延怀盆地隐伏断裂第四纪活动性研究  

Quaternary Activity of Buried Fault in Yanfan Basin

作　　者：吴玉涛 杨为民[1] 谭成轩[1] 周俊杰 张树轩[1,2,3] 李晓乐 于鸿坤 WU Yu-tao;YANG Wei-min;TAN Cheng-xuan;ZHOU Jun-jie;ZHANG Shu-xuan;LI Xiao-le;YU Hong-kun(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Chinese Academy of Geological Sciences,China University of Geosciences,Beijing 100083,China;college of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国地质大学,北京100083 [3]中国地质科学院,北京100083 [4]中国矿业大学地球科学与测绘工程学院,北京100083

出　　处：《华北地震科学》2018年第4期1-9,共9页North China Earthquake Sciences

基　　金：中国地质调查局项目“京津冀协同发展区活动断裂与区域地壳稳定性调查”(DD20160267)

摘　　要：依据盆地第四系沉积特点,结合高密度、CSAMT(可控源音频大地电磁)、浅层地震及钻孔磁化率探测结果,剖析隐伏断裂在盆地的几何形态特征及活动性。结果表明:延矾盆地北缘断裂南段(隐伏端)沿窑湾村-桑园南堡村展布,由2条SE倾的阶梯状正断层组成,切割第四系上更新统泥河湾组地层,上断点埋深40m,断距约35m;断裂在早-中更新世有过活动,晚更新世断裂活动性较强,全新世以后断裂活动性具逐渐减弱趋势;施庄断裂北隐伏段经施庄向SE145°方向展布,切割第四系泥河湾组地层,上断点埋深70m,断裂早-中更新世有过活动,晚更新世断裂活动性较强。综合分析认为,延怀盆地隐伏断裂在晚更新世时期活动性强,而全新世以来,各断裂活动性减弱。In this paper, we analyze the activity of the buried fault in Yanfan basin on basis of the sedimentary characteristics of Quaternary, combining the results of the multi-electrode resistivity, CSAMT, shallow earthquake and Drilling magnetic susceptibility The results show that the south section of north margin fault of Yanfan basin（buried） extend along Yaowan-Sangyuannanbao village, it consists of two SE tendency step-shaped normal faults and cuts the Nihewan stratum of Quaternary upper Pleistocene. The depth of upper break point is 40 m, and breaking distance is 35 m. It is shown that the activity of the early-middle Pleistocene was active and became stronger in the late Pleistocene. After the Holocene the activity of faults gradually decreased. The buried north section of Shizhuang fault distribute in the SE145°direction, and also cut Nihewan stratum and the depth of upper break point is 70 m, its activity has been high in the early-middle Pleistocene, and become higher in the late Pleistocene. Comprehensive analysis indicate that the buried faults of Yanhuai basin are very active in the late Pleistocene, and then become weaker since the Holocene.

关 键 词：延怀盆地 第四纪 隐伏断裂 活动性 

分 类 号：P315.2[天文地球—地震学]