Helium isotopes in South Pacific deep seawater

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Author(s)

    • SANO Yuji
    • Department of Earth and Planetary Sciences, Faculty of Science, Hiroshima University
    • TAKAHATA Naoto
    • Department of Earth and Planetary Sciences, Faculty of Science, Hiroshima University

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 19 South Pacific water samples with various depths from station SA-6 located in the Solomon Sea (6°38'S, 153°38'E) and SA-7 in the central Coral Sea Basin (14°16'S, 154°19'E) on the KH-92-4 cruise of the Research Vessel, Hakuho Maru of the University of Tokyo. The <sup>3</sup>He/<sup>4</sup>He and <sup>4</sup>He/<sup>20</sup>Ne ratios vary significantly from 0.988 <i>R</i><sub>atm</sub> to 1.276 <i>R</i><sub>atm</sub> and from 0.254 to 0.292, respectively. An extensive plume of water enriched in <sup>3</sup>He has been discovered at a depth of about 2000 meter. Taking <sup>3</sup>He/<sup>4</sup>He data of the Geosecs and the South Tow expeditions, 25% excess <sup>3</sup>He plume can be traced over 5000 kilometers to the west of the East Pacific Rise. Observed 25% excess <sup>3</sup>He plume at SA-6 and 7 may be independent from the ridge, which suggests that there is another source of the mantle derived helium in the area studied.

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 29(6), 377-384, 1995-12-01

    GEOCHEMICAL SOCIETY OF JAPAN

References:  32

Cited by:  2

Codes

  • NII Article ID (NAID)
    10008800362
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00167002
  • Data Source
    CJP  CJPref  J-STAGE 
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