东昆仑五龙沟金矿矿集区韧性剪切带构造变形特点研究  

A study of the deformation characteristics of the ductile shear zone in the Wulonggou gold ore concentration area, East Kunlun,Qinghai

作　　者：寇林林[1] 张森[1] 钟康惠[2] 田承盛 

机构地区：[1]沈阳地质矿产研究所,辽宁沈阳110034 [2]成都理工大学地球科学学院,四川成都610051 [3]青海第一地质矿产勘查大队,青海平安810600

出　　处：《中国地质》2015年第2期495-503,共9页Geology in China

基　　金：青海省国土资源厅资助项目"青海省都兰县五龙沟地区金矿成矿规律研究及大比例尺成矿预测"(青国土资矿[2008]24)资助

摘　　要：野外构造解析和显微构造分析表明,五龙沟地区经历了长期构造演化,具有多层次多期构造作用产物叠生特点。可分为早印支期（240 Ma左右）及其以前的韧性变形;晚印支—早燕山期的（235～197 Ma）的脆韧性变形;晚燕山期以来,尤其早-中喜马拉雅期（51～21 Ma）的脆性变形。晚印支期—早燕山期的脆-韧性变形,与造山隆升相伴,表现为先存变质核杂岩构造北东翼构造岩类的褶皱、断裂,奠定了五龙沟地区北西西向的构造主线,即形式上的数条北西西向韧剪带平行展布,从韧性变形、韧-脆性变形到脆性变形的构造运动依次为左行正滑→左行逆冲→右行正滑。Field structural analysis and microstructural analysis show that Wulonggou area has experienced a long- term structural evolution, characterized tectonically by multi- level and multi- storeyed products. Its can be broadly divided into the ductile deformation that occurred in early Triassic（240 Ma ±） and its previous period, late Indosinian- early Yanshanian（235- 197 Ma）brittle- ductile deformation; brittle deformation that occurred after late Yanshanian period, especially in the early- middle Himalayan period（51- 21 Ma）. Late Triassic- Early Yanshanian brittle- ductile deformation was accompanied by orogenic uplift,and its performance was exhibited by the folding and faulting of the pre- existing metamorphic core on the northeast wing of thetectonites, which laid the foundation of the NWW- trending main tectonic line in the Wulonggou area, i.e., a number of formal NWW- trending ductile shear zones exhibit parallel distribution, with the tectonic activities developed in order of left- handed positive sliding- left-handed thrusting →right-handed positive sliding.

关 键 词：构造演化 脆韧性变形 构造运动 晚印支期—早燕山期 青海省 

分 类 号：P618.51[天文地球—矿床学]