Extinct 244Pu in Ancient Zircons

@article{Turner2004Extinct2I,
  title={Extinct 244Pu in Ancient Zircons},
  author={Grenville Turner and T. Mark Harrison and Greg Holland and Stephen J. Mojzsis and Jamie D. Gilmour},
  journal={Science},
  year={2004},
  volume={306},
  pages={89 - 91}
}
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… 
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The iodine–plutonium–xenon age of the Moon–Earth system revisited
  • G. Avice, B. Marty
  • Environmental Science, Geology
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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Iodine–plutonium–xenon isotope systematics have been used to re-evaluate time constraints on the early evolution of the Earth–atmosphere system and, by inference, on the Moon-forming event. Two
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