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    刘函, 孙先锋, 郭镜, 张士贞, 苟正彬, 李俊, 王保弟. 西藏吉隆沟南北向构造及其对穿越喜马拉雅山脉工程建设的地质安全制约[J]. 中国地质. DOI: 10.12029/gc20220825004
    引用本文: 刘函, 孙先锋, 郭镜, 张士贞, 苟正彬, 李俊, 王保弟. 西藏吉隆沟南北向构造及其对穿越喜马拉雅山脉工程建设的地质安全制约[J]. 中国地质. DOI: 10.12029/gc20220825004
    LIU Han, SUN Xianfeng, GUO Jing, ZHANG Shizhen, GOU Zhengbin, LI Jun, Wang Baodi. The north-south structure zone of Jilong valley in Xizang (Tibet) and its restriction on the geological safety of the engineering construction across the Himalaya Mountains[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20220825004
    Citation: LIU Han, SUN Xianfeng, GUO Jing, ZHANG Shizhen, GOU Zhengbin, LI Jun, Wang Baodi. The north-south structure zone of Jilong valley in Xizang (Tibet) and its restriction on the geological safety of the engineering construction across the Himalaya Mountains[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20220825004

    西藏吉隆沟南北向构造及其对穿越喜马拉雅山脉工程建设的地质安全制约

    The north-south structure zone of Jilong valley in Xizang (Tibet) and its restriction on the geological safety of the engineering construction across the Himalaya Mountains

    • 摘要:研究目的】吉隆沟将是今后一段时间西藏穿越喜马拉雅山脉重大工程建设的重要区段,但是对该区基础地质特征认识仍不够系统,特别是对南北向构造的认识不足可能造成意想不到的工程建设风险。【研究方法】本文通过野外地质调查、节理统计、音频大地电磁测深、地热调查及U系测年方法系统刻画吉隆沟南北向断层与节理构造特征,分析与南北走向构造相关的主要工程地质风险。【研究结果】吉隆沟南北向断层普遍规模较小,少数切穿高喜马拉雅带,同时还是吉隆盆地的控盆断层。吉隆盆地的形成及沉积演化受控于其东界与内部4条南北走向正断层,盆地东界断层附近震积岩及内部大量同沉积断层指示盆地具间歇性活动特征。南北向节理呈区域透入性分布,应力分析显示受控于南北向裂谷相似的应力场。【结论】吉隆沟南北向构造潜在的工程地质风险源包括全新世活动性、对区域地热和崩塌、滑坡、泥石流等地质灾害的控制作用。提出南北向构造是吉隆沟重大工程规划建设地质安全风险评价的重点关注方向之一。

       

      Abstract: This paper is the result of basic geological survey engineering.Objective Jilong Valley will be an important area for major engineering projects across the Himalayas in Tibet in the future for a long time. However, we still lack a systematic understanding of the basic geological characteristics, especially the N-S-trending structure, which may induce unexpected engineering construction risks. Methods Field geological survey, joint statistics, geothermal investigation, audio frequency magnetotelluric sounding and calcite U-series dating were conducted to reveal the characteristics of the N-S-trending faults and joints in Jilong Valley, and through this to explore the main engineering geological risks related to the N-S-trending structures. Results The N-S-trending faults in Jilong Valley are generally small in scale, partially cutting through the high Himalayan belt, and also the basin controlling faults of Jilong Basin. The formation and sedimentary evolution of Jilong Basin were controlled by the four N-S-trending normal faluts in its east boundary and interior. The seismic rocks near the east boundary faults and syn-sedimentary faults in the basin indicate that the Jilong basin has intermittent activity characteristics. The regional permeable distribution is displayed by the N-S-trending joints, which were formed in a simialr stress field controlled by the N-S-trending rift. Conclusions The N-S-trending structure in Jilong Valley are potential engineering geological risk sources, according to its Holocene activity and its control over regional geothermal, and collapse, landslide, debris flow geological disasters. We propose that the North-South structure will be one of the important directions of geological safety risk assessment for the planning and construction of Jilong Valley major engineering project.

       

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