辽西北票孔子鸟Confuciusornis的层位及年代  

The Horizon and Age of the Confuciusornis in Beipiao, Western Liaoning

作　　者：李佩贤[1] 程政武[1] 庞其清[2] 

机构地区：[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

出　　处：《地质学报》2001年第1期1-13,T001,共14页Acta Geologica Sinica

基　　金：地质矿产部区域地质调查局"九五"课题(地科96-19)的成果。

摘　　要：北票—义县上侏罗统张家口组和大北沟组,火山岩^(40)Ar-^(39)Ar年龄143.9 Ma;重新厘定的义县组下部玄武岩段,年龄137～129 Ma,上部安山岩段,年龄126～120 Ma;并确证四合屯一带孔子鸟Confuciusornis化石层就是金刚山组,年龄为123～120 Ma。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。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.

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 

分 类 号：Q915[天文地球—古生物学与地层学]