临清坳陷变换构造研究

TRANSITION STRUCTURES IN LINQING DEPRESSION

讨论了临清坳陷内3个规模较大的调节构造带,即封丘左行传递带、马陵横向背斜调节带和夏津—腰站斜向背斜调节带的构造特征及成因机制。临清坳陷内"东西分带、南北分块"的构造特征,是由平行于裂谷轴方向的NNE(NE)向伸展正断层和垂直(或斜交)于裂谷轴方向的NW(NWW)斜向滑移断层及横向构造带等共同作用造成的;区内3个规模较大的调节构造带是造成"南北分块"的构造原因,这些调节构造带垂直或斜交于裂谷方向,通过传递带或调节带的方式调节不同伸展域间的应变,从而使区域应变守恒。

This paper discusses the structure features and mechanism of three larger accommodation zones in Linqing Depression,such as Fengqiu sinistral transfer zone,Malin transverse anticlinal accommodation zone and Xiajin—Yaozhan oblique anticlinal accommodation zone.The structure features of 'dividing in E—W direction and segmenting in S—N direction' in Linqing Depression were caused by the combination of NNE(NE)-trend normal faults,parallel to the rift axis and NW(NWW)-trend oblique-slip faults and transverse structures,perpendicular(or oblique) to rift axis.The three larger accommodation zones in the study area structurally caused 'segmenting in S—N direction'.The accommodation zones,perpendicular or oblique to the rift direction,had accommodated the adjacent extended areas' strain by transferring or accommodating action.Moreover,they kept the strain balance in the vicinity of regions.