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Vol.XXII, No.4 >

Radiolarian Age of the Manganese Deposits of the Tokoro Belt, Northeast Hokkaido

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Title: Radiolarian Age of the Manganese Deposits of the Tokoro Belt, Northeast Hokkaido
Authors: Iwata, Keiji Browse this author
Hariya, Yu Browse this author
Choi, Jai Ho Browse this author
Yagi, Eri Browse this author
Miura, Takeshi Browse this author
Issue Date: Aug-1990
Publisher: 北海道大学
Journal Title: 北海道大学理学部紀要
Journal Title(alt): Journal of the Faculty Science, Hokkaido University. Series 4, Geology and mineralogy
Volume: 22
Issue: 4
Start Page: 565
End Page: 576
Abstract: Radiolarian fossils of early Cretaceous (middle Barremian-early Aptian) were obtained from the country rock (bedded red chert) of the manganese deposit of the Hinode mine in the Tokoro Belt. By this discovery of radiolarians the geological age of the formation of the manganese deposit of the Hinode mine was determined for the first time to be formed during a short period of ca. 110-120 Ma. Radiolarian fossils of early Cretaceous in age were also extracted from bedded cherts of the Wakasa, Koryu, Syotosibetu, and Hokkaido mines which were similar manganese deposits to the Hinode mine. This fact suggests that manganese deposits in the Tokoro Belt were formed almost simultaneously during late early Cretaceous time.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/36766
Appears in Collections:Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XXII, No.4

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