渤海湾盆地中、新生代构造演化研究

The Tectonic Evolution of Bohai Basin in Mesozoic and Cenozoic Time

根据中生界上侏罗统和下白垩统地层和控盆断裂分布分析 ,中生代晚期晚侏罗—早白垩世郯庐断裂带的左旋走滑平移导致郯庐断裂带以西自北向南发育了 3个北西向断堑系 ,即北部的渤海断堑系、中部的济阳断堑系和南部的鲁西南断堑系。从区域资料综合分析 ,渤海湾盆地的基本格局是早第三纪以来的新生代盆地格局。渤海湾盆地的形态、构造和沉积特征及热流值分布表明该盆地在新生代为拉分盆地。根据渤海湾盆地的各个坳陷内新生代各时期的地层分布、沉积厚度和控盆边界断裂在各时期的空间位置以及活动性质综合分析 ,恢复了盆地新生代以来的构造演化格局。中、新生代盆地构造和沉积分布特征表明渤海湾盆地是一个中、新生代叠合盆地。

Based on the analysis of distribution of upper Jurassic and lower Cretaceous strata and basin-controlled faults,Tanlu fault zone strike slip to develop the three NW-trending grabens from north to south western to Tanlu fault zone in late Jurassic and early Cretaceous,which are Bohai graben,Jiyang graben and Luxinan graben.Based on the analysis of regional geology,the basic tectonic pattern of Bohai basin is the Cenozoic basin pattern since early Paleogene.The outline,structure,deposit characteristics and heat flow distributions show that the basin is pull-apart basin in Cenozoic time.The tectonic evolution pattern can be reconstructed based on the analysis of Cenozoic strata,deposit thickness,location and activity of basin-controlled faults in the different depresses in Bohai basin.The characteristics of structure and depositment in this Mesozoic and Cenozoic time show that Bohai basin is a Mesozoic and Cenozoic composite basin.