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Elucidation of source and flux of methane in marine environments

Research Project

Project/Area Number 11308020
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionHOKKAIDO UNIVERSITY (2000-2001)
The University of Tokyo (1999)

Principal Investigator

GAMO Toshitaka  Hokkaido Univ., Grad. School of Sci., Prof., 大学院・理学研究科, 教授 (70143550)

Co-Investigator(Kenkyū-buntansha) MATSUMOTO Ryo  Univ. Tokyo, Grad. School of Sci., Prof., 大学院・理学系研究科, 教授 (40011762)
TSUNOGAI Urumu  Hokkaido Univ., Grad. School of Sci., Assoc., Prof., 大学院・理学研究科, 助教授 (50313367)
OKADA Hisatake  Hokkaido Univ., Grad. School of Sci., Prof., 大学院・理学研究科, 教授 (80111334)
ISHIBASHI Junichiro  Kyushu Univ., Grad. School of Sci., Assoc. Prof., 大学院・理学研究院, 助教授 (20212920)
YOSHIDA Naohiro  Tokyo Inst. Tech., Grad. School of Sci., Engineer., Prof., 大学院・総合理工学研究科, 教授 (60174942)
野崎 義行  東京大学, 海洋研究所, 教授 (70126142)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥41,380,000 (Direct Cost: ¥40,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2001: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥35,800,000 (Direct Cost: ¥35,800,000)
KeywordsSubmarine hydrothermal activity / Submarine cold seepage / Methane / Carbon isotope ratio / Microbiological activity / Plate boundaries / Gas hydrate / Continuous flow mass spectrometry / 海底熱水系 / 沖縄トラフ / 日本海東縁 / 南海トラフ / 炭素同位体比 / 海底熱水活動 / マリアナトラフ / 水曜海山 / 海形海山 / アデン湾 / 地下生物圏 / メタンガス / 付加体堆積物 / 間隙水 / 硫酸還元
Research Abstract

This study aimed at elucidating the behavior of methane in the oceanic environment, especially in oceanic waters and pore fluids in sedimentary layers. Concentration and stable carbon isotope ratios (^<13>C/^<12>C) of methane were precisely measured by using an isotope-ratio-monitoring gas chromatography/mass spectrometry system newly constructed in this study. Submarine hydrothermally active areas at spreading centers and arc volcanoes (Central Indian Ridge, Gulf of Aden, Mariana Trough, Okinawa Trough, Suiyo Seamount etc.) and cold seepage areas at plate subduction zones (Nankai Trough, Eastern Japan Sea etc.) were investigated in detail using research vessels and submersibles, in order to take fluid samples for methane analysis from these areas. The carbon isotope ratio of methane has enabled us to distinguish the following three different types of methane: magmatic methane, methane from thermocatalytic decomposition of organic matter, and biogenic methane. In addition, oxidative decomposition of methane was recognized in pore fluids as well as in seawater, by detecting the enrichment of ^<13>C of methane to occur during microbiological processes. Gas hydrate below seafloor was also discussed as an important source of methane from the sediment to seawater.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (33 results)

All Other

All Publications (33 results)

  • [Publications] U.Tsunogai et al.: "Carbon isotopic distribution of methane in deep-sen hydrothermal plume, Myojin Knoll caldera, Izu-Bonin arc : Implications for microbial"Geochim. Cosmochim, Acta. 64. 2439-2452 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Okada: "Neogene and Quaternary Calcareous nannofossils from the Blake Ridge, Site 994.995 and 997"Proc. ODP. Sci. Results. 164. 331-341 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R.Matsumoto et al.: "Occurrence, Structure and composition of natural gas hydrotes recovered from the Blake Ridge, ODP 164,Northwest Atlantic"Proc. ODP. Sci. Results. 164. 13-28 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Gamo et al.: "Chemical characteristics of newly discovered black-smoker fluids and associated hydrothermal plumes at Rodriguez Triple Junction"Earth Planet. Sci. Lett.. 193. 371-379 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 土岐 知弘 ほか: "南海トラフ付加体内部から表層堆積物へのメタン供給"地質調査所月報. 52. 1-8 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] U.Tsunogai et al.: "Carbon isotope evidence of methane oxidation through surfate reduction in sediment beneath cold seep vents on the seafloor at Nankai"Mar. Geol.. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 池田 元美ほか編: "海と環境-海が変わると地球が変わる"講談社サイエンティフィク. 244 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] U. Tsunogai, N. Yoshida, J. Ishibashi, T. Gamo: "Carbon isotopic distribution of methane in deep-sea hydrothermal plume, Myojin KnoII caldera, Izu-Bonin arc: Implications for microbial methane oxidation in ocean and applications to heat flux estimation"Geochim. Cosmochim. Acta.. 64(14). 2439-2452 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Okada: "Neogene and Quaternary calcareous nannofossils from the Blake Ridge, Sites 994, 995 and 997."Proc. ODP. Sci. Results. 164. 331-341 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Matsumoto, T. Uchida, et al.: "Occurrence, structure and composition of natural gas hydrates recovered from the Blake Ridge, ODP Leg 164, Northwest Atlantic"ODP Sci. Results. TX (Oceaqn Drilling Program) Vol. 164, College Station. 13-28 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Gamo, H. Chiba, T. Yamanaka, T. Okuclaira, J. Hashimoto, S. Tsuchida, J. Ishibashi, S. Kataoka, U. Tsunogai, K. Okamura, Y. Sano, R. Shinjyo: "Chemical characteristics of newly discovered black-smoker fluids and associated hydrothermal plumes at the Rodriguez Triple Junction, Central Indian Ridge"Earth Planet. Sci. Lett.. 193. 371-379 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Toki, T. Gamo, T. Yamanaka, J. Ishibashi, U. Tsunogai, 0. Matsubayashi: "Methane migration from the Nankai Trough accretionary prism. (in Japanese with English abstract)"Bull. Geol. Surv. Japan. 52. 1-8 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] U. Tsunogai, N. Yoshida, T. Gamo: "Carbon isotopic evidence of methane oxidation through sulfate reduction in sediment beneath cold seep vents on the sea floor at Nankai Trough"Mar. Geol.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Ikeda, T. Oba, T. Gamo, S. Uye (Oceanogr. Soc. Japan) eds.: "The Sea and the Environment - The Earth changes as the Sea changes"Kodansha Scientific, Tokyo. 244 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Toshitaka Gamo et al.: "Chemical charactersitics of newly discovered black-smoker fluids and associated hydrothermal plumes at the Rodriguez Triple Junction, Central Indian Ridge"Earth and Planetary Science Letters. 193. 371-379 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Urumu Tsunogai et al.: "Carbon isotopic evidense of methane oxidation through sulfate reduction in sediment beneath cold seep vents on the seafloor at Nankai Trough"Marine Geology. In press.

