| 古生代海洋碳同位素演化 |
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| 引用本文： | 陈锦石,刘培伦.古生代海洋碳同位素演化[J].地质科学,1995,30(4):338-347. |
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| 作者姓名： | 陈锦石 刘培伦 |
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| 作者单位： | 1. 中国科学院地质研究所 北京 100029;2. 核工业部北京地质研究院 北京 100029 |
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| 摘 要： | 本文给出对中国古生代海相碳酸盐岩地层的系统的碳同位素研究结果。对密集地采自寒武纪、奥陶纪、泥盆纪、石炭纪和二叠纪5个海相碳酸盐岩地层剖面的681个样品作了碳同位素研究。所得到的古生代海相碳酸盐岩地层δ13C值长趋势演化的模式表明,从寒武纪(δ13C平均为-0.3‰)到石炭纪(3‰)和二叠纪(3.4‰)逐渐富集13C.此变化模式与古生代有机碳的埋藏数量有关,或许与大洋中脊体系的体积变化有关。
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| 关 键 词： | 古生代 海洋 碳同位素 |
| 收稿时间： | 1994-09-20 |
| 修稿时间： | 1994-09-20; |
CARBON ISOTOPE VARIATION OF PALEOZOIC MARINE CARBONATE SEQUENCES |
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| Chen Jinshi, Wen Chuanfen, Zhong Hua.CARBON ISOTOPE VARIATION OF PALEOZOIC MARINE CARBONATE SEQUENCES[J].Chinese Journal of Geology,1995,30(4):338-347. |
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| Authors: | Chen Jinshi Wen Chuanfen Zhong Hua |
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| Institution: | 1. Institute of Geology, Chinese Academy of Sciences, Beijing 100029;2. Institute of Geology of Nuclear Industry. Beijing, 100029 |
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| Abstract: | This paper presents the results of study of carbon isotope variation of Paleozoic (including the Cambrian. Ordovician, Devonian, Carboniferous and Permian) marine carbonate stratigraphic sequences. These sections studied were selected at Dabeiwang and Xuzhou, Jiangsu province; Huanghuachang and Yichang, Hubei province; Duan and Debao, Guangxi province; Nashui and Luodian, Guizhou province and Xiangbo and Longling, Guangxi province, respectively. These sections are characterized by successive sequence, completely or mainly consisting of marine carbonate rocks, definition of geologic time and no influence of tectonic, magmatic and metamorphic processes. The sampling distance of these section is 1-3m and 681 samples have been analysed. These samples were treated by commonly used phosphoric acid method. Pure CO2 gas can be collected and analysed for carbon isotope by MAT 251 mass spectrometer. TTB-I (Ordovician limestone collected at Zhoukoudian, Beijing)serves as a working standard. Its δ13C-value is 0.58‰ to PDB. Precision of the individual measurements was better than ±0.1‰ and overall uncertainties were ±0.1‰.681 δ13C values obtained from these sections construct a more accurate and perfect curve indicating the δ13C value variation of Paleozoic marine carbonate sequences except the Silurian strata for which the available section for carbon isotope stratigraphy has not been found so far. The curve shows that the trend of δ13C value variation in Paleozoic is enrichment of 13C in marine carbonate rocks from the Cambrian, Ordovician and Devonian to the Carboniferous and Permian. The trend is confirmed by a few results obtained by other investigators and may be considered as a world-wide phenmenon The trend was caused by the variation of the amount of burial organic carbon which can be related to the sea-level change and perhaps related to the change of the volume of the mid-oceanic ridge system. |
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| Keywords: | Paleozoic Ocean Carbon Isotope |
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