冀中拗陷北部伸展构造样式

冀中拗陷北部地区上地壳伸展构造是断陷盆地的构造样式(style)之一，它是以大兴铲状(Listric)正断层为主体，牛东断层与其呈锐角相交构成帚状样式的大型伸展构造。在其发育过程中，首先是大兴断层上盘岩体沿拆离面滑移形成大型箕状断陷，然后上盘岩体滑移、旋转、掀斜，形成了牛驼镇凸起，从而导致了原先的统一断陷解体，分割成两个具有不同发育历史和构造形态的廊固、霸县断陷。因此，研究伸展构造对能源地质和灾害地质均有重要的意义。

Extensional tectonics style in north part of the Mid Hebei depression,

The extensional tectonics in upper crust in the north Mid-Hebei depression is one of the tectonics styles which created faulted-basins.It is a huge "broom-like" extensional tectonics dominated by the Daxing listric fault,which is intersected in an acute angle by the Niudong fault.It underwent the evolution periods: (1) the upthrown side of the Daxing fault moved along decouplng surface to create a huge half graben-like basin, and(2)the upthrown side still moved,revolved and tilted to become the Niutouzhen uplift, which divides the huge half graben-like basin into the Langgu depression and the Baxian depression which are different from each other in evolution history and geological structure.The study of extensional tectonics is of great significance to both energy resource geology and catastrophic geology.