1997 Fiscal Year Final Research Report Summary
MAGNETO-BIOSTRATIGRAPHY OF UPPER CRETACEOUS SYSTEM IN JAPAN
| Project/Area Number |
08640592
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | KOCHI UNIVERSITY |
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Principal Investigator |
KODAMA Kazuto Kochi Univ., Dept., of Geology, Professor, 理学部, 教授 (00153560)
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| Project Period (FY) |
1996 – 1997
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| Keywords | MAGNETOSTRATIGRAPHY / UPPER CRETACEOUS / HOKKAIDO / KYUSHU / YEZO GROUP / POLARITY CHRON / BIOSTRATIGRAPHY |
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| Research Abstract |
A line of magnetostratigraphic studies were done focusing on the upper Cretaceous Yezo Group in central Hokkaido. Four magnetozones of normal or reversed polarity were recognized from the upper part of the Osoushinai Formation distributed along the Abeshinai River and its tributaries in Teshio-Nakagawa area. In addition, a pair of normal and reversed polarity magnetozones were recognizable from the uppermost Haborogawa Formation in Haboro area. Comparison of these magnetozones with a geomagnetic polarity time scale led to a possible magnetic polarity interpretation that the four magnetozones could be correlated from top to bottom to the late Cretaceous magnetic polarity chrons C32r.1r, C32r.1n, C32r.2r, and C33n. In terms of macro-fossil stratigraphy, the Sphenoceramus schmidti zone is correlated to polarity chron C32r.1r, the Sphenoceramus orientalis zone to C32r.1n, and the upper part of the Polyptychoceras pseudogaultinum zone to C32r.2r.
Paleomagnetic studies were also conducted for the upper Cretaceous strata in Kyushu including the Goshoura Group, the Mifune Group, the Ohnogawa Group, and the upper Konmon Group. All these strata are of normal polarity correlatable to the Cretaceous long normal polarity chron, C34n.
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[Publications] Sakai, T., Aida, Y., Higuchi, Y., Hori, R., Kodama, K., Takemura, A., Campbell, H.J., Grant-Mackie, J.A.Hollis, C.J., Sporli, K.B.: "Mesozoic phosphatic and calcareous nodules containing well-preserved radiolarian fauna from the North Island, New Zealand." Journal of the Geological Society of Japan. 104. V-VI (1998)
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[Publications] Kodama, K., Maeda, H., Shigeta, Y., Kase, T., and Takeuchi, T.: "Magnetostratigraphy of Upper Cretaceous strata in South Sakhalin, Russian Far East." Cretaceous Research. (in press). (1998)
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「研究成果報告書概要(欧文)」より
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