Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.108...11i&link_type=abstract
Earth and Planetary Science Letters, Volume 108, Issue 1-3, p. 11-18.
Other
4
Scientific paper
Most of the 52 water samples from Lake Mashu, Hokkaido, Japan show large anomalies in their 3He/4He ratios (up to 4.6 times the atmospheric ratio) and 4He/20Ne ratios, indicating continuous injection of mantle He due to hot spring activity at the lake bottom. The 3He/4He ratio of the injected mantle He is estimated at 3He/4He = 9.43 +/- 0.17 × 10-6, which is close to the highest value reported for volcanic gases from the Japanese Islands. Accumulation of mantle He in the near-bottom water can be reasonably explained by a diffusion process with a constant He flux from the lake bottom of f4He = 9.2 × 107 atoms/cm2/s and f3He = 8.7 × 102 atoms/cm2/s. The heat/3He ratio (1.7 × 10-7 J/atom) falls in the range of values reported for submarine hydrothermal systems (0.4-26 × 10-7 J/atom), whereas the C/3He ratio (1.8 × 1011) is about two orders of magnitude higher than the MORB average (2 × 109). The mantle He injected from the lake bottom has a fairly short mean residence time in the lake water, and is estimated at about 2-4 years. Overturn of the lake water, which occurs twice a year, probably plays an important role in the rapid transportation of the mantle He from the bottom to the surface.
Gamo Toshitaka
Igarashi George
Ishibashi Junichiro
Kawai Takahiro
Nojiri Yukihiro
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