Widespread tephras in sediments from lake Ichi-no-Megata in northern Japan: Their description, correlation and significance

Mitsuru Okuno, Masayuki Torii, Kazuyoshi Yamada, Yoshitsugu Shinozuka, Tohru Danhara, Katsuya Gotanda, Hitoshi Yonenobu, Yoshinori Yasuda

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Lake Ichi-no-Megata is a maar in the Oga Peninsula, which is connected with the western side of Honshu Island, NE Japan. A 37-m long sediment core (IMG06) obtained from the center of the lake contains five fine ash layers. Stratigraphic positions in the core provide ages of five ashes to be 30, 21, 17, 7.3, and 1.0 cal ka BP, respectively. These layers are correlated with Aira-Tn (AT), Daisen-Kusatanihara (D-KsP), Asama-Kusatsu (As-K), Kikai-Akahoya (K-Ah) and Baitoushan-Tomakomai (B-Tm) tephras in ascending order, based on stratigraphy and petrographic characteristics such as grain assemblages, refractive indices, and major element compositions of glass shards. Although the AT, K-Ah and B-Tm tephras have been well known as widespread tephras, this study finds that the D-KsP, As-K and K-Ah tephras have more extensive distributions than the previous studies estimated. The D-KsP and As-K tephras have the potential to become useful time-markers in and around the Sea of Japan between the AT and K-Ah tephras.

本文言語English
ページ(範囲)270-277
ページ数8
ジャーナルQuaternary International
246
1-2
DOI
出版ステータスPublished - 2011 12 20
外部発表はい

ASJC Scopus subject areas

  • Earth-Surface Processes

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