[B-CG06] Decoding the history of Earth: From Hadean to the present

Wed. May 28, 2025 3:30 PM - 5:00 PM 301A (International Conference Hall, Makuhari Messe)

convener:Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo), Fumito Shiraishi(Earth and Planetary Systems Science Program, Graduate School of Advanced Science and Engineering, Hiroshima University), Yusuke Sawaki(The University of Tokyo), Teruhiko Kashiwabara(Japan Agency for Marine-Earth Science and Technology), Chairperson:Satoshi Yoshida(Center for Northeast Asian Studies, Tohoku University), Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo)

The latest results of Earth's evolution and geological processes through 4.6 billion years from Hadean to Modern, based on various approaches including fieldworks, chemical analyses, experiments and computer simulation, will be presented. In this session, we aim to discuss and understand causal relationships and interplay among the evolution of Earth's deep interior, changes in the surface environments, and development and evolution of life. Wide-ranging topics are accepted.

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3:30 PM - 3:45 PM

[BCG06-19] Investigation of a trigger for the mid-Ordovician ice age using helium isotopes: Evidence of an increased influx of extraterrestrial material

*Naoto Takahata¹, Birger Schmitz², Shiyong Liao³, Yukio Isozaki⁴ (1.AORI, Univ. Tokyo, 2.Lund Univ., Sweden, 3.CAS, China, 4.Grad. Arts Sci., Univ. Tokyo)

3:45 PM - 4:00 PM

[BCG06-20] Paleoecological reconstruction by molecular fossil analysis of sedimentary rocks deposited across the Devonian-Carboniferous boundary in northeastern Vietnam

*Risa Shigi¹, Reishi Takashima², Toshifumi Komatsu³, Ken Sawada⁴ (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University, 2.The Center for Academic Resources and Archives, The Tohoku University Museum, Tohoku University, 3.Faculty of Advanced Science and Technology, Division of Natural Science, Kumamoto University, 4.Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University)

4:00 PM - 4:15 PM

[BCG06-21] Paleozoic subduction tectonics of the Mongol-Okhotsk Ocean: Detrital zircon ages and basalt geochemistry of the Gorkhi Formation, central Mongolia

*Tomohiko Sato¹, Kazumasa Aoki¹, Jargalsaikhan Batsukh², Khishigjav Tsogtbaatar² (1.Center for Fundamental Education, Okayama University of Science, 2.Institute of Paleontology, Mongolian Academy of Sciences)

4:15 PM - 4:30 PM

[BCG06-22] Paleoenvironmental variations recorded by molecular fossils in sedimentary rocks deposited across the Cretaceous/Paleogene boundary in the Nemuro Group, Hokkaido, Japan

*Ritomi Kinoshita¹, Masashi A. Ikeda², Ken Sawada¹, Keiichi Hayashi³, Hayu Ota⁴, Junichiro Kuroda⁴, Hiroyuki Hoshi⁵, Reishi Takashima⁶, Hiroshi Nishi⁷ (1.Faculty of Science, Hokkaido University, 2.Kanazawa University, 3.Hokkaido Research Organization (HRO), 4.Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, the University of Tokyo, 5.Aichi University of Education, 6.The Tohoku University Museum, Tohoku University, 7.Institute of Dinosaur Res., Fukui Prefectural University)

4:30 PM - 4:45 PM

[BCG06-23] Drivers of the K-Pg mass extinction: impact and volcanism interaction

*Kunio Kaiho¹, Jeroen E. Sonke², Akane Yamakawa³, David Jones⁴, Satoshi Takahashi⁵, Masanobu Yamamoto⁶, Naga Oshima⁷, Laure Laffont², Stephen E. Grasbyi⁸ (1.Tohoku University, 2.Université Paul Sabatier Toulouse 3, 3.National Institute for Environmental Studies, 4.Amherst College, 5.Nagoya University, 6.Hokkaido University, 7.Meteorological Research Institute, 8.University of Calgary)

4:45 PM - 5:00 PM

[BCG06-24] Paleoenvironmental reconstruction using chalcophile element compositions in the Cretaceous–Paleogene boundary clays

*Teruyuki Maruoka¹, Yoshiro Nishio² (1.Faculty of Life and Environmental Sciences, University of Tsukuba, 2.Faculty of Agriculture and Marine Science, Kochi University)

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