张双楼矿区构造特征及其演化

为了解张双楼矿区构造发育情况,根据钻孔资料及井下揭露的构造特征,分析该矿区构造及演化特征。结果表明：张双楼矿区为一倾向NNW、走向略有变化的单斜构造,地层倾角一般在18°～25°;褶皱主要为冯家向斜和后周田背斜;断层以张性断层为主,压性断层较少;浆岩活动发生在燕山晚期,以基性岩为主。矿区先后经历了NW—SE向挤压、SN向拉张、EW向拉张三期应力场的演化,构造特征为多期次构造运动的叠加。该研究可为煤矿深度开采提供依据。

Structural feature and evolution of Zhangshuanglou mining area

This paper presents an effort to investigate the tectonic development of Zhangshuanglou mining area by analyzing the structural features of the mining area,drawing on drilling data and the structural features found underground.The results show that the mining area occurring as a monoclinal structure, with NNW tendency,slightly changing trend,and formation dips varying from 18°to 25°,consists of the folds dominated by Fengjia syncline and Houzhoutian anticline,the faults found to be more tensile than compressive,and magmatism occurring in the Late Yanshan,predominantly in mafic rocks.It follows that the mine structures,subjected to three stress field evolutions of the NW—SE compression stress,SN tensional stress,and EW tensional stress respectively,has as structural feature the superposition of multi-period tectonic movement.This study provides the basis for the deep mining operation.