1987 Fiscal Year Final Research Report Summary
Re-examination on the Hidaka Supergroup distributed in the Axial Zone of Hokkaido
| Project/Area Number |
60302029
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
地質学一般
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| Research Institution | Hokkaido University |
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Principal Investigator |
UOZUMI Satoru Faculty of Science, Hokkaido University, 理学部, 教授 (20000763)
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| Co-Investigator(Kenkyū-buntansha) |
IWATA Keiji Faculty of Science, Hokkaido University, 理学部, 助手 (60002226)
KIMURA Gaku Faculty of Education, Kagawa University, 教育学部, 助教授 (80153188)
KIMINAMI Kazuo Faculty of Science, Yamaguchi University, 理学部, 助教授 (20127757)
OKADA Hakuyu Faculty of Science, Shizuoka University, 理学部, 教授 (60037182)
NAKAMURA Koji Faculty of Science, Hokkaido University, 理学部, 教授 (40000822)
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| Project Period (FY) |
1985 – 1987
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| Keywords | Hidaka Supergroup / Axial Zone of Hokkaido / Cretaceous System / 付加体 / ジュラ系 / 常呂帯 / オホーツク古陸 |
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| Research Abstract |
The Hidaka Supergroup is an age-unknown pre-Tertiary System which is widely distributed in the Axial Zone of Hokkaido. This supergroup has been regarded for a long time as a geosynclinal deposit which is precursor of Hidaka Orogeny and ranged from late Paleozoic to Jurassic age.
In order to examine the geological age, stratigraphy, sedimentary environment,geological development of this supergroup (including other pre-Tertiary Systems in the Tokoro Belt and the Sorachi-Yezo Belt), we organized a project team which consisted of stratigraphers, paleontologists, sedimentologists, and structural geologists. From results of the research project for these three years, the following conclusions have been obtained: The Hidaka Supergroup does belong to neither Jurassic nor Paleozoic System, but to Cretaceous System. This supergroup shows locally a melange facies in which exotic blocks of Permian, Triassic, Jurassic, and early early Cretaceous ages are included in Cretaceous pelitic matrices in a chaotic manner. The Hidaka Supergroup is proved to be accertionary complex which was formed at the convergent margin along the Eurasian Plate during Cretaceous Period.
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