北黄海盆地西部坳陷地质构造特征及演化

北黄海盆地位于华北地台东南部,北为辽东隆起,东为朝鲜北部地块,包括6个彼此分割的二级构造单元。北黄海西部坳陷位于盆地西部,构造较复杂,发育5条主要断层及一些次级断层,具有拉张、扭动、反转等3种构造样式,以拉张正断层为主。其形成演化与北黄海盆地的构造演化史密切相关,经历了从中生代到新生代的多期演化,包括中生代断陷、古近纪叠加断陷、新近纪拗陷等3个主要演化阶段。

STRUCTURAL FEATURES AND EVOLUTIONARY STAGES OF THE WESTERN DEPRESSION OF THE NORTH YELLOW SEA BASIN

The North Yellow Sea Basin is located in the southeastern part of the North China Platform.It is bounded by the Liaodong uplift to the north,and the northern Korean block to the east.The Basin is subdivided into six distinguished sub-grade tectonic units.The western depression,lying in the west part of the basin,is a sub-unit with complicated structural features.There are five main faults and some subordinate faults,including extensional,transpressional and reverse faults,dominated by the normal,as the results of the multiple stages of tectonic evolution of the North Yellow Sea Basin from Mesozoic to Cenozoic,which consists of the stages of Mesozoic rift-depression,Paleocene superimposed rifting and Neocene depression.