Jurassic and Cretaceous Radiolarians from the pre-Tertiary System in the Hidaka Belt, Maruseppu Region, Northeast Hokkaido

Iwata, Keiji; Tajika, Jun

北海道大学理学部紀要, 1989, 22(3), 453-466

Permalink : https://hdl.handle.net/2115/36759

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アクセス権	open access
URI	https://hdl.handle.net/2115/36759
タイトル	Jurassic and Cretaceous Radiolarians from the pre-Tertiary System in the Hidaka Belt, Maruseppu Region, Northeast Hokkaido
著者	著者名 Iwata, Keiji
著者	著者名 Tajika, Jun
言語	英語
発行日	1989-02
出版者	北海道大学
出版者	Hokkaido University
収録物名	北海道大学理学部紀要
収録物名	Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
巻(号)	22(3)
ページ	453-466
抄録	We have made a study of the pre-Tertiary Hidaka Supergroup (the Kanayama Formation), which is distributed at the most easterly portion of the Hidaka Belt, in order to ascertain the age of accumulation of this supergroup. The Kanayama Formation consists mainly of broken formations in which clastic rocks of terrigenous origin predominate and many exotic blocks are included in the scaly shale matrix. The tuffaceous shale of this format ion yielded Amphipyndax tylotus―Clathrocyclas diceros radiolarian assemblage which indicates late Campanian to early Maastrichtian age. And a late Jurassic Stylocapsa (?) spiralis and early Cretaceous Sethocapsa trachyostraca―Staurosphaera sepremporatus assemblages were obtained from chert block within the melange facies of the Kanayama Formation. This formation may represent a part of accretionary complex formed by subduction process during the late Cretaceous.
資源タイプ	紀要論文
出版タイプ	Version of Record
PISSN	0018-3474