月の遠側マントルから派生した物質のChang'E-4の初期スペクトル検出
Chunlai Li1, Dawei Liu2, Bin Liu2
1Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China. licl@nao.cas.cn.
Nature
|May 17, 2019
まとめ
中国
科学分野:
- 惑星科学
- 月の地質学
- ミネラロジー
背景:
- 月の地殻は主にプラジオクラゼで,マグマの海から形成された不確実な構成のマフィックマントルを覆っています.
- 南極・アイトケン (SPA) 盆地のような大きな衝撃盆地では,マントルの物質が露出する可能性があります.
- 過去の軌道データでは,SPA盆地のマフィカル鉱物が示されましたが,その起源と地質的な文脈は不明でした.
研究 の 目的:
- SPA盆地内のフォン・カルマンクレーター床のマフィック物質の構成と起源を調査する.
- 月の表面鉱物を分析するために,Chang'E-4ミッションの Yutu-2ローバーからデータを活用します.
- 観測された鉱物の潜在的マントル起源とその地質的文脈を評価する.
主な方法:
- Yutu-2ローバーに搭載された可視赤外線スペクトロメーター (VNIS) のスペクトルデータ解析.
- ピロキセンとオリビンに焦点を当てた鉱物学的なサインの解釈
- 衝突クレーターからの地質学的文脈とのスペクトルデータの統合.
主要な成果:
- 最初のVNISのスペクトル観測は,低カルシウムピロキシンとオリヴィンの存在を示しています.
- これらの鉱物は月のマントルに由来する物質と一致しています
- 地質学的な文脈では これらのマントルの材料は フィンセンの衝突クレーターによって掘り起こされ,着陸地点に運ばれたと示唆されています
結論:
- この発見は,SPA盆地内の潜在的な月のマントルの材料の証拠を提供します.
- ヴォン・カルマンクレーターでの ユートー2号の探査は これらの物質を現地で研究する ユニークな機会を提供します
- 標本の起源,豊富さ,帰還の可能性を理解するために,さらなる調査が不可欠です.
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