合肥盆地重力异常特征及其地质意义

在详细描述合肥盆地布格重力异常的分布特征的同时，给出了布格重力异常小波分析计算不同阶次细节的结果．通过不同阶次小波细节特征的比较以及同布格异常总的特征比较，得到了一些盆地边界断裂及沉积范围随时代从老到新的动态变化信息．西界断裂周集-吴集断裂可以向南延伸至大别造山带；南部边界在舒城至晓天间随时代从老到新逐渐南移，现今的边界可划到龙河口附近；东界郯庐断裂随深度从深到浅被后期改造的痕迹越来越清楚．从早侏罗世开始，盆地内沉积分布范围开始由小变大，逐渐又由大变小，由连续变得不连续．

Wavelet Analysis Results of Gravity Anomalies and Its Geological Significance in Hefei Basin

The distribution pattern of Bouguer gravity anomalies in Hefei basin has been described in detail,and the 1st order to the 4th order wavelet details were calculated. Based on the comparison of characters among different order wavelet details and with the whole character of Bouguer gravity anomalies,new information on the evolution of the boundary faults and sedimentary range was ob- tained. The west boundary fault, Zhouji-Wuji fault, could be extended to Dabie orogen. The south boundary between Shucheng and Xiaotian shifted southwards, and the current boundary could be placed around Longhekou. The continuity of the east boundary fault, Tanlu fault,becomes better as the depth increases,which illustrates that the present Tanlu fault is the compositive results of different tectonic events. Since early Jurassic, the distribution of the sediments in the basin have changed from the south basin to the whole basin firstly,and then shrank gradually and was separated into several sedimentary centers.