Japan Geoscience Union Meeting 2018

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[JJ] Oral

H (Human Geosciences) » H-QR Quaternary research

[H-QR04] Quaternary, Diachronic dynamics of human-environment interactions

Sun. May 20, 2018 1:45 PM - 3:15 PM A08 (Tokyo Bay Makuhari Hall)

convener:Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Toshihiko Sugai(Department of Natural Environmental Studies, Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo), Kiyohide Mizuno(国立研究開発法人産業技術総合研究所地質情報研究部門, 共同), Minoru YONEDA(The University Museum, The University of Tokyo), Chairperson:Mizuno Kiyohide, Aoki Kaori

3:00 PM - 3:15 PM

[HQR04-11] Age of an early Pleistocene tephra detected in the upper part of Sayama Formation, Sayama Hills, Kanto Plain: correlation of Zoshki tephra with Akatsuka A10 tephra and Byobugaura Ob5.1 tephra

*Takehiko Suzuki1, Tohru Fukushima2, Izumi Taura (Fukushima) (1.Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 2.Musashino School of Paleontology)

Keywords:Sayama Formation, Zoshki tephra, early Pleistocene

We described an early Pleistocene tephra detected in the upper part of Sayama Formation, Sayama Hills, Kanto Plain, Northeast Japan. The age of Zoshki tephra has not been well discussed although its fission track age of 1.4±0.2 Ma was obtained by previous study. In this study, we correlated this tephra with Akatsuka A10 tephra and Byobugaura Ob5.1 tephra. Age of Ob5.1 determined to be 1.182–1.219 Ma indicates the age of the upper part of Sayama Formation is around 1.2 Ma.