与溢流性玄武岩有关的铜镍硫化物矿床地质地球学特征与成矿潜力分析——以广西罗城县清明山铜镍硫化物矿床为例  

Analysis of Geologic and Gechemical Characteristic and Potential of Cu-Ni Sulfide Deposits Associated with Overflow Basalt:A Case Study of the Qingmingshan Cu-Ni Sulfide Deposit,Guangxi Province

作　　者：刘继顺[1] 杨振军[1,2] 伊利军[1] 豆松[1] 康亚龙[1] 杨立功[1] 

机构地区：[1]中南大学地学与环境工程学院,长沙410083 [2]广西罗城矿业有限责任公司,罗城546400

出　　处：《地质与勘探》2010年第4期687-697,共11页Geology and Exploration

基　　金：国家自然科学基金项目(40072032)资助

摘　　要：广西罗城县清明山铜镍硫化物矿床,镁铁质-超镁铁侵入岩与玄武岩广泛分布,时空关系密切,两者岩石化学成分丰度相同,均具有富MgO、贫SiO2、TiO2、K2O的特征,微量元素、稀土特征相同,具有成因上的联系和有先后演化的特征。含矿镁铁质岩体岩石化学成分SiO2含量为42.68～50.63%,K2O含量0.052～2.54%,TiO2含量0.326～0.63%;微量元素Rb,Ba富集,Ta、Nb亏损的特征,稀土元素含量中等ΣREE=27.56～52.36(10-6),ΣLREE/ΣHREE=7.17～12.31,(La/Yb)N=2.48～8.17,δEu=0.93～1.43,轻稀土富集,配分曲线右倾,无δEu负异常;硫同位素δ34S值4.52～17.04‰。镁铁质-超镁铁岩和铜镍硫化矿主要物质来源于幔源,有壳源混染;地质特征、地球化学特征等与美国Duluth铜镍硫化物矿床特征相同,为国内一种新的与溢流玄岩有关的岩浆铜镍硫化物矿床,资源潜力巨大。In the Qingmingshan Cu-Ni sulfide deposit of Luocheng county, Guangxi Provinc, mafic-ultramafic volcanic and intrusive rocks are widely distributed, closely related to each other in space and time, both of which are rich in MgO, and poor in SiO2 , TiO2 , K2 O. They have same characteristics of abundance of the chemical composition and trace elements rare earth, with the relation in causes and the characteristics of sequenetial evolution. The ore -bearing mafic-ultramafic rock contains SiO2：42.68% -50.63% , A1203 6.62% - 17.54% , MgO：6.88% -25.12% , K2O：0. 052% - 2.54% , TiO2：0. 326 - 0.63 % , respectively, with trace elements enrich in Rb and Ba, and lossing in Ta and Nb. Rare earth elements have medium- grade abundance of ∑REE, ∑REE varying from 27.56（10-6） to 52.36（10-6） ,∑LREE / ∑HREE from7.17 to 12.31 ,（La/ Yb）N from2.48 to8.17,SEu from 0.93 to 1.43 ,enrichment in abundances of LREE, right-leaning on distribution patterns,no δEu negative anomalies, δ^34S value from 4.52‰ to 17.04 ‰. Mafic-uhramafic rocks and nickel-copper sulfide ore mostly originate from the mantle material and mixed by crust, have some geological and geochemical characteristics comparable with Duluth copper-nickel sulfide deposits in the United States. Thus it should be one new domestic Cu-Ni sulfide deposit related closely with overflow basalt in cause, representing a giant potential of resources.

关 键 词：铜镍硫化物矿床 镁铁质-超镁铁岩 玄武岩 清明山 

分 类 号：P618.51[天文地球—矿床学]