Late Pleistocene Tephrostratigraphy of Marine Core off Joetsu, Japan

Yuya NAKAMURA; Toshihiko SUGAI; Takeshi ISHIHARA; Antonio Fernando FREIRE; Ryo MATSUMOTO

doi:10.14866/ajg.2012s.0_100099

Annual Meeting of the Association of Japanese Geographers, Spring 2012

Session ID : 606

DOI https://doi.org/10.14866/ajg.2012s.0_100099

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Host: The Association of Japanese Geographers

Abstract

Late Pleistocene Tephrostratigraphy of Marine Core off Joetsu, Japan

*Yuya NAKAMURA, Toshihiko SUGAI, Takeshi ISHIHARA, Antonio Fernando FREIRE, Ryo MATSUMOTO

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Keywords: Tephra, Japan Sea, Late Pleistocene, SEM-EDS

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Abstract

The piston cores and gravity cores from off Joetsu in the southeast Japan Sea contain widespread tephras from distal volcanoes in the Kyushu, Chugoku, Chubu, and Hokkaido area. On the basis of the stratigraphy, petrography, and chemical composition of volcanic glass shards measured by microprobe analyzer (SEM-EDS; JEOL JSM-6390LA), tephras can be correlated to the As-K, AT, DKP, On-Ng, Aso-4, On-Kt, K-Tz, SK, Toya in descending order.

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