The origin of volatiles in the Moon’s interior is debated. Scenarios range from inheritance through a Moon-forming disk or “synestia” to late accretion by meteorites or comets. Noble gases are excellent tracers of volatile origins. We report analyses of all noble gases in paired, unbrecciated lunar mare basalts and show that magmatic glasses therein contain indigenous noble gases including solar-type He and Ne. Assimilation of solar wind (SW)–bearing regolith by the basaltic melt or SW implantation into the basalts is excluded on the basis of the petrological context of the samples, as well as the lack of SW and “excess 40 Ar” in the magmatic minerals. The absence of chondritic primordial He and Ne signatures excludes exogenous contamination. We thus conclude that the Moon inherited indigenous noble gases from Earth’s mantle by the Moon-forming impact and propose storage in the incompatible element-enriched (“KREEP”) reservoir.

中文翻译：

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月球内部的本土稀有气体

月球内部挥发物的来源存在争议。情景范围从通过月球形成盘或“synestia”继承到陨石或彗星的晚期吸积。稀有气体是挥发性来源的极好示踪剂。我们报告了对成对的未角砾月母玄武岩中所有惰性气体的分析，并表明其中的岩浆玻璃含有本土惰性气体，包括太阳型 He 和 Ne。基于样品的岩石学背景，以及缺乏 SW 和“过量40Ar”在岩浆矿物中。缺乏球粒状原始 He 和 Ne 特征排除了外源性污染。因此，我们得出结论，月球通过形成月球的撞击从地幔中继承了本土惰性气体，并建议将其储存在不相容的富元素（“KREEP”）储层中。