Japan Geoscience Union Meeting 2022

Session information

[J] Oral

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG56] Oceanic plate as inputs to subduction zone: evolution process of the oceanic plate

Thu. May 26, 2022 9:00 AM - 10:30 AM 101 (International Conference Hall, Makuhari Messe)

convener:Gou Fujie(Japan Agency for Marine-Earth Science and Technology), convener:Makoto Yamano(Earthquake Research Institute, the University of Tokyo), Tomoaki Morishita(School of Geoscience and Civil Engineering, College of Science and Technology, Kanazawa University), convener:Takanori Kagoshima(University of Toyama), Chairperson:Takanori Kagoshima(University of Toyama), Makoto Yamano(Earthquake Research Institute, the University of Tokyo)

As the inputs to subduction zone, the nature of the incoming oceanic plate, such as surface relief, thermal state, lithology, and the water content, affects various processes occurring in the subduction zone, including arc magmatism and interplate and intraplate seismic activities. The oceanic plate is formed in the oceanic spreading ridge and moves through the ocean basin for a long time and subducts from the oceanic trench. The nature of the incoming oceanic plate is determined by all the processes occurring from the spreading ridge to the subduction trench; e.g., hydrothermal circulation, sedimentation and diagenesis for more than millions years at the oceanic basin, and plate bending-related faulting near the subduction trench. Therefore, for studying the nature of the subduction inputs, it is essential to reveal the various evolution processes of the oceanic plate between the spreading ridge and the subduction trench.

We welcome contributions from a broad range of earth science (geophysics, geology, petrology, drilling science, and so on) discussing topics related to the inputs to subduction zones, such as tectonic process associated with the plate bending prior to subduction, post-spreading volcanic activities including large seamount formation and petit-spot volcanoes, and the nature of the "normal" or "typical" oceanic plate.

This session is supported by the focus group of hard rock drilling science.

9:00 AM - 9:20 AM

*Norikatsu Akizawa1, Kazuhito Ozawa1, Tetsu Kogiso2, Akira Ishikawa3, Simon Richard Wallis4, Tatsuhiko Kawamoto5, Akihiro Tamura6, Tomoaki Morishita6 (1.Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, The University of Tokyo, 2.Graduate School of Human and Environmental Studies, Kyoto University, 3.Department of Earth and Planetary Sciences, Tokyo Institute and Technology, 4.Department of Earth and Planetary Science, University of Tokyo, 5.Department of Geosciences, Faculty of Science, Shizuoka Universit, 6.School of Geoscience and Civil Engineering, Kanazawa University)

10:05 AM - 10:30 AM

*Shuichi Kodaira1, Yasuyuki Nakamura1, Tetsuo No1, Gou Fujie1, Koichiro Obana1, Seiichi Miura1, Toshitaka Baba2, Naotaka YAMAMOTO CHIKASADA3, Kentaro Imai1, Yuichiro Tanioka4 (1.Research Institute of Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 2.Graduate School of Science and Technology,Tokushima University, 3.Earthquake and Tsunami Research Division, National Research Institute for Earth Science and Disaster Resilience, 4.Institute of Seismology and Volcanology, Hokkaido University )

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