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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Lunar feldspathic meteorites: Constraints on the geology of the lunar highlands, and the origin of the lunar crust
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Lunar feldspathic meteorites: Constraints on the geology of the lunar highlands, and the origin of the lunar crust

机译：月球长石陨石：对月球高地的地质和月球壳的起源的限制

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摘要

The composition of the lunar crust provides clues about the processes that formed it and hence contains information on the origin and evolution of the Moon. Current understanding of lunar evolution is built on the Lunar Magma Ocean hypothesis that early in its history, the Moon was wholly or mostly molten. This hypothesis is based on analyses of Apollo samples of ferroan anorthosites (>90% plagioclase; molar Mg/(Mg + Fe) = Mg# < 75) and the assumption that they are globally distributed. However, new results from lunar meteorites, which are random samples of the Moon's surface, and remote sensing data, show that ferroan anorthosites are not globally distributed and that the Apollo highland samples, used as a basis for the model, are influenced by ejecta from the Imbrium basin. In this study we evaluate anorthosites from all currently available adequately described lunar highland meteorites, representing a more widespread sampling of the lunar highlands than Apollo samples alone, and find that ?80% of them are significantly more magnesian than Apollo ferroan anorthosites. Interestingly, Luna mission anorthosites, collected outside the continuous Imbrium ejecta, are also highly magnesian. If the lunar highland crust consists dominantly of magnesian anorthosites, as suggested by their abundance in samples sourced outside Imbrium ejecta, a reevaluation of the Lunar Magma Ocean model is a sensible step forward in the endeavor to understand lunar evolution. Our results demonstrate that lunar anorthosites are more similar in their chemical trends and mineral abundance to terrestrial massif anorthosites than to anorthosites predicted in a Lunar Magma Ocean. This analysis does not invalidate the idea of a Lunar Magma Ocean, which seems a necessity under the giant impact hypothesis for the origin of the moon. However, it does indicate that most rocks now seen at the Moon's surface are not primary products of a magma ocean alone, but are products of more complex crustal processes.
机译：月球壳的组成提供了有关形成月球的过程的线索，因此包含有关月球起源和演化的信息。当前对月球演化的理解是建立在月球岩浆海洋假说的基础上的，该假说在其历史的早期，月球完全或大部分是熔融的。该假设是基于对阿波罗亚铁原花石样品（> 90％斜长石碱;摩尔Mg /（Mg + Fe）= Mg＃<75）的分析，以及它们在全球范围内分布的假设。然而，来自月球陨石的新结果（是月球表面的随机样本）和遥感数据表明，亚铁正斜体并不全球分布，而作为该模型基础的阿波罗高地样本受到了来自Imbrium盆地。在这项研究中，我们评估了目前所有可用的描述充分的月球高地陨石的钙长石，这些陨石代表的月球高地样品比单独的阿波罗样品更广泛，并且发现其中80％的镁质明显比阿波罗二氧化铁钙长石高。有趣的是，在连续的Imbrium射出物之外收集的Luna任务的钙钛矿也是高度镁质的。如果月球高地地壳主要由镁质钙硅铁矿组成，如其在源于弹射器外的样品中的丰度所表明的那样，那么对月球岩浆海洋模型的重新评估是朝着理解月球演化的方向迈出的明智的一步。我们的研究结果表明，与在月球岩浆海洋中预测的钙硅钙石相比，月钙钙硅石在化学趋势和矿物质含量方面与陆相块状钙硅钙石更为相似。这种分析并没有使月球岩浆海洋的概念无效，在对月球起源的巨大影响假设下，这似乎是必要的。但是，这确实表明，现在在月球表面看到的大多数岩石不仅是岩浆海洋的主要产物，而是更复杂的地壳过程的产物。

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