Cenomanian-Turonian carbon isotope events recorded in terrestrial organic matter from northern Japan
Cenomanian-Turonian carbon isotope events recorded in terrestrial organic matter from northern Japan
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DOI：
10.1016/s0031-0182(96)00129-0
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发表时间：
1997-05
期刊：
影响因子：
--
通讯作者：
T. Hasegawa
中科院分区：
文献类型：
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作者：
T. Hasegawa
来自日本北海道上白垩统Cenomanian-Turonian层序的陆地有机质中记录的碳同位素波动显示出与来自英格兰南部和意大利亚平宁山脉的碳酸盐碳同位素波动非常相似的模式。日本Cenomanian-Turonian剖面的年代学对比是基于浮游有孔虫生物地层学和一些来自宏体化石的额外数据，从而可以详细比较日本和欧洲的同位素地层学。在日本观察到三个明显的同位素剖面特征，即在Cenomanian/Turonian边界附近的正尖峰，在Turonian中下段的肩部和在Turonian中上段的水平段。这些特征在生物地层学上具有可比性，并与欧洲报告的同位素剖面相关。影响陆地有机碳和海洋碳酸盐碳同位素组成的单一因素是全球海气系统CO2库的同位素变化。如果这三个碳同位素特征是同步的，则可以推断它们是由全球现象引起的，并提供了全球高分辨率的化学地层标志。碳同位素地层学是沟通陆相层序和海相层序的重要桥梁。
Carbon isotopic fluctuations recorded in terrestrial organic matter from the Upper Cretaceous Cenomanian-Turonian succession of Hokkaido, Japan show a remarkably similar pattern to isotopic fluctuation in carbonate carbon reported from southern England and the Italian Apennines. Chronological correlation for the Cenomanian-Turonian section of Japan is based on planktonic foraminiferal biostratigraphy with some additional data from macrofossils, allowing a detailed comparison of isotope stratigraphies for Japan and Europe. Three distinct features of the isotope profile, namely a positive spike near the Cenomanian/Turonian boundary, a shoulder in the lower-middle Turonian and a level segment in the middle-upper Turonian are observed in Japan. These features are biostratigraphically comparable and correlative with isotope profiles reported from Europe. The single factor influencing isotopic composition of both terrestrial organic carbon and marine carbonate carbon is isotopic change in the global CO2reservoir of the ocean-atmosphere system. If these three carbon isotope features are synchronous, they may be inferred as having been caused by global phenomena and as providing global high-resolution chemo-stratigraphic markers. Carbon isotope stratigraphy could be an important bridge between terrestrial inland sequences and marine sequences.