广东连州地区推覆构造的确定及其意义

Determination and significance of nappe structure in Lianzhou area of Guangdong

本文结合连州地区开展的四幅1∶5万区调工作的成果,对野外现象、构造形迹特征、形成的动力机制进行讨论分析。认为连州地区的逆冲推覆断裂位于宝安一带呈NWW向展布。其主要受控于印支期NWW向构造动力机制,外来系统由NNE向SSW推覆,形成早期低角度逆冲推覆断裂及牵引褶皱,并受晚期燕山期NNE向构造动力机制改造,由SEE向NWW侧挤压,推覆断坪面纵向叠加变形,地表先后出现NWW及NNE向的剥蚀,从而形成构造窗、飞来峰等构造现象。

In this paper, combining with the four regional geological work with a rate of 1 ： 50000 carried out in Lianzhou area, discusses the geological phenomenon, structural features, and the formed dynamic mechanism. And this paper concludes that the thrust fault area of Lianzhou is located in Baoan area as NW-W direction. It is mainly con- trolled by the tectonic movement mechanism of NWW in Indosinian , the external system formed from NNE to the SSW in a nappe method which results in the low angle thrust faults and folds in early days, and by the late Yanshan pe- riod, the NNE transformed to tectonic movement mechanism, extrusion from SEE to the NWW side, and the nappe fault flat surface endures vertical superimposed deformation, surface has appeared the erosion trend of NWW and NNE . Thus, the tectonic Window, klippe and other structures are formed.