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首页> 外文期刊>Philosophical transactions of the Royal Society. Mathematical, physical, and engineering sciences >Siderophile element constraints on the origin of the Moon
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Siderophile element constraints on the origin of the Moon

机译：亲铁元素对月球起源的限制

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摘要

Discovery of small enrichments in ~(182)W/~(184)Win some Archaean rocks, relative to modern mantle, suggests both exogeneous and endogenous modifications to highly siderophile element (HSE) and moderately siderophile element abundances in the terrestrial mantle. Collectively, these isotopic enrichments suggest the formation of chemically fractionated reservoirs in the terrestrial mantle that survived the putative Moon-forming giant impact, and also provide support for the late accretion hypothesis. The lunar mantle sources of volcanic glasses and basalts were depleted in HSEs relative to the terrestrialmantle by at least a factor of 20. The most likely explanations for the disparity between the Earth and Moon are either that the Moon received a disproportionately lower share of late accreted materials than the Earth, such as may have resulted from stochastic late accretion, or the major phase of late accretion occurred prior to the Moon-forming event, and the putative giant impact led to little drawdown of HSEs to the Earth's core. High precision determination of the ~(182)W isotopic composition of the Moon can help to resolve this issue.
机译：在〜（182）W /〜（184）中发现少量富集相对于现代地幔的一些古生岩石，表明对地幔中高度嗜铁亲和元素（HSE）和中等嗜铁亲和元素丰度进行了外源性和内源性修饰。总的来说，这些同位素富集表明在地幔中化学分馏储层的形成在假定的形成月球的巨大撞击中幸存下来，也为后期的增生假说提供了支持。相对于陆地地幔，HSEs中的火山玻璃和玄武岩的月地幔源至少消耗了20倍。最有可能的解释是，地球与月球之间的差异是，月球在后期增生中所占的比例过低可能是由于随机的后期积聚或后期积聚的主要阶段发生在月球形成事件之前，而不是地球产生的物质，而假定的巨大影响导致HSE几乎没有降落到地球核心。高精度确定月球〜（182）W同位素组成有助于解决此问题。

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