米仓山与龙门山结合部构造分带性特征

Tectonic Zonation in the Junction of the Micang Mts with the Longmen Mts

通过褶劈理化、叠加变形、褶皱和破裂等构造发育强度、构造形迹、岩性地层单元等研究认为,米仓山与龙门山结合部具有明显的构造分带性,从北往南构造变形强度逐渐减弱,大致可分为四个构造带。这种分带变形特征是由于秦岭、龙门山、米仓山不同时期综合作用的结果,并主要受秦岭构造带控制,往南受龙门山和米仓山构造的改造和限制作用,变形强度逐渐减弱,形成分带性特征。

Study of structure and lithostratigraphy indicates that tectonic zonation comes into existence in the junction of the Micang Mts. with the Longmen Mts.. It may be divided into 4 tectonic zones with gradually weakened deformation southwards which was controlled by the Qinling tectonic belt and reformed by the Longmenshan and Micangshan structures. These 4 zones are： 1） permeating crenulation cleavage zone with multi-phase fault activity and metamorphic penetration crenulation cleavages, 2） fold-fault zone with superimposed, overturned, inclined folds and decollement deformation, 3） fold deformation zone with open anticlines and synclines and 4）whole uplift zone with near horizontal and river incision and large box shape anticline.