地质与勘探2017，Vol.53Issue(2)：270-282,13.
新疆琼库都克Ag-Pb-Zn多金属矿区岩浆岩地球化学特征及锆石U-Pb年龄研究
Geochemical Characteristics and Zircon U-Pb Ages of the Magmatite inthe Qiongdukuke Ag-Pb-Zn Polymetallic Deposit of Xinjiang
摘要
Abstract
The Qiongdukuke Ag-Pb-Zn polymetallic deposit,located in the Xiaoshitouquan area 200 km away from northeast Hami,Xinjiang,is an epithermal Ag-Pb-Zn polymetallic deposit.Granite porphyries,monzonitic granites and biotite granites in the mining area are characterized by high silicon (average values of SiO2 are 73.45％,76.69％ and 76.97％),high alkaline(average values of K20 are 3.22％,2.49％ and 4.78％;average value of N a20 are 2.99 ％,5.20％ and 3.60％) and low aluminum (average value of A1203 are 13.29％,12.19％ and 11.97 ％) in terms of the major element,belonging to calc-alkaline series (average values of Rittmann Index are 1.27,1.76 and 2.08,σ ＜ 3.3).The results of the trace element and rare earth element tests suggest that they are enriched in large ion lithophile elements and light rare earth elements but depleted in high field strength elements and heavy rare earth elements,with relatively prominent negative Eu anomaly (average values of δEu are 0.57,2.07 and 0.15).The zircon U Pb dating by LA-ICP-MS yields ages of 320 ± 1.5 Ma in monzonitic granites,312 ± 1.7 Ma in granite-prophyry and 314 ±2.8 Ma in biotite granites.These ages indicate that these igneous rocks were emplaced in the Late Carboniferous epoch.Geochemical characteristics of the collected magmatic rocks in this deposit indicate that this deposit was formed in a magmatic arc environment.The whole formation process of the deposit was accompanied by orogeny of Harlik mountains,and we can roughly infer that the deposit was formed between the Early Carboniferous and Late Permian.关键词
琼库都克银多金属矿床/地球化学/锆石U-Pb/新疆Key words
Qiongdukuke Ag-Pb-Zn polymetallic deposit/geochemical characteristics/Zircon U-Pb/Xinjiang分类
天文与地球科学引用本文复制引用
张锐,毛启贵,于明杰,方同辉,程奋维..新疆琼库都克Ag-Pb-Zn多金属矿区岩浆岩地球化学特征及锆石U-Pb年龄研究[J].地质与勘探,2017,53(2):270-282,13.基金项目
国土资源部公益性行业科研专项经费项目(编号:201411026-1)和中国地质调查局基础性公益性地质调查项目(编号:DD20160071)联合资助. （编号:201411026-1）
