[S-MP32] Oceanic & Continental Subduction Processes: petrologic/geophysical/geochemical perspective

Tue. May 26, 2026 9:00 AM - 10:30 AM Exhibition Hall Special Setting (6) (Exhibition Hall 7&8, Makuhari Messe)

Chairperson:REHMAN U. HAFIZ(Kagoshima University), Das Kaushik(Hiroshima University), Imayama Takeshi(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 geophysical and geochemical analysis of rocks and minerals enable 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 2026 AGU-JpGU Joint Meeting 2026, 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, accretion/tectonic erosion of material along subduction zones and related topics. In addition, newly obtained data from geochemical and geophysical methodologies, modeling, and their interpretation to unravel earth process are very welcomed.

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9:00 AM - 9:15 AM

[SMP32-01] Subduction or Non-Subduction? A Critical Reappraisal of the Nagaland–Manipur Ophiolites in the Western margin of the Burma microplate

*Nongmaithem Lakhan Singh¹ (1. Department of Earth Sciences, Manipur University, Canchipur, India)

9:15 AM - 9:30 AM

[SMP32-02] Fluid-rock interaction processes during blueschist to eclogite facies metamorphism (Syros, Greece): a mineral oxygen isotope and trace element perspective

*Thorsten Andreas Markmann^1,2, Pierre Lanari³, Valentin Laurent⁴, Daniela Rubatto^1,3, Thomas Bovay³ (1. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, CH-3012 Bern, Switzerland, 2. Earth Observatory of Singapore, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore, 3. Institute of Earth Sciences, University of Lausanne, Géopolis, Quartier Mouline, 1015 Lausanne, Switzerland, 4. Earth Science and Engineering, Imperial College London, London, UK)

9:30 AM - 9:45 AM

[SMP32-03] High-pressure metagabbros associated with metaserpentinites in eastern Taiwan: Petrologic characteristics and tectonic implications

*Chin-Ho Tsai¹, Chih-Ying Yeh¹, Yoshiyuki Iizuka² (1. Department of Natural Resources and Environmental Studies, National Dong Hwa University, Taiwan, 2. Institute of Earth Sciences, Academia Sinica, Taiwan)

9:45 AM - 10:00 AM

[SMP32-04] Role of phyllosilicates in the weakening behavior of brittle fault zones: insights from natural samples and low-to-high velocity rotary shear experiments

*Dyuti Prakash Sarkar¹, Takehiro Hirose², Gautam Ghosh³, Arkaneel Saha⁴ (1. Division of Geosphere Sciences, Yamaguchi University, Yamaguchi, Japan, 2. Kochi Institute for Core Sample Research, Japan Agency for Marine Earth Science and Technology, Nankoku, Japan, 3. Department of Geology, Presidency University, Kolkata, India, 4. School of Earth, Environmental and Sustainability Sciences, IISER Thiruvananthapuram, Thiruvananthapuram, India)

10:00 AM - 10:15 AM

[SMP32-05] Garnet Records Peripheral Subduction of the Rodinia Supercontinent: Evidence from the Northwestern Margin of the Yangtze Craton

★Invited Papers

*HAOZHENG WANG^1,2, Linfeng Feng², Byungchoon Lee¹ (1. Department of Geological and Environmental Sciences, Chonnam National University, Korea, 2. School of Geoscience and Technology, Southwest Petroleum University, China)

10:15 AM - 10:30 AM

[SMP32-06] Thermodynamic constraints on devolatilization of variably altered oceanic ultramafic rocks during subduction: Implications for subarc mantle oxidation

*Weigang Peng¹, Katy A. Evans², James A.D. Connolly³, Yi-Bing Li⁴, Han Hu⁵, Lifei Zhang⁶ (1. Hohai University, 2. Curtin University, 3. ETH Zurich, 4. Zhejiang Ocean University, 5. China Earthquake Administration, 6. Peking University)

Session information