北京昌平高崖口—南口隐伏岩溶水系统地质构造新认识  

Some new ideas on tectonics of karst aquifer system of Gaoyakou-Nankou in Changping, Beijing

作　　者：雷晓东[1,2] 关伟[2] 郭彤[2] 杨全合 胡圣标[1] 郭高轩[3] 

机构地区：[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

出　　处：《地质科学》2016年第1期116-127,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：北京岩溶水资源勘查评价工程项目（编号：BJYRS-KC-03-02）和昌平新城地热资源调查评价项目资助. 致谢 本文得到北京市地质勘察技术院薛洪林高级工程师的支持;田金教授级高工、陈坚工程师给予了十分有益的指导;审稿专家的意见,使本文进一步完善,在此一并表示感谢!

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30km、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1017．5m，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2．4km；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700m，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。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 Audiofrequency 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 1 017.5 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.

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 

分 类 号：P541[天文地球—构造地质学] P542[天文地球—地质学]