内蒙古获各琦多金属矿区新元古代渣尔泰群变质—变形及硫化物矿床对变质作用改造的响应  

The Metamorphism and Deformation of the Neoproterozoic Zhaertai Group and Transformation Response to the Sulfides Ore-deposit of Huogeqi CopperZinc Polymetallic Deposit in Inner Mongolia

作　　者：徐多勋 刘俊来[2] 杨拴海[1] 王东升[2,3] 高鑫磊[2] 王文龙[2] 李国英[1] 

机构地区：[1]武警黄金第五支队,陕西西安710100 [2]中国地质大学地球科学与资源学院,北京100083 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《黄金科学技术》2015年第1期24-33,共10页Gold Science and Technology

摘　　要：获各琦矿区新元古代渣尔泰群变质—变形作用强烈,后期变质—变形作用使矿体接受了多期次的变形改造。露头构造解析、显微构造观察以及变形石英EBSD组构分析揭示出矿区主要经历了2期不同温压条件下的剪切作用,第一期为NW-SE向高温剪切作用,变形温度在600℃左右;第二期为NE-SW向低温剪切作用,变形温度较低。依据硫化物显微组构等特征分析,初步认为矿体遭受后期区域变形改造明显,矿体的贫化和富集是变质—变形作用导致硫化物活化、迁移和重新就位的结果。Through analysis from outcrop to microscopic scales,and quartz c-axis fabrics,we consider the Neoproterozoic rocks in the Huogeqi ore field experienced multi-phase deformation and metamorphism.Two phases of deformation contribute to the different structural characteristics in northern,central and southern belts.The first phase of deformation is characterized by NW-SE shearing at deformation temperature at about 600 ℃.The second phase of deformation is evidenced by NE-SW shearing at ralatively low temperatures.Microscopic features of the deformed sulfides indicate that the orebodies were transformed by the multi-phase deformation.Enrichment and depletion of the orebody may result from the physical remobilization caused by the shearing.

关 键 词：构造变形 剪切变形 电子背散射衍射 变形改造 获各琦多金属矿 内蒙古 

分 类 号：P618.2[天文地球—矿床学]