川滇块体北-东边界活动构造带运动学转换与变形分解作用  

KINEMATICAL TRANSFORMATION AND SLIP PARTITIONING OF NORTHERN TO EASTERN ACTIVE BOUNDARY BELT OF SICHUAN-YUNNAN BLOCK

作　　者：陈桂华 徐锡伟 闻学泽[2] 王亚丽[3] 

机构地区：[1]国地震局地质研究所,北京100029 [2]四川省地震局,成都610041 [3]中国地震台网中心,北京100045

出　　处：《地震地质》2008年第1期58-85,共28页Seismology and Geology

基　　金：中国地震局地质研究所基本科研业务专项(DFIGCEA060712);国家重点基础研究发展计划项目(2004CB418401)资助

摘　　要：青藏高原周缘活动构造带的定量运动学研究对于理解整个高原演化是一项基础性工作。利用数字摄影测量技术和区域气候-地貌-构造对比分析的年代学方法,获取了川滇块体北-东边界活动构造带内主要断裂的运动学定量数据,发现多个断裂段作为走滑活动为主的断裂在局部存在中心对称的倾向滑动分量。据矢量分析方法,将川滇块体北-东边界活动构造带及其相邻块体作为一个区域性构造系统,利用构造带内主要断裂的运动学定量数据,分析了构造带横向上的构造运动学转换关系和纵向上的变形分解作用,确定出贡嘎山隆起区存在6·2mm/a的具有透入分布式的垂直隆升速率、安宁河谷东侧台地内侧存在倾滑速率至少1·45mm/a、以逆冲为主的活动断裂。定量地建立了川滇块体北-东边界构造转折带和东边界构造带的变形分解模式,进而建立了川滇块体北-东边界活动构造带及其相邻块体组成的区域性构造系统的定量运动学模型。It is a fundamental study for the research of evolution of Qinghai-Tibetan Plateau to resolve the kinematics of active boundary belt around the plateau quantitatively. With the measuring technology of photogrammetry and chronological method of analysis among regional climate, geomorphology and tectonics,we get a set of quantitative kinematical data for the main faults along the northern-eastern active boundary belt of Sichuan-Yunnan block. There were centre-symmetrical dip-slips locally in many fault segments while they were mainly strike-slip. With vector computation within a regional system including the north-east active boundary belt of Sichuan-Yunnan block and related blocks,we analyzed the longitudinal kinematical transformation and transversal slip partitioning quantitatively based on the parameters of main faults kinematics. From these data, there were a vertical uplift rate of 6.2mm/a in the Gonggashan area in distributed deformation form, and a mainly dip-slip fault at least with a rate of 1.45mm/a along the inner side of eastern terrace of Anninghe valley. We set up quantitative slip partitioning models for the northeast comer and eastern belt of Sichuan-Yunnan block. A quantitative kinematical model is set up for the regional system which consists of the northern-eastern active boundary belt of Sichuan-Yunnan block and related blocks.

关 键 词：川滇块体 构造运动学 变形分解作用 构造转换 定量模型 

分 类 号：P315.2[天文地球—地震学]