| 辽西北票孔子鸟Confuciusornis的层位及年代 |
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| 引用本文： | 李佩贤,庞其清,等.辽西北票孔子鸟Confuciusornis的层位及年代[J].地质学报,2001,75(1):1-13,T001. |
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| 作者姓名： | 李佩贤 庞其清 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 石家庄经济学院,河北石家庄,050031 |
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| 基金项目： | 地质矿产部区域地质调查局“九五”课题(地科96-19)的成果。 |
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| 摘 要： | 北票－义县上侏罗统张家口组和大北沟组，火山岩^40Ar-^39Ar年龄143．9Ma；重新厘定的义县组下部率武岩段，年龄137－129Ma，上部安山岩段，年龄126－120Ma；并确证四合屯一带孔子鸟Confuciusornis化石层就是金刚山组，年龄为123－120Ma。综合燕辽地区生物化石、同位素年龄和层位，Confuciusornis应归属早白垩世。
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| 关 键 词： | 上侏罗统－下白垩统 同位素年代学 孔子鸟化石 氩同位素 灿岩 |
The Horizon and Age of the Confuciusornis in Beipiao, Western Liaoning |
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| LI Peixian,CHENG Zhengwu,PANG Qiqing Institute of Geology,Chinese Academy of Geological Sciences,Beijing,Shijiazhuang University of Economics,Shijiazhuang.The Horizon and Age of the Confuciusornis in Beipiao, Western Liaoning[J].Acta Geologica Sinica,2001,75(1):1-13,T001. |
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| Authors: | LI Peixian CHENG Zhengwu PANG Qiqing Institute of Geology Chinese Academy of Geological Sciences Beijing Shijiazhuang University of Economics Shijiazhuang |
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| Abstract: | Over the area between Beipiao City and Yixian County, Liaoning Province, there outcrop trachyte-tra-chyandesite volcanic rocks of the Upper Jurassic Zhangjiakou Formation and sedimentary bed of the Dabeigou Formation. The 40Ar-39Ar datings of the volcanic rocks of the Zhangjiakou Formation give an age of 143. 9 Ma. The most recently defined basalt member in the lower part of the Cretaceous Yixian Formation was dated at 137 -129 Ma, while the andesite member in the upper part at 126-120 Ma. It is ascertained that sedimentary rocks with Confuciusornis, i. e. the Jingangshan Formation around Sihetun, being considered as a part of the Yixian Formation, are of 123-120 Ma in age. Based on fossil records, isotope ages and the strata sequences of the Yanliao (Beijing-Hebei-Liaoning) area, it is considered that Confuciusornis and the beds containing such fossils should belong to the Early Cretaceous. |
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| Keywords: | western Liaoning Upper Jurassic Lower cretaceous isotope age |
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