Helium isotopes in South Pacific deep seawater.

• 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

• Gamo Toshitaka

  Ocean Research Institute, The University of Tokyo

Abstract

We have measured ³He/⁴He and ⁴He/²⁰Ne ratios and ⁴He 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 ³He/⁴He and ⁴He/²⁰Ne ratios vary significantly from 0.988 R_atm to 1.276 R_atm and from 0.254 to 0.292, respectively. An extensive plume of water enriched in ³He has been discovered at a depth of about 2000 meter. Taking ³He/⁴He data of the Geosecs and the South Tow expeditions, 25% excess ³He plume can be traced over 5000 kilometers to the west of the East Pacific Rise. Observed 25% excess ³He 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

  GEOCHEMICAL SOCIETY OF JAPAN

Keywords

• Geochemistry and Petrology
• Geophysics

Details

• CRID: 1390282679526571136
• NII Article ID: 10008800362
• NII Book ID: AA00654975
• DOI: 10.2343/geochemj.29.377
• ISSN: 18805973
• ISSN: 00167002
• Web Site: http://www.jstage.jst.go.jp/article/geochemj1966/29/6/29_6_377/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed