现代地质2026，Vol.40Issue(4)：1210-1219,10.DOI:10.19657/j.geoscience.1000-8527.202512030177
雅鲁藏布江缝合带大峡谷段震裂山体发育特征与失稳机理
Development Characteristics and Instability Mechanisms of Seismically Fractured Mountains in the Great Canyon Section of Yarlung Zangbo Suture Belt,Tibet,China
摘要
Abstract
Based on field geological investigations and existing research findings,this study systematically ana-lyzes the developmental characteristics of seismically fractured mountains within the Great Canyon Section of Yarlung Zangbo Suture Belt.Taking the Badenze mountain,located in Motuo,as a typical case,it summarizes the disaster-prone geological conditions from three aspects:lithological assemblage,tectonic activity,and rock mass structure.The mechanism of seismically fractured mountain instability under strong seismic activity was further investigated.The results indicate that the Great Canyon segment of the Yarlung Tsangpo Suture Belt is predominantly composed of the Aniqiao Formation,tectonic mélange,and Gangdese magmatic complex.Sig-nificant spatial heterogeneity and intense deformation among these lithologies,coupled with severe dissection by active faults such as the Motuo Fault,have resulted in extensively fractured rock masses with highly devel-oped structural planes.Consequently,historical mega-earthquakes,particularly the 1950 Ms 8.6 Chayu earth-quake,exacerbated structural relaxation and triggered widespread rock mass cavitation,thereby significantly compromising slope stability and rendering it highly susceptible to large-scale catastrophic failures under renewed strong seismic disturbances.Based on these findings,targeted strategies for disaster risk mitigation are proposed.Nevertheless,current research on the instability mechanisms of seismically fractured mountains in suture zones remains insufficient.Future studies urgently require the development of refined geomechanical models to elucidate the damage evolution mechanisms of heterogeneous mélange and clarify the dynamic response of cross-fault mountain masses under strong seismic shaking.This will provide critical support for the prevention and control of catastrophic geohazards across the Qinghai-Tibet Plateau.关键词
雅江缝合带/震裂山体/发育特征/孕灾地质条件/失稳机理Key words
Yarlung Zangbo Suture Belt/seismically fractured mountain/developmental characteristics/disaster-prone geological condition formation/instability mechanism分类
天文与地球科学引用本文复制引用
万佳威,李军,秦雅东,张翔,高浩源,张平平..雅鲁藏布江缝合带大峡谷段震裂山体发育特征与失稳机理[J].现代地质,2026,40(4):1210-1219,10.基金项目
国家自然科学基金(42407280,U2244226,U2244227) （42407280,U2244226,U2244227）
中国地质调查局项目(DD20230600602,DD202606201301). （DD20230600602,DD202606201301）
