| 蓟县早寒武-新元古不整合界面处风化壳碳酸盐碳、氧同位素组成特征 |
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| 引用本文： | 李任伟,陈锦石,陈志明.蓟县早寒武-新元古不整合界面处风化壳碳酸盐碳、氧同位素组成特征[J].地质科学,2000,35(1):55-59. |
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| 作者姓名： | 李任伟 陈锦石 陈志明 |
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| 作者单位： | 中国科学院地质与地球物理研究所, 北京100029 |
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| 摘 要： | 由于土壤中有机质降解产生的CO2 和淡水成岩作用的影响,在蓟县早寒武世和晚元古代景儿峪组不整合界面处古风化壳中碳酸盐的δ13C值和δ18O 值明显偏负,从风化壳向下往原岩的方向,δ13C和δ18O 数值逐渐增加;此外,与风化壳上、下碳酸盐岩地层的δ13C和δ18O 数值具有明显的差别。上述同位素组成特征可以用于其它古风化壳剖面及地层不整合界面的判识。
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| 关 键 词： | 碳和氧同位素 古风化壳 淡水成岩作用 |
| 收稿时间： | 1999-01-24 |
| 修稿时间： | 1999年1月24日 |
CHARACTERISTICS OF THE C-AND O-ISOTOPIC COMPOSITIONS OF CARBONATES IN THE WEATHERING PROFILE AT THE UNCONFORMABLE BOUNDARY BETWEEN THE EARLY CAMBRIAN AND LATE PROTEROZOIC IN JI COUNTY,NORTH CHINA |
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| Li Renwei,Chen Jinshi,Chen Zhiming.CHARACTERISTICS OF THE C-AND O-ISOTOPIC COMPOSITIONS OF CARBONATES IN THE WEATHERING PROFILE AT THE UNCONFORMABLE BOUNDARY BETWEEN THE EARLY CAMBRIAN AND LATE PROTEROZOIC IN JI COUNTY,NORTH CHINA[J].Chinese Journal of Geology,2000,35(1):55-59. |
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| Authors: | Li Renwei Chen Jinshi Chen Zhiming |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Due to the influence of the CO2 derived from the decay of organic matter in soil and the meteoric diagenesis, δ13C and δ18O values of the carbonates in the weathering profile at the unconformable boundary between the early Cambrian and the late Proterozoic Jingeryu Formation in Ji County, North China are markedly negative, and increase with the distance to the unaltered rocks downwards. In addition, the C-and O-isotopic composition of the carbonates in the strata above and below the weathering profile are different. The characteristics of the C-and O-isotiopic compositions described above can be applied to the recognition of other paleo-weathering crusts and the stratigraphic unconformable boundary associated with them. |
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| Keywords: | C- and O-isotopes Paleo-weathering crust Meteoric diagenesis |
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