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Noble-gas-rich chondrules in an enstatite meteorite

Author

Listed:
  • Ryuji Okazaki

    (Faculty of Sciences, Kyushu University 33
    University of Tokyo)

  • Nobuo Takaoka

    (Faculty of Sciences, Kyushu University 33)

  • Keisuke Nagao

    (Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo)

  • Minoru Sekiya

    (Faculty of Sciences, Kyushu University 33)

  • Tomoki Nakamura

    (Faculty of Sciences, Kyushu University 33)

Abstract

Chondrules are silicate spherules that are found in abundance in the most primitive class of meteorites, the chondrites. Chondrules are believed to have formed by rapid cooling of silicate melt early in the history of the Solar System1, and their properties should reflect the composition of (and physical conditions in) the solar nebula at the time when the Sun and planets were forming. It is usually believed that chondrules lost all their noble gases at the time of melting2,3,4. Here we report the discovery of significant amounts of trapped noble gases in chondrules in the enstatite chondrite Yamato-791790, which consists of highly reduced minerals. The elemental ratios 36Ar/132Xe and 84Kr/132Xe are similar to those of ‘subsolar’ gas5,6, which has the highest 36Ar/132Xe ratio after that of solar-type noble gases7. The most plausible explanation for the high noble-gas concentration and the characteristic elemental ratios is that solar gases were implanted into the chondrule precursor material, followed by incomplete loss of the implanted gases through diffusion over time.

Suggested Citation

  • Ryuji Okazaki & Nobuo Takaoka & Keisuke Nagao & Minoru Sekiya & Tomoki Nakamura, 2001. "Noble-gas-rich chondrules in an enstatite meteorite," Nature, Nature, vol. 412(6849), pages 795-798, August.
    • Handle: RePEc:nat:nature:v:412:y:2001:i:6849:d:10.1038_35090520
    DOI: 10.1038/35090520
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