丽江—大理地区新构造运动特征及环境效应

丽江—大理地区新构造运动异常活跃,新构造保存较全。新构造运动造成了晚新生代及第四纪的地层普遍褶皱和断裂,表现出强烈性、差异性、振荡性、继承性和新生性等特征。同时,它又是十分重要的造貌运动,导致了高原面的形成与解体,奠定了该区现今地貌格局,对滇西北地区环境的影响十分显著:现今的主要水系定型;使处于鼎盛时期(N-Q1)的古湖泊加速收缩;生态环境退化;直接或间接地控制着本区地质环境的演化和地质灾害的发育,促使山地地质灾害进一步恶化,区域稳定性降低。

THE CHARACTERISTICS AND ENVIRONMENTAL EFFECSOF NEOTECTONIC MOVEMENT IN LIJIANG-DALI REGION

The neotectonic movements in Lijian g -Dali region are very active and the neotectonic structures are preserved perfectly.The folds a nd faults in strata of the late Cenozo ic and Quaternary are formed by the neotectonic movements and the movem ents have been the characteristics s uch as fierceness,differences,sur ge,inheritance,palingenesis and so on.At the same time,they are also physiognomy-created movements.Result from them,the formation and disorganization of the surface of the Plateau and the present pattern of phys-iognomy have come into being.The environmental effects in the northwest of Yunnan Province are promi-nent:present main water systems are formed.Ancient lakes in N -Q1 shrink acceleratedly.Ecological e n-vironment are worsening.The evolut ion of geological environment and th e development of geological hazards in this region are controlled directly or indirectly by the neotectonic movements.Because of the movements,geological hazards in mountain regions are more worsened and the regional stability is reduced.