    • Related Report
      2001 Annual Research Report
  • [Publications] Kei Okamura et al.: "Development of a deep-sea in situ Mn analyzer and its application for hydrotherma plume observation"Marine Chemistry. 76. 17-26 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Kantaro Fujioka et al.: "An introduction to serpentinite biosphere in the Mariana forearc ----- Capsule of the deep subsurface biosphere from the Chamorro Seamount ----"Bulletin of the Earthquake Research Institute, University of Tokyo. 76. 417-424 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Junichiro Ishibashi et al.: "Helium and carbon gas geochemistry of pore fluid from sediment-rich hydrothermal system in Escanaba Trough"Applied Geochemistry. In press.

    • Related Report
      2001 Annual Research Report
  • [Publications] 土岐知弘ほか: "南海トラフ付加体内部から表層堆積物へのメタンの供給"地質調査所月報. 52. 1-8 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 池田元美ほか(共同編集): "海と環境(海が変わると地球が変わる)"講談社サイエンティフィク. 244 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 蒲生 俊敬: "日本海の底層に無酸素化する?"科学. 70・5. 376-380 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] U.Tsunogai et al.: "Carbon isotopic distribution of methane in deep-sea hydrothermal plume, Myojin knoll ealdera, Jzu-Bonin arc."Geochim. Cosmochim. Acta. 64・14. 2439-2452 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] U.Tsunogai et al.: "Carbon isotopic evidence of methane oxidation through sulfate reduction in sediments beneath cold seep vents at Nankai Traugh."Mar.Geol.. (in press).

    • Related Report
      2000 Annual Research Report
  • [Publications] R.Matsumoto et al.: "Occurrence, structure and composition of natural gas hydrates recovered from the Blake Ridge, ODP Leg 164, Northwest Atlantic."ODP,Sci.Results. 164. 13-28 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Yoshida et al.: "Isotopomer analysis of methane and nitrous oxide for the study of their geochemical cycles."Proc, 2-nd Internat. Symp. on Non-Co_2 greenhouse gases. 185-188 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Yamanaka et al.: "Organic geochemistry of hydrothermal petroleum generated in the submarine Wakamiko caldera, southern Kyushu, Japan"Org.Geochem.. 31. 1117-1132 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 蒲生俊敬: "深海底から地球深部を探る-南海トラフにおけるメタンガスの湧出現象"石油技術協会誌. 64・2. 173-183 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T. Gamo: "Global warming may have slowed down the deep conveyor belt of a marginal sea of the northwestern Pacific : Japan Sea"Geophys. Res. Lett.. 26. 3141-3144 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] U. Tsunogai, N. Yoshida, T. Gamo: "Carbon isotopic evidence of methane oxidation through sulfate reduction in sediment beneath cold seep vents on the seaflow at Nankai Trough"Mar. Geol.. (in press).

    • Related Report
      1999 Annual Research Report
  • [Publications] U. Tsunogai, N. Yoshida, J. Ishibashi, T. Gamo: "Carbon isotope distribution of methane in deep sea hydrothermal plume, Myojin Knoll Caldera, Izu-Bonin Arc"Geochim. Cosmochim. Acta. (in press).

    • Related Report
      1999 Annual Research Report
  • [Publications] R. Matsumoto et al.: "Occurrence, structure and composition of natural gas hydrates recovered from the Blake Ridge, ODP Leg164, Northwest Atlantic"Proc. ODP Sci. Results. 164. 268-281 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] H. Okada: "Neogene and Quaternary calcareous nannofossils from the Blake Ridge Sites 994,995,and 997"Proc. ODP Sci. Results. 164. (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2019-02-28  

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