云南郎都铜矿地质特征与矿床成因分析  

Geological Characteristics and Ore Genesis of the Langdu Copper Deposit in Yunnan Province

作　　者：王春林[1,2] 孟明亮 项志磊 唐顺娟[2] 凡韬 王玉鹏[2] 鲁孝军 WANG Chun-lin1,2, MENG Ming-liang3 ,XIANG Zhi-lei2 ,TANG Shun-juan2 ,FAN Tao2 ,WANG Yu-peng2 ,LU Xiao-jun2(1. Chengdu University of Technology, Chengdu,Sichuan 610059 ; 2.403 Geological Team,Sichuan Bureau of Geology＆Mineral Resources,Emeishan,Sichuan 614200; 3. Yunnan Geology and Mineral Engineering Investigation Group,Kunming, Yunnan 65020)

机构地区：[1]成都理工大学,四川成都610059 [2]四川省地质矿产勘查开发局四0三地质队,四川峨眉山614200 [3]云南地矿工程勘察集团公司,云南昆明650200

出　　处：《地质与勘探》2018年第2期264-273,共10页Geology and Exploration

摘　　要：郎都铜矿位于义敦-中甸岛弧带南段,红山复式背斜北东翼。矿体主要赋存于张性破碎带、层间破碎带、褶皱的转折端以及外接触带。矿床的形成与围岩性质、构造破碎带和围岩蚀变类型有较为直接的联系。矿床类型属接触交代热液型铜矿床,与成矿有密切关系的岩体为石英二长斑岩,围岩为碳酸盐岩类中的灰岩类,典型的矽卡岩矿物为透辉石,其次为石榴子石,其中透辉石矽卡岩含矿性明显高于石榴子石矽卡岩。根据同位素研究成果,郎都铜矿的成矿年龄大致为214.8±3.8 Ma;成矿的大地构造环境属于造山带环境。成矿物质主要来源为下地壳,次为地幔,具备壳幔混合和深源-浅源混合的特征。矿床的形成是多期次交代作用叠加的结果,具典型的矽卡岩型铜矿床基本特征。The Langdu copper deposit is at the located northeast wing of Hongshan duplex anticline in the south section of the Yidun-Zhongdian island arc belt. Its ore bodies were deposited in tensile fracture zones, interlayer fracture zones, or at fold turning ends and outer contact belts. Formation of this copper deposit is related to the properties of surrounding rocks, structural fracture zones and the alteration types of host rocks, belonging to the contact metasomatic hydrothermal copper deposits. The rock mass closely related with mineralization is quartz diporphyry. The surrounding rock is limestone of carbonate rocks. The typical skarn minerals include diopside, followed by garnet, and the ore-bearing potential of diopside skarn is obviously higher than garnet skarn. According to the isotopic study, the mineralization age of the Langdu copper deposit is 214.8±3.8Ma, which formed in an orogenic environment. Mineralization material is most derived from the lower crust, secondly from the mantle, characterized by the mixing of the cruse and mantle and deep and shallow sources. Formation of this copper deposit is the result of the superposition of multi-stage metasomatism with basic features of skarn-type copper deposits.

关 键 词：郎都铜矿 矽卡岩矿床 地质特征 矿床成因 云南 

分 类 号：P618.41[天文地球—矿床学]