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古代锆石中已灭绝的244Pu

Extinct 244Pu in ancient zircons.

作者信息

Turner Grenville, Harrison T Mark, Holland Greg, Mojzsis Stephen J, Gilmour Jamie

机构信息

Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK.

出版信息

Science. 2004 Oct 1;306(5693):89-91. doi: 10.1126/science.1101014.

Abstract

We have found evidence, in the form of fissiogenic xenon isotopes, for in situ decay of 244Pu 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, 244Pu 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.

摘要

我们已发现以裂变成因氙同位素形式存在的证据,表明在西澳大利亚杰克山地区单个41亿至42亿年前的锆石中,钚-244发生了原位衰变。由于钚-244半衰期较短,仅8200万年,它在地球形成后的6亿年内就已灭绝。碎屑锆石是已知唯一从这一时期留存下来的遗迹,对其钚地球化学的研究将使我们能够测定古代变质事件的年代,并确定地球的钚/铀比率,以便与太阳比率进行比较。

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