地球史ノート : 『地球の年齢について』  [in Japanese] Note on the Age of the Earth  [in Japanese]

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Abstract

<i>Age of the Earth</i> is still enigma. A major confusion stems from ambiguity in defining what is meant by <i>Age of the Earth</i>. The term could be assigned to any event that would characterize the time when the Earth established itself as an independent planet in the solar system. The latter includes the time when the Earth attained a size close to the present one or the completion of the core-mantle segregation. U-Pb systematics on mantle-derived materials (MORB, OIB) suggests that the latter event occurred about 80 Ma after CAI or the formation of the solar nebula. I-Pu-Xe systematics is more likely to signify the time when the Earth became a closed system with respect to Xe. The latter may be assigned to the time when the Earth reached a size comparable to the Mars or slightly smaller one.

Journal

  • Chikyukagaku

    Chikyukagaku 35(3), 139-149, 2001

    The Geochemical Society of Japan

References:  33

Codes

  • NII Article ID (NAID)
    110008680022
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0386-4073
  • NDL Article ID
    5888138
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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