东天山白鑫滩铜镍硫化物矿床铂族元素地球化学特征及意义  

Platinum-group Elements Geochemistry and Its Significances of Baixintan Cu-Ni Sulfide Deposit in Eastern Tianshan,NW China

作　　者：李平 赵同阳 米宝昕 韩琼 Li Ping;Zhao Tongyang;Mi Baoxin;Han Qiong(Xinjiang Institute of Geological Survey,Urumqi,Xinjiang,830000,China;Geological Society of Xinjiang,Urumqi,Xinjiang,830000,China)

机构地区：[1]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000 [2]新疆维吾尔自治区地质学会,新疆乌鲁木齐830000

出　　处：《新疆地质》2019年第4期464-468,共5页Xinjiang Geology

基　　金：国家重点研发计划项目(2018YFC0604001-04);新疆区域地质调查片区总结与服务产品开发(DD20160345-04)联合资助

摘　　要：白鑫滩铜镍硫化物矿床位于东天山镁铁-超镁铁质岩带西段,受大草滩深大断裂控制,岩体由辉长岩、橄榄辉石岩、辉石橄榄岩组成。白鑫滩岩体的铂族元素(PGE)含量相对较低,其中IPGE(Os、Ir、Ru)与PPGE(Ru、Pt、Pd)含量相近,PPGE略高于IPGE。岩石ΣPGE含量3.82×10^-9~5.36×10^-9,平均4.53×10^-9。岩石具相似的原始地幔标准化分布型式,PPGE和IPGE之间分异很弱。通过铂族元素源区示踪分析认为,形成白鑫滩岩体的母岩浆为MgO含量较高的PGE不亏损的拉斑玄武质岩浆,上升过程中遭地壳物质混染及橄榄石等矿物的分离结晶作用,引起该矿床硫饱和并发生硫化物熔离作用而成矿,深部岩浆通道仍具较好的找矿空间。The Baixintan copper-nickel sulphide deposit is located in the western segment of the East Tianshan maficultramafic zone.It is controlled by the deep and large faults of the Dacaotan,and composed of gabbro,olivine pyroxenite and pyroxene peridotite.The content of platinum group elements(PGE)in mafic rocks of the Baixintan copper-nickel sulfide deposit is very low.The IPGE(Os,Ir,Ru)and PPGE(Ru,Pt,Pd)content are similar,and the PPGE is slightly higher than IPGE.The ΣPGE content is 3.82×10^-9 to 5.36×10^-9,with average value of 4.53×10^-9.In the original mantle standardization diagram,the rocks have a similar distribution pattern,and the difference between PPGE and IPGE is very weak.The characteristics of the platinum group elements show that the original magma forming the Baixintan rocks is high MgO content with PGE non-depleted basaltic magma.In the process of ascending,it is affected by the mixing of crustal materials and the separation and crystallization of minerals such as olivine,causing the sulfur saturation of the deposit and the occurrence of sulfide leaching to form ore.The deep magma channel still has a good prospecting space.

关 键 词：东天山 白鑫滩 铂族元素 地球化学 铜镍硫化物矿床 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学]