The 132nd Annual Meeting of the Geological Society of Japan
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Session OralT6 ［Topic Session］A new geotectonic unit in central Ryukyu: characteristics and research scope of the Tokunoshima belt

[1oral701-06]T6. A new geotectonic unit in central Ryukyu: characteristics and research scope of the Tokunoshima belt

Sun. Sep 14, 2025 10:00 AM - 12:00 PM JST
Sun. Sep 14, 2025 1:00 AM - 3:00 AM UTC
oral room 7(C301)
Chiar:Yukio ISOZAKI(Dept. Earth Sci. & Astron. Univ. Tokyo), Yukiyasu TSUTSUMI(Department of Science, National Museum of Nature and Science), Hiroshi YAMAMOTO(Graduate School of Science and Engineering, Kagoshima University)
10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[T6-O-1]Petrographical and structural aspects of a newly recognized amphibolite-facies metamorphic belt (Tokunoshima belt) in Central Ryukyus, Japan.

*Hiroshi YAMAMOTO1, Yukio ISOZAKI2, Yukiyasu TSUTSUMI3 (1. Graduate School of Science and Engineering, Kagoshima University, 2. Graduate school of Arts and Sciences, University of Tokyo, 3. Department of Geology and Paleontology, National Museum of Nature and Science)
10:15 AM - 10:45 AM JST(1:15 AM - 1:45 AM UTC)Highlight

[T6-O-2][Invited] Metamorphic texture and history of amphibolites in the Tokunoshima belt in central Ryukyus

*Masaoki UNO1, Hiroshi YAMAMOTO2, Yukio ISOZAKI3 (1. Dept. Earth, Planet. Sci., Univ. Tokyo, 2. Graduate School of Science and Engineering, Kagoshima Univ., 3. Dept. Earth Sci. & Astron. Univ. Tokyo)
【ハイライト講演】  徳之島では, 四万十付加体の構造上位に低圧高温型広域変成岩類が累重するが, それらの形成条件の詳細は明らかになっていない.  宇野氏は, 変成作用の解析手法について新たな視点から挑戦され, 流体反応の物理化学プロセスの実態に迫る研究を推進されている. その手法を徳之島のマフィック変成岩（角閃岩）に応用して得られた温度圧力条件などについてご講演いただく． ※ハイライト講演とは．．．
10:45 AM - 11:15 AM JST(1:45 AM - 2:15 AM UTC)Highlight

[T6-O-3][Invited] Dynamics of the Tanzawa Metamorphic Rocks Inferred from the Pressure–Temperature Paths of Amphibole

*Tatsu KUWATANI1, Mitsuhiro TORIUMI1 (1. JAMSTEC)
【ハイライト講演】  桑谷氏は、変成作用の累進的脱水作用一般について研究され, 丹沢変成帯についても成果をあげておられる. 本セッションでは, 井之川岳変成複合体（徳之島帯）の変成岩類構成と類似した特徴を有する丹沢変成帯についての最新の研究成果を講演していただく. 本講演は, 徳之島帯の帰属について重要な示唆を与えるものと期待される.  ※ハイライト講演とは．．．
11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[T6-O-4]Reevaluation of phengite K-Ar ages from the Nagasaki metamorphic rocks in the Nomo Peninsula

*Kazumasa Aoki1, Shota Kodaira2, Koshi Yagi3, Taisei Fujiwara3, Ikuo Okada3 (1. Okayama University of Science, 2. Nagasaki City Dinosaur Museum, 3. Hiruzen Institute for Geology and Chronology Co., Ltd.)
11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[T6-O-5]Dating of detrital zircon grains from geologic units in the Tokunoshima Island, central Ryukyu Arc, Japan.

*Yukiyasu TSUTSUMI1, Hiroshi YAMAMOTO2, Yukio ISOZAKI3 (1. Department of Science, National Museum of Nature and Science, 2. Graduate School of Science and Engineering, Kagoshima University, 3. Graduate school of Arts and Sciences, University of Tokyo)
11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[T6-O-6]The origin and formation tectonics of high-grade metamorphics of the Tokunoshima belt in central Ryukyus

*Yukio ISOZAKI1, Hiroshi YAMAMOTO2, Yukiyasu TSUTSUMI3, Ken-ichiro TANI3 (1. Dept. Earth Sci. & Astron. Univ. Tokyo, 2. Graduate School of Science and Engineering, Kagoshima Univ., 3. Dept. Geology, National Museum of Nature & Science Tokyo)
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