The 132nd Annual Meeting of the Geological Society of Japan
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Session OralT12 ［Topic Session］History of EarthEDI

[2oral501-09]T2. History of Earth

Mon. Sep 15, 2025 9:00 AM - 12:00 PM JST
Mon. Sep 15, 2025 12:00 AM - 3:00 AM UTC
oral room 5(E205)
Chiar:Daisuke KUWANO(Kyoto University), Kento MOTOMURA(Kyushu Univ.), Yuki TOMIMATSU(Fukuoka University)
9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)ECS

[T12-O-11]Middle Miocene ostracode assemblages from the Ôanzaigawa Formation, Kaminokuni Town, Hokkaido, Japan and its significance.

*Mukai Kazumasa1, Yamada Toshihiro2, Tanaka Gengo3 (1. Hokkaido University, 2. Hokkaido University Science, 3. Kumamoto University)
9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)ECS

[T12-O-12]Preliminary report on the paleoenvironmental reconstruction from the Miocene Shimonita Formation along the Kabura River, Shimonita Town, Gunma Prefecture, central Japan.

*Satoshi SASAKI1, Kosuke HATSUGAI1, Akihide KIKUKAWA2, Yuji TAKAKUWA3, Koji SETO4 (1. Gunma University, 2. Natural History Museum and Institute, Chiba, 3. Gunma Museum of Natural History, 4. Shimane University)
9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[T12-O-13]Permian fusuline fauna of the Sibumasu Block in mainland SE Asia and its paleobiogeographic interpretation

*Katsumi UENO1, Thasinee Charoentitirat2 (1. Department of Earth System Science, Faculty of Science, Fukuoka University, 2. Department of Geology, Faculty of Science, Chulalongkorn University (Thailand))
9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[T12-O-14]Secular change of seawater composition through geologic time estimated from Independent Component Analysis

*Tsuyoshi Komiya1 (1. The University of Tokyo)
10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)ECS

[T12-O-15]The composition of bio-essential trace elements in the Eoarchean seawater estimated from the carbonate rocks of the Isua supracrustal belt, SW Greenland

*Satoshi Yoshida1,2, Tsuyoshi Komiya2 (1. Japan Aerospace Exploration Agency, 2. Department of Earth Science and Astronomy, The University of Tokyo)
10:15 AM - 10:45 AM JST(1:15 AM - 1:45 AM UTC)

[2oral501-09-6add]Break

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)entryECS

[T12-O-16]Investigation of a Ladinian (Middle Triassic) Humid Event in Bedded Cherts of the Mino and Northern Kitakami Belts

*Takuma Shiohara1,2, Shun Muto2, Tetsuji Onoue3 (1. Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, 2. Geological Survey of Japan, AIST, 3. Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University)
11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)entryECS

[T12-O-17]Terrestrial and marine paleoecology of the Middle Paleocene: Insights from biomarker analysis of the Nemuro Group

*Tatsuya Yoshida1, Hideto Nakamura2, Keiichi Hayashi3, Masashi Ikeda1, Takuto Ando4 (1. Hokkaido university, 2. Fukui prefectural university, 3. Hokkaido research organization, 4. Akita university)
11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)entryECS

[T12-O-18]Provenance study of zircon in river sands based on the trace element composition: a case study for the Ryoke granitic rocks exposed in the Mikawa area of central Japan.

*Yuga HIRAI1, Hisashi ASANUMA1, Yusuke SAWAKI2, Tetsu KOGISO1 (1. Kyoto Univ., 2. Tokyo Univ.)
11:30 AM - 12:00 PM JST(2:30 AM - 3:00 AM UTC)Highlight

[T12-O-19][Invited] Constraining the timing of Ontong Java eruptions using the Cretaceous sedimentary sequence

*Hironao MATSUMOTO1 (1. Institute of Life and Environmental Sciences, University of Tsukuba)
【ハイライト講演】  巨大火山噴火は気候や生態系に甚大な影響を及ぼし、地球史における主要な環境変動の要因となってきた。松本廣直氏は、白亜紀における世界最大級の火山活動の産物であるオントンジャワ海台の噴火史と、それに伴う地球表層環境変動との因果関係を同位体地球化学的に精査し、関係解明に大きく貢献してきた気鋭の若手研究者である。本講演では、堆積岩に刻まれた記録を通じて、大規模火山活動が環境に及ぼす影響の最新成果が示される。 ※ハイライト講演とは．．．
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