[S-CG70] Ocean Floor Geoscience

Fri. May 29, 2026 1:45 PM - 3:15 PM Convention Hall (CH-B) (International Conference Hall, Makuhari Messe)

Chairperson:Yoshimura Yutaka(Faculty of Social and Cultural Studies, Kyushu University), Matsuyama Kazuki(Department of Earth and Planetary Sciences, GSES, Nagoya University)

Most of Earth's volcanism and much of its tectonic activity occur on and beneath the seafloor. Various seafloor phenomena are closely linked to plate tectonics, Earth's internal structure and dynamics, and are also connected to the Earth's environments through interactions with the hydrosphere and atmosphere. Rocks and sediments from the seafloor preserve records of Earth's evolution as well as its heat and material fluxes.
The Ocean Floor Geoscience session covers a broad range of research topics related to the seafloor, including mid-ocean ridge processes, subduction dynamics, arc and intraplate magmatism, crustal movement and structure, and more. All research fields and approaches are welcome. The session aims to encourage discussion among scientists from diverse disciplines and to integrate our understanding of the ocean floor.

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1:45 PM - 2:00 PM

[SCG70-16] Petrofabric and geochemical characteristics of Izu-Bonin forearc gabbroic rocks from KR08-07 and KH07-02 cruises

*Yumiko Harigane¹, Tomoaki Morishita², Akihiro Tamura², Kenichiro Tani³, Osamu Ishizuka¹, Katsuyoshi Michibayashi⁴ (1. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 2. Kanazawa University, 3. National Museum of Nature and Science, 4. Nagoya University)

2:00 PM - 2:15 PM

[SCG70-17] Olivine crystal-fabrics and deformation microstructures of peridotites derived from Mariana serpentinite seamounts: Results from KM23-05 Drilling Expedition

*Kazuki Matsuyama^1,2, Hikaru Sawada^3,4, Masakazu Fujii^5,6, Benoit Ildefonse², Katsuyoshi Michibayashi^1,7, Ken Takai⁴ (1. Department of Earth and Planetary Sciences, GSES, Nagoya University, 2. Géosciences Montpellier, University of Montpellier, CNRS, Montpellier, France, 3. Department of Earth System Science, School of Sustainable Design, University of Toyama, 4. X-STAR, JAMSTEC, 5. National Institute of Polar Research, 6. The Graduate University for Advanced Studies, 7. Volcanoes and Earth's Interior Research Center, IMG, JAMSTEC)

2:15 PM - 2:30 PM

[SCG70-18] Petrological and geochemical characteristics of the oceanic lithosphere in the South Pacific as indicated by mantle xenoliths from Tubuai and Samoa Islands

Fuku Fukase¹, *Tetsu Kogiso¹, Akira Ishikawa², Norikatsu Akizawa³, Akihiro Tamura⁴, Tomoaki Morishita⁴, Ikuya Nishio³, Yuka Niwa², Yuya Sugiyama² (1. Kyoto Univ., 2. Science Tokyo, 3. Hiroshima Univ., 4. Kanazawa Univ.)

2:30 PM - 2:45 PM

[SCG70-19] Volcanic Clasts Far from Home: Iceberg-rafted mantle xenolith–bearing volcanic clasts along the Antarctic margin

*Hiroshi Sato¹, Shiki Machida², Kana Ashida², Masakazu Fujii^3,4 (1. School of Business Administration, Senshu University, 2. Ocean Resources Research Center for Next Generation, Chiba Institute of Technology, 3. National Institute of Polar Research, 4. The Graduate University for Advanced Studies, SOKENDAI)

2:45 PM - 3:00 PM

[SCG70-20] “Weak” paleomagnetic field intensity in the Cretaceous Normal Superchron measured from the drilling core basalts of the Central Kerguelen plateau Elan Bank and implications of thermal condition at the core-mantle boundary

*Yutaka Yoshimura¹, Masakazu Fujii^2,3, Chie Kato^1,4, Osamu Ishizuka^5,6, Kenji Shimizu⁷, Ryosuke Oyanagi^8,6 (1. Faculty of Social and Cultural Studies, Kyushu University, 2. National Institute of Polar Research, 3. The Graduate University for Advanced Studies, SOKENDAI, 4. Advanced Asian Archaeological Research Center, Kyushu University, 5. Geological Survey of Japan, AIST, 6. JAMSTEC, 7. Kochi Institute of Core Sample Research, JAMSTEC, 8. Kokushikan University)

3:00 PM - 3:15 PM

[SCG70-21] Seafloor Survey of Off-Miyagi Japan Trench with Urashima 8000

*Toshiya Fujiwara¹, Takeshi Nakatani², Tatsuya Aso², Yoshitaka Watanabe², Takao Sawa², Ayaka Yomoda², Kazuya Iwashita², Shinobu Omika³, Mitsuru Torigoe³, Junji Kaneko⁴, Kazuya Kitada⁵, Takashi Ohmura⁶, Koji Meguro⁷, Mamoru Sano⁸, Souta Shimura⁸ (1. Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 2. Research Institute for Marine Technology and Engineering, Japan Agency for Marine-Earth Science and Technology, 3. Institute for Marine-Earth Exploration and Engineering, Japan Agency for Marine-Earth Science and Technology, 4. Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology, 5. Institute for Extra-cutting-edge Science and Technology Avant-garde Research, Japan Agency for Marine-Earth Science and Technology, 6. Idea Consultants, Inc., 7. Hitachi, Ltd., 8. Nippon Marine Enterprises, Ltd.)

Session information