Carbon-isotope stratigraphy and its chronostratigraphic significance for the Cretaceous Yezo Group, Kotanbetsu area, Hokkaido, Japan
スポンサーリンク
概要
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A positive carbon isotopic excursion across the Cenomanian/Turonian boundary in the Kotanbetsu area, Hokkaido, Japan provides accurate positioning of the boundary. A microscopic study based on organic petrology reveals that the organic matter included in mudstones of the Kotanbetsu River section is exclusively terrestrial. The results of stratigraphic time-series analysis of stable carbon isotopes from these mudstone samples can be translated as representing an average of a terrestrial plant community signal. The isotopic fluctuation through this time interval records information on the global ocean-atmosphere system. Two internationally recognized events characterize the uppermost Cenomanian through middle Turonian. On the basis of this study the Cenomanian/Turonian boundary can be recognized within a stratigraphic range of ~ 14 meters. This horizon of the boundary is concordant with that from biostratigraphy (ammonoids, inoceramids and planktonic foraminifers). Above the middle Turonian strata, the isotopic pattern supports the biochronology of planktonic foraminifers rather than that of inoceramids.
- 日本古生物学会の論文
- 2000-06-30
著者
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HASEGAWA Takashi
Division of Respiratory Medicine, Niigata University Graduate School of Medical and Dental Sciences
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Hasegawa Takeshi
Division Of Nephrology The Department Of Medicine Showa University Fujigaoka Hospital
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Hasegawa Takashi
Division Of Environmental Science And Technology Graduate School Of Kyoto University
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Hasegawa Takashi
Division Of Global Environmental Sciences And Engineering Graduate School Of Natural Science And Eng
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Hasegawa Takeshi
Division of Global Environmental Sciences and Engineering, Graduate School of Natural Science and Engineering, Kanazawa University
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