The 132nd Annual Meeting of the Geological Society of Japan
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Session OralT1 ［Topic Session］Metamorphic rocks and tectonicsEDI

[1oral201-11]T1. Metamorphic rocks and tectonics

Sun. Sep 14, 2025 8:45 AM - 12:00 PM JST
Sun. Sep 14, 2025 11:45 PM - 3:00 AM UTC
oral room 2(E107)
Chiar:Tatsuro ADACHI(Kyushu University), Ippei KITANO(The Hokkaido University Museum, Hokkaido University)
8:45 AM - 9:00 AM JST(11:45 PM - 12:00 AM UTC)entryECS

[T1-O-1]Re-examination of the origins for the Jurassic plutonic rocks in the Hida belt using geochemical modeling

*Kodai MIKAMI1, Tomoyuki MIZUKAMI1 (1. Kanazawa University)
9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)entry

[T1-O-2]Partial melting of lower crust and compositional variation in S-type granitic magma in the Osuzuyama acidic rocks, Miyazaki prefecture, SW Japan.

*Takuto Kitashiro1, Toshiaki SHIMURA1 (1. Yamaguchi Univ.)
9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)entry

[T1-O-3]Subsurface lithological structure in the San’in region inferred from metagranitoid xenoliths from Mt. Daisen, Tottori Prefecture, Japan

*Mizuki Takahashi1, Shunsuke Endo1, Nobuhiko Nakano2, Tatsuro Adachi2 (1. Shimane Univ., 2. Kyusyu Univ.)
9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[T1-O-4]Zincian spinel + quartz + andalusite assemblage from the Kanenari metamorphic rock, Un-nan area, Shimane prefecture, SW Japan

*Toshiaki Shimura1, Kiri Yamane1,2, Shoichi Gota3,4 (1. Yamaguchi University, 2. Suncoh Consultants Co., Ltd., 3. Niigata University, 4. Tetsudokiki Co., Ltd.)
9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)entry

[T1-O-5]Rutiles indicating ultrahigh-temperature metamorphism in a garnet–biotite gneiss from Brattnipene, Sør Rondane Mountains, East Antarctica

*Hiroto GONDO1, Tetsuo KAWAKAMI1, Fumiko HIGASHINO1, Tatsuro ADACHI2, Masaoki UNO3 (1. Kyoto Univ., 2. Kyusyu Univ., 3. Tokyo Univ.)
10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[T1-O-6]Metamorphic pressure-temperature conditions of garnet peridotite from the eastern part of the Bohemian massif

*Daisuke NAKAMURA1, Utuse YOSHIDA1 (1. Okayama University)
10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[1oral201-11-7add]Break

10:30 AM - 11:00 AM JST(1:30 AM - 2:00 AM UTC)

[T1-O-7][Invited] Tectonic evolution of Northeast Asia and the origin of Proto-Japan during the Paleozoic to Mesozoic

*Kenta KAWAGUCHI1 (1. Hiroshima University)
11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)entryECS

[T1-O-8]P–T evolution and U–Pb ages of the Komori metamorphic rocks in the northern subzone, Maizuru Terrane: Implications for Tectonics in East Asia

*Sota Muroi1, Kenta Kawaguchi1, Kaushik Das1, Nobuhiko Nakano2, Yasutaka Hayasaka3 (1. Hiroshima University, 2. Kyushu University, 3. Amakusa Museum of Goshoura Dinosaur Island)
11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)ECS

[T1-O-9]Hydrothermal Alteration and Porosity Evolution of Lower Crust: Plagioclase Replacement by Epidote in the Khantaishir ophiolite, Western Mongolia

*OTGONBAYAR DANDAR1, ATSUSHI OKAMOTO1, MASAOKI UNO2, NORIYOSHI TSUCHIYA1,3 (1. Graduate School of Environmental Studies, Tohoku University, 2. Department of Earth and Planetary Science, The University of Tokyo, 3. National Institute of Technology, Hachinohe College)
11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[T1-O-10]Pressure-temperature structure of high-temperature metamorphic rocks around Mt. Raizan and the Itoshima Peninsula, northwestern Kyushu: a possible western extension of the Ryoke arc.

*Kazuhiro Miyazaki1, Yayoi Muraoka1, Takeshi Ikeda2, Tadai Nishiyama3 (1. Geological Survey of Japan, AIST, 2. Kyushu Univ., 3. Kumamoto Univ.)
11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[T1-O-11]K-Ar geochronology of Abukuma metamorphic belt in NE Japan: towards a formation model of the plutonic metamorphic belt over 1,000km

*Tetsumaru ITAYA1 (1. Hiruzen Institute for Geology & Chronology)
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