月の隕石の源を特定する:月の進化への影響

Edwin Gnos¹, Beda A Hofmann, Ali Al-Kathiri

¹Institut für Geologie, Universität Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland. gnos@geo.unibe.ch

Science (New York, N.Y.)

|August 3, 2004

まとめ

稀土元素に富んだ月面隕石"サイ・アル・ウハイミール169"は,古代の4つの月面衝突を明らかにしている. その構成はインブリウム盆地とラランデクレーターと結びついている.

科学分野:

地質化学地質化学
月科学月科学月科学
惑星地質学惑星地質学

背景:

月面の隕石は,月面の構成と衝突の歴史についての洞察を提供します.
サイ・アル・ウハイミール169 (SAU 169) 隕石は,異常な元素濃縮による衝突溶融ブレッチアである.

研究の目的:

SAU 169月の隕石の組成と同位体体系論を分析する.
隕石が記録した衝突履歴を決定するために.
月面上の隕石の源地を特定する.

主な方法:

稀土元素,ソリウム,ウラン,カリウムを含む主要元素と微量元素の地化学分析.
イソトープの体系的分析から現在の衝撃事件まで.
隕石のデータと月の地質学的な特徴と衝突モデルの比較.

主要な成果:

SAU 169は,カリウム,希土元素,そしてリンが非常に豊富に含まれています.
イソトープデータは,約3909万年前,2800万年前,200万年前,および<0.34万年前における4つの異なる月面衝突イベントを示しています.
隕石は9.7 +/- 1.3千年前に地球に衝突した.

結論:

SAU 169の衝突溶融ブレッチア成分は,インブリウム流域と関連付けることができます.
SAU 169隕石の源地は,ラランデ衝突クレーターとして知られています.

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