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)Highlightentry

[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)
【ハイライト講演】  東北日本の中期中新世は引張場と圧縮場が共存したリフト・ポストリフト遷移期であり，背弧海盆火山活動から島弧火山活動へ移行した時期でもある．この研究では佐井地域の地質踏査にもとづく地質図をベースに，火山岩の年代測定・全岩化学分析結果に基づいて引張テクトニクスの継続時期やマグマ成因について議論する． ※ハイライト講演とは．．．
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)Highlightentry

[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)
【ハイライト講演】  東北日本弧は島弧火山活動期（13.5 Ma以降）のカルデラの宝庫である．この研究は下北カルデラ群を例に地質踏査による産状観察，岩石学的記載・年代測定にもとづいて，複合カルデラの複雑な層序関係の実態・形成史を明らかにするものである ※ハイライト講演とは．．．
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)Highlight

[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)
【ハイライト講演】  山陰地域は前世紀後半以降，研究の進展が乏しい典型的な日本のフィールド事情を示す地域である．羽地氏は同地域において約10年間にわたり稠密な野外調査を実施し，小地域の研究成果を着実に積み重ねるとともに，それらの成果を基に前世紀末に提示された堆積盆発達史の精緻化を目指している．本講演では，今後のフィールド研究のモデルとなることを期待し，羽地氏の山陰地域における研究事例を紹介いただく． ※ハイライト講演とは．．．
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