2024-03-28T10:24:01Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00003235
2022-12-15T03:36:22Z
176:488:489
453:454
Tectonic implications of Early Eocene dinoflagellate cysts from the Mukai-engaru Formation of the Yubetsu Group, Tokoro Belt, eastern Hokkaido, Japan
北海道東部、常呂帯湧別層群向遠軽層の渦鞭毛藻化石年代(前期始新世)とその意義
北海道東部、常呂帯湧別層群向遠軽層の渦鞭毛藻化石年代(前期始新世)とその意義
栗田, 裕司
41603
田近, 淳
41604
Hokkaido
Tokoro Belt
Yubetsu Group
dinoflagellate cysts
Eocene
A diverse marine dinoflagellate cyst assemblage of an Early Eocene age was recovered from the Mukai-engaru Formation of the Yubetsu Group, Tokoro Belt, eastern Hokkaido, Japan, from which no fossil occurrence was previously recorded. The Early Eocene age is the youngest known age of the group and provides two geochronological constraints significant to the regional tectonic history. First, the age of the formation agrees well with the accretionary prism model proposed for the Yubetsu Group, since the age was determined in the probable youngest part of the whole group in the model. Second, the present age determination denotes that the eastward accretion-subduction to the Paleo-Kuril Arc or the Okhotsk Block was still active in the Early Eocene. The observed geochronological range of the Yubetsu Group is well paralleled by that of the Hidaka Supergroup in the Hidaka Belt to the west, which implies a temporal similarity between the two confronting convergent margins.
journal article
日本地質学会
1998-11
application/pdf
地質学雑誌
11
104
808
811
地質学雑誌
AN00141768
00167630
https://niigata-u.repo.nii.ac.jp/record/3235/files/ZC_104(11)_808-811.pdf
jpn