摘要
郯庐断裂带于新近纪以来呈现强烈的逆冲活动,使得先存的伸展性断层产生了一系列逆冲反转构造。该逆冲活动使合肥盆地东部边缘地层被明显掀斜并产生断弯褶皱。与此同时,合肥盆地也相应遭受了挤压而反转,在合肥盆地内形成了一系列NW向左行平移断层和NNE向的宽缓褶皱构造。这些构造对油气二次运移和圈闭有利。在太平洋板块向西俯冲产生的弧后扩张使中国东部大陆受到挤压的区域动力学背景下,郯庐断裂的逆冲活动和合肥盆地反转构造在近EW向挤压应力下形成。
The Tan Lu Fault zone experienced intense thrusting since Neogene. Thus, inversion structures formed along the preexisted extensional faults, and the strata at the eastern edge of the Hefei basin were apparently tilted, giving rise to fault bend folds. Likewise,the Hefei basin was also subjected to compression and inversion, which were responsible for a series of small NW trending sinistral strike slip faults, and NNE trending arrested folds that favoured the trap and migration of hydrocarbon. The thrusting activity of the Tan Lu fault zone and the inversion structures of the Hefei basin took place in the regional dynamic setting that back arc spreading caused by westward subduction of the Pacific plate led to the almost EW compression of eastern China continent.
出处
《安徽地质》
2002年第2期81-85,共5页
Geology of Anhui
基金
国家自然科学基金资助项目(49872074)
关键词
盆地反转
逆冲构造
新近纪
合肥盆地
郯庐断裂
basinal inversion
thrust structure
Neogene
Hefei basin
Tan Lu fault
