The 132nd Annual Meeting of the Geological Society of Japan
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Session OralT2 ［Topic Session］From magma source and magma plumbing system to volcano formation and hydrothermal alterationEDI

[1oral601-08]T2. From magma source and magma plumbing system to volcano formation and hydrothermal alteration

Sun. Sep 14, 2025 9:15 AM - 11:45 AM JST
Sun. Sep 14, 2025 12:15 AM - 2:45 AM UTC
oral room 6(E305)
Chiar:Satoshi SAITO(Ehime University), Keisuke ESHIMA(Yamaguchi Univ. Sci. Tech. Innov.), Yuki KUSANO(Geological Survey of Japan, AIST)
9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[T2-O-1]Petrological and mineralogical characteristics of low-resistivity zones at a site of phreatic eruption: a case study from Iwo-yama, Kirishima Volcano

*Yuki Kusano1, Takumi Imura2, Ryuta Furukawa1, Takahiro Yamamoto1, Yoshihirp Ishizuka1, Jun’ichi Itoh1, Yoshio Matsushima1, Daisuke Asahina1, Keiichi Sakaguchi1 (1. Geological Survey of Japan, AIST, 2. Yamagata University)
9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[T2-O-2]Volcanic Unrest in Hydrothermal-Dominated Volcanoes and Its Interpretation through Porphyry System Frameworks

*Kazutaka Mannen1 (1. Hot Springs Research Institute of Kanagawa Prefecture)
9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[T2-O-3]Compositional changes and their significance of the large-scale porphyritic body that constitutes Northern Kyushu Batholith, SW Japan

*Keisuke ESHIMA1 (1. Yamaguchi Univ. Sci. Tech. Innov.)
10:00 AM - 10:30 AM JST(1:00 AM - 1:30 AM UTC)

[T2-O-4][Invited] Episyenite in Japan: Discovery and Geological Significance

*Shoji NISHIMOTO1 (1. Aichi Univ.)
10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)entryECS

[T2-O-5]Episyenites from Hakatajima Island, Geiyo Islands, Ehime Prefecture, Japan: transport and concentration of elements during alteration of granitoid by high-temperature hydrothermal fluid

*Toko FUKUI1, Kazuya SHIMOOKA2, Toshiro TAKAHASHI3, Satoshi SAITO1 (1. Ehime University, 2. Kwansei Gakuin University, 3. Niigata University)
10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[1oral601-08-6add]Break

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[T2-O-6]Geofluid mapping based on simultaneous analysis of seismic velocity and electrical conductivity: the connection between magmas, fluids, volcanoes, and earthquakes

*Hikaru IWAMORI1, Geofluid Mapping Team (1. Earthquake Research Institute, The University of Tokyo)
11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[T2-O-7]Petrological characteristics of ultramafic xenoliths in Pinatubo volcano

*Tomoaki Morishita1,2, Wataru Koguchi1, Norikatsu Akizawa3, Mayuko Fukuyama4, Akihiro Tamura1, Tomoyuki Mizukami1 (1. Kanazawa University, 2. JAMSTEC, 3. Hiroshima University, 4. Akita University)
11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[T2-O-8]Tectonics of Hahajima Seamount in the Ogasawara fore-arc: A preliminary study

*Katsuyoshi Michibayashi1,4, Itsuki Natsume2, Ikuo Katayama3, Go Fujie4 (1. Department of Earth and Planetary Sciences, GSES , Nagoya University, 2. Kanagawa Prefectural Museum of Natural History, 3. Hiroshima University, 4. JAMSTEC)
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