郯庐断裂带南段与大别──胶南造山带构造复合(叠加)的显微构造证据  

A MICRO-STRUCTURAL EVIDENCES OF TECTONIC SUPERIMPOSITION (COMPOUND) BY SOUTH PART OF TANCHENG-LUJIANG FAULT BELT AND DABIE-JIAONAN OROGENIC BELT, CHINA

作　　者：杨晓勇[1] 杨学明[1] 刘德良[1] 王奎仁[1] 戴金星[2] 

机构地区：[1]中国科学技术大学地球和空间科学系,合肥230026 [2]中国石油天然气总公司勘探开发科学研究院,北京100083

出　　处：《地球物理学报》1998年第S1期123-132,共10页Chinese Journal of Geophysics

基　　金：国家"九五"重点科技攻关项目!96-101;自然科学基金!48970172

摘　　要：对那庐断裂带南段构造岩特别是中深层次韧性剪切带中的糜棱岩进行了研究自北向南于部庐断裂带主干断裂沿线选取6条有代表性的初一脆性剪切带进行地质测量，应用高分辨透射电子显微镜对构造岩中变形石英的位错结构进行观察，求得了韧性剪切作用下构造岩石所受的古差异应力和应变速率等一系列应变参数从显微构造角度提出了郊庐断裂带与大别一胶南造山带构造复合（叠加）的证据：构造岩石的一组应变参数是郊庐断裂带的产物，严格受其中的韧性剪切带控制。The paper focuses on the mylonites in the ductile shear zones in the southern part of Tancheng-Lujiang fault belt in east China. On the basis of field survey, several of the typical ductile shear zones were chOSen and more than 30 typical Samples collected for deailed study. Using the TEM analysis on the deformed minerals in the mylonites and the wall rocks,the chalacteristics of the dislocation in quartz has been studied and the plastic deformation of the mylonites discussed. The parameters of the differential paleo-stress and the strain rate in the mylonites have been calculated. Combined with the results of deformed Parameters of thedeep faults belowing to Dabie-Jiaonan orogenic belt, it has presented the micro-structural evidences of the tectonic superimposition (compound) of Tancheng-Lujiang fault belt and Dabie-Jiaonan orogenic belt, i. e., the deformed Parameters of the tectonic rocks can be divided into two groups, the larger one belongs to the result of Tancheng-Lujiang fault belt,which is strictly controlled by the ductile shear zones; the smaller to the result of DebiJiaonan orogenic belt. Base on the general conditions of the geological setting in the adjacent area the strain history and ore-forming backgroUnd have been discussed in this Paper.

关 键 词：韧性剪切带 应变参数 构造叠加 显微构造 郯庐断裂带 大别—胶南造山带 

分 类 号：P542.2[天文地球—构造地质学]