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Field investigations and numerical modeling of a giant landslide in the region of Eastern Himalayan Syntaxis:Jiaobunong landslide 被引量:1
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作者 DU Guo-liang ZHANG Yong-shuang +2 位作者 YAO Xin YANG Zhi-hua YUAN Ying 《Journal of Mountain Science》 SCIE CSCD 2021年第12期3230-3246,共17页
Eastern Himalayan Syntaxis(EHS)is a tectonically active region that undergoes continuous geomorphic changes.Large landslides are predominant in this region.A giant landslide called Jiaobunong landslide on the northwes... Eastern Himalayan Syntaxis(EHS)is a tectonically active region that undergoes continuous geomorphic changes.Large landslides are predominant in this region.A giant landslide called Jiaobunong landslide on the northwestern flank of the EHS were studied and simulated to investigate the formation mechanism,evolutionary process,and failure mechanism of the landside,so that we could better understand the large complex ancient landslides in this region.Field investigation,geological background analyses,and numerical modeling were conducted to reveal the natural and seismic characteristics,as well as dynamic process of the landslide.The results show that the Jiaobunong landslide was the result of long-term geological and geomorphic evolution.Uplift,river incision,weathering,fault creep,glaciation,and earthquakes play key roles in the formation of landslides.Given the huge landslide volume,strong seismicity of the study area,proximity to an active fault,and the need for extra forces to induce landsliding,the Jiaobunong landslide was triggered by a paleo-earthquake.Using numerical simulation based on the discrete element method,the slope dynamic response of the earthquake as well as the mass movement and accumulation process was reproduced.Simulation results showed that the landslide movement experienced four stages:initiation phase(0-5 s),acceleration phase(5-35 s),deceleration phase(35-95 s),and the compaction and self-stabilization stage(after 95 s).The rock mass was disintegrated and experienced strong collisions during the movement.The dammed lake gradually disappeared because of long-term river incision by the overtopping river water.These processes play a vital role in the evolution of landforms in the region of EHS. 展开更多
关键词 eastern himalayan syntaxis Ancient landslide Formation mechanism evolution process tibetan plateau
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印度与欧亚板块碰撞以来东喜马拉雅构造结的演化 被引量:42
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作者 丁林 钟大赉 《地质科学》 CAS CSCD 北大核心 2013年第2期317-333,共17页
在野外填图,构造观察及前人研究的基础上,本文识别并描述了东喜马拉雅构造结中的推覆断裂、正断裂及走滑断裂、背斜(形)和向斜(形)等构造类型,讨论了这些构造位置及与印度板块挤入,印支地块旋转的关系,还探讨了东喜马拉雅构造结对印度... 在野外填图,构造观察及前人研究的基础上,本文识别并描述了东喜马拉雅构造结中的推覆断裂、正断裂及走滑断裂、背斜(形)和向斜(形)等构造类型,讨论了这些构造位置及与印度板块挤入,印支地块旋转的关系,还探讨了东喜马拉雅构造结对印度板块持续向北推挤下的特殊应变调节方式。在印度大陆部分,东喜马拉雅构造结由3个向外逐渐变新的构造结组成,即北东向的南迦巴瓦峰复式背斜、北西向的桑复式向斜及北东向的阿萨母复式向斜。上述3个构造结是协调印度板块的挤入、喜马拉雅弧的扩展及印支地块的旋转的构造。在欧亚大陆内部的冈底斯岛弧,在派区及阿尼桥走滑断裂协调下,高喜马拉雅结晶岩的基底挤入冈底斯岛弧内部,在大拐弯顶端形成向上的挤出构造。在南迦巴瓦峰构造结的北西侧,由于掀斜式抬升及重力滑动,使得冈底斯盖层与结晶基底脱耦,上盘盖层沿东久向北西方向滑动。在南迦巴瓦峰构造结北东侧,由于印支地块的挤出和旋转,形成一系列的北西向走滑断裂,如实皆断裂、嘉黎一高黎贡断裂、澜沧江断裂及红河断裂等。 展开更多
关键词 东喜马拉雅构造结 构造演化 青藏高原
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滇西兰坪—思茅盆地构造转换机制及成矿响应 被引量:5
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作者 李以科 王安建 《地球学报》 EI CAS CSCD 北大核心 2017年第B11期11-14,共4页
1研究背景 三江腹心昌都—兰坪—思茅盆地,吸收由印度板块挤入亚洲板块引起的变形,处于印亚大陆北东向碰撞挤压的前沿地带和深部物质逃逸地带。完好记录了超级大陆从裂解→增生→碰撞的演化史和大陆动力学过程,是中国大陆构造演化的缩... 1研究背景 三江腹心昌都—兰坪—思茅盆地,吸收由印度板块挤入亚洲板块引起的变形,处于印亚大陆北东向碰撞挤压的前沿地带和深部物质逃逸地带。完好记录了超级大陆从裂解→增生→碰撞的演化史和大陆动力学过程,是中国大陆构造演化的缩影,在全球构造演化中占举足轻重的地位。 展开更多
关键词 构造转换 大陆裂谷 成矿作用 兰坪—思茅盆地 青藏高原东缘 特提斯演化
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