民和盆地的构造特征

THE STRUCTURAL CHARACTERISTICS OFTHE MINHE BASIN

张虎权 杨中轩

Zhang Huquan Yang Zhongxuan

中国石油天然气总公司西北地质研究所, 兰州730020

Northwest Institute of Geology, CNPC, Lanzhou 730020

根据地震、重磁力与露头资料的分析,认为民和盆地具有双层结构,前期(上白垩统沉积前)为断陷,后期(下白垩统沉积后)为拗陷,是中新生代发展起来的断、拗山间沉积盆地;盆地基底为复合基底,即前寒武系变质岩和加里东褶皱带的花岗岩;将局部构造归纳为6种类型的构造样式,分属于扭动、冲断与基岩生长3大构造组合。

Based on analysis of seismic, gravitative and magnetic, and outcrop data, the dualstructures of the Minhe basin were recognized. The basin underwent an early graben stage(before deposition of the Upper Cretaceous) and a later depression stage (after depositionof the Lower Cretaceous). It was an inter-mount fault depression developed during theMeso-Cenozoic. Basement of the basin is a compound one,consisting of the Pre-Cambrianmetamorphic rocks and the granites of the Caledonian fold belts. Six different kinds of localstructural patterns were included in three main structural compositions of shear,overthrustand basement growing.

https://doi.org/10.11781/sysydz199603283