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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Helium isotopes in South Pacific deep seawater

Yuji Sano, Naoto Takahata, Toshitaka Gamo
Geochemical Journal, Vol. 29, No. 6, P. 377-384, 1995


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 Ratm to 1.276 Ratm 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.

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