尕尔穷—嘎拉勒铜金矿集区S、Pb同位素地球化学特征  

S,Pb Isotope Geochemical Characteristics of the Gaerqiong-Galale Gold-Copper Ore-concentrated Area

作　　者：白云[1,2] 张志[1] 陈毓川[3] 唐菊兴[3] 何林 杨毅[1] 

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]四川省冶金地质勘查局六〇五大队,四川眉山620860 [3]中国地质科学院矿产资源研究所,北京100037 [4]西藏自治区地质矿产勘查开发局第二地质大队,西藏拉萨850000

出　　处：《金属矿山》2015年第9期100-104,共5页Metal Mine

基　　金：国土资源部公益性行业科研专项(编号:201011013-3);国家自然科学基金项目(编号:41172077);国家重点基础研究发展计划(973计划)项目(编号:2011CB403103)

摘　　要：以西藏尕尔穷—嘠拉勒铜金矿集区为研究对象,通过分析矿石硫化物S、Pb同位素组成特征,探讨了矿床物质来源,结果表明：1矿石金属硫化物δ34S值为-4.4‰~6.2‰,平均为0.13‰,主要集中于-2‰~1.5‰,具塔式分布特征,总体体现出地幔岩浆硫特点,但已受到少数地壳硫的混染;2矿石Pb同位素组成范围较大,体现出混源铅特征,其μ值特征及构造环境判别图显示区内铅起源于幔源,主要为地幔与上地壳混合的造山带铅;3与多龙矿集区多不杂与拿若矿床对比研究发现,两矿集区硫源均为岩浆硫,处于俯冲背景下的多龙矿集区成矿物质来源相对较深,而处于碰撞环境中的尕尔穷—嘎拉勒成矿物质来源相对较浅。上述分析成果对于区内找矿工作具有一定的参考价值。Taking the Gaerqiong-Glalae Cu-Au ore-concentrated area as the research object,the S and Pb isotope compo- sitions characteristics of sulfide ore and the metallogenic material sources are analyzed. The results show that：（1）the δ34S value of the ore metal sulfides vary from -4.4‰ to 6.2‰,with the average δ34S value of 0.13‰, mainly between -2 ‰ and 1.5 ‰, and with the characteristics of tower distribution,it overall reflects the characteristics of mantle magma sulfur, but has been contaminated by a few of crustal sulfur;（2）the composition range of Pb isotope of the ore is large, showing the characteristics of mixed source of lead, the characteristics of/x value and tectonic environment discrimination diagram indicate that lead of the re- search region is originated in the mantle source region, mainly the upper crust and mantle mixed orogenic belt lead;（3）compa- ring with the Buza and Naruo deposit in Duolong ore-concentrated area and the Gaerqiong-Glalae Cu-Au ore-concentrated area, it is considered that the source of sulfur of the above ore-concentrated areas are both magmatic sulfur,and the ore-forming ma- terials of Duolong ore-concentrated area is relatively deep with the environment of subduction, and the ore-forming materials of Gaerqiong-Galale ore-concentrated area is relatively shallow with the environment of collision. The above analysis results have a certain reference for the prospecting work in the research area.

关 键 词：S同位素 PB同位素 地球化学特征 壳幔混源 成矿物质来源 

分 类 号：P595[天文地球—地球化学]