云南丽江地区断裂构造岩岩组动力学研究  

Study on Petrofabric Dynamics of Fracture Tectonic Rock in LiJiang Region,Yunan

作　　者：俞维贤[1] 安晓文[1] 胡耀雄[1] 孟雁[1] 

机构地区：[1]云南省地震局,云南昆明650041

出　　处：《地震研究》2002年第1期58-61,共4页Journal of Seismological Research

基　　金：云南省自然科学基金 ( 2 0 0 0D0 0 2 8Q课题 )

摘　　要：丽江地区构造岩岩组动力学研究表明 ,研究区内中更新世末构造主压应力保持在北西至北西西方向变化 ;晚更新世中期之后构造主压应力方向则以北北东至北东方向为主变化 ,并有逐渐向近南北向转化的特点。因此玉龙雪山东麓断裂在中更新世末曾有过左旋压扭活动为主的历史 ,兼有左旋、右旋的活动过程 ,1996年2月 3日丽江M7The study on petrofabric dynamics of tectonic rock in Lijiang region shows that the tectonic principal compression stress orientation in the region in the last phase of middle Pleistocene changed from NE to NWW;after middle phase of the late Pleistocene the tectonic principal compression stress orientation changed mainly from NNE to NE,with gradual transformation to near SN direction.The fault at the east foot of Yulong Mountain had the history taking left-lateral compression shear motion as dominate,with left and right lateral motion in the last phase of middle Pleistocene and the rupture course for the M7.0 Lijiang earthquake at Feb.3,1996 inherited the motion features of the fault in the later period of the late Pleistocene.

关 键 词：云南丽江 构造岩岩组 动力学 断裂活动 

分 类 号：P315.2[天文地球—地震学]