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Isotopic enhancements of ~(17)O and ~(18)O from solar wind particles in the lunar regolith

机译:月球巨石中太阳风粒子对〜(17)O和〜(18)O的同位素增强作用

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摘要

Differences in isotopic abundances between meteorites and rocks on Earth leave unclear the true composition of the gas out of which the Solar System formed. The Sun should have preserved in its outer layers the original composition, and recent work has indicated that the solar wind is enriched in ~(16)O, relative to Earth, Mars and bulk meteorites. This suggests that self-shielding of CO due to photo-dissociation, which is a well understood process in molecular clouds, also led to evolution in the isotopic abundances in the early Solar System. Here we report measurements of oxygen isotopic abundances in lunar grains that were recently exposed to the solar wind. We find that ~(16)O is under-abundant, opposite to an earlier finding based on studies of ancient metal grains. Our result, however, is more difficult to understand within the context of current models, because there is no clear way to make ~(16)O more abundant in Solar System rocks than in the Sun.
机译:地球上陨石和岩石之间同位素丰度的差异尚不清楚太阳系所形成的气体的真实组成。太阳应该在其外层保留其原始成分,并且最近的工作表明,相对于地球,火星和大块陨石,太阳风富含〜(16)O。这表明由于光解离而导致的CO自屏蔽(这是分子云中一个众所周知的过程),也导致了早期太阳系中同位素丰度的演化。在这里,我们报告了最近暴露于太阳风的月粒中氧同位素丰度的测量值。我们发现〜(16)O含量不足,这与基于古代金属晶粒研究的早期发现相反。但是,在当前模型的背景下,我们的结果更难于理解,因为没有明确的方法可以使太阳系岩石中的〜(16)O比太阳中的丰富。

著录项

  • 来源
    《Nature》 |2006年第7085期|p.776-778|共3页
  • 作者单位

    Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory 0200, 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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