大姚六苴砂岩型铜矿区构造岩矿物岩石学特征与地质意义  

Mineralogical-Petrological Characteristics of Tectonites from Dayao Liuju Copper Ore-District, Central Yunnan Province, China and Their Geological Significance

作　　者：邹海俊 韩润生[2] 方维萱[3] 胡瑞忠[1] 刘梦琼[4] ZOU Hai-jun;HAN Run-sheng;FANG Wei-xuan;HU Rui-zhong;Liu Meng-qiong(State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China;Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;Geological Survey Center for Non-ferrous Mineral Resources, Beijing 100012, China;Architecture ＆ Engineering Design Institute of Yunnan Province, Kunming 650021, China)

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002 [2]昆明理工大学有色金属矿产地质调查中心西南地质调查所,云南昆明650093 [3]有色金属矿产地质调查中心,北京100012 [4]云南省建筑工程设计院,云南昆明650021

出　　处：《矿物学报》2017年第5期528-535,共8页Acta Mineralogica Sinica

基　　金：中国科学院地球化学研究所博士后研究经费(编号:1191030078);国家危机矿山接替资源勘查项目(编号:20089943);国家自然科学基金项目(批准号:41572060);云南省矿产资源预测评价工程实验室项目;云南省;校创新团队项目

摘　　要：大姚六苴铜矿区是楚雄盆地典型的砂岩型铜矿床聚集区,矿床(体)在燕山期沉积成岩成矿作用的基础上,受到喜山运动构造-成矿作用的改造,构造控矿特征明显。基于矿床成矿地质特征与褶皱、断裂等构造变形分析,着重采用构造岩显微构造特征和构造岩石英脉ESR测年方法,研究了构造岩矿物岩石学特征及其地质意义,讨论了扩展构造岩矿物岩石学研究的途径。通过构造岩显微组构研究认为,显微构造存在NE-SW向、近EW向、NW-SE向和近SN向主压应力;含矿流体受构造动力的驱动,在紫红色砂岩蚀变为浅色砂岩的过程中伴随着硅化和碳酸盐化发生沉淀成矿。构造岩ESR测年结果反映该区经历了喜山运动早期(46.8±4.5~56.0±5.6Ma)、中期(32.4±3.0~42.3±4.1Ma)、晚期(23.5±2.4~29.3±3.0Ma)三期构造变形改造作用和热液活动。As a typical sandstone-type copper ore district in the Chuxiong Basin, Dayao Liuju copper ore-deposits and ore-bodies formed with tectonic-metallogenic mineralization during the Himalayan movement on the basis of sedimentation-diagenesis mineralizing at the Yanshan movement stage, which leads to show structure-controlling features. Based on the geological and ore-forming characteristics and structural deformation analysis results of macro-structures including folds and faults in Liuju copper ore-district, Dayao, it is emphasized to use ways by microstructures and ESR dating to reveal the mineralogical-petrological characteristics and geological significance of the tectonites. We also discussed how to expand the study on tectonite petrology in the future. Oriented tectonites＇ micro-structural marks indicate that there exist principal compressive stresses as the NE-SW, E-W, NW-SE and S-N trends; the ore bearing fluid should be driven under the tectonic stresses to deposit ores and form silicification and carbonation alteration when the purple sandstones were altered into light-colored. The tectonite ESR dating results reflect that the district was experienced 3 stages of structural deformation and thermal-fluid activities respectively due to the early stage （46.8＋±4.5～56.0±5.6 Ma）, medium stage （32.4±3.04～42.3±4.1 Ma） and late stage （23.5±2.4～29.3±3.0 Ma） of the Himalayan movement. The ESR dating could be an effective chronological method to study the regional structure evolution. And the mineralogy- petrology research should be complement and certification items for matching the study on macro-structure deformation.

关 键 词：构造岩 矿物岩石学 显微构造 ESR测年 大姚六苴铜矿区 

分 类 号：P313[天文地球—固体地球物理学] P583[天文地球—地球物理学]