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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy >
Vol.XXII, No.4 >
Radiolarian Age of the Manganese Deposits of the Tokoro Belt, Northeast Hokkaido
| 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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