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

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)270-277
    Number of pages8
    JournalQuaternary International
    Volume246
    Issue number1-2
    DOIs
    Publication statusPublished - 2011 Dec 20

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    ash
    maar
    lake
    refractive index
    sediment
    sediment core
    stratigraphy
    glass
    sea
    marker
    distribution

    ASJC Scopus subject areas

    • Earth-Surface Processes

    Cite this

    Widespread tephras in sediments from lake Ichi-no-Megata in northern Japan : Their description, correlation and significance. / Okuno, Mitsuru; Torii, Masayuki; Yamada, Kazuyoshi; Shinozuka, Yoshitsugu; Danhara, Tohru; Gotanda, Katsuya; Yonenobu, Hitoshi; Yasuda, Yoshinori.

    In: Quaternary International, Vol. 246, No. 1-2, 20.12.2011, p. 270-277.

    Research output: Contribution to journalArticle

    Okuno, M, Torii, M, Yamada, K, Shinozuka, Y, Danhara, T, Gotanda, K, Yonenobu, H & Yasuda, Y 2011, 'Widespread tephras in sediments from lake Ichi-no-Megata in northern Japan: Their description, correlation and significance', Quaternary International, vol. 246, no. 1-2, pp. 270-277. https://doi.org/10.1016/j.quaint.2011.08.015
    Okuno, Mitsuru ; Torii, Masayuki ; Yamada, Kazuyoshi ; Shinozuka, Yoshitsugu ; Danhara, Tohru ; Gotanda, Katsuya ; Yonenobu, Hitoshi ; Yasuda, Yoshinori. / Widespread tephras in sediments from lake Ichi-no-Megata in northern Japan : Their description, correlation and significance. In: Quaternary International. 2011 ; Vol. 246, No. 1-2. pp. 270-277.
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