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Extinct ~(244)Pu in Ancient Zircons

机译:绝灭〜(244)Pu在古锆石中

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摘要

We have found evidence, in the form of fissiogenic xenon isotopes, for in situ decay of ~(244)Pu in individual 4.1- to 4.2-billion-year-old zircons from the Jack Hills region of Western Australia. Because of its short half-life, 82 million years, ~(244)Pu was extinct within 600 million years of Earth's formation. Detrital zircons are the only known relics to have survived from this period, and a study of their Pu geochemistry will allow us to date ancient metamorphic events and determine the terrestrial Pu/U ratio for comparison with the solar ratio.
机译:我们已经找到了以致裂性氙同位素的形式存在的证据,证明了西澳大利亚杰克山地区4.1至42亿年前的锆石中〜(244)Pu的原位衰减。由于其短的半衰期(8200万年),〜(244)Pu在地球形成的6亿年之内就灭绝了。碎屑锆石是这个时期中唯一幸存的遗迹,对它们的Pu地球化学的研究将使我们能够确定古代变质事件的年代,并确定地球Pu / U比值与日照比值进行比较。

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