Mantle helium flux from the bottom of Lake Mashu, Japan

G. Igarashi, M. Ozima, J. Ishibashi, T. Gamo, H. Sakai, Y. Nojiri, T. Kawai

研究成果: ジャーナルへの寄稿学術誌査読

18 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)11-18
ページ数8
ジャーナルEarth and Planetary Science Letters
108
1-3
DOI
出版ステータス出版済み - 1月 1992
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地球化学および岩石学
  • 地球惑星科学(その他)
  • 宇宙惑星科学

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