日本海海水中のヘリウム同位体比  [in Japanese] Helium isotope ratios in Japan Sea water  [in Japanese]

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Author(s)

    • 佐野 有司 [他] SANO Yuji
    • 東京大学理学部付属地殻化学実験施設 Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo
    • 脇田 宏 WAKITA Hiroshi
    • 東京大学理学部付属地殻化学実験施設 Laboratory for Earthquake Chemistry, Faculty of Science, The University of Tokyo
    • 石橋 純一郎 ISHIBASHI Jun-ichiro
    • 東京大学海洋研究所海洋無機化学部門:(現)東京大学理学部付属地殻化学実験施設 Division of Marine Inorganic Chemistry, Ocean Research Institute, The University of Tokyo
    • 蒲生 俊敬 GAMO Toshitaka
    • 東京大学海洋研究所海洋無機化学部門 Division of Marine Inorganic Chemistry, Ocean Research Institute, The University of Tokyo
    • 酒井 均 SAKAI Hitoshi
    • 東京大学海洋研究所海洋無機化学部門 Division of Marine Inorganic Chemistry, Ocean Research Institute, The University of Tokyo

Abstract

We have measured <sup>3</sup>He/<sup>4</sup>He and <sup>4</sup>He/<sup>20</sup>Ne ratios, and <sup>4</sup>He concentrations in water samples collected at several depths in the eastern Japan Sea. Observed <sup>3</sup>He/<sup>4</sup>He and <sup>4</sup>He/<sup>20</sup>Ne ratios vary from 1.006R<sub>atm</sub> (where R<sub>atm</sub> is atmospheric ratio of 1.343×10<sup>-6</sup>) to 1.045 R<sub>atm</sub> and from 0.24 to 0.31, respectively. There is a difference in <sup>4</sup>He concentration between in the samples shallower than 1,500m and those deeper than 2,000m. The discrepancy may be related to the existence of two water masses in the Japan Sea suggested by Gamo and Horibe (1983). Excess <sup>3</sup>He in the shallower samples is attributable to tritium decay in the sea water while that in the deeper samples is not. Emanation of mantle helium is suggested in the Japan Sea bottom. Since the number of present data is small, extensive <sup>3</sup>He/<sup>4</sup>He research should be carried out in future to verify the existence of mantle helium in the Jpan Sea.

Journal

  • Chikyukagaku

    Chikyukagaku 23(2), 61-67, 1989

    The Geochemical Society of Japan

Cited by:  1

Codes

  • NII Article ID (NAID)
    110008679830
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    3649685
  • NDL Source Classification
    ME32(水文学--海洋)
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE 
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