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

[1oral501-10]T2. History of Earth

Sun. Sep 14, 2025 9:00 AM - 12:00 PM JST
Sun. Sep 14, 2025 12:00 AM - 3:00 AM UTC
oral room 5(E205)
Chiar:Kazuhide MIMURA(National Institute of Advanced Industrial Science and Technology), Satoshi SASAKI(Gunma University), Daisuke KUWANO(Kyoto University)
9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)ECS

[T12-O-1]Detection and significance of geomagnetic excursions in the marine Pliocene successions at the southernmost part of the Boso Peninsula, central Japan.

*Akihiro TANIMOTO1, Makoto Okada1 (1. Department of Earth Science, Ibaraki University)
9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[T12-O-2]Reconstructing ice sheets during the last glacial cycle with relative sea level data

*Evan James GOWAN1,2, Anna Hughes3, Richard Gyllencreutz4, Jan Mangerud5, John Inge Svendsen5, Jo Brendryen5, Riccardo Riva6 (1. Kumamoto University, 2. Prefectural University of Kumamoto, 3. University of Manchester, 4. Stockholm University, 5. University of Bergen, 6. Delft University of Technology)
9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[T12-O-3]Extracting data structure from microfossil images using machine learning: Toward development of data-driven ichthyolith biostratigraphy

*Kazuhide Mimura1, Kentaro Nakamura2,3, Kazutaka Yasukawa2 (1. National Institute of Advanced Industrial Science and Technology, 2. Univ. Tokyo, 3. Chiba Institute of Technology)
9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[T12-O-4]Linkage between the transient oxygenation of the ocean-atmosphere system and the intence volcanism during the mid-Proterozoic

*Kazumi OZAKI1, Yasuto WATANABE2 (1. Institute of Science Tokyo, 2. National Institute for Environmental Studies)
10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)ECS

[T12-O-5]Nitrogen cycling in the Paleoarchean ocean: Insights from nitrogen isotope signatures of the ca. 3.25 Ga Mapepe Formation, Barberton Greenstone Belt

*Kento MOTOMURA1, Takashi SANO2, Shoichi KIYOKAWA1 (1. Kyushu Univ., 2. National Museum of Nature and Science)
10:15 AM - 10:45 AM JST(1:15 AM - 1:45 AM UTC)

[1oral501-10-6add]Break

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

[T12-O-6]High-resolution reconstruction of the Early Pleistocene paleoenvironment of NW Pacific based on Multiproxy analysis

*Yoshihiro ISHII1, Masayuki UTSUNOMIYA2, Yuki HANEDA2, Mutsuko INUI3, Kentaro IZUMI1 (1. Chiba Univ., 2. Geological Survey of Japan, AIST, 3. Kokushikan Univ.)
11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)entry

[T12-O-7]Sea-surface environmental changes of the Japan Sea coastal area revealed by alkenones from the lower-Pleistocene Omma Formation

*Retsu Nishiyama1, Akihisa Kitamura2, Takashi Hasegawa1 (1. Kanazawa University, 2. Shizuoka University)
11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)entry

[T12-O-8]Paleoenvironmental reconstruction of low-latitude pelagic deep-sea during the Early Triassic Smithian-Spathian transition

*Kazuki MATSUI1, Satoshi TAKAHASHI1, Shunta ICHIMURA1, Shun MUTO2, Satoshi YAMAKITA3 (1. Graduate School of Environmental Studies, Nagoya University, 2. National Institute of Advanced Industrial Science and Technology, 3. Faculty of Education, University of Miyazaki)
11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)entryECS

[T12-O-9]Osmium Isotope Stratigraphy around the Aptian–Albian Boundary in the lower Cretaceous Sanchu Group, Central Japan

*Yui TSUKADA1, Shigehiro FUJINO1, Hironao MATSUMOTO1, Katsuhiko SUZUKI2 (1. University of Tsukuba, 2. JAMSTEC)
11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)entryECS

[T12-O-10]Seawater Osmium isotopic record during the Deccan flood basalt eruption event in the Indian Ocean

*Hayu OTA1, Junichiro KURODA1, Maria Luisa Tejada2, Katsuhiko SUZUKI2, Yusuke KUBO3, Akira ISHIKAWA4 (1. Atmosphere and Ocean Research Institute, the University of Tokyo, 2. Japan Agency for Marine-Earth Science and Technology, 3. Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 4. Department of Earth and Planetary Sciences, Institute of Science Tokyo)
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