Whether a strike-slip fault zone of S-N trend developed in the centre South China Sea(SCS)has been focused by geologists who study tectonic evolution,but no any conclusion due to lack of data.The difficult issue has been resolved in this paper by studying the distribution of residual Mesozoic strata and interpreting new geological and geophysics data in the SCS.Zhongnan-Liyue(ZL)fault zone,a strike-slip fault zone with S-N trend,developed at both southern and northern continental margins and the initial time of its activity was at least in Mesozoic.Before sea-floor spreading of the SCS,this strike-slip fault zone attains about 700 km at southern and northern continental margins.In different geological times this fault zone was of different characteristics of tectonic movement,that was strike slip of left-rotation in Mesozoic,strike slip and extension in Early-Middle Paleogene,in order to strike slip in Late Paleogene and Early Neogene,last one strike slip accompanying pressure function in Middle-Late Neogene.
关键词
中南—礼乐断裂带/残余中生界/S-N向走滑断裂/构造活动/南海陆缘的东部/海洋地质学
Key words
Zhongnan-Liyue fault zone/residual Mesozoic strata/strike-slip fault with S-N trend/tectonic movement/east of continental margin of the SCS/marine geology
万方数据