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滁河断裂特征研究及其意义
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摘要
本文完成了滁河断裂(巢湖地区青苔山——草鞋岭)段的构造填图,发现滁河断裂在该区段有多条产状一致、性质相同的断层组成,它们在剖面上构成叠瓦状组合;该断裂以脆性破裂为主,构造岩发育,主要为构造角砾岩、碎裂岩和碎粉岩,其中发育了三条规模相对较大的构造岩带,这些角砾岩带分别代表了三条强变形带。在此基础上,查明了滁河断裂的特征(几何学、运动学),对滁河断裂构造岩特征进行了探讨,提出了这些构造岩经历了多期断裂叠加;在野外对多条断层的擦痕进行了统计、测量并利用法国巴黎南方大学研制的计算机程序反演了研究区内古应力场特征及演化过程,在综合前人对该区动力学背景研究的成果基础上,探讨了滁河断裂的演化过程及各阶段特征,即滁河断裂经历了造山期的逆冲挤压、晚侏罗世末—早白垩世初的左行平移、早白垩世—古近纪时期的伸展正断及新近纪以来的逆冲挤压活动。在对滁河断裂研究的基础上,认为该断裂属于下扬子区的一条边界断裂,它控制着北西侧滁-全坳陷的沉积、影响着南东侧巢-含隆起的构造变形。作为郯庐断裂系的重要组成部分,与郯庐断裂带的构造特征和演化方面有着良好的一致关系。
Based on the tectonic mapping of the Chuhe fault (from Qintaishan to Caoxielin in Chaohu area),this paper finds out the Chuhe fault is composed of several faults which have the same occurrences and characters, and to form the imbricate structure in sections; The brittle fracture gave priority to this fault, the tectonite are developed, mostly such as the tectonic breccia , the cataclasite and smithereens, and three large tectonite zones are developed in it, these breccia zones are separately represented the three strong deformation belts.
     On this basis, the characteristics of the Chuhe fault (Geometry and kinematics) are found out, the characteristics of the tectonite are discussed, and these tectonites experienced several issues of the fault overlay on it; In the field, the scratchs of many faults are statisticed and measured, then , this paper utilized the programme to inversing the ancient stress field’s evolution of the study area by the computer program developed by Southern University in Paris, France.
     On the foundation of the dynamics background by our predecessors , the evolution process and characteristics of each phases are discussed, that is to say , the Chuhe fault zone has experienced four periods, the thrust extrusion during the orogeny period , the sinistral strike-slip during Late Triassic to Early cretaceous; the extend down fault during Early Cretaceous and resulted in the sinistral strike-slip movement; the extend down fault during Early Cretaceous to the Paleocene ;the thrust extrusion during the Neogene.On the foundation of research on the Chuhe fault , it is considered that it is a boundary fault in the Lower Yangtze area, which controlled the deposition of Chu-Quan seg in the northwest and affected the tectonic deformation of the Chao-Han heave in the southeast. As an important part of the Tan-Lu fault zone ,it has good consistency with the Tan-Lu fault zone in the structural characteristics and evolution.
引文
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