摘要
合肥盆地白垩纪地层分为二统四组,岩性特征明显,物源主要来自大别造山带和张八岭造山带。白垩纪初期在大规模右旋走滑拉伸条件下的伸展变形,导致地下热能释放,形成盆地。早白垩世由于盆山幕式构造作用和深断裂的走滑作用,造成盆地的差异性隆升。晚白垩世合肥盆地转入应力松驰、整体不均匀抬升的坳陷初始阶段。末期由应力松驰转为受SW-NE向挤压应力的发展阶段,形成箕状断陷盆地。
The Cretaceous strata of the Hefei Basin are divided into two series and four formations with distinctive lithological features, which are mainly sourced from the Dabie and Zhangbaling organic belts. Extensional deformation by large-scaled right-lateral strike slip at the initial period of Cretaceous led to release of underground thermal energy forming the basin. Differential uplift of the basin was resulted from basin-range episodic tectonism and deep-fault strike slip at the early Cretaceous. The basin entered the stage of initial depression due to stress relief and overall uneven uplift at the late Cretaceous. Finally, the stress relief turned to SW-NE trending compression giving birth to the dustpan-like rift basin.
出处
《安徽地质》
2007年第4期241-243,269,共4页
Geology of Anhui
关键词
白垩纪地层
盆地演化
合肥盆地
Hefei Basin
Cretaceous strata
basinal evolution
