Japan Geoscience Union Meeting 2015

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Symbol H (Human Geosciences) » H-CG Complex & General

[H-CG35] Interdisciplinary approach to earth's changing surface

Wed. May 27, 2015 9:15 AM - 10:45 AM 105 (1F)

Convener:*Naofumi Yamaguchi(Center for Water Environment Studies, Ibaraki University), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Koji Seike(Atmosphere and Ocean Research Institute, University of Tokyo), Hideko Takayanagi(Institute of Geology and Paleontology, Graduate School of Science, Tohoku University), Masayuki Ikeda(Shizuoka University), Chair:Naofumi Yamaguchi(Center for Water Environment Studies, Ibaraki University)

10:00 AM - 10:15 AM

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[HCG35-04] Grain and chemical composition of coastal sand in Kanto and adjacent region

*Hiroshi HAGIYA1, Atsuko ISHII2, Masayuki SEKI1, Ayumi HORI1 (1.Tokyo City University, 2.Toppan Printing Co. Ltd.)

Keywords:beach sand, grain composition, chemical composition, trace element, tectnic setting, erosion

Grain composition and chemical composition of beach sand, over 200 samples collected from Southern Abukuma region, Choshi region, Kujukuri region, Shonan region and West Suruga-Bay region, had analysed.
The composition of sand had wide variety in Kanto and adjacent region, and also show areal differences in each coast, caused by sand supply from river system and coastal current differenciation.
Rock fragment dominates in both Shonan and West Suruga-Bay coast, but Shona sand consist of mainly volcaniclastic fragment, while West Suruga-Bay sand consist of sedimentary rocks origin fragment, which made in accretionary process in subduction zone. Trace element composition shows also differences between two coast in sand grain origin.
We will discuss about the importance of grain and chemical composition analysis of recent coastal sands, not only in the field of coastal engineering, but also in earth science, in the context of tectonic setting analysis of geological time scale.