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本文就郯庐断裂带南段东部的黄栗树—破凉亭断裂带内构造岩,特别是中深层次的韧性剪切带中的糜棱岩进行了细致的野外考察、采样,在室内显微构造研究的基础上,选择有代表性的样品和视域进行透射电镜制样观察,在对各超显微构造特征分析归纳的基础上,讨论了构造岩的塑性变形特征,并对构造岩的应变参数(最大差异应力和应变速率)进行了计算,从显微—超显微构造角度仔细研究该断裂带内典型的构造岩的变形特征,初步判明断裂带的性质和运动发展历史,证实了该断裂带是形成在较深构造层次的一条以韧性变形为主的脆—韧性剪切带,应变形式为简单剪切。应变参数的计算结果表明,自东向西从前陆褶皱冲断带根部到后缘带,构造岩中石英的位错密度逐渐减小,最大差异应力逐渐降低。
In this paper, detailed investigation and sampling of the mylonites in the Huangshu-Pozhaiting fault zone in the eastern part of the southern section of the Tanlu fault zone, especially in the mid-deep ductile shear zone, Based on the analysis of the microstructural features of the super-microstructures, the representative samples and field of view were selected for TEM observation. The plastic deformation characteristics of the tectonic rocks were discussed, and the strain parameters of the tectonic rocks (Maximum differential stress and strain rate) were calculated. The deformation characteristics of the typical tectonic rocks in this fault zone were studied carefully from the perspective of microscopic-supermicrostructure. The nature of the fault zone and the history of the movement were preliminarily confirmed, The band is a ductile-ductile shear zone formed mainly at the ductile deformation at a deeper structural level. The strain form is a simple shear. The calculation results of strain parameters show that the dislocation density of quartz in tectonic rocks decreases gradually from the root to the trailing edge of the foreland fold-thrust belt from east to west, and the maximum differential stress decreases gradually.