[S-GL19] Frontier research on chronostratigraphic unit boundaries

Tue. May 28, 2024 10:45 AM - 12:00 PM 202 (International Conference Hall, Makuhari Messe)

convener:Hiroyuki Hoshi(Aichi University of Education), Reishi Takashima(Tohoku University Museum, Tohoku University), Junichiro Kuroda(Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, the University of Tokyo), Makoto Okada(Department of Earth Sciences, College of Science, Ibaraki University), Chairperson:Reishi Takashima(Tohoku University Museum, Tohoku University), Hiroyuki Hoshi(Aichi University of Education)

This session aims to share the current knowledge on stratigraphy, geochronology, geochemistry, paleoclimatology, and paleoceanography at or around chronostratigraphic unit boundaries. Geological studies dealing with chronostratigraphic unit boundaries, such as the Permian-Triassic (P-T) and Cretaceous-Paleogene (K-Pg) boundaries, as well as boundaries between systems (periods), series (epochs), stages (ages), and other chronozones (chrons) are welcome. We also welcome studies on global events such as oceanic anoxic events (OAEs), asteroid impacts, and geomagnetic reversals, as well as the lithostratigraphy, tephrostratigraphy, sequence stratigraphy, biostratigraphy, chemostratigraphy, magnetostratigraphy, radiometric dating, tectonics, etc. of rock sequences above or below the chronostratigraphic unit boundaries in Japan and elsewhere.

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10:45 AM - 11:00 AM

[SGL19-01] Astrochronology and radiometric ages for orbital-scale dynamics across the geologic stage boundaries

★Invited Papers

*Masayuki Ikeda¹, Nodoka Kuramoto¹, Aki Sakuma¹, Mizuki Tojima¹, Sota Niki¹, Hiroki Kamikura¹, Rio Miyata¹, Kentaro Izumi² (1.University of Tokyo, 2.Chiba University)

11:00 AM - 11:15 AM

[SGL19-02] Reconstruction of the Cretaceous continental arc–trench system of the Japanese Islands: Cretaceous stratigraphic correlation for Cretaceous palaeoenvironmental studies

*Hisao Ando¹ (1.Department of Earth Sciences, College of Science, Ibaraki University)

11:15 AM - 11:30 AM

[SGL19-03] Age and duration of the Aptian OAE1a determined by integrated carbon, osmium isotope, and planktonic foraminiferal stratigraphy and U-Pb dating in the Yezo Group, Hokkaido.

*Reishi Takashima¹, Li Youjuan², Bradley S. Singer², Mark Schmitz⁴, Luca Podrecca⁵, Bradley B Sageman⁵, David Selby³, Toshiro Yamanaka⁷, Michael T. Mohr⁴, Keiichi Hayashi⁶, Taiga Tomaru¹, Katarina Savatic⁵ (1.Tohoku University, 2.Wisconsin University, 3.Durham Univeristy, 4.Boise State University, 5.Northwestern University, 6.Hokkaido Research Organization, 7.Tokyo University of Marine Science and Technology)

11:30 AM - 11:45 AM

[SGL19-04] Osmium isotopic records and abundances of platinum group elements of the Cretaceous-Paleogene boundary in the Nemuro Group

*Hayu Ota¹, Junichiro Kuroda¹, Reishi Takashima², Hiroyuki Hoshi³, Ken Sawada⁴, Masashi A. Ikeda⁴, Keiichi Hayashi⁵, Hiroshi Nishi⁶, Akira Ishikawa⁷ (1.Atmosphere and Ocean Research Institute, the University of Tokyo, 2. The Center for Academic Resources and Archives, Tohoku University Museum, 3.Department of Earth Sciences, Aichi University of Education, 4.Department of Earth and Planetary Sciences, Hokkaido University, 5.Research Institute of Energy, Environmental and Geology, Hokkaido Research Organization, 6.Dinosaurs Research Institute, Fukui Prefectural University, 7.Department of Earth and Planetary Sciences, Tokyo institute of Technology)

11:45 AM - 12:00 PM

[SGL19-05] A geomagnetic excursion detected at the lower Matuyama reversed polarity chronozone in a marine Pleistocene sequence distributed in the southernmost Boso Peninsula

*Makoto Okada¹, Go Maeda¹, Daiki Kotsuka¹, Takumi Konishi¹ (1.Department of Earth Sciences, College of Science, Ibaraki University)

Session information