[M-IS20] Interactions of Geosphere-Hydrosphere-Biosphere and Deep-sea Methane Environments

Sun. May 25, 2025 3:30 PM - 5:00 PM Exhibition Hall Special Setting (2) (Exhibition Hall 7&8, Makuhari Messe)

convener:Yusuke Miyajima(Geomicrobiology Research Group, Research Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Miho Asada(NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY ), Robert Jenkins(School of Geosciences and Civil Engineering, College of Science and Engineering, Kanazawa University), Shinsuke Aoki(Faculty of Agriculture, Kagawa University), Chairperson:Miho Asada(NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY), Robert Jenkins(School of Geosciences and Civil Engineering, College of Science and Engineering, Kanazawa University)

Methane produced in subseafloor environments is transported to the seafloor and discharged into seawater at cold seeps, mud volcanoes, and hydrothermal vents. The discharged methane and accompanying fluids form unique environments, such as methane hydrates and carbonates, and sustain chemosynthetic ecosystems. Methane and the methane-driven phenomena are closely related to the ocean and global environmental changes, material cycles, and evolution of life, making them a key for better understanding of the interactions among Geosphere-Hydrosphere-Biospheres. Deepening and expanding our knowledge of these processes will also contribute to the sustainable development of human society, including resource utilization, disaster prevention, and biodiversity and ecosystem conservation. This session welcomes latest research topics related to the geophysical background, resources, geobiology, and geochemical origin of methane and accompanying fluids at marine and terrestrial cold seeps, mud volcanoes, and hydrothermal vents from the past to present. Based on these topics, we aim to promote active interactions between scientists from multiple fields and the development of a multidisciplinary research community.
All the presentations in this session are given in Japanese or English. We recommend preparing figures and tables in English.

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3:30 PM - 3:45 PM

[MIS20-06] Emission of dissolved organic carbon from submarine mud volcanoes along the Ryukyu Trench

Yui Yoshizaki¹, Tatsuhiko Hoshino³, Shigeyoshi Otosaka², Youhei Yamashita⁴, Yohei Matsui³, Shinsuke Kawagucci³, Kazuyo Yamaji¹, Mmakoto Takeuchi², Kei Okamura⁵, Takuro Noguchi⁵, *Akira Ijiri¹ (1.Kobe University, 2.Atmosphere and Ocean Research Institute, The University of Tokyo, 3.JAMSTEC, 4.Hokkaido University, 5.Kochi University)

3:45 PM - 4:00 PM

[MIS20-07] Authigenic carbonates related to oil seepage from seafloor sediments – Geologic archives of unique geobiologic ecosystems

★Invited Papers

*Daniel Smrzka^1,2 (1.MARUM – Center for Marine and Environmental Sciences and Department of Geosciences, University of Bremen, 28359 Bremen, Germany, 2.Fachbereich Geowissenschaften, Universität Bremen, 28359 Bremen, Germany)

4:00 PM - 4:15 PM

[MIS20-08] Controlling Factors on the Biogenic Gas Generation along the Sea of Japan : A Case Study of Niigata Area

*Ryu Tomida¹, Yuta Yonekura¹, Miki Amo¹, Shogo Takeyama¹ (1.Japan Organization for Metals and Energy Security )

4:15 PM - 4:30 PM

[MIS20-09] Impacts of sedimentary structures on methane seep-related geochemical properties in the Kujukuri coastal area, eastern Japan

*Yuki Ota¹, Masahiro Suzumura¹, Ayumi Tsukasaki¹, Atsushi Suzuki¹, Kyoko Yamaoka¹, Masayuki Nagao¹, Satoru Takahashi¹, Akira Iguchi¹, Miyuki Nishijima¹, Kodai Gibu¹, Toru Tamura^1,2, Koji Seike^1,2, Shinsuke Aoki³, Haruka NAKANO⁴, Hiroshi Ishida⁵, Takeshi Yoshida⁶ (1.National Institute of Advanced Industrial Science and Technology (AIST), 2.Graduate School of Frontier Sciences, The University of Tokyo, 3.Faculty of Agriculture, Kagawa University, 4.Research Institute for Applied Mechanics, Kyushu University, 5.The Marine Ecology Research Institute, 6.Research Institute of Environmental Geology, Chiba Prefectural Environmental Research Center)

4:30 PM - 4:45 PM

[MIS20-10] An attempt to correct response time of methane sensor by deconvolution

*Shinsuke Aoki¹, Hideyoshi Yoshioka² (1.Faculty of Agriculture, Kagawa University, 2.Research Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST))

4:45 PM - 5:00 PM

[MIS20_25PM2-6add] Discussion

Session information