超微量の炭素同位体比測定による海底熱水・冷湧水溶存気体に関する研究 Stable carbon isotopic studies of volatile components in seafloor venting hydrothermal and cold seep fluids, using CF-IRMS

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著者

    • 角皆 潤 TSUNOGAI Urumu
    • 北海道大学大学院理学研究科地域惑星科学専攻 Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University

抄録

This paper summarizes stable carbon isotopic studies of hydrocarbons, especially methane, in seafloor venting hydrothermal and cold seep fluids, and their effluent methane-enriched plume in water column. Through highly sensitive isotopic analysis using CF-IRMS, we have discussed origin and/or behavior of hydrocarbons in each system. Major results are as follows: (i) methane in cold seep fluids around Japanese islands mostly microbial origin, (ii) methane emitted from cold seep fluids mostly oxidized anaerobically within sediments just before they emitted into ocean, (iii) methane in hydrothermal plume oxidized aerobically in some extent in the water column. Besides, methane flux and heat flux can be calculated for a methane-enriched fluid venting area from δ13C distribution of methane in hydrothermal plume, by using kinetic isotope fractionation which occurs during partial destruction. Similar approach could be also applicable to study origin and behavior of reactive trace components in atmosphere, such as non-methane hydrocarbons and CO. Preliminary results of such studies are also presented.

This paper summarizes stable carbon isotopic studies of hydrocarbons, especially methane, in seafloor venting hydrothermal and cold seep fluids, and their effluent methane-enriched plume in water column. Through highly sensitive isotopic analysis using CF-IRMS, we have discussed origin and/or behavior of hydrocarbons in each system. Major results are as follows: (i) methane in cold seep fluids around Japanese islands mostly microbial origin, (ii) methane emitted from cold seep fluids mostly oxidized anaerobically within sediments just before they emitted into ocean, (iii) methane in hydrothermal plume oxidized aerobically in some extent in the water column. Besides, methane flux and heat flux can be calculated for a methane-enriched fluid venting area from δ<sup>13</sup>C distribution of methane in hydrothermal plume, by using kinetic isotope fractionation which occurs during partial destruction of methane in water column as an indicator to estimate magnitude of the partial destruction. Similar approach could be also applicable to study origin and behavior of reactive trace components in atmosphere, such as nonmethane hydrocarbons and CO. Preliminary results of such studies are also presented.

収録刊行物

  • 地球化学

    地球化学 36(1), 51-63, 2002

    日本地球化学会

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各種コード

  • NII論文ID(NAID)
    110008680033
  • NII書誌ID(NCID)
    AN00141280
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03864073
  • NDL 記事登録ID
    6097356
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-645
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  IR  J-STAGE 
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