第14卷第9期2023年9月Vol.14No.9September,2023矿产勘查MINERALEXPLORATION津巴布韦大岩墙铂族矿床分布特征及成因分析李斯,李冬月,鲁佳,何旭,蔡厚安,张普斌(有色金属矿产地质调查中心,北京100012)摘要津巴布韦大岩墙是一套铁镁质和超铁镁质的层状基性-超基性岩体,是铂族元素主要成矿地带。本文通过对大岩墙中铂族矿床的分布规律进行研究得出,本区铂族矿床主要产于岩体中硫化物带(MSZ)的底部,矿体呈层状、似层状赋存于辉石岩中,其埋深具有在大岩墙的两翼浅、核部深的特征。电子探针分析表明,铂族元素主要产于以磁黄铁矿、镍黄铁矿、黄铁矿为主的硫化矿物组合中,镍和钴的含量均较低。成因分析表明,矿床中铂族元素的富集与基性-超基性的岩浆分异作用关系密切,原始岩浆来源于地幔,成矿环境为低氧逸度和高硫逸度的还原环境,并具有多期成岩成矿特征。关键词基性-超基性岩;铂族矿床;硫化物带;大岩墙;津巴布韦中图分类号:P612文献标志码:A文章编号:1674-7801(2023)09-1661-08Analysisofthedistributioncharacteristicsandgenesisofplatinum-groupelementdepositsintheGreatDykeofZimbabweLISi,LIDongyue,LUJia,HEXu,CAIHouan,ZHANGPubin(ChinaNon-ferrousMetalsResourceGeologicalSurvey,Beijing100012,China)Abstract:TheGreatDykeofZimbabweisastratiformmafic-ultramaficlayeredintrusioncomprisinggabbroicandultramaficcumulates,servingasamajorhostforplatinum-groupelementmineralization.Throughsummariza⁃tionofthedistributionpatternsofplatinum-groupelementdepositsintheGreatDyke,itisconcludedthattheplatinum-groupelementdepositsinthisareaarepredominantlylocatedatthebaseofthesulfidezones(MSZ)withintheintrusion.Theorebodiesoccurasstratiformtosemi-stratiformlayershostedinpyroxenites,anddisplayaburialdepthpatternofbeingshallowatthelimbsanddeepinthecentralpartoftheGreatDyke.Theelectronmicroprobeanalysisindicatesthattheplatinum-groupelementsarepredominantlyhostedinsulfidemineralassemblagesdominatedbypyrrhotite,pentlanditeandchalcopyrite,withlowcontentsofnickelandcobalt.Geneticanalysisindicatesthattheenrichmentofplatinumgroupelementsintheoredepositiscloselyrelatedtothemagmaticdifferentiationofbasic-ultrabasicmagmas.Theparentalmagmasar...