郯庐断裂带张八岭隆起段走滑运动与合肥盆地的沉积响应

安徽北部的郯庐断裂带位于东侧的张八岭隆起与西侧的合肥盆地之间。断裂带内走滑糜棱岩、超糜棱岩及伴生岩浆岩的同位素测年,表明其走滑时间为早白垩世。一系列构造、沉积学的研究反映,郯庐断裂带在早白垩世的走滑运动,使合肥盆地东侧出现了北北东向延伸的张八岭走滑隆起,成为合肥盆地的沉积物源区。盆地东部相应出现了由下白垩统朱巷组充填、北北东向的大桥-肥东凹陷。该凹陷属于走滑挠曲盆地,其出现于张八岭走滑隆起西侧的走滑挠曲拗陷之中。

Strike-Slip Movement on the Zhangbaling Uplift Segment of the Tan-Lu Fault and the Depositional Response in the Hefei Basin

The Tan-Lu fault zone in northern Anhui occurs between the Zhangbaling uplift belt in the east and the Hefei basin in the waet.Isotopic dating of strike-slip mylonites, ultramylonite as well as associated igneous rocks in uplift belt indicated that the strike-slip displacement of the fault zone took place in early Cretaceous. A series of structural and sedimentary studies demonstrated that the early Cretaceous strike-slip movement on the Tan-Lu fault zone caused the Zhangbaling uplift belt with a NNE strike to the east of the Hefei basin, which therefore became source region of the basin. Correspondingly NNE Daiqiao-Heidong depression with deposition of the Zhuxiang formation appeared in the east of the Hefei basin. The depression was considered as a strike-slip flexure basin. It was developed in a strike-slip depression to the west of the Zhangbaling strike-slip uplift belt.