Peculiar features of Suiyo Seamount hydrothermal fluids, Izu-Bonin Arc: Differences from subaerial volcanism

U. Tsunogai, J. Ishibashi, H. Wakita, T. Gamo, K. Watanabe, T. Kajimura, S. Kanayama, H. Sakai

研究成果: ジャーナルへの寄稿学術誌査読

93 被引用数 (Scopus)

抄録

This is the first report of the dissolved gas composition of a deep-sea venting hydrothermal system originating from arc volcanism; the origin of dissolved gases in hydrothermal fluids from the Suiyo seamount in the southern Izu-Bonin (Ogasawara) Arc is discussed on the basis of chemical and isotopic compositions. Twelve high-temperature (up to 310°C) fluid samples were collected from three vents of the hydrothermal system using the submersible Shinkai 2000. The average 3He 4He ratio of the dissolved He is 8.1 ( R Ratm), which is within the range of values reported for N-MORB. The CO2 3He ratio is 12 × 109, which is within the range of arc volcanic gas values. The δ13C values of CO2 and CH4 are -1 and -8.5‰ respectively, which is quite high compared with other subaerial arc volcanic gases and those from mid-ocean ridges. These results, which do not accord with those from subaerial volcanism, are unlikely to result from fractionation or addition of carbon sources during the fluid circulation, but are regarded as characteristic of the magma source of Suiyo Seamount. A simple mixing of 97% MORB mantle with 3% subducting slab explains well the composition of the helium and carbon in the parent magma.

本文言語英語
ページ(範囲)289-301
ページ数13
ジャーナルEarth and Planetary Science Letters
126
4
DOI
出版ステータス出版済み - 9月 1994
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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