【摘要】 合肥盆地由于构造演化过程复杂、古生物资料缺乏等,在地层时代研究上存在着诸多疑义;本文以地震层序为框架辅以生物地层学和岩石地层学等证据,参照区域构造事件,建立了新的地层层序,主要提出了:①周公山组和圆筒山组的岩石学、地球物理学和古生物学等特征相似,二者合并统称为圆筒山组,原先的周公山组和圆筒山组分别视为该地层组的上部岩性段和下部岩性段,时代为中侏罗统;②朱巷组与黑石渡组属于异地同期异相,为上侏罗统;③响导铺组为下白垩统;④定远组与戚家桥组属于异地同期异相,为古近系;这是探索以层序地层学方法为主判识地层时代的综合性研究成果,为低勘查程度地区的地层时代确定提供了一个实例,也为大别山造山带、郯—庐断裂带中生代构造演化研究提供了依据。更多还原

【Abstract】 Many disputes still exist in the stratigraphic zonation and correlation of Hefei Basin due to its complex tectonic evolution and the lack of paleontological data. This paper established new stratigraphical sequences based on seismic sequences, in combination of the evidence from biostratigraphy and lithology and regional tectonic movements. The following are proposed: ① The Middle Jurassic Zhougongshan Formation and Yuantongshan Formation are classified to Yuantongshan Formation due to their similar lothological, geophysical and paleontological features, which could be respectively taken as the upper and lower parts of Yuantongshan Formation. ② The Zhuxiang Formation and Heishidu Formation are contemporaneous difference facies in different places, and are in the Upper Jurassic stratum. ③ The Xiangdaopu Formation is the stratum of the Lower Cretaceous. ④ The Dingyuan Formation and Qijiaqiao Formation are contemporaneous difference facies in different places, and are in the Tertiary stratum. These new recognitions provide a guideline for stratigraphical study in Hefei Basin, stratigraphical sequence determination in immature exploration areas and tectonic evolution study of Dabieshan orogen and Tan-Lu fault zone.更多还原