| 东至断裂带构造变形特征及其构造演化 |
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| 引用本文： | 胡召齐,朱强,施珂,李孜腾,乐成生,江来利.东至断裂带构造变形特征及其构造演化[J].地质科学,2019,54(3):893-909. |
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| 作者姓名： | 胡召齐 朱强 施珂 李孜腾 乐成生 江来利 |
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| 作者单位： | 安徽省地质调查院,安徽省大陆成矿作用研究中心 合肥,230001;安徽省核工业勘查技术总院安徽芜湖 241000 |
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| 基金项目： | 安徽省国土资源科技项目 |
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| 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。
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| 关 键 词： | 东至断裂带 构造变形 构造演化 板块俯冲碰撞 |
| 收稿时间： | 2019-03-10 |
Tectonic evolution and structural deformation characteristics of the Dongzhi fault zone |
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| Hu Zhaoqi Zhu Qiang Shi Ke Li Ziteng Le Chengsheng Jiang Laili.Tectonic evolution and structural deformation characteristics of the Dongzhi fault zone[J].Chinese Journal of Geology,2019,54(3):893-909. |
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| Authors: | Hu Zhaoqi Zhu Qiang Shi Ke Li Ziteng Le Chengsheng Jiang Laili |
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| Institution: | Anhui Institute of Geological Survey, Anhui Continental Mineralization Research Center, Hefei 230001;Anhui Nuclear Exploration Technology central Institute, Wuhu, Anhui 241000 |
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| Abstract: | 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. |
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