北海道中央部, 中新統上杵臼層の珪藻化石年代(前期中新世末期)とその意義  [in Japanese] A latest Early Miocene diatom age of the Kamikineusu Formation, southern central Hokkaido, Japan, and its implications for geological history  [in Japanese]

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Abstract

Diatom assemblages indicative of the lower part of the Crucidenticula kanayae Zone were found in three carbonate concretions collected from the basal part of the Miocene Kamikineusu Formation in southern central Hokkaido. In spite of the fact that the formation has been correlated with the Middle Miocene Kawabata Formation in central Hokkaido on the basis of molluscan evidence, the diatom analysis clarified that the geologic age of the basal part of the formation is 16.9 to 16.7 Ma, latest Early Miocene. The new age data of the Kamikineusu Formation provides some geochronological constraints on the geological history in southern central Hokkaido. Firstly, in the southern part of the Hidaka belt, a part of the Hidaka Supergroup became exposed by an uplift by the latest Early Miocene. Secondly, a transgression occurred in the latest Early Miocene when the sedimentary basin of the Kamikineusu Formation was formed. Thirdly, at least the basal part of the Kamikineusu Formation is correlated with the Takinoue Formation in the Yubari district.

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 105(8), 589-592, 1999-08-15

    The Geological Society of Japan

References:  24

Cited by:  6

Codes

  • NII Article ID (NAID)
    110003013056
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00167630
  • NDL Article ID
    4841727
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-174
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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