确定月球陨石的来源：对月球演化的启示
Pinpointing the source of a lunar meteorite: implications for the evolution of the Moon.
作者信息
Gnos Edwin, Hofmann Beda A, Al-Kathiri Ali, Lorenzetti Silvio, Eugster Otto, Whitehouse Martin J, Villa Igor M, Jull A J Timothy, Eikenberg Jost, Spettel Bernhard, Krähenbühl Urs, Franchi Ian A, Greenwood Richard C
机构信息
Institut für Geologie, Universität Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland.
出版信息
Science. 2004 Jul 30;305(5684):657-9. doi: 10.1126/science.1099397.
The lunar meteorite Sayh al Uhaymir 169 consists of an impact melt breccia extremely enriched with potassium, rare earth elements, and phosphorus [thorium, 32.7 parts per million (ppm); uranium, 8.6 ppm; potassium oxide, 0.54 weight percent], and adherent regolith. The isotope systematics of the meteorite record four lunar impact events at 3909 +/- 13 million years ago (Ma), approximately 2800 Ma, approximately 200 Ma, and <0.34 Ma, and collision with Earth sometime after 9.7 +/- 1.3 thousand years ago. With these data, we can link the impact-melt breccia to Imbrium and pinpoint the source region of the meteorite to the Lalande impact crater.
月球陨石赛义德·乌哈米尔169由一种极度富含钾、稀土元素和磷的撞击熔结角砾岩（钍含量为百万分之32.7；铀含量为百万分之8.6；氧化钾含量为0.54重量百分比）以及附着的风化层组成。该陨石的同位素体系记录了4次月球撞击事件，分别发生在3909±1300万年前、约28亿年前、约2亿年前以及<0.34百万年前，并且在9.7±1.3千年前的某个时间与地球发生了碰撞。利用这些数据，我们可以将撞击熔结角砾岩与雨海联系起来，并将陨石的源区精确到拉朗德撞击坑。
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