东至断裂带构造变形特征及其构造演化  

Tectonic evolution and structural deformation characteristics of the Dongzhi fault zone

作　　者：胡召齐[1] 朱强[1] 施珂 李孜腾 乐成生 江来利[1] Hu Zhaoqi;Zhu Qiang;Shi Ke;Li Ziteng;Le Chengsheng;Jiang Laili(Anhui Institute of Geological Survey, Anhui Continental Mineralization Research Center, Hefei 230001;Anhui Nuclear Exploration Technology central Institute, Wuhu, Anhui 241000)

机构地区：[1]安徽省地质调查院,安徽省大陆成矿作用研究中心,合肥230001 [2]安徽省核工业勘查技术总院,安徽芜湖241000

出　　处：《地质科学》2019年第3期893-909,共17页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：安徽省国土资源科技项目“东至断裂带构造变形及演化与成矿作用研究”(编号2015-k-5)资助。

摘　　要：东至断裂带是皖西南一条重要的北北东向断裂带。详细的构造解析表明,该断裂带主要经过3期构造变形,分别是发生在晚侏罗世末—早白垩世初的左行平移断层、早白垩世期间的伸展构造和晚白垩世—新生代的右行平移断层。通过断层擦痕矢量反演和断层叠加改造关系分析,认为东至断裂带及其两侧多期构造变形对应的区域应力场分别为近南北向挤压、北北西—南南东向挤压、北西—南东向伸展和近东西向挤压应力场。东至断裂带的形成和演化与郯庐断裂带相似,主要与华南与华北板块俯冲碰撞、伊泽奈崎板块和古太平洋板块向欧亚板块俯冲碰撞与弧后扩张、及印度板块向北碰撞后产生向东的构造挤出等多构造体制共同作用有关。The Dongzhi fault zone is one of the important tectonic fracture zones with brittle NNE-striking slip properties in the southwest region of Anhui Province. Detailed structural analysis indicate that the fault zone experienced three-stage tectonic deformations primarily, including extensive and intense sinistral strike-slip movement occurred at the Late Jurassic to the earliest Early Cretaceous, extensional fault during the Early Cretaceous, and dextral strike-slip brittle structures at the Late Cretaceous to the Cenozoic. Based on the inversion of fault slickenside vector and the analysis of fault superposition and reconstruction relation, it is demonstrate that the regional stress field corresponding to the multi-stage deformation are as follows: nearly N-S compression, NNW-SSE compression, NW-SE extension, and nearly E-W compression. The formation and evolution of the Dongzhi fault zone is similar to the Tan-Lu fault zone, mainly controlled by various tectonic systems, including the collision between the North China and South China plate, subduction of the Izanagi plate and paleo-Pacific plate to the Eurasian plate, back arc expansion of the Pacific plate, and eastward tectonic extrusion resulted from the northward collision of the India plate.

关 键 词：东至断裂带 构造变形 构造演化 板块俯冲碰撞 

分 类 号：P542[天文地球—构造地质学]