The 132nd Annual Meeting of the Geological Society of Japan
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Session OralT13 ［Topic Session］Regional geology and stratigraphy: Progress and Review

[3oral601-09]T13. Regional geology and stratigraphy: Progress and Review

Tue. Sep 16, 2025 9:00 AM - 12:00 PM JST
Tue. Sep 16, 2025 12:00 AM - 3:00 AM UTC
oral room 6(E305)
Chiar:Jun HOSOI(Department of Earth Sciences, Ibaraki University), Takayuki Uchino(Geological Survey of Japan/AIST), Yui KANAZASHI(Hirosaki Univ.), Taqumi TUZINO(Geological Survey of Japan/AIST)
9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)

[T13-O-10]Zircon U-Pb age and formation process of the Tsubonosawa Metamorphic Rock in the Hikami Granites, South Kitakami Belt.

*Takayuki Uchino UCHINO1, Testuya TOKIWA2 (1. Geological Survey of Japan, AIST, 2. Shinshu University)
9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[T13-O-11]The Kurosegawa belt (Japan) as a part of pre-Jurassic Nipponides orogen in East Asia: geotectonic significance of Triassic accretionary complex in Choshi

*Yukio ISOZAKI1, Yukiyasu TSUTSUMI2, Naoya IWAMOTO3, Shuro UEDA3 (1. Dept. Earth Sci. & Astron. Univ. Tokyo, 2. Department of Science, National Museum of Nature and Science, 3. Choshi Geopark Promotion Council Office, Choshi-City Board of Education)
9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[T13-O-12]Stratigraphy, geological age and depositional process of the Upper Jurassic-Lower Cretaceous Birafu Formation in the Monobe area, Kochi Prefecture, Japan

*Yoshihiro MORINO1 (1. Pacific Consultants Co.,Ltd.)
9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[T13-O-13]Reappraisal of stratigraphy of the Tanzawa and the Misaka Mountains, and its collision and accretion (a subsequent report -Zircon age in tuff beds-)

*Tadashi Nishikawa1, Kanae Shirai1, Kazutoshi Horiuchi1, Junko Toyoda1, Tatsuro Chiba1 (1. Tanzawa T Reseach Group)
10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[3oral601-09-5add]Break

10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)entry

[T13-O-14]Field occurrence and zircon U-Pb age of Miocene volcanic rocks in the Sai area, western Shimokita Peninsula, Aomori prefecture, Japan

*Yui KANAZASHI1, Yuji ORIHASHI1, Mizuha TAKEMORI1, Hideki IWANO2,3, Sota NIKI4, Minoru SASAKI1, Syu MORIAI5, Yoshihiro ASAHARA4, Tadashi AMANO6, Koji UMEDA1, Takafumi HIRATA3 (1. Hirosaki Univ. , 2. Kyoto FT, 3. Univ. of Tokyo, 4. Nagoya Univ., 5. Sanriku Geopark Promotion Council, 6. J-POWER)
10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

[T13-O-15]Geology and radiometric ages of the Upper Miocene in the eastern part of Shimokita Peninsula , Aomori prefecture

*Takahiro Nakamitsu1, Koichi SUTO2, Tadashi Miwa3 (1. Tohoku Electric Power, 2. Hanshin Consultants, 3. Dia Nippon Engineering Consultants)
10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)entry

[T13-O-16]Geological Structure of a Newly Discovered Complex Caldera in the Distribution Area of the Ohata Formation from the Pliocene to Early Pleistocene, Shimokita Peninsula: Constraints from Occurrence, Petrological Characteristics, and zircon U–Pb age

*Hayate YOSHIDA1, Yuji ORIHASHI1, Minoru SASAKI1, Yui KANAZASHI1, Hideki IWANO2,3, Koji UMEDA1, Tadashi AMANO4, Takafumi HIRATA2 (1. Hirosaki Univ., 2. Univ.of Tokyo, 3. Kyoto FT, 4. J-POWER)
11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[3oral601-09-9add]Break

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[T13-O-17]Stratigraphic relationship and boundary ages of the Miocene Yamanouchi and Motegi Formations, Nakagawa Group, in the Motegi area, Tochigi, Japan

*Jun HOSOI1, Hinako KOSAKA1, Hideki IWANO2,3, Tohru DANHARA2, Takafumi HIRATA3 (1. Department of Earth Sciences, Ibaraki University, 2. Kyoto Fission-Track Co., Ltd., 3. Geochemical Research Center, The University of Tokyo)
11:30 AM - 12:00 PM JST(2:30 AM - 3:00 AM UTC)

[T13-O-18][Invited]Basic studies on regional geology and stratigraphy of the Miocene Hokutan Group, Japan

*Toshiki HAJI1 (1. Geological Survey of Japan, AIST)
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