论北京西山南部的盖层构造演化

ON THE TECTONIC EVOLUTION OF COVER ROCKS IN THE SOUTHERN PART OF WEST-HILL,BEIJING

本文对变形、变质、岩浆、沉积等地质事件的相互关系进行分析,论述了北京西山南部板内地块盖层的构造演化,建立了10个世代变形的构造序列,其中经历了至少5次伸展和收缩构造体制的转换。由伸展至收缩构成了一个构造旋回(或亚旋回)。作者提出了一个变质地质体在一次变质—变形旋回中构造演化的理想模式。

On the basis of the relationship between the events of deformation, meta-morphism,magmation and sedimentation,the tectonic evolution of cover rocks at the southern part of West-Hill, Beijing, has been described. It can be seen that in the deformation series, which may be divided into ten generations, the transformation of tectonic regimes from extension to compression can be recognized, which occurred at least five times in the studied area. According to this analysis, an ideal model of geological evolution in a metamorphic -deformation cycle is suggested.