1986 Fiscal Year Final Research Report Summary
Paleontologic and Sedimentologic Investigation of Mesozoic Radiolarian Rocks in the Northern Mino Terrane.
| Project/Area Number |
59460044
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | Fukui University |
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Principal Investigator |
HATTORI Isamu Faculty of Education, Fukui University, 教育学部, 助教授 (60020111)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJIMA Tadashi Faculty of Education, Fukui University, 教育学部, 助教授 (70093440)
MIURA Shizuka Faculty of Education, Fukui University, 教育学部, 教授 (90020073)
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| Project Period (FY) |
1984 – 1986
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| Keywords | radiolarian / Mesozoic / chert / shale / length-slow chalcedony / 美濃帯 / 日本列島 |
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| Research Abstract |
The northwestern Mino Terrane, central Japan, is underlain by Mesozoic sedimentary complex with Paleozoic greenstones and carbonate rocks. Many radiolarian fossils were extracted from siliceous shale and chert in this part of the terrane. The ages range between the Permian and Jurassic. Permian radiolarians are found only from the cherts as allochthonous blocks. Triassic radiolarians are common in ribbon cherts associated with Jurassic radiolarian-bearing sedimentary rocks. Excellent radiolarians are abundant in the middle Jurassic manganese concretions in varicolored siliceous shale.
Length-slow chalcedony was foun in the terrane. The mineralogic properties are examined in detail by means of the petrographic microscope, X-ray diffractometer, electron probe microanalyzer, and scanning electron microscope. The mode of occurrence of the length-slow chalcedony indicates that the Mino terrane was situated under an arid climate in the pre-Jurassic.
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