甘肃省金川超大型铜镍硫化物矿床富铂钯矿石成因研究.pdf

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1、矿物岩石地球化学通报·研究成果·BulletinofMineralogy，PetrologyandGeochemistryVo1．31No．4，July2012甘肃省金川超大型铜镍硫化物矿床富铂钯矿石成因研究王泸文，汤中立lI兰州大学地质科学与矿产资源学院，兰州730000；2．长安大学地球科学与资源学院，西安710054摘要：金川铜镍硫化物矿床的成因及侵位机制尤其是块状矿石和铂钯富集体成因一直存在较大争议，本文通过对金川矿石的空间关系、地球化学特征研究，指出金川矿床遭受构造f及热液蚀变作用影响明显，块状矿石相对富集Os、Ir、Ru、Rh，铂钯富集体相对富集Pt、

2、Pd、Au、Cu。研究认为，块状矿石是晚期纯硫化物矿浆上升贯入后经单硫化物固溶体结晶堆积而成，残余熔浆形成初始铂族矿物，后期矿体遭受热液蚀变及构造剪切一热液作用，使Pt、Pd、Cu、Au进一步富集形成铂钯富集体，并在有利于成矿的空间聚集成矿。块状矿石与铂钯富集体关系密切，据此推测2矿体、24矿体深边部裂隙中具有良好的勘探前景。关键词：金川；硫化物矿床；块状矿石；铂钯富集体；矿石成因中图分类号：P619．2O1．42文献标识码：A文章编号：1007—2802(2012)04—0388—08Pt-PdRichOresGenesisResearchofJinchuanG

3、iantNi-CuSulfideDeposit，inGansuProvinceWANGLu—wen，TANGZhong—li’1．SchoolofEarthScience，LanzhouUniversity，Lanzhou730000，China；2．CollegeofEarthScienceandResourceManagement，Chang’anUniversity，Xi’an710054，ChinaAbstract：TheJinchuandepositunderstandingsofthesulfideoregenesisandthemagmaintrus

4、ionandemplacementhistoryofitremainslimited．Onthebasisofthespatialrelationshipsandthegeochemistryofmagmaticsulfideores，thispapersuggeststhattheJinchuandepositwasaffectedobviouslybytectonizationandhydrothermalaltera—tions，andthatthemassiveoresarerelativelyenrichedinOs，Ir，Ru，Rhcomparingw

5、ithotherore—formingele—ments，whereasPt—Pd-richsulfideoresarerelativelyrichofPt，Pd，Au，Cu．Itisconcludedthatplatinumgroupminerals(PGMs)aretherelicliquidofmonosulfidesolidsolutionsegregation，andthatthemassiveorerepresentstheaccumulationofmonosulfidesolidsolution，andthatthelatestageofpures

6、ulfideliquidinjectionevolvesbothmassiveoreandPGM．Theorebodiesunderwenthydrothermalandtectonic-hydrothermalalterations，thusPt，Pd，Cu，AuareconcentratedinPt-Pd-richsulfideoreswhichhdvedepositedinthecertainrestrictedlocalities．ItisconcludedthattheJinchuandepositwasformedasaresultofprimarym

7、agmaticcrystallizationfollowedbyhydro—thermalremobilization，transport，anddepositionofPGE．BasedonspecialrelationshipsofmassiveoresandPt—Pd-richzones，weexpectthattheprospectofseekingneworebodiesindeepandborderfracturesinthefootwallsoforebody一2andorebody-24appearstobejustified．Keywords：J

8、inchu