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郯庐断裂西徐州—宿州地区存在着一个向西突出的弧形构造.其东侧后缘为倾向腹地的双冲构造(hinterland dipping duplex),前缘为背驭式的叠瓦扇(piggyback imbricate fan)。东西向的不老河断层和宿北断层将其分为具有不同发育特征的三段。这是华北板块与扬子板块斜冲对接过程中.由于双沟推覆体向NW的反向推力.由东向西间歇式跳跃发展而形成的。该构造后期还被前缘的反向断层、前渊的重力滑动构造和腹地的指状断陷盆地所复杂化。这是不同于Boyer和Elliott简单模式的一种更有普遍意义,也更有代表性的推覆构造。
There is an arc-shaped arc structure striking westwards in the West Xuzhou-Suzhou region of the Tancheng-Luchuan fault.The trailing edge on the east side is hinterland dipping duplex, and the leading edge is the piggyback imbricate fan). The east-west Buluhe fault and the northern fault divide it into three sections with different developmental characteristics. This is the process of oblique docking between the North China Plate and the Yangtze Plate, due to the backward thrust of the Shuanggou nappe to the NW, formed by intermittent jump development from east to west. The later period of the structure was also complicated by reverse faults in the front, gravitational sliding structures in the foreland, and finger-rifted basins in the hinterland. This is a more generalized and representative form of nub that differs from Boyer and Elliott’s simple model.