华北串岭沟组软沉积物变形构造及其构造古地理意义

华北古陆北缘中元古代串岭沟组是整个华北古陆沉积环境从以滨浅海陆源碎屑岩为主体的沉积体系向以碳酸盐岩为主体的陆表海沉积体系的转折点。串岭沟组发育了大量的软沉积物变形构造:水塑性变形构造,液化构造,流化构造,均是与地震驱动相适配的变形构造,它们赋存于特定的层内,并在空间上呈规律变化,为典型震积岩。地震中心主要为蓟县—兴隆区域,东西向展布的断裂控制相带分布,南北向控制沉积类型。软沉积变形构造可以作为重要沉积标志来限定大陆裂解引发的伸展构造运动时间。因此综合研究串岭沟组发育的软沉积物变形构造类型、特征、层位和空间位置对于认识原型盆地的断裂构造活动特征具有重要意义。

Soft sediment Structures Developed in Northern part of North China Paleocontinent and Their Constraint on Geodynamic Environment of Sedimentary Basin

The Chuanlinggou Formation of the Mesoproterozoic stratum which developled in the northern part of the North China Paleocontinent was the turning point which the sedimentary system change from littoral neritic terrigenous clastic rocks to epicontinental sea carbonatite rocks. Though some liquefaction structures which developed at the bottom of the Chuanlinggou Formation have been performed to reveal the seismogenic origin, but very few work on other soft sediment deformation structures, such as hydro plastic deformation and fluidization have been done. We study such a comprehensive study on types, features, layers, and spatial location of soft sediment deformation structures developed in the Chuanlinggou Formation has great significance for understanding the characteristics of fault activity in prototype basin.