云南澜沧江地区团梁子-大新山变质岩带变形特征研究

Study on the Deformation Characteristics of Tuanliangzi-Daxinshan Metamorphic Belt in Yunnan Lancang River Area

澜沧江地区团梁子-大新山变质岩带由含石英脉为主的千枚岩组成,该变质岩带分布于近南北向的澜沧江断裂带的东缘,主要由一系列叠瓦状的逆冲断层组成。变质岩带中石英脉体发生多期次变形。研究区内石英脉和云母发生的构造变形指示该韧性剪切带为西南向北东右行斜冲。显微镜下绢云母的"S-C"组构特征显示左行的现象,则说明该韧性剪切带受到澜沧江断裂带左行走滑的影响。

Tuanliangzi-Daxinshan metamorphic belt in Yunnan Lancang River area mainly consists of quartz phyllite, which is distributed in the eastern margin of the Lancang River fault zone near the north-south direction, mainly composed of a series of imbricated Thrust. Multi-stage deformation of quartz veins in metamorphic belt. The tectonic deformation of the quartz veins and mica in the study area indicates that the ductile shear zone is righted-incline thrust from the southwest to northeast The ＂S-C＂ fabric of sericite under the microscope showed that the ductile shear zone is affected by the left strike slip of the Lancang River fault zone.