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地质科学  1995, Vol. Issue (2): 166-173    DOI:
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蓟县剖面杨庄组和雾迷山组形成年龄的研究
王松山, 桑海清, 裘冀, 陈孟莪, 李明荣
中国科学院地质研究所, 北京100029
THE FORMING AGES OF YANGZHUANG AND WUMISHAN FORMATIONS IN JIXIAN SECTION,NORTHERN CHINA
Wang Songshan, Sang Haiqing, Qiu Ji, Chen Meng’e, Li Mingrung
Institute of Geology, Chinese Academy of Sciences, Beijing 100029
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摘要 对蓟县剖面杨庄组和雾迷山组白云岩中条带状燧石采用40Ar/39Ar阶段加热技术和Cl-Ar相关性,消除了样品中次生流体包体及过剩Ar的干扰,从而获得燧石40Ar/39Ar等时年龄。结果表明高于庄组-杨庄组、杨庄组-雾迷组和雾迷山-洪水庄组的界限年龄分别是1380、1310和1207Ma.
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王松山
桑海清
裘冀
陈孟莪
李明荣
关键词杨庄组   雾迷山组   形成年龄     
Abstract: The Middle-Upper Proterozoic section of Jixian, Northern China well known in the world owing to excellent outcrop, slight or unmetamorphism, simple deformation and aboundant fossils. The section is composed the Changcheng, Jixian and Qingbakou Systems from bottom to top, the total thickness is about 9200m. The uppper part of Changcheng System is Gaoyuzhuang Formation. And the Jixian System contains, in ascending order, the Yangzhuang, Wumishan, Hongshuizhuang and Tieling Formations. JX12 bedded chert in dolomite was collected from the top of the Gaoyuzhuang Formation i. e. the boundary between Gaoyuzhuang and Yangzhuang Formations. JX16 bedded chert in dolomite was collected from the upper part of Yangzhuang Formation, the distance between the sample locality and the top of this formation is 20m. JX26 bedded chert in dolomite was collected from the top of Wumishan Formitaon, i. e. the boundary between Wumishan and Hongshuizhuang Formations.For the 40Ar/39Ar measurements, irradiations were performed in 49-2 reactor in Beijing. Samples were shieled with 0.5mm of Cd during the irradiation, which had a duration of about 65 h. Ar isotopes derived from K, Ca and Cl has been corrected. BSP-1 hornblende, with a K-Ar age of(2060±8)Ma, was used as the flux monitor.All chens analysed contain excess(40Ar)e, although in variable amounts. And the(40Ar)e showed a strong correlation with the(38Ar)Cl relesed, and hence with chlorine. Based on the plot of(40Ar/39Ar)VS.(38Ar)Cl/39Ar, the intercept was obtained, and then the isochron age was calculated. The thin sections and electron microscope showed that all samples contain second fluid inclusions, hence the data from low temperature steps(≤800℃)were deleted when calculating isochron ages.The isochron ages of samples JX12 and JX16 are(1380 ±24)Ma and(1317±22)Ma respectively. The isochron ages of sample JX26 and its duplication determination result(JX26-1)are(1206±27)Ma and(1208±21)Ma respectively.Based on the four ages above, we assign(1380±24)Ma,(1310 ± 20)Ma and(1207 ± 10)Ma as the boundary ages between Gaoyuzhuang and Yangzhuang Forma tions, Yangzhuang and Wumishan Formations, as well as Wumishan and Hongshui.zhuang Formations, respectively.
Key wordsYangzhuang Formation   Wumishan Formation   Forming ages   
收稿日期: 1994-01-18;
基金资助:国家自然科学基金
引用本文:   
王松山,桑海清,裘冀等. 1995, 蓟县剖面杨庄组和雾迷山组形成年龄的研究. 地质科学, (2): 166-173.
Wang Songshan,Sang Haiqing,Qiu Ji et al. THE FORMING AGES OF YANGZHUANG AND WUMISHAN FORMATIONS IN JIXIAN SECTION,NORTHERN CHINA[J]. Chinese Journal of Geology, 1995, (2): 166-173.
 
没有本文参考文献
[1] 韩宝平. 任丘油田雾迷山组白云岩储集层的渗透性试验研究[J]. 地质科学, 2000, (4): 396-403.
 
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