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黔南地区发育东西向的古生代正断层以及南北向的中、新生代逆冲断层和褶皱。通过对地层、褶皱和断层的平面展布、野外地质调查以及地震剖面的解释,结合雪峰隆起的逆冲推覆特征,研究黔南地区古生代正断层对构造特征的制约作用。研究结果表明东西向的古生代正断层在中、新生代的构造变形过程中起构造转换带的作用。通过建立区内构造转换带的几何学模型,对地震线上的构造变形特征进行了解释。在构造转换带(正断层)附近,断层上盘逆冲推覆不明显;在远离断层处,逆冲断层和与断层相关的褶皱发育。随着距离断层面越来越远,构造转换带(正断层)下盘地层的逆冲推覆特征逐渐消失。
The Qiannan area developed the east-west Paleozoic normal faults and the north-south Meso-Cenozoic thrust faults and folds. Through the plane distribution of strata, folds and faults, the field geological survey and the interpretation of seismic profiles, combined with the thrust-nappe characteristics of the Xuefeng uplift, the paper studies the constraints on the tectonic features of the Paleozoic normal faults in Qiannan area. The results show that the east-west Paleozoic normal faults play the role of structural transition zone during the Meso-Cenozoic tectonic deformation. Through the establishment of the geometric model of structural transition zone in the region, the tectonic deformation characteristics of the seismic line are explained. In the vicinity of the structural zone (normal fault), thrust fault nappe is insignificant; fault away from the fault, thrust faults and fault-related fold development. With the farther and farther away from the fault plane, the features of thrust nappe in the lower plate of structural transition zone (normal fault) gradually disappear.