Northwest Africa (NWA) 11962 is a lunar regolith breccia composed of a wide range of different clasts. The lunar origin of this meteorite is confirmed by oxygen isotope analysis and the Fe/Mn ratio in pyroxene and olivine. In the present study, the clasts and the matrix of NWA 11962 are characterized by optical and electron microscopy along with electron microprobe analyses and micro-Raman spectroscopy. The meteorite has a glassy impact melt matrix, which accounts for 35% of the surface area in the two thin sections examined, and which contains a very large variety of different lithic clasts, monomineralic clasts, and glass fragments. The presence of volcanic and impact-related glass spherules led to the classification of this meteorite as a regolith breccia. Lithic clasts include numerous fragments of quartz monzogabbro and lunar felsite, which are quite rare lithologies in the lunar alkali suite. However, the most abundant components in the breccia are gabbroic clasts. The mineral chemistry of the pyroxenes in the gabbroic clasts and the chemistry of various types of glass fragments in the breccia indicate an origin of the regolith from an area with low-Ti to high-Ti mare basalt volcanism. In addition to the peculiar petrographic characteristics of NWA 11962, the possible pairing relationships with other lunar meteorites are discussed.

中文翻译：

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11962 年非洲西北部月球陨石：风化角砾岩，包含富含钛的月球火山活动和高碱套件的记录

西北非洲 (NWA) 11962 是一个月球风化角砾岩，由多种不同的碎屑组成。通过氧同位素分析以及辉石和橄榄石中的 Fe/Mn 比值，证实了这块陨石的月球起源。在本研究中，NWA 11962 的碎屑和基质通过光学和电子显微镜以及电子探针分析和显微拉曼光谱进行表征。陨石具有玻璃状撞击熔体基质，在所检查的两个薄片中占表面积的 35%，其中包含种类繁多的不同岩屑碎屑、单矿物碎屑和玻璃碎片。火山和与撞击相关的玻璃球的存在导致这颗陨石被归类为风化角砾岩。岩屑包括许多石英monzogabbro和月球长石的碎片，是月碱地层中极为罕见的岩性。然而，角砾岩中最丰富的成分是辉长岩碎屑。辉长岩碎屑中辉石的矿物化学和角砾岩中各种玻璃碎片的化学表明风化层起源于低钛至高钛玄武岩火山活动的区域。除了 NWA 11962 独特的岩相特征外，还讨论了与其他月球陨石可能的配对关系。