[S-CG46] New Insights of Fluid-Rock Interactions: From Surface to Deep Subduction Zone

Wed. May 29, 2024 9:00 AM - 10:30 AM 301B (International Conference Hall, Makuhari Messe)

convener:Atsushi Okamoto(Graduate School of Environmental Studies), Jun Muto(Department of Earth Sciences, Tohoku University), Ikuo Katayama(Department of Earth and Planetary Systems Science, Hiroshima University), Junichi Nakajima(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Chairperson:Ikuo Katayama(Department of Earth and Planetary Systems Science, Hiroshima University), Junichi Nakajima(Department of Earth and Planetary Sciences, Tokyo Institute of Technology)

Fluid circulation and fluid-mediated reactions and mass transport in the Earth's interior govern active phenomena within crust and mantle, such as earthquakes, volcanism, metamorphism, and formation of ore deposits. In this session, we will discuss the micro- to field-scale fluid-rock interactions related to chemical reactions, mass transport, deformation from near-surface to deep subduction zone, and their impact on global elemental cycles and seismicity. Recent progress of various studies on fluid-rock interactions in geothermal systems, mineralization, serpentinization, carbonation, metamorphism and metasomatism in deep subduction zones are welcome. We would like to comprehensively discuss the impact of these processes on global element cycles, surface environments and seismic activities. We welcome research from various approaches such as field studies, laboratory experiments, geophysical observations, numerical simulations.

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9:00 AM - 9:15 AM

[SCG46-10] Recent crustal earthquakes in Japan related to fluid movement

★Invited Papers

*Keisuke Yoshida¹ (1.Tohoku University)

9:15 AM - 9:30 AM

[SCG46-11] Does an asperity recover its shear strength in a short interval?

*Junichi Nakajima¹, Akira Hasegawa² (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2.Graduate School of Science, Tohoku University)

9:30 AM - 9:45 AM

[SCG46-12] Traces of fluid pathway in underplating oceanic crust left at the lithologic boundary of pelitic and mafic schist

*Matsuno Satoshi¹, Masaoki Uno¹, Atsushi Okamoto¹ (1.Tohoku University)

9:45 AM - 10:00 AM

[SCG46-13] Analysis of water-rock reactions in fault rocks using the pseudosection: an example from a ductile shear zone in the crust-mantle boundary of the Oman ophiolite

*Natsume Itsuki^1,2, Yui Kouketsu¹, Katsuyoshi Michibayashi^1,3, Atsushi Okamoto⁴ (1.Department of Earth and Planetary Sciences, GSES, Nagoya University, 2.Kanagawa Prefectural Museum of Natural History, 3.Volcanoes and Earth’s Interior Research Center, IMG, JAMSTEC, 4.Research School of Environmental Studies, Tohoku University)

10:00 AM - 10:15 AM

[SCG46-14] Fluid migration processes in oceanic plates based on vein mapping in the Oman Ophiolite

*Genya Sakamoto¹, Ikuo Katayama¹, Keishi Okazaki¹, Kazumasa Tanimoto¹, Yuya Akamatsu² (1.Hiroshima university, 2.Japan Agency for Marine-Earth Science and Technology)

10:15 AM - 10:30 AM

[SCG46-15] Numerical simulations of spontaneous subduction initiation in the oceanic lithosphere: Effects of rheology of hydrated fracture zones and slab dehydration

*Misuzu Ishikawa¹, Ken-ichi Hirauchi², Masaki Yoshida³ (1.Department of Geosciences, Graduate School of Integrated Science and Technology, Shizuoka University, 2.Department of Geosciences, Faculty of Science, Shizuoka University, 3.Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

Session information