JpGU-AGU Joint Meeting 2017

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[JJ] Oral

H (Human Geosciences) » H-QR Quaternary research

[H-QR05] [JJ] Diachronic dynamics of human-environment interactions

Thu. May 25, 2017 9:00 AM - 10:30 AM 106 (International Conference Hall 1F)

convener:Toshihiko Sugai(Department of Natural Environmental Studies, Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo), Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Kiyohide Mizuno(Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology), Minoru YONEDA(The University Museum, The University of Tokyo), Chairperson:Toshihiko Sugai(Department of Natural Environmental Studies, Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo), Chairperson:Kiyohide Mizuno(Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology)

9:30 AM - 9:45 AM

[HQR05-03] Environmental change from diatom analysis since MIS7~MIS8 in the Omoikawa lowland, the Kanto plain

*Marie Noguchi1, Toshihiko Sugai2, Shigeko Ishiwata, Kunihiko Endo3 (1.Paleo Labo co.,ltd., 2.Tokyo Univ., 3.Nihon Univ.)

Keywords:diatom analysis, Omoikawa

Omoikawa core( N36°14’51.19” E139°41’59.4”, 14.75m above sea level) was taken from the Omoikawa lowland ,located just the northern side of Watarase Basin.
The core, 60 m long, is composed of 3 sand and mud layers (A,C,E) and 3 gravel layers (B,D,F), as A to F from the top to the bottom.
From Unit A, two 14C ages in Holocene were obtained. Diatom analysis for Unit A indicated freshwater environment.
Diatom analyses for Unit C showed mainly inner bay environment, along with marine to brackish tidal environments. It is supported by sulfur analysis. Unit C is probably correlated to MIS5e.
Unit D, gravel layer below Unit C, may be MIS6.