[S-MP25] Oceanic and Continental Subduction Processes

Mon. May 26, 2025 3:30 PM - 5:00 PM 304 (International Conference Hall, Makuhari Messe)

convener:HAFIZ REHMAN(Kagoshima University), Takeshi Imayama(Research Institute of Frontier and Science Technology, Okayama University of Science), Kaushik Das(Hiroshima University), Chairperson:HAFIZ REHMAN(Kagoshima University), Takeshi Imayama(Research Institute of Frontier and Science Technology, Okayama University of Science)

Major orogenic belts on earth are formed by multi-dynamic processes such as subduction and collision. The resulted belts extend for hundreds of kilometers and the lithological or tectonic units preserve records of the evolutionary events. Investigation of such orogenic belts on a regional scale, rocks and minerals on a macro- and micro-scale, and understanding how, when and under what conditions the rocks and minerals formed allow earth scientists to elucidate geological events that occurred in the earth's interior and/or near the surface. Investigation of stress-strain regimes of rocks and minerals envisage deformation at plate-scale. Similarly, investigating crystallization/recrystallization of minerals from magma or due to metamorphic reactions, we can interpret the past events of the earth's history. Detailed geochemical analysis of bulk rock and minerals enables us to understand water-rock/fluid interaction in the formation of new minerals, growth, and recrystallization. Moreover, geochronological investigations of specific minerals (such as zircon, garnet, rutile, apatite etc.) give information regarding the time-scale of crustal growth or metamorphic events.
The proposed international session in the JpGU-2025, a continuation from the last (> ten years) sessions, aims to bring together earth scientists from Japan and overseas to present their research related to the processes of subduction, collision, and metamorphism of crustal rocks, formation of oceanic/continental arcs, and accretion/tectonic erosion of material along subduction boundaries and related topics. In addition, newly obtained data from geochemical and geophysical methodologies, modeling and interpretation will be focus of the session.

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3:30 PM - 3:45 PM

[SMP25-01] Supra-subduction zone magmatism and extreme mantle depletion in the Early Cretaceous Nidar Ophiolite Complex, NW India

Akinori Sato¹, *Takeshi Imayama¹, Dripta Dutta¹, Yasuaki Kaneda², Shota Watanabe^2,3, Takeshi Hasegawa², Masayo Minami⁴, Yuki Wakasugi^4,5, Shigeyuki Wakaki^6,7, Keewook Yi⁸ (1.Institute of Frontier and Science Technology, Okayama University of Science, 2.Graduate School of Science and Engineering, Ibaraki University, 3.Mount Fuji Research Institute, Yamanashi Prefectural Government, 4.Institute for Space-Earth Environmental Research, Nagoya University, 5.Gangoji Institute for Cultural Properties, 6.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 7.National Museum of Japanese History, National Institutes for the Humanities, 8.Korea Basic Science Institute)

3:45 PM - 4:00 PM

[SMP25-02] Prograde P-T evolution of eclogites from the Song Ma suture zone, northern Vietnam

*Tadashi Usuki¹, Duc Nam Nguyen¹, Ching-Hua Lo¹, Yoshiyuki Iizuka² (1.Department of Geosciences, National Taiwan University, 2.Institute of Earth Sciences, Academia Sinica)

4:00 PM - 4:15 PM

[SMP25-03] Characterization of diverse thermal trends in Western Himalayan Metamorphic rocks deduced from the Raman spectroscopy of carbonaceous material

*Nasir Ahmad¹, Hafiz Rehman¹, Shah Faisal², Mehboob Ur Rashid^1,3, Asad Khan⁴, Muhammad Hussain¹ (1.Graduate School of Science and Engineering, Kagoshima University, Japan, 2.Geovector Management Inc., Ontario, Canada, 3.Geoscience Advance Research Labs, Geological Survey of Pakistan, 4.Department of Geology, FATA University, Pakistan)

4:15 PM - 4:30 PM

[SMP25-04] Role of phyllosilicates on slip direction reversals in Himalayan Frontal Fold Thrust Belt

*Dyuti Prakash Sarkar¹, Jun-ichi Ando², Gautam Ghosh³, Kaushik Das², Naotaka Tomioka⁴, Sankar Bose³ (1.Yamaguchi University, 2.Hiroshima University, 3.Presidency University Kolkata, 4.Kochi Institute for Core Sample Research, JAMSTEC)

4:30 PM - 4:45 PM

[SMP25-05] The geological evolution of the north-eastern Arunachal Himalaya, India: a testament to erstwhile subduction and ongoing collision between Indian and Eurasian plates

*TOKU OMEN ATTE¹, SNEHA SABU¹, AMITAVA CHATTERJEE¹ (1.Department of Earth Sciences, School of Physical, Chemical and Applied Sciences Pondicherry University, India)

4:45 PM - 5:00 PM

[SMP25-06] Amphibole-albite rock in a metasomatic zone: a record of subduction metamorphism at the slab-mantle interface and its tectonic implications

*Dominikus Deka Dewangga¹, Wen-Han Lo¹, Chin-Ho Tsai¹, Yui Kouketsu², Yoshiyuki Iizuka³, Hao-Yang Lee³ (1.Department of Natural Resources and Environmental Studies, National Dong Hwa University, Taiwan, 2.Graduate School of Environmental Studies, Nagoya University, Japan, 3.Institute of Earth Sciences, Academia Sinica, Taiwan.)

Session information