成と起源を特徴付けるため.
- 火星の地殻の組成の既知の範囲を拡大する.
主な方法:
- パンカムとミニ熱放出スペクトロメーター (Mini-TES) のスペクトルの分析.
- ブラシで磨いた岩の表面の拡大画像の調査.
- アルファ粒子X線スペクトロメーター (APXS) を使用した化学分析.
- モッズバウアー光譜法. モッズバウアー光譜法.
主要な成果:
- 岩は似ているが,変異する層と塵のマントを持っている.
- 変化した皮と静脈は岩の表面で目に見える.
- 岩の内部には,最大25%のメガクリスタルが含まれています.
- 化学的およびスペクトル分析は,オリビン,ピロキセン,プラジオクラゼ,FeTi酸化物の規範性を持つピクリト基岩を示しています.
- オリビン,磁石,そしておそらくピロキセンの存在が確認されています.
結論:
- 分析された岩石はピクリト基岩と一致しています.
- これらの発見は,火星上の岩石の多様性についての理解を広げています.
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