[S-CG60] Hard-Rock Drilling Science: Continental and Deep-Sea Drilling, and Ophiolite

Wed. May 27, 2026 9:00 AM - 10:30 AM 301A (International Conference Hall, Makuhari Messe)

Chairperson:Harigane Yumiko(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)), Hoshide Takashi(Faculty of International Resource Sciences, Akita University), Michibayashi Katsuyoshi(Department of Earth and Planetary Sciences, GSES , Nagoya University), Okazaki Keishi(Earth and Planetary Systems Science Program, Hiroshima University)

The International Ocean Drilling Programme (IODP3), led by Japan and Europe, has launched since 2025The International Continental Scientific Drilling Program (ICDP) has already implemented a new science plan, "the ICDP Science Plan 2020-2030". Thus, hard rock drilling science in both ocean and continent is entering the next phase, in which new drilling proposals from unprecedented perspectives and the production of novel scientific outcomes based on existing drilling projects are highly anticipated. This session invites presentations related to "hard-rock" studies, including results from continental and ocean drilling projects. We also welcome a wide range of research contributions that are not limited to drilling, such as studies of ophiolite complexes, experimental investigations, and other research targeting rocks and minerals that constitute the Earth and other terrestrial planets.

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9:00 AM - 9:15 AM

[SCG60-01] Amagmatic mylonitic deformation of mantle peridotites from the Tosa Megamullion in the Shikoku Basin, Philippine Sea

*Katsuyoshi Michibayashi^1,2, So Inoue¹, Yumiko Harigane³, Yasuhiko Ohara^1,2,4 (1. Department of Earth and Planetary Sciences, GSES , Nagoya University, 2. Volcanoes and Earth's Interior Research Center, IMG, JAMSTEC, 3. GSJ/AIST, 4. Hydrographic and Oceanographic Department of Japan)

9:15 AM - 9:30 AM

[SCG60-02] Alteration of the oceanic crust inferred from physical properties of dredged samples from Mariana Trench and Marie Celeste Transform Fault

★Invited Papers

*Tomohiro Ito¹, Ikuo Katayama¹, Yuya Akamatsu², Masakazu Fujii^3,4, Kyoko Okino⁵, Yasuhiko Ohara^2,6,7, Hiroyuki Yamashita⁸ (1. Department of Earth and Planetary Systems Science, Hiroshima University, 2. Research Institute for Marine Geogynamics, JAMSTEC, 3. National Institute of Polar Research, 4. SOKENDAI (The Graduate University for Advanced Studies), 5. Atmosphere and Ocean Research Institute, The University of Tokyo, 6. Hydrographic and Oceanographic Department of Japan, 7. Department of Earth and Planetary Sciences, Nagoya University, 8. Kanagawa Prefectural Museum of Natural History)

9:30 AM - 9:45 AM

[SCG60-03] Olivine Crystallographic Fabrics and Melt–Rock Interaction in Peridotites from the Southern Mariana Forearc Ridge.

*Kana Miyata¹, Katsuyoshi Michibayashi^1,2 (1. Department of Earth and Planetary Sciences, GSES, Nagoya University, 2. Volcanoes and Earth's Interior Research Center, IMG, JAMSTEC)

9:45 AM - 10:00 AM

[SCG60-04] Early armalcolite saturation recorded by Ti-rich chromian spinel in lower crustal gabbros from Hess Deep, East Pacific Rise (IODP Exp. 345, Hole U1415P)

*Akira Chiba¹, Takashi Hoshide¹, Keita Kondo² (1. Graduate School of International Resource Science, Akita University, 2. Kitai Sekkei Co., Ltd.)

10:00 AM - 10:15 AM

[SCG60-05] Drilling Multiple Oceanic Core Complexes in the Shikoku Basin: A Geodynamic Backarc Transect from Early Rifting to Basin Termination

*Yasuhiko Ohara^1,2,3, Valentin Basch⁴, Marco Cuffaro⁵, Masakazu Fujii¹⁰, Yumiko Harigane⁶, Osamu Ishizuka⁶, Katsuyoshi Michibayashi², Kohei Nimura², Kyoko Okino⁷, Ryosuke Oyanagi⁸, Alessio Sanfilippo⁴, Jonathan E. Snow⁹, Kenichiro Tani¹¹, Hiroyuki Yamashita¹² (1. Hydrographic and Oceanographic Department of Japan, 2. Nagoya Universtiy, 3. Japan Agency for Marine-Earth Science and Technology, 4. University of Pavia, 5. National Research Council of Italy, 6. Geological Survey of Japan/AIST, 7. Atmosphere and Ocean Research Institute, University of Tokyo, 8. Kokushikan University, 9. Lousiana State University, 10. National Institute of Polar Research, 11. National Museum of Nature and Science, 12. Kanagawa Prefectural Museum of Natural History)

10:15 AM - 10:30 AM

[SCG60-06] Life Cycle of Oceanic Spreading: Shikoku/Parece Vela Basins

★Invited Papers

*Jonathan E Snow¹, Katsuyoshi Michibayashi³, Kyoko Okino^3,4, Alessio Sanfilippo², Sarah Seale¹, Yasuhiko Ohara⁵ (1. Louisiana State University, Baton Rouge, LA, 70803 USA, 2. Department of Earth and Environmental Science, University of Pavia, Pavia, Italy, 3. Department of Earth and Planetary Sciences, GSES , Nagoya University, 4. Atmosphere and Ocean Research Institute, The University of Tokyo, 5. Hydrographic and Oceanographic Department of Japan)

Session information

[S-CG60] Hard-Rock Drilling Science: Continental and Deep-Sea Drilling, and Ophiolite

[SCG60-01] Amagmatic mylonitic deformation of mantle peridotites from the Tosa Megamullion in the Shikoku Basin, Philippine Sea

[SCG60-02] Alteration of the oceanic crust inferred from physical properties of dredged samples from Mariana Trench and Marie Celeste Transform Fault

★Invited Papers

[SCG60-03] Olivine Crystallographic Fabrics and Melt–Rock Interaction in Peridotites from the Southern Mariana Forearc Ridge.

[SCG60-04] Early armalcolite saturation recorded by Ti-rich chromian spinel in lower crustal gabbros from Hess Deep, East Pacific Rise (IODP Exp. 345, Hole U1415P)

[SCG60-05] Drilling Multiple Oceanic Core Complexes in the Shikoku Basin: A Geodynamic Backarc Transect from Early Rifting to Basin Termination

[SCG60-06] Life Cycle of Oceanic Spreading: Shikoku/Parece Vela Basins

★Invited Papers

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