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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
李环宇1, 丁锐1,2, 张世民1, 赵国存1, 和国文3
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
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。
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
DOI:
分类号:P315
基金项目: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
Complex Flower Structures in Concealed Section of the Lijiang-Xiaojinhe Fault Revealed by Shallow Seismic Exploration and Composite Drilling Exploration
Li Huanyu1, Ding Rui1,2, Zhang Shimin1, Zhao Guocun1, He Guowen3
1.Institute of Crystal Dynamics, China Earthquake Administration, Beijing 100085, China;2.Institute of Geology, China Earthquake Administration, Beijing 100029, China;3.Lijiang Earthquake Agency, Lijiang, Yunnan 674100, China
Abstract:
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.
Key words:  Lijiang-Xiaojinhe fault  Buried active fault  Shallow seismic exploration  Composite drilling section  Flower structure