西藏革吉县尕尔穷铜金矿区岩石地球化学勘查异常特征及找矿方向  

Lithogeochemical Anomaly Characteristics and Ore-Search Targeting of the Gaerqiong Gold-Copper Ore District in Ge'gyai County,Tibet

作　　者：王红星[1] 姚晓峰[2] 李志军[1] 胡正华[1] 张志[1] 

机构地区：[1]成都理工大学,四川成都610059 [2]中国地质大学,北京100083

出　　处：《地球学报》2012年第4期693-702,共10页Acta Geoscientica Sinica

基　　金：中央公益性行业专项(编号:201011013-3);国家973项目(编号:2011CB403103)联合资助;西藏卓朗基矿业开发有限公司对野外工作和资料收集提供资助

摘　　要：尕尔穷矿区具有三种类型矿化:产于斑岩型中的铜钼(金)矿化、产于矽卡岩中的铜金矿化和产于构造破碎带中的铜金矿化,三种矿化类型同属斑岩成矿系统。岩石地球化学测量结果表明,矿区存在R-1、R-2和R-3等三个主要异常,三个异常区的元素分布特征大体相似,R-1由异常浓集中心向外具有Cu-Mo-Se-Te-(Bi)-Pb-Zn-As-Sb-Tl的元素分带现象,这种元素组合及分带具有高温→中低温成矿演化的特点,特征与斑岩成矿系统很相似,具有寻找斑岩型矿床的潜力;R-2异常区Te、Se、Sb、Pb、Zn等外围元素在此范围内较弱的异常和Cu、Mo的强异常表明此异常区遭受剥蚀程度较大;R-3异常区是与石英闪长岩和花岗闪长岩有关的斑岩型矿化、矽卡岩矿化和构造破碎带中的矿化,其中以矽卡岩型和构造破碎带中的矿化的找矿前景最好,深部斑岩型矿化也具有一定的找矿潜力。The Gaerqiong ore district has three mineralization types, i.e,, Cu-Mo mineralization produced in the porphyry ore deposit, Cu-Au mineralization produced in the skarn, and Cu-Au mineralization produced in the structural fracture zone. These three mineralization types all belong to the porphyry mineralization system. The results of lithogeochemical measurement shows the existence of three main anomalies, R-l, R-2 and R-3, in the ore district. Distribution characteristics of elements in three anomalous areas are on the whole similar to each other There is element zonation of Cu-Mo-Se-Te-（Bi）-Pb-Zn-As-Sb-T1 distributed from the abnormal concentration center outwards in the R-1 anomaly area, the rrletallogeny of element association and distribution is characterized by the evolution from high temperature to middle or low temperature, similar to things of the porphyry mineralization system, and hence this area has potential in search for porphyry ore deposits. The weak anomaly of such peripheral elements as Te, Se, Sb, Pb and Zn and strong anomaly of Cu and Mo in R-2 anomaly area show R-2 anomaly area has been severely denuded. R-3 anomaly area is a porphyry-type mineralization area related to quartz diorite and granodiorite, in which skarn mineralization and structural fracture zone have the best potential in search for ore deposits, and porphyry-type mineralization in the depth also has prospect for ore exploration

关 键 词：尕尔穷 铜金矿床 岩石地球化学测量 找矿方向 西藏 

分 类 号：P618.41[天文地球—矿床学] P632.2[天文地球—地质学]