Do microcrystalline dolomite inclusions provide fossil evidence for the onset of gas hydrate formation?: Isotopic and biogeochemical investigations of methane hydrate in Joetsu Basin, Sea of Japan.

2019 年度 実績報告書

• 研究課題/領域番号: 17K05712
• 研究機関: 明治大学
• 研究代表者: Snyder Glen 明治大学, 研究・知財戦略機構(駿河台), 研究推進員 (90751777)
• 研究分担者: 鈴木 庸平 東京大学, 大学院理学系研究科(理学部), 准教授 (00359168) ; 松本 良 明治大学, 研究・知財戦略機構(駿河台), 特任教授 (40011762) ; 佐野 有司 東京大学, 大気海洋研究所, 教授 (50162524) ; 戸丸 仁 千葉大学, 大学院理学研究院, 准教授 (80588244)
• 研究期間 (年度): 2017-04-01 – 2020-03-31
• キーワード: microdolomite / Bacteriodetes / gas hydrate / Sea of Japan / Joetsu Basin

研究実績の概要

The presence of microbial life within the microdolomite samples was confirmed through mRNA analyses. We found that Bacteriodetes which break down oils are the predominant form of life inside of the microdolomites. This is quite different from anaerobic methane oxidizing Archea and sulfate reducing bacteria which have been found to be predominant in the outer surfaces of gas hydrate in shallow sediments, and our work shows that the environment which hosts within the hydrate is quite distinct, presumably due to the absence of sulfate and the high chloride content within methane hydrate inclusions. We also carried out nanoSIMS analyses to characterize the organic matter inside of the microdolomites which will be the focus of ongoing research.

研究成果

• [国際共同研究] School of Geosciences/University of Aberdeen/Scotland U.K. (Stephen Bowden)(英国)
  • 国名: 英国
  • 外国機関名: School of Geosciences/University of Aberdeen/Scotland U.K. (Stephen Bowden)
• [雑誌論文] Magmatic fluids play a role in the development of active gas chimneys and massive gas hydrates in the Japan Sea. (2020)
  • 著者名/発表者名: Snyder, G. T. , Sano, Y., Takahata, N., Matsumoto, R., Kakizaki, Y. and Tomaru, H.,
  • 雑誌名: Chemical Geology 巻: 535 ページ: 119462
  • DOI: https://doi.org/10.1016/j.chemgeo.2020.119462
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes (2020)
  • 著者名/発表者名: Snyder, G.T., Matsumoto, R., Suzuki, Y., Kouduka, M., Kakizaki, Y., Zhang, N., Tomaru,H., Sano, Y.,, Takahata, N., Tanaka, K., Bowden, S.A., Imajo, T.
  • 雑誌名: Scientific Reports 巻: 10 ページ: 1-13
  • DOI: https://doi.org/10.1038/s41598-020-58723-y
  • 査読あり / オープンアクセス / 国際共著
• [雑誌論文] Clumped isotope signatures of methane-derived authigenic carbonate presenting equilibrium values of their formation temperatures (2019)
  • 著者名/発表者名: Zhang, N., Lin, M., Snyder, G.T., Kakizaki, Y., Yamada, K., Yoshida, N., Matsumoto, R.
  • 雑誌名: Earth and Planetary Science Letters 巻: 512 ページ: 207-213
  • DOI: https://doi.org/10.1016/j.epsl.2019.02.005
  • 査読あり / 国際共著
• [学会発表] Microdolmite grains in Japan Sea Gas Hydrate: What do they tell us about present and past hydrate growth? (2019)
  • 著者名/発表者名: G.Snyder, R.Matsumoto, Y. Kakizaki, Y. Suzuki, N.Zhang, Y.Sano, N. Takahata, K. Tanaka, T. Imajo, S. Bowden, H. Tomaru
  • 学会等名: Pacific Conference of Marine Science and Technology (PACON), Vladivostok, Russia
  • 国際学会
• [学会発表] Microdolomites are not MDACs: microbially-derived carbon source for microcrystalline dolomite found within massive gas hydrates and implications for the shallow marine carbon cycle (2019)
  • 著者名/発表者名: G.Snyder, R.Matsumoto, Y. Kakizaki, Y. Suzuki, N.Zhang, Y.Sano, N. Takahata, K. Tanaka, T. Imajo, S. Bowden, H. Tomaru
  • 学会等名: Japan Geoscience Union Meeting
  • 国際学会 / 招待講演
• [備考] ガスハイドレートの微小空隙中の微生物活動 によるマイクロドロマイトの生成
  • URL: https://www.meiji.ac.jp/koho/press/6t5h7p000032lu9c.html