| Zircon U-Pb Ages of Bottom and Top Parts of the Zhangjiakou Formation in Lingyuan Area （West Liaoning Province） and Luanping Area （North Hebei Province） and Their Significance |
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| 作者姓名： | ZhangHong LiuXiaoming ZhangYeqing YuanHonglin HuZhaochu DiwuChunrong |
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| 作者单位： | Zhang Hong Key Laboratory of Continental Dynamics，Department of Geology，Northwest University，Xi'an 710069，China; Shenyang Institute of Geology and Mineral Resources，Shenyang 110032，China Liu Xiaoming Key Laboratory of Continental Dynamics，Department of Geology，Northwest University，Xi'an 710069，China Zhang Yeqing Hebei Institute of Regional Geology and Mineral Resources Research，Langfang 065000，China Yuan Honglin Hu Zhaochu Diwu Chunrong Key Laboratory of Continental Dynamics，Department of Geology，Northwest University，Xi'an 710069，China |
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| 基金项目： | ThispaperisfinanciallysupportedbytheChineseMinistryofScienceanTechnology(No.35,2000)，andtheChineseMinistryofLandandResources(Nos.200413000024and2000010403) |
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| 摘 要： | Thecharacteristicsofthetectonics,stratigraphy, paleontologyandvolcanicpetrologyoftheMesozoicin NorthHebeiandWestLiaoningaresimilarinmanyas pects,butthetworegionsalsohavesomeobvious differences.Thetworegionshavebeen“hotspots”inthegeologicalworldforafewy…
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| 关 键 词： | 锆石铀-铅年代测定 张家口 地质结构 辽宁西部 中生代 |
Zircon U-Pb Ages of Bottom and Top Parts of the Zhangjiakou Formation in Lingyuan Area (West Liaoning Province) and Luanping Area (North Hebei Province) and Their Significance |
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| ZhangHong LiuXiaoming ZhangYeqing YuanHonglin HuZhaochu DiwuChunrong.Zircon U-Pb Ages of Bottom and Top Parts of the Zhangjiakou Formation in Lingyuan Area (West Liaoning Province) and Luanping Area (North Hebei Province) and Their Significance[J].Journal of China University of Geosciences,2005,16(2):115-129. |
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| Authors: | Zhang Hong Liu Xiaoming Zhang Yeqing YUAN HongLin HU Zhaochu Diwu Chunrong |
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| Abstract: | In Lingyuan region of West Liaoning Province, the Zhangjiakou Formation (J3z) and the Yixian Formation (K1y) display an angular unconformity. That is, the Lower Mesozoic strata of the Zhangjiakou Formation are ENE (near E-W) oriented, while the overlying strata of the Yixian Formation exhibit an NNE orientation. The results of LA-ICP-MS zircon U-Pb ages show the Zhangjiakou Formation formed from about 130 Ma to 132 Ma in Lingyuan and 135 Ma to 136 Ma in Luanping (North Hebei Province), respectively. Three conclusions can be drawn: (1) The Zhangjiakou Formation in Lingyuan is comparable to that in Luanping, with the volcanic rocks of the Zhangjiakou Formation from Lingyuan being younger than those from Luanping. (2) 5-6 Ma difference between the top of the Zhangjiakou Formation and the bottom of the Yixian Formation in Lingyuan proves the angular unconformity between the two formations; and it reflects that the 5-6 Ma interval period is the main period of the transition of tectonic framework in Mesozoic in North Hebei and West Liaoning. In the interval period, the magmatic action went up to high tide in Mesozoic in the northeast of China. Moreover, after the interval period, the "Rehe fauna" developed into "erupted" period. This reflects that the interval period is also an important biological interface in Northern Hebei and Western Liaoning. (3) The Dabeigou Formation in Luanping should correspond to the upper part of the Zhangjiakou Formation, but not to the lower part of the Yixian Formation. |
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| Keywords: | zircon U-Pb age Zhangjiakou Formation bottom and top bed Luanping and Lingyuan regions |
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