龙门山南段三江-水磨-漩口飞来峰的构造变形及演化

Characteristics of Structural Deformation and Evolution of Sanjiang-Shuimo-Xuankou Klippe in Southern Segment of Longmen Mountain

为了解龙门山造山带构造演化过程,通过龙门山南段的三江-白石、水磨和漩口三条地质剖面,应用构造解析方法对野外实测的褶皱、节理和断层等构造变形要素进行综合分析,了解三江-水磨-漩口飞来峰的构造演化过程,最后确定出其主要区域构造应力场有五期:第一期NW-SE向、第二期S-N向、第三期E-W向、第四期NW-SE向、第五期竖直向。从印支晚期持续到喜山期。飞来峰的构造变形对研究龙门山的构造演化具有重要意义。

In order to find out the tectonic evolution of the orogenic belt of Longmen Mountain, the structural analysis method is used here for the comprehensive analysis of the folds, joint, fault and other tectonic deformation elements from field surveying so as to find out the tectonic evolution of the Sanjiang-Shuimo-Xuankou klippe of Longmen Mountain. Fi- nally, this region is determined to undergo the five-phase stress fields, such as the first phase of NW - SE, the second phase of S - N, the third phase of E - W, the fourth phase of NW - SE, and the fifth phase of vertical direction. The tectonic evolution of the klippe had continued from late Indosinian to Himalayan epoch. The studying on the klippe is of great significance for the tectonic evolution of Longmen Mountain.