| 北京昌平高崖口-南口隐伏岩溶水系统地质构造新认识 |
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| 引用本文： | 雷晓东,关伟,郭彤,杨全合,胡圣标,郭高轩.北京昌平高崖口-南口隐伏岩溶水系统地质构造新认识[J].地质科学,2016,0(1):116-127. |
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| 作者姓名： | 雷晓东 关伟 郭彤 杨全合 胡圣标 郭高轩 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室 北京 100029;
2. 北京市地质勘察技术院 北京 102218;
3. 北京市水文地质工程地质大队 北京 100195 |
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| 摘 要： | 高崖口-南口岩溶水系统是北京七大岩溶水系统之一,其东北部位于昌平南口,是隐伏岩溶地下水排泄区。查明该区地质构造发育情况,可以为评价岩溶水资源及北京优选战略后备水源地提供依据。本文在分析前人区域性重磁资料基础上,完成了5条总长30 km、总测点数626个的可控源音频大地电磁测深(CSAMT)剖面,采用SCS2D程序对CSAMT数据进行了二维反演解释,并实施了4眼勘探孔。物探和钻探研究结果表明:南口-孙河断裂是该系统的北东边界,走向北西,倾向南西,在雪山村附近断层落差达1017.5 m,是目前发现的断距最大的地区;断裂上盘蓟县系碳酸盐岩与侏罗系火山岩的地层界线,向西移动了2.4 km;南口山前断裂是山区裸露岩溶与平原隐伏岩溶的分界断裂,断裂走向北东,倾向南东,断距大于700 m,断裂上盘曹庄至南口一带有燕山期二长岩侵入,流村-葛村一带有燕山期闪长岩侵入。广泛发育的断层、岩体和火山岩,使这一区域岩溶含水层空间受到较大制约。
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| 关 键 词： | 南口-孙河断裂 南口山前断裂 岩体 可控源音频大地电磁测深 岩溶 |
| 收稿时间： | 2015-08-20 |
| 修稿时间： | 2015-08-20; |
Some new ideas on tectonics of karst aquifer system of Gaoyakou-Nankou in Changping,Beijing |
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| Lei Xiaodong,Guan Wei,Guo Tong,Yang Quanhe,Hu Shengbiao,Guo Gaoxuan.Some new ideas on tectonics of karst aquifer system of Gaoyakou-Nankou in Changping,Beijing[J].Chinese Journal of Geology,2016,0(1):116-127. |
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| Authors: | Lei Xiaodong Guan Wei Guo Tong Yang Quanhe Hu Shengbiao Guo Gaoxuan |
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| Institution: | 1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
2. Beijing Institute of Geo-exploration Technology, Beijing 102218;
3. Beijing Institute of Hydrogeology and Engineering Geology, Beijing 100195 |
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| Abstract: | The karst water distribution area of Gaoyakou-Nankou is one of the seven karst water systems in Beijing. Its northeastern part, which located in the Nankou Town of Changping district, is groundwater discharge area of buried karst. In order to assess karst water resources and select emergency water source, it is necessary to survey the tectonics of this area. We analyzed regional gravity and magnetic data and collected 626 Controlled Source Audio-frequency Magneto Tellurics(CSAMT)measurment points from 5 profiles(total 30 km long). The CSAMT data was processed by the 2D inversion module of SCS2D software and the depth of geological structures were obtained by the interpretation, then exploration holes were carried out on four sites located in Nankou Town. Joint interpretation of all geophysical and geological data suggests that, Nankou-Sunhe fault trending NW, dipping SW, is the NE boundary of karst water system of Gaoyakou-Nankou. It has been founded that the greatest displacement of this fault is 1017.5 m in Xueshan village site so far. Compared to previous results, the boundary of Jixianian System carbonatite and Jurassic volcanic rocks should be moved to 2.4 km west distance in the hanging wall of the fault. Nankou Hill fault, trending NE, dipping SE, is the boundary of bare karst and buried karst, with displacement more than 700 m. There are monzonite ranges from Caozhuang to Nankou and diorite ranges from Liucun to Gecun of Yanshan Period in the hanging wall of the fault. The range of the karst aquifer is limited due to widely distributed faults, rock mass and volcanic rock. |
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| Keywords: | Nankou-Sunhe fault Nankou Hill fault Rock mass CSAMT Karst |
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