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Tungsten isotope evidence from ~3.8-Gyr metamorphosed sediments for early meteorite bombardment of the Earth

机译:〜3.8-Gyr变质沉积物中的钨同位素证据证明了地球早期陨石的轰击

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摘要

The 'Late Heavy Bombardment' was a phase in the impact history of the Moon that occurred 3.8-4.0 Gyr ago, when the lunar basins with known dates were formed. But no record of this event has yet been reported from the few surviving rocks of this age on the Earth. Here we report tungsten isotope anomalies, based on the ~(182)Hf-~(182)W system (half-life of 9 Myr), in metamorphosed sedimentary rocks from the 3.7-3.8-Gyr-old Isua greenstone belt of West Greenland and closely related rocks from northern Labrador, Canada. As it is difficult to conceive of a mechanism by which tungstenisotope heterogeneities could have been preserved in the Earth's dynamic crust-mantle environment from a time when short-lived ~(182)Hf was still present, we conclude that the metamorphosed sediments contain a component derived from meteorites.
机译:“重磅炸弹袭击”是月球撞击历史的一个阶段,发生在3.8-4.0 Gyr年前,当时形成了已知日期的月球盆地。但是,至今还没有关于地球上少数现存岩石的报道。在这里,我们报告了基于〜(182)Hf-〜(182)W系统(半衰期为9 Myr)的钨同位素异常,该异常发生在西格陵兰岛3.7-3.8-Gyr老Isua绿岩带的变质沉积岩中和来自加拿大拉布拉多北部的紧密相关的岩石。由于很难想象从短时〜(182)Hf仍然存在的时间起就可以在地球的动态地幔幔环境中保留钨同位素异质性的机制,因此我们得出结论,变质沉积物包含一种组分来自陨石。

著录项

  • 来源
    《Nature》 |2002年第6896期|p.403-405|共3页
  • 作者单位

    Advanced Centre for Queensland University Research Excellence (ACQUIRE), The University of Queensland, St Lucia, Queensland 4072, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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