The 133rd Annual Meeting of the Geological Society of Japan
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Session PosterT5[Topic] Review and Future Perspectives on the Cretaceous to Paleogene Subduction-related Tectonics: Insights from Geology, Petrology, and Zircon Geochronology

T5[Topic] Review and Future Perspectives on the Cretaceous to Paleogene Subduction-related Tectonics: Insights from Geology, Petrology, and Zircon Geochronology

Tue. Sep 15, 2026 1:30 PM - 3:00 PM JST
Tue. Sep 15, 2026 4:30 AM - 6:00 AM UTC
T5_poster(Academic Promenade)

[T5-P-1]Origin of the mafic–ultramafic complex in the Sambagawa Belt, Saganoseki Peninsula, Eastern Kyushu

*Kenta KAWAGUCHI1, Mitsuhiro Nagata2, Yusuke Shimura3, Kosuke Kimura4 (1. Hiroshima University, 2. Nihon University, 3. Nagoya University, 4. Osaka Metropolitan University)
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[T5-P-2]Refinement of the radiolarian and calcareous nannofossil biostratigraphy of the Eocene strata in the Amakusa region, western Japan

*Kentaro USHIMARU1, Akihide KIKUKAWA2, Masayuki UTSUNOMIYA1 (1. National Institute of Advanced Industrial Science and Technology (AIST), Geological Survey of Japan, 2. Natural History Museum and Institute, Chiba)
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entryECS: Early Career Scientist

[T5-P-3]Zircon U–Pb ages of Cretaceous granitoids around the Iide Mountains, northern part of Ashio Belt

*Takuma DEGUCHI1, Tetsuya TOKIWA1, Hiroshi MORI1 (1. Shinshu Univ.)
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entryECS: Early Career Scientist

[T5-P-4]Zircon U–Pb ages of the Cretaceous volcanic rocks of the Oamamiyama Group

*Ryouichi HIRAMATSU1, Tetsuya TOKIWA1, Takuma DEGUCHI1, Takashi HONGO2, Hiroshi MORI1 (1. Shinshu Univ., 2. Alps Technical Research Laboratory Co., Ltd.)
Comment()
entryECS: Early Career Scientist

[T5-P-5]Zircon U-Pb ages of the Cretaceous volcanic rocks of the Okumino Acid Igneous Rocks

*Karin KANEMARU1, Tetsuya TOKIWA1, Takashi HONGOU2, Hiroshi MORI1 (1. Shinshu Univ., 2. Alps Technical Research Laboratory Co., Ltd.)
Comment()
ECS: Early Career Scientist

[T5-P-6]Oceanic plate stratigraphy and accretionary processes recorded in the Nakanogawa Group around the Hiroo area of Hidaka Belt, Hokkaido, Japan

*Reo HATAYAMA1, Hayato UEDA1, Daiki IWAI (1. Niigata University)
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entry

[T5-P-7]Reexamination of stratigraphy and geological structure of the Lower Cretaceous Todai Formation in the northwestern Akaishi Mountains

*Ryota KIMURA1, Yusuke SHIMURA1, Makoto TAKEUCHI1, Tetsuya TOKIWA2 (1. Nagoya University, 2. Shinshu University)
Comment()
entry

[T5-P-8]Distribution patterns of ultramafic bodies and regional schistosity in the northern Akaishi Mountains, Sanbagawa Belt

*Yuto YASUI1, Hiroshi MORI1, Nanami KUNIYA1, Kaho NOBUHARA1, Daichi MURAKAMI1,2, Taisei TAKAGI1, Tetsuya TOKIWA1, Wataru TANAKA1,3, Yuho HAYAKAWA1,4 (1. Shinshu University, 2. Nippon Koei Co., Ltd., 3. CTI Engineering Co., Ltd., 4. Chuo Kaihatsu Corporation)
Comment()
entryECS: Early Career Scientist

[T5-P-9]Tectonic evolution of Southwest Japan: Insights from multivariate analysis

*Hajime SOUMA1, Keisuke Eshima2 (1. Yamaguchi Univ., 2. Yamaguchi Univ. Sci. Tech. Innov.)
Comment()
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