广东阳春县永宁地区韧性剪切带的构造特征及其发展史

来源期刊：中南大学学报(自然科学版)1982年第4期

论文作者：奚小双

文章页码：136 - 142

关键词：韧性剪切带； 构造特征； 广东阳春； 糜棱岩带； 混合岩； 发展史； 永宁； 钾长石； 塑性变形； 应变椭球体

摘    要：本文确定了永宁地区的断裂带为大型韧性剪切带,论述了区域“S”型构造,小型构造和显微构造的特征,进行了定量应变分析,建立了韧性剪切带——糜棱岩带——脆性断裂带的构造史,从空间展布和时间发展中综合了断裂带构造模式。

Abstract: The structural characteristics of the basement rock formation from theearly paleozoic Sihui——Wuchuan fault zones in Yongning region, Yongchuncounty, Guangdong province, are described, and it is defined by the authorthat the tectonic pattern in its early stage is a ductile shear zone. The foli-ation in the shear zone is nearly vertical, expressing a "S" pattern on thehorizontal surface with distinct horizontal displacement. In this paper, theevidences and characteristics of the ductile shear zone are discussed in manyof its aspects including minor tectonics and microstructures. Some new methodsare developed in measurring the relative intensities of the strains. The historyof transfomation from ductile shear zone into brittle fracture zone is discussed.The structural characteristics of mylonitis zone, brittle ductile shear tectonicsand brittle faults are also described.