Japan Geoscience Union Meeting 2022

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[J] Oral

B (Biogeosciences ) » B-GM Geomicrobiology

[B-GM02] Rock-Bio Interactions and its Applications

Mon. May 23, 2022 1:45 PM - 3:15 PM 304 (International Conference Hall, Makuhari Messe)

convener:Yohey Suzuki(Graduate School of Science, The University of Tokyo), convener:Konomi Suda(National Institute of Advanced Industrial Science and Technology), Fumito Shiraishi(Earth and Planetary Systems Science Program, Graduate School of Advanced Science and Engineering, Hiroshima University), convener:Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Chairperson:Yohey Suzuki(Graduate School of Science, The University of Tokyo), Konomi Suda(National Institute of Advanced Industrial Science and Technology)

2:15 PM - 2:35 PM

[BGM02-03] Microbial methane production activity of subsurface marine sediments in the eastern Nankai Trough

★Invited Papers

*Hideyopshi Yoshioka1, Taiki Katayama1, Masanori Kaneko1, Susumu Sakata1, Miki Amo2, Tetsuya Fujii2 (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.Japan Oil, Gas and Metals National Corporation)

Keywords:methane, methane production, methanogen, methane hydrate, Nankai Trough

Biogenic methane is widely distributed in the environment and is considered to be produced by methanogens through metabolic activities. So far, microbial methanogenesis in the subsurface marine sediments is thought to occur at depths deeper than the sulfate methane interface (SMI) in the sediments. However, it is not well understood what types of methanogens are distributed in the subsurface environment and what volume of methane they produce. In this study, in the eastern Nankai Trough where biogenic methane hydrate (MH) is distributed, the sediment cores from the seafloor surface to the MH concentrated zone were collected, and we showed that various methanogens were distributed in the area and had methanogenic activity. We also succeeded in isolating a variety of live methanogens by culture experiments and clarified their temperature characteristics. These results provide a clue to the elucidation of the formation mechanism of biogenic MH. This study was conducted as a part of the research of the Methane Hydrate Research and Development Consortium (MH21).