<sup>244</sup>Pu年代法の可能性と問題点  [in Japanese] <sup>244</sup>Pu chronology-its possibility and problems  [in Japanese]

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Abstract

Although more than 20 years have passed since the discovery of the debris of <sup>244</sup>Pu in meteorites, its application to chronology is not yet fully established. In this paper, several problems involved in <sup>244</sup>Pu chronology are discussed in conjunction with those for <sup>129</sup>I chronology and the possibility of <sup>244</sup>Pu chronology is sought. The most serious problem for <sup>244</sup>Pu chronology is the lack of a reference nuclide for <sup>244</sup>Pu. Although an ideal nuclide for a reference of <sup>244</sup>Pu is not available, however, individual candidates for a reference element are proposed for several specific samples, e.g., uranium or rare earth elements (REE's) for bulk chondrite samples and light REE's for the acid-residual fraction of the most primitive ordinary chondrites. Using the literature values of <sup>244</sup>Pu/<sup>238</sup>U and the nucleosynthesis model by Fowler (1987), formation intervals are calculated for several meteorite specimens. There appears to be an apparent discrepancy in calculated ages between <sup>244</sup>Pu and <sup>129</sup>I chronologies; formation intervals based on <sup>244</sup>Pu are about double those from <sup>129</sup>I chronology, suggesting that a considerable fraction of <sup>129</sup>I was later added to the solar nebula after the end of nucleosynthesis responsible for <sup>244</sup>Pu and almost all other nuclides.

Journal

  • Chikyukagaku

    Chikyukagaku 27(2), 83-95, 1993

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    110008679878
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    3848080
  • NDL Source Classification
    ME51;PA42
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    NDL  NII-ELS  J-STAGE 
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