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1、第34卷第6期地質(zhì)通報(bào)Vo1.34,No.62015年6月GEOLOGICALBULLETINOFCHINAJun.,2015芬蘭北部克維特斯塔鎳一銅一鉑族元素礦床地質(zhì)特征及礦床成因張曉康L。,聶鳳軍,徐九華,吳科銳ZHANGXiaokang,NIEFengjun,XUJiuhua,WUKerui,1.北京科技大學(xué)土木與環(huán)境工程學(xué)院,北京100083;2.中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所國(guó)土資源部成礦作用與資源評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室,北京1000371.CivilandEnvironmentalEngineeringSchool,Universit
2、yofScienceandTechnologyBeijing,Beijing100083,China;2·MRLKeyLaboratoryofMetallogenyandMineralAssessment,InstituteofMineralResources,CAGS,Beijing100037,China摘要:位于芬蘭北部中拉普蘭綠巖帶的克維特斯塔(Kevitsa)鎳一銅一鉑族元素礦床是世界上主要的巖漿鎳一銅硫化物礦床之一。該礦床儲(chǔ)量大,含豐富的鎳一銅硫化物和鉑族元素。對(duì)礦床產(chǎn)出環(huán)境、地質(zhì)特征、礦床成因等進(jìn)行了總結(jié),結(jié)果表明:礦體主
3、要賦存于克維特斯塔基性一超基性層狀侵入體的超基性單元中。主要礦石類型為普通型和鎳一鉑族元素型2種,其中鎳一鉑族元素型礦石內(nèi)橄欖石具極高的Ni含量。主要礦石礦物為磁黃鐵礦、鎳黃鐵礦、黃銅礦、黃鐵礦、針硫鎳礦、紅砷鎳礦、砷鎳礦、輝砷鎳礦等,絕大部分鉑族礦物包含在硅酸鹽中和附著在硫化物顆粒邊界。Re—Os、Sm—Nd、Sr及s同位素特征顯示成礦巖漿為幔源,但受到地殼物質(zhì)的混染作用。Pb同位素年代學(xué)結(jié)果表明克維特斯塔侵入體形成于古元古代。關(guān)鍵詞:鎳一銅一鉑族元素礦床;層狀侵入體;中拉普蘭綠巖帶;橄欖石;芬蘭中圖分類號(hào):P618.2文獻(xiàn)標(biāo)志碼:A
4、文章編號(hào):1671—2552(2015)06—1146—14ZhangXK,NieFJ,XuJH,WuKR.GeologicalcharacteristicsandgenesisoftheKevitsaNi—Cu—PGEdeposit,northernFinland.GeologicalBulletinofChina,2015,34(6):1146一l159Abstract:LocatedintheCentralLaplandgreenstonebeltofnorthernFinland,theKevitsaNi—Cu—PGEdepos
5、itisoneofthemajormagrnaticNi—Cusulfidedepositsintheworld.ThedeposithasabundantreservesandisrichinNi—CusulfideandPGE.Thispapersummarizestheenvironment,geologicