Isotopic anomalies of rare gases in the Nigorikawa geothermal area, Hokkaido, Japan

Details Isotopic anomalies of rare gases in the Nigorikawa geothermal area, Hokkaido, Japan Isotopic anomalies of rare gases in the Nigorikawa geothermal area, Hokkaido, Japan

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..44...82n&link_type=abstract

Earth and Planetary Science Letters, vol. 44, no. 1, July 1979, p. 82-90.

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4

Geothermal Resources, Japan, Rare Gases, Abundance, Argon, Chemical Fractionation, Energy Sources, Energy Technology, Helium, Neon

Scientific paper

Anomalous isotopic compositions of rare gases were determined for gas samples enriched in CO2 collected in the Nigorikawa geothermal area, Hokkaido, Japan. A high isotopic ratio of 3He/4He=(9.95 plus or minus 0.25) times 10 to the minus 6th power was obtained for a sample collected from bubbles seeping out of a cold water pond in an abandoned sulfur mine. The sample had a rare gas elemental abundance pattern attributable to low-temperature solubility of atmospheric rare gases in water, and soil gas samples indicate mass fractionation of atmospheric rare gases, in addition to the originally high 3He/4He ratio. The highest 20Ne/22Ne ratio was associated with the highest 36Ar/38Ar ratio, and a systematic enrichment of the light isotopes of Kr and Xe. The enrichment of the light isotopes in gas and soil gas samples was accompanied by a systematic enrichment of the light gases, and migration of rare gas in the crust is responsible for this isotopic and elemental fractionation.

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