济阳坳陷新生代盆地结构差异性研究

Study on structural differences of Cenozoic basin,Jiyang depression

从几何特征、构造样式、伸展和沉降历史、叠置方式、主控因素与动力学机制等方面对济阳坳陷不同凹陷结构演化的差异性进行了分析。认为凹陷的长轴与短轴比体现了盆地的演化程度,控制了中央隆起带的形成;构造样式类型的差异与距郯庐、兰聊断裂的距离有关,距离越近走滑构造样式越发育,距离越远伸展构造样式越发育;凹陷伸展强度、沉积中心具有从西南向东北迁移的趋势;凹陷早期形成的半地堑被晚期发育的伸展断陷/走滑断陷叠加、改造,地质结构复杂化;郯庐、兰聊2个走滑构造体系的活动,以及深部地幔物质的上涌和迁移控制了不同凹陷成因和结构的差异。

Based on the research of structure character in Jiyang depression,the differences among different sags are analyzed in terms of geometry,style of structure,history of the extension and the sedimentation,way of overlapping,main control factor,dynamics mechanism and so on.The conclusions are that,the ratio between the length and the width of the sags reflects the evolution stage of the basin,and controls the formation of the central bulge belt.The differences between structural style are function of the distance from the Tanlu fault and the Lanliao fault,that is,the shorter the distance the more developed the translational structure.The extension strength and the sedimentary center have the trend of movement from southwest to northeast.The semi-rift valleys of the early phase are superimposed by the extensional fault and the translational fault,and the geological structure is complex.The activities of the Tanlu fault and the Lanliao fault and the bubble up of the deep earth mantle material control the causes of formation and the differences of different sags.