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首页> 外文期刊>Meteoritics & planetary science >A petrological, mineralogical, and chemical analysis of the lunar mare basalt meteorite LaPaz Icefield 02205, 02224, and 02226
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A petrological, mineralogical, and chemical analysis of the lunar mare basalt meteorite LaPaz Icefield 02205, 02224, and 02226

机译：月球玄武岩陨石拉巴斯冰场02205、02224和02226的岩石学，矿物学和化学分析

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摘要

LaPaz Icefield (LAP) 02205, 02226, and 02224 are paired stones of a crystalline basaltic lunar meteorite with a low-Ti (3.21-3.43% TiO2) low-Al (9.93-10.45% Al2O3), and low-K (0.11-0.12% K2O) composition. They consist mainly of zoned pyroxene and plagioclase grains, with minor ilmenite, spinel, and mesostasis regions. Large, possibly xenocrystic, forsteritic olivine grains (< 3% by mode) contain small trapped multiphase melt inclusions. Accessory mineral and mesostasis composition shows that the samples have experienced residual melt crystallization with silica oversaturation and late-stage liquid immiscibility. Our section of LAP 02224 has a vesicular fusion crust, implying that it was at one time located sufficiently close to the lunar surface environment to have accumulated solar-wind-implanted gases.
机译：LaPaz Icefield（LAP）02205、02226和02224是具有低Ti（3.21-3.43％TiO2）低Al（9.93-10.45％Al2O3）和低K（0.11- 0.12％K2O）组成。它们主要由带状辉石和斜长石晶粒组成，还有少量的钛铁矿，尖晶石和介晶滞区域。大的，可能为异相的，方解石的橄榄石晶粒（按模式<3％）包含较小的捕获多相熔体包裹体。矿物和介晶的辅助成分表明，样品经历了残留的熔融结晶，而二氧化硅过饱和并且与后期液体不混溶。我们的LAP 02224剖面上有一个囊泡状熔结壳，这意味着它一次位于离月球表面环境足够近的位置，以积累太阳风注入的气体。

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