金川铜镍矿床龙首矿区半金属元素与铂族元素地球化学特征及成因意义  

Geochemistry and Petrogenetic Significances of Semimetal and Platinum Group Elements of the Longshou Mine of the Jinchuan Ni-Cu Sulfide Deposit

作　　者：江金进 宋谢炎[2] 陈列锰[2] 王亮[1] 符志强[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550002 [3]贵州省国土资源勘测规划研究院,贵阳550004

出　　处：《矿物岩石地球化学通报》2014年第6期882-892,共11页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：矿床地球化学国家重点实验室开放基金项目(SKLODG-ZY125-06);国家自然科学基金项目(40973038,41003022,41172090)

摘　　要：岩浆硫化物矿床中的铂族元素矿物主要是与半金属元素的化合物,但有关这些半金属元素在岩浆系统中的行为的研究却甚少。对金川龙首矿区不同类型矿石的Cu、Ni、铂族元素和半金属元素的分析研究发现,在熔离过程中这些半金属元素会与铂族元素一起进入硫化物熔浆中,在硫化物熔浆分离结晶过程中倾向于在残余熔体中富集,在单硫化物固溶体分离过程中部分半金属元素趋于进入镍黄铁矿中。由于半金属元素与铂族元素(PGE),特别是Pt和Pd,具有很强的亲和力,所以在半金属元素达到铂族矿物结晶所需要的饱和浓度前,其存在会阻碍PGE进入金属硫化物(BMS)中。此外,金川矿床S/Se值的变化不仅受同化混染作用及硫化物熔离强度的影响,还受后期热液蚀变作用的影响。Semimetal elements are important elements in the formation of platinum group element minerals （PGM） in sulfide deposits,but behaviors of these elements in magmatic systems are not well known.The contents of Cu,Ni,platinum group elements （PGE） and semimetal elements of different types of sulfide ores in the Longshou mine of the Jinchuan deposit had been measured.We found that the semimetal elements were concentrated in the sulfide melt along with PGE during melting process,which is consistent with prior studies.In the subsequent crystallization of monosulfide solid solution from the sulfide melt,the semimetal elements remained in the residual sulfide liquid since their incompatibility.However,some semimetal elements partitioned into pentlandite during MSS fractionation.Semimetal elements show chemical affinities with PGE,particularly Pt and Pd,therefore,the semimetal elements kept PGE in the residual sulfide melt until the semimetal elements became saturation to crystallize PGM.In addition to above findings,this study found that the variations of S/Se in the Longshou mine of the Jinchuan deposit were influenced by strength of sulfide segregation,crustal contamination and hydrothermal alteration.

关 键 词：金川 铜镍硫化物矿床 半金属元素 铂族元素 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学] P618.53