Diatoms of the mudstone samples collected from the canyon wall of the Kushiro Submarine Canyon, northern Japan

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  • Yanagisawa Yukio
    AIST, Geological Survey of Japan, Institute of Geology and Geoinformation

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  • 釧路海底谷側壁から採取された泥岩試料の珪藻化石
  • クシロ カイテイダニ ソクヘキ カラ サイシュ サレタ デイガン シリョウ ノ ケイソウ カセキ

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Description

    Diatoms were examined from 12 mudstone samples collected by dive surveys of the submersible “Shinkai 6500” conducted in 2006 on the sidewall in the Kushiro Submarine Canyon, off Tokachi, Hokkaido. Diatom assemblages from the samples at the upper reaches are correlative with the lower part of zone NPD8 (early late Pliocene) to the lower part of zone NPD10 (early Pleistocene). At the lower reaches, early Pleistocene diatoms placed to upper zone NPD10 occur in semiconsolidated mudstone of slope sediments. On the other hand, the deformed mudstone samples collected at the outer high region contain poorly preserved diatoms correlated to zone NPD4Ba (middle Miocene), zone NPD2B (early Miocene) and the Roccela gelida Zone (latest Oligocene).

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