2023 Fiscal Year Final Research Report
Relationship between crustal degassing and microbial mineralization in active mud volcanoes, hydrocarbon seeps, and other environments
| Project/Area Number |
21K03739
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17050:Biogeosciences-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Snyder Glen 東京大学, 大気海洋研究所, 特任研究員 (90751777)
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| Co-Investigator(Kenkyū-buntansha) |
柿崎 喜宏 東京大学, 大学院理学系研究科(理学部), 特任研究員 (20570633)
白石 史人 広島大学, 先進理工系科学研究科(理), 准教授 (30626908)
松本 良 明治大学, 研究・知財戦略機構(生田), 研究推進員(客員研究員) (40011762)
戸丸 仁 千葉大学, 大学院理学研究院, 准教授 (80588244)
高畑 直人 東京大学, 大気海洋研究所, 助教 (90345059)
伊地知 雄太 東京大学, 大学院理学系研究科(理学部), 特任研究員 (10911258)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Methane / Cold Seep / Noble gas / Sea of Japan / Carbonate / Authigenic / Stable lsotopes / Gas hydrate |
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| Outline of Final Research Achievements |
This year we continued sampling and analyses of methane-derived authigenic carbonates (MDACs) and the seep water associated with them. For offshore Japan Sea samples, we used more archived samples. Sampling was also carried out on shore-based seeps from Mobara, in Chiba Prefecture. In addition to the previous years sampling, we employed methane sensors in the seep area to determine real-time methane concentrations and compare them with those of dissolved gas that was analyzed in the laboratory. The sampling allowed us to determine noble gas and stable carbon isotopes and to highlight the differences between gas seeps in Sea of Japan versus on the Pacific side. We also analyzed samples we had collected from seep sites in Tatar Strait 5 years ago, which provide an indicator of how seep compositions are site specific .
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| Free Research Field |
Isotope geochemistry
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| Academic Significance and Societal Importance of the Research Achievements |
Methane seeps are an integral part of the Earth's carbon cycle. The anoxic environments associated with them have been used as analogues for early Earth marine habitats. By studying the gas composition and the composition of MDACs we can elucidate the past and present dynamics of these systems.
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