摘要
通过碧痕营穹窿内220余条节理的观察、统计、分析,该区发育NWW-SEE与NNW-SSE至近SN向、NNE-SSW向与近SN向、NNE-SSW向与近EW向及NNW-SSE至近SN向与NNE向等四套共轭X节理。在此基础上对节理所反映的构造应力场进行反演,结果表明,研究区可能发生了NW-SE、NWW-SEE、NE-SW及NNE-SSW向四次应力作用,其中NW-SE向、NWW-SEE向为两期主要应力场,NNE-SSW向和NE-SW向可能为后期局部应力场。根据应力场演化分析,近EW向右行走滑断层形成时,它指示的主应力方向为NW-SE向,当近EW向和NE向右行走滑断层连接过程中,研究区从走滑背景转化为转换挤压背景,这过程中主应力发生逆时针方向旋转为NWW-SEE向,在此应力场背景下,形成了轴向为NNE向的碧痕营穹窿。
Over 220 are observed,investigated and analyzed in the study area. The results show that 4 sets of the X-type conjugate joints development with the NWW-SEE and NNW-SSE,SN- striking,NNE- SSW and SN-striking,NNE-SSW and EW-striking,NNW-SSE,SN and NNE-SSW-striking. On the basis of that,the tectonic stress field was reflected by the joints inversion. The results show that there are four times compressive stress in the study area,that is,the NW-SE,NWW-SEE,NE-SW,and NNE-SSW-striking. Among them,the NW-SE-striking and NWW-SEE-striking for two main stress field,the NNE-SSW-striking and NE-SWstriking to may be late for local stress field. According to the evolution of stress field analysis,when form to nearly EW-striking dextral strike-slip fault,it indicative the principal stress direction of the NW-SE-striking,and when it connected by the EW-striking and NE-striking of two groups of the dextral strike-slip faults,the study area from strike-slip setting transform into a transpressional setting. The principal stress occurred in this process of counterclockwise for the NWW- SEE strike,in which case the NNE direction of Bihenying dome formed by setting of the stress field.
出处
《贵州大学学报（自然科学版）》
2016年第3期44-49,共6页
Journal of Guizhou University:Natural Sciences
基金
国家自然科学基金项目资助(41072072)
关键词
X型共轭节理
构造应力场
构造解释
碧痕营穹窿
X-type conjugate joints
tectonic stress field
tectonic interpretation
Bihenying dome
