Late Mesozoic to Cenozoic extension and strike slip structures and deep background of Bohai Bay Basin

The Bohai Bay Basin is a Cenozoic active rift basin superposed on the Early Cretaceous passive rift basin with strike slip action run though thoroughly, especially in area east of the Lanliao-Yanshan strike slip fault. So this rift basin shows significant strike slip characteristics. The extension and the strike slip action increased and decreased each other, made the extensional structure and strike slip structure superpose, transfer and cut. Meanwhile, the transfer zone in the basin was also generated. The changes of the Pacific-Eurasian plate subduction direction and velocity since ~ 140 Ma, the roll back of the Pacific plate, and the slab window effect, together with the Middle Eocene Indo-Eurasin plate collision resulted in the asthenosphere mantle upwelling, are the deep back ground of the basin formation. Also the strike slip of extensive sinistral in Early Cretaceous, weak sinistral in Paleocene-Early Eocene, and dextral in Middle Eocene of the Tanlu fault profoundly controlled and influenced the basi