The extensional activities of hefei basin occurred in the period between late cretaceous and paleogene . as a result , the extensional normal faults were took place along the pre - existing nearly ew faults and the tan - lu fault zone . the deposition of half - graben was formed 合肥盆地的伸展活动发生于晚白垩世至早第三纪，伸展活动是叠加在前两期走滑构造之上，形成了以半地堑式楔形为主的沉积。
According to the analysis of the structure deformation variant direction the structure superposition during late period , and the tectonic stress field and deformation variant field , the cover extended nearly sn direction in early stage ( d - c ) , maybe changed the direction in pernian ( especial the late permian ) , and developed some new half - graben along sn direction except the succession activity at great fault zone . the direction of compression deformation variant , however , was nearly sn direction in indo - chinese epoch , ne - sw direction in early yanshan movement epoch , nne - ssw direction in late yanshan movement epoch , and transformed from ew to sn direction in himalayan movement epoch 根据不同构造层中变形方向及后期构造叠加的分析，对本区的构造应力场及变形场进行了探讨，本区盖层早期阶段( d - c )为近南北向的伸展拉张，二叠纪(特别是晚二叠世)的伸展方向可能发生了改变，除在各断裂带继承性活动外，沿南北方向又新生了一些半地堑。而在挤压变形时，印支期主要为近南北向挤压，燕山早期为nw - se向挤压，燕山晚期为nne - ssw向挤压，而喜山运动可能经历了从ew向向sn向方向挤压的转变。
The regional structure interpretation with 3d seismic data shows that the graben and shied mode faults of the baigezhuang , which developed a series of normal faults which stroked in ne ( nee ) and dipped nw or nw , came into being in the rift development stage of ii act of the bohai bay rift basin in mesozoic and cenozoic and resulted from the protrudent boundary of the basin , i . e . the strike - slip and stretch processes of baigezhuang fault 同时，用三维地震资料进行区域构造解释分析，论述了柏各庄地区的构造样式，是中新生代渤海湾裂谷盆地的幕断陷发育阶段，同时由于盆地内凸起边界?柏各庄断层的走滑兼伸展作用，使柏各庄凸起的中生界形成垒、堑断块群构造样式，发育一系列ne ( nee )向，倾向nw或sw的正断层。
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 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。
They are paleozoic ~ early mesozoic - fold deformation and the appearance of reversed fault ; mesozoic - the beginning of graben faulting - block period ; early cenozoic - the phase of broke - the forming of block hill ; late cenozoic - the phase of segging - the forming of buried hill . we mark off five kinds of buried hill belts . they include three different kinds of trap on the basis of the cause of trap formation 本次研究在重新认识济阳坳陷区域构造背景的基础上，将济阳坳陷古生界潜山的形成过程分为四个阶段，即古生代早中生代?稳定沉降?隆升?轻微褶皱变形及逆断层发育阶段、中生代?初步断陷阶段?块断期、新生代早期?断拗阶段?块断潜山形成期以及新生代晚期?坳陷阶段?潜山定型期。
