| Discovery of Early Proterozoic Carbon Isotope Shifts |
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| 作者姓名： | Zhong Hua Institute of Geology Chinese Academy of Sciences Beijingand Ma Yongsheng Research Institute of Petroleum Exploration and Development Beijing |
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| 作者单位： | Zhong Hua Institute of Geology，Chinese Academy of Sciences，Beijingand Ma Yongsheng Research Institute of Petroleum Exploration and Development，Beijing |
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| 基金项目： | This study was supported by China National Natural Science Foundation Grant 49000035，the Zhongguancun Associated Centre of Analysis, Beijing |
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| 摘 要： | The authors have detailedly and systematically studied the carbon isotopic composition of Early Proterozoic carbonate rocks. Samples which are all dolomicrite were taken from the Jianancun, Daguandong and Huaiyincun Formations of the Hutuo Group in Wutai County Shanxi Province, North China. A total of 209 samples were analysed for their carbon isotope compositions, and the mean sampling interval was 6.9 m. Carbon isotope analysis clearly shows δ13C shifts at the boundary between the Jian'ancun Formation and Daguandong Formation and near the boundary between the Daguandong Formation and Huaiyincun Formation. Like carbon isotope shifts at the Cretaceous-Tertiary, Permian-Triassic and Precambrian-Cambrian boundaries, the discovery of δ13C shifts in the Early Proterozoic has important significance in further studies on Early Proterozoic biotic evolution, regional and global stratigraphic correlation, and carbon geochemical cycles.
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Discovery of Early Proterozoic Carbon Isotope Shifts |
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| Authors: | Zhong Hua Institute of Geology Chinese Academy of Sciences Beijingand Ma Yongsheng Research Institute of Petroleum Exploration and Development Beijing |
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| Abstract: | Abstract The authors have detailedly and systematically studied the carbon isotopic composition of Early Proterozoic carbonate rocks. Samples which are all dolomicrite were taken from the Jianancun, Daguandong and Huaiyincun Formations of the Hutuo Group in Wutai County Shanxi Province, North China. A total of 209 samples were analysed for their carbon isotope compositions, and the mean sampling interval was 6.9 m. Carbon isotope analysis clearly shows δ13C shifts at the boundary between the Jian'ancun Formation and Daguandong Formation and near the boundary between the Daguandong Formation and Huaiyincun Formation. Like carbon isotope shifts at the Cretaceous - Tertiary, Permian - Triassic and Precambrian - Cambrian boundaries, the discovery of δ13C shifts in the Early Proterozoic has important significance in further studies on Early Proterozoic biotic evolution, regional and global stratigraphic correlation, and carbon geochemical cycles. |
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| Keywords: | carbon isotope shift Early Proterozoic carbonate strata |
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