...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Philosophical transactions of the Royal Society. Mathematical, physical, and engineering sciences >The iodine-plutonium-xenon age of the Moon-Earth system revisited
【24h】

The iodine-plutonium-xenon age of the Moon-Earth system revisited

机译：重新审视月地球系统的碘x氙年龄

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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 extinct radionuclides (~(129)I, T_(1/2) =15.6Ma and ~(244)Pu, T_(1/2) =80 Ma) have produced radiogenic 129Xe and fissiogenic ~(131-136)Xe, respectively, within the Earth, the related isotope fingerprints of which are seen in the compositions of mantle and atmospheric Xe. Recent studies of Archaean rocks suggest that xenon atoms have been lost from the Earth's atmosphere and isotopically fractionated during long periods of geological time, until at least the end of the Archaean eon. Here, we build a model that takes into account these results. Correction for Xe loss permits the computation of new closure ages for the Earth's atmosphere that are in agreement with those computed for mantle Xe. The corrected Xe formation interval for the Earth-atmosphere system is 40_(-10)~(+20) Ma after the beginning of Solar System formation. This time interval may represent a lower limit for the age of the Moon-forming impact.
机译：碘-lu-氙同位素系统已用于重新评估地球-大气系统早期演化以及推断月球形成事件的时间限制。两种已灭绝的放射性核素（〜（129）I，T_（1/2）= 15.6Ma和〜（244）Pu，T_（1/2）= 80 Ma）已产生放射源129Xe和裂变的〜（131-136）Xe，分别在地球内部，在地幔和大气Xe的组成中可以看到其相关的同位素指纹。最近对古生岩石的研究表明，氙气原子已从地球大气层中消失，并在很长的地质时期（至少到古细菌时代结束）同位素同位素化了。在这里，我们建立一个考虑这些结果的模型。对Xe损失的修正允许计算地球大气层的新封闭年龄，该年龄与为Xe地幔计算的封闭年龄一致。太阳系开始形成后，地球大气系统的校正Xe形成间隔为40 _（-10）〜（+20）Ma。此时间间隔可能代表着形成月球撞击的年龄的下限。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号