合肥盆地侏罗纪的沉积格局与盆地成因

Depositional pattern and basin origin of Jurassic in Hefei basin

根据合肥盆地一系列地震剖面对侏罗系残留厚度及沉积相的恢复,盆地内侏罗系呈现为南厚北薄、东厚西薄 的格局,在盆地南部和东部同时存在着沉积-沉降中心带,大别造山带和张八岭隆起都为盆地的重要物源区。盆 地侏罗纪时总体上为大别造山带北部的前陆盆地,同时东部还出现了受控于郯庐断裂带的走滑挠曲盆地。盆地内 侏罗系的沉积,一方面指示了大别造山带在早侏罗世出现了快速隆升;另一方面表明郯庐断裂带起源于华北与华 南板块的陆-陆碰撞中。

According to Jurassic remained thickness and sedimentary facies recovered from a series of seismic sections in Hefei basin, Jurassic sediments show thickness increasing towards south and east. Deposition-depression central belts occurred in the south and east of the basin. The Dabie orogenic belt and Zhangbaling uplift were important provenances to the basin. The basin in Jurassic was a foreland one to the north of the Dabie o-rogenic belt in general, and its eastern part was a strike-slip flexural basin controlled by the Tan-Lu fault zone. The Jurassic sediments in the Hefei basin revealed not only rapid uplifting of the Dabie orogenic belt in Early Jurassic, but also origin of the Tan -Lu fault zone during continent-continent collision between the North and South China plates.