Trapped noble gas components and exposure history of the enstatite chondrite ALH84206

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Noble gases in the Allan Hills (ALH) 84206 EH3 chondrite were measured with stepwise heating of a large sample (98.9 mg) and with total extraction of small samples (0.9-2.3 mg). Light noble gases show solar and cosmogenic components. The elemental ratios of solar gases in the samples suggest no significant loss of solar <sup>36</sup>Ar. Some of small samples are richer in cosmogenic <sup>21</sup>Ne than the large sample. Assuming that the excesses are due to a parent body exposure to cosmic rays, we obtain a parent body exposure age longer than 51 Ma and a meteoroid exposure age shorter than 39 Ma. Heavy noble gases are dominated by elementally fractionated Q-gases and atmospheric noble gases. The presence of fractionated Q-gases combined with no loss of solar <sup>36</sup>Ar suggests that solar wind exposure occurred after Q-gas fractionation. Kr isotopic ratios show the presence of neutron-induced <sup>80</sup>Kr and <sup>82</sup>Kr from Br. The minimum radius of the ALH84206 meteoroid was calculated as 27 cm from the abundances of neutron-induced Kr, assuming that these were produced during exposure of the meteoroid.

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  • Geochemical journal : journal of the Geochemical Society of Japan  

    Geochemical journal : journal of the Geochemical Society of Japan 40(6), 543-555, 2006-12-01 

    GEOCHEMICAL SOCIETY OF JAPAN

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各種コード

  • NII論文ID(NAID)
    10018466754
  • NII書誌ID(NCID)
    AA00654975
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00167002
  • NDL 記事登録ID
    8598198
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z53-R488
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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