摘要
燕山辽西地区的盖层可分两个构造层,由燕辽复向斜和秦皇岛背形相互叠加,并相应发育两期推覆构造。复向斜范围包括内蒙地轴和燕山沉降带,是由长条形的三个背斜和二个向斜相间,及配套的EW向纵断裂、SN向横断裂和NE向、NW向的共轭断裂组成。著名的尚义-宽城-凌源-朝阳-北票断裂是复向斜及其次级背斜的轴部纵断裂,以南大岭组、窑坡组和北票组作为其裂隙充填物。燕山EW向断裂南北对冲现象是复向斜纵断裂放射状排列并向核部推覆的反映。复向斜的形成机制完全符合纵弯褶皱作用下岩石的变形原理,是西伯利亚板块和华北板块碰撞的结果;秦皇岛背形的形成是后期太平洋板块俯冲在欧亚板块之下所致。
The structure style of Yanshan and the western Liaoning consists of a synclinorium and an antiform. The synclinorium consists of E-W three longitudinal anticlines and two longitudinal synclines, the E-W longitudinal axis faults, S-N cross faults and NE, NW X-shaped faults. Shangyi-Kuancheng-Pepeifault is the longitudinal axis fault. The mid-low Jurassic series are its fissure fillings. Qinhuangdao antiform is as a result of NE-shearred western Liaoning along Qinhuangdao-Iinyan axis fault. The synclinorium has been reconstruted into the second Ramsay' s fold style. The NNE has overlaped the NE of X-shaped faults in Yanshan and the longitudinal faults in the western Liaoning. The geomdynamic mechanism of synclinoriuni is suitable to the buckle folding.
出处
《化工矿产地质》
CAS
2003年第1期5-12,共8页
Geology of Chemical Minerals
关键词
构造
燕辽复向斜
秦皇岛背形
横断裂
纵断裂
共扼断裂
裂隙充填物
synclinorium, Qinliuangdao antiform, the axial longitudinal faults, the fissure fillings, Linyan-Qinhuangdao fault, the longitudinal buckling.
