Structural Characteristics And Tectonics Significance Of Qinglong Fault Zone, North China

The EW-strike Qinglong fault zone, which is located in Northeastern Hebei and western Liaoning, is within the eastern segment of Yanshan orogenic belt. On the basis of detailed field work and structural analysis, this paper presents a new geometrical and kinematic data that reveal the staictural characteristics of Qinglong fault zone. This fault zone is composed of numerical EW faults with an arrangement of dextral step pattern in the western part, and consists of Maquanzi-Datun fault and Tumenzi-Mingshui fault in the eastern part. Qinglong fault zone evolved successively by phases in a long term: it probably formed in the late period of Paleoproterozoic and rejuvenated in a large scale during Jurassic and Cretaceous. A right lateral strike slip, which is shown by mapview distribution of the whole fault zone, displacement of the strata, drag folding, S-C fabric and association of subsidiary faults, forms the mainly deformational mechanism. The NE-strike compressional faults are not intersected with the EW main fault zone, but a kind of transform structure resulted from its right lateral strike slip, and one of the typical example is the Mesozoic thrust systerm in the northeast side of the main fault in western Liaoning.