浅层地震勘探与联合钻孔探测揭示丽江-小金河断裂隐伏段复杂花状构造特征  

Complex Flower Structures in Concealed Section of the Lijiang-Xiaojinhe Fault Revealed by Shallow Seismic Exploration and Composite Drilling Exploration

作　　者：李环宇 丁锐[1,2] 张世民[1] 赵国存[1] 和国文 Li Huanyu;Ding Rui;Zhang Shimin;Zhao Guocun;He Guowen(Institute of Crystal Dynamics,China Farthquake Administration,Bejjing 100085,China;Institute of Geology,China Earthquake Administration,Beijjing 100029,China;Lijiang Farthquake Agency,Lijiang,Yunnan 674100,China)

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]中国地震局地质研究所,北京100029 [3]丽江市地震局,云南丽江674100

出　　处：《中国地震》2020年第1期1-13,共13页Earthquake Research in China

基　　金：中国地震局地壳应力研究所基本科研业务专项(ZDJ2018-22、ZDJ2017-24);城市活断层探测与地震危险性评价项目(丽江-小金河断裂(丽江盆地隐伏段)地质填图项目)与中国地震局地质研究所地震动力学国家重点实验室项目(LED2016A01)共同资助。

摘　　要：丽江-小金河断裂是川滇菱形块体内部重要的边界断裂,前人根据其断错地貌特征确定其为左旋走滑断层,并认为其左旋断错了SN向的丽江盆地。本文对丽江-小金河断裂丽江盆地隐伏段开展了浅层地震勘探与钻孔探测,通过地层岩性分析建立跨断层的钻孔联合剖面,揭示丽江-小金河断裂斜穿了丽江盆地,隐伏段整体形式为不对称正花状构造,表现为断展褶皱和逆冲断层,但主断层顶部表现为局部拉张,断错了晚第四纪地层。The Lijiang-Xiaojinhe fault is an important tectonic boundary within the Chuan-dian diamond block. The previous studies suggested that the fault is left-lateral strike-slip supported by the faulted landform characteristics,and considered that the Lijiang Basin has been faulted. In this paper,shallow seismic exploration and borehole exploration are carried out in the basin-concealed section of the Lijiang-Xiaojinhe fault,and the stratigraphic composite section of the fault is established through the analysis of stratigraphic lithology. We found that the Lijiang-Xiaojinhe fault has crossed the Lijiang Basin. The overall form of the concealed section is an asymmetrical positive-flower structure,which is characterized by fault-propagation fold and thrust faults.However,the top of the main fault is characterized by local extension and the main fault had faulted late Quaternary strata.

关 键 词：丽江-小金河断裂 隐伏断层 浅层地震勘探 钻孔联合剖面 花状构造 

分 类 号：P315[天文地球—地震学]