【摘要】 本文将羌塘盆地新生代构造运动划分为三个阶段:古近纪为剥蚀、夷平和地壳加厚阶段;中新世为强烈挤压、褶皱阶段;上新世—全新世为高原缓慢整体抬升阶段。羌塘盆地的环境变迁和地质灾害与新生代构造活动密切相关。本区的强烈隆起、半荒漠化、沙尘暴、山洪、泥石流、冰川崩塌和雪崩、地震等均受新构造活动控制。更多还原

【Abstract】 The Qiangtang Basin is the largest Mesozoic-Cenozoic basin in the northern part of the Qinghai-Xizang Plateau.The current hot spots of geological research for the basin focus on the Palaeo-Tethys evolution and petroleum geology,and little has been known for the Cenozoic geology of the basin.It is inferred,on the basis of Cenozoic stratigraphy,volcanic rocks and regional unconformities,that the Cenozoic tectonic activities in the basin have undergone three phases of evolution: erosion,planation and crustal thickening during the Palaeogene;highly compression and folding during the Miocene,and slow and overall uplifting of the plateau during the Pliocene to the Holocene.The neotectonic activities outlined above apparently have an important effect on the highly uplifted areas,semi-desert areas,sand storms,flash floods,debris flows,landslides,avalanches of snow and glaciers,and earthquakes in the Qiangtang Basin.更多还原