| 北京西山白垩纪-古近纪多期次构造叠加作用:以周口店黄院奥陶系变形为例 |
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| 引用本文： | 刘先益,梁晓,干微,王根厚,徐德兵,魏玉帅,张宏远,李加斌,黄祖根.北京西山白垩纪-古近纪多期次构造叠加作用:以周口店黄院奥陶系变形为例[J].地球科学,2021,46(4):1467-1480. |
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| 作者姓名： | 刘先益 梁晓 干微 王根厚 徐德兵 魏玉帅 张宏远 李加斌 黄祖根 |
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| 作者单位： | 中国地质大学地球科学与资源学院,北京100083;伦敦大学学院地球科学系,伦敦 WC1E 6BT;中国地质大学地球科学与资源学院,北京100083 |
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| 基金项目： | 教育部双一流学科建设项目;中央高校基本科研业务费专项资金资助 |
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| 摘 要： | 北京西山中新生代多期次变形强烈，是探讨华北板块构造演化的重要窗口.构造解析及EBSD组构分析表明，黄院奥陶系发育4个期次变形，第2期NE-SW向挤压变形为主体构造样式.第1期为顶面指向SEE的简单剪切，透入性面理S1已基本置换层理S0，伴生110°~120°缓倾拉伸线理；自北向南，第2期变形可划分为纵弯褶皱亚带和逆冲剪切亚带，褶皱倒伏趋势和剪切条带显示上盘向SW逆冲；第3期为沿面理S2发生的NNW向正断层式滑脱，第4期为近N-S向陡倾正断层系.依据卷入变形的闪长岩脉最年轻锆石U-Pb年龄峰值（~116 Ma），结合区域地质资料，认为:（1）黄院奥陶系第1期SEE向剪切时代为早白垩世晚期；（2）第2期晚白垩世NE-SW向挤压变形形成于燕山运动晚期，可能与蒙古-鄂霍茨克洋关闭之后的陆陆汇聚相关.
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| 关 键 词： | 北京西山 多期变形 构造 奥陶系 白垩纪 构造地质学 |
| 收稿时间： | 2020-06-19 |
Multiple-Stage Structural Superimposition of Cretaceous-Paloegene Deformation in West Hill of Beijing: An Example from the Ordovician Carbonate Rocks in Huangyuan,Zhoukoudian |
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| Liu Xianyi,Liang Xiao,Gan Wei,Wang Genhou,Xu Debing,Wei Yushuai,Zhang Hongyuan,Li Jiabin,Huang Zugen.Multiple-Stage Structural Superimposition of Cretaceous-Paloegene Deformation in West Hill of Beijing: An Example from the Ordovician Carbonate Rocks in Huangyuan,Zhoukoudian[J].Earth Science-Journal of China University of Geosciences,2021,46(4):1467-1480. |
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| Authors: | Liu Xianyi Liang Xiao Gan Wei Wang Genhou Xu Debing Wei Yushuai Zhang Hongyuan Li Jiabin Huang Zugen |
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| Abstract: | The West Hill of Beijing experienced multiple stages of deformation since Mesozoic,and is considered as an important window to decipher the tectonic evolution of the North China block. Structural analyses and the EBSD data show that the Ordovician carbonate rocks in Huangyuan of Zhoukoudian is characterized by four stages of deformation,among which the D2 NE-SW-striking compressional structures shaped the main structural style. The D1 is represented by top-to-the-SEE (110°-120°) shearing bands and the penetrative stretching lineation L1,and the pervasive foliation S1 has replaced the sedimentary bedding S0. From north to south,the D2 deformation can be subdivided into two subzones including buckle fold and ductile shear zone,showing a consistent kinematics of top-to-the-SE thrusting as indicated by the fold vergence and shearing bands,respectively. The D3 is featured by the NWW-directed normal slipping superimposed on the foliation S2,and the D4 displays nearly N-S-trending high-angle normal faults. According to the youngest zircon U-Pb age peak (~116 Ma) of a diorite intrusion,it infers that the D1 happened in the late Early Cretaceous,and the D2 occurred in the Late Cretaceous,i.e.,the Late Yanshanian stage,probably as a response to the continental-continental collision after the closure of the Mongol-Okhotsk Ocean. |
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