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首页> 外文期刊>Nature >Plume-like neon in a metasomatic apatite from the Australian lithospheric mantle
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Plume-like neon in a metasomatic apatite from the Australian lithospheric mantle

机译：澳大利亚岩石圈地幔的交代磷灰石中的似羽状氖

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The nature of metasomatizing fluids and melts in the mantle are of interest for understanding the chemical evolution of the Earth's interior. The study of noble-gas isotopes in appropriate mantle-derived samples has the potential to provide valuable insight into this question, by constraining the origin of the fluids and the timing of metasomatic events. Here we report the application of neon-isotope systematics to investigate the metasomatic history of apatite grains in spinel-lherzolite xenoliths from the Australian lithospheric mantle. We find that the apatite has a neon-isotope signature similar to that associated with plume-related volcanism, as is found in Hawaii, whereas coexisting mineral phases (olivine and amphibole) and non-apatite-bearing lherzolites have isotope signatures more typical of mid-ocean-ridge basalts. The occurrence of plume-like neon in the apatite implicates deep plume-like material beneath southeastern Australia as the source of the metasomatizing agent.
机译：对地幔中的流体和熔体进行交代化的性质对于理解地球内部的化学演化很感兴趣。在适当的地幔衍生样品中进行稀有气体同位素的研究，有可能通过限制流体的起源和变质事件的发生时间，对该问题提供有价值的见解。在这里，我们报告了氖同位素系统学的应用，以研究澳大利亚岩石圈地幔中尖晶石-锂铁矿异岩中磷灰石颗粒的交代历史。我们发现，磷灰石的氖同位素特征类似于与羽流相关的火山作用，就像在夏威夷发现的那样，而共存的矿物相（橄榄石和闪石）和不含磷灰石的锂铁矿具有同位素特征，这种特征在中期更为典型。 -洋脊玄武岩。磷灰石中羽状霓虹的出现暗示着澳大利亚东南部下方的深羽状物质是交代作用物质的来源。

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