兰州黄河阶地高精度GPS测量与构造变形研究

Study on Tectonic Deformation of the Yellow River Terraces in Lanzhou Based on the High-resolution GPS Surveying

摘要:

在综合分析兰州黄河阶地发育和分布特征的基础上,采用高精度差分GPS测量并结合1:1万DEM图形数据资料,获得了黄河兰州段南北两岸阶地平面分布图和纵横剖面对比图。结合本区黄河不同级别阶地年代测试结果,研究了其构造变形特征,获得了穿越断裂带地区的阶地变形特点、变形带宽度、变形幅度和速率等定量参数。结果表明:兰州盆地晚第四纪的构造变形主要以褶皱隆升为主,盆地内的断裂晚第四纪无明显构造活动。

Abstract:

Based on analyzing the development and distribution of Yellow River terraces in Lanzhou city, using the high-resolution differential GPS measuring and DEM （1：10 000） mapping data, the terrace map and profiles along and cross the river are gotten. Complaining with the dating results of the different grade terraces, the tectonic deformation characters of the terraces are studied, and the quantitative parameters of terrace deformation characters, the widths of deformation zones, the extents and velocities of deformation in active fault zone are obtained. In conclusion, it is indicated that folding effect plays major role in tectonic deformation of Lanzhou Basin in late-Quaternary, while tectonic activity of faults has been not clear since that time.