渭河盆地的地质构造与构造地貌类型

渭河盆地位于祁吕系、秦岭纬向构造体系,华夏系、陇西旋卷构造四大构造体系交汇地带,这种地质构造背景是形成盆地构造地貌的基础。按照构造-成因分类原则,对本区构造地貌划分为两级8个类型,又按新构造运动特点划分出相应的亚类。这些地貌类型分布具有东西延伸成带,南北对应,垂向成层具阶梯状的空间配置特点。渭河盆地在四大构造体系制约下,共地堑构造是决定地貌空间配置的主要原因。

THE RELATIONSHIP BETWEEN THE TECTONIC LANDFORMS AND STRUCTURES IN THE WEIHE RIVER BASIN

The Weihe River Basin stands where the four tectonic systems of Qilu,Qin-ling, latitudinal direction, cathaysian and Longxi roll-up intersect, such tectonic characteristics lay a basis for the formation of tectonic landforms of the basin.According to the tectonic structures and formation causes, the tectonic land-forms in the Weihe River Basin can be classified into eight types and each type can be divided further into correspondent based on neotectonic movement characteristics.These geomorphic sequences, which stretch into belts in east-west direction, have lomologous features in north-south direction and possess terracing spatial variations,Under the control of major tectonic systems in the Weihe River Basin, the graben structure with its own features serves as main cause for estabishment of the landform spatial arrangement.The development of tectonic landforms in the Weihe River Basin underwent three stages, namely, preparation stage of Mesozoicera, Tertiary establishment stage and Quaternary completion stage.