西藏门巴地区嘉黎断裂带变形特征及演化  

Deformation characteristics and evolution of Jiali fault belt in Menba area,Tibet

作　　者：胡波 李泊洋 张明 张兰玲 

机构地区：[1]重庆地质矿产研究院,重庆400012 [2]内蒙古第十矿产勘查开发院,内蒙古赤峰024005 [3]内蒙古地质调查研究院,呼和浩特010050 [4]黑龙江工程技术学院,哈尔滨150300

出　　处：《世界地质》2011年第4期585-592,共8页World Geology

基　　金：国土资源部地质调查项目(200213000013)

摘　　要：地质剖面测量和区域构造解析方法研究表明,嘉黎断裂是一条多期活动并在不同时期显示不同性质的、有着长期发展历史的深大断裂。在晚三叠世—侏罗纪时期,班公湖—怒江洋盆南侧比如弧后盆地发生裂解,此时的嘉黎断裂应是北倾的正断层,控制着弧后盆地的沉积。晚侏罗世—早白垩世时期,伴随着盆地的消亡,出现一系列由南向北的逆冲断裂和蛇绿岩的就位。中新世至第四纪,嘉黎断裂带表现为伸展构造体系,局部出现右旋走滑,形成机理是青藏高原隆升导致构造块体不均匀运动和塌陷所致。The study on geological profiles survey and structural analysis show that Jiali fault is a long histori- cally deep and large fault with various characteristics at different times. In Late Triassic-Jurassic, the fault belt was the northward dipping normal fault where the Biru back-arc basin on the south of Bangonghu-Nujiang ocean basin cracked, and controlled the sedimentation of the back-arc basin. Accompanied by the disappearance of the basin, a series of thrust faults developed from south to north and the ophiolites intruded during Late Jurassic-Early Creta- ceous. Form Miocene to Quaternary, the Jiali fault redefined as an extensional tectonic system with local dextral strike-slips, and the formation mechanism is the uneven movement and subsidence of tectonic block caused by the uplift of Qinghai-Tibet Plateau.

关 键 词：嘉黎断裂带 变形特征 演化 西藏门巴 

分 类 号：P542.2[天文地球—构造地质学]