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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 |
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李环宇1, 丁锐1,2, 张世民1, 赵国存1, 和国文3
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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
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| 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 |
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| Complex Flower Structures in Concealed Section of the Lijiang-Xiaojinhe Fault Revealed by Shallow Seismic Exploration and Composite Drilling Exploration |
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Li Huanyu1, Ding Rui1,2, Zhang Shimin1, Zhao Guocun1, He Guowen3
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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
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| 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 |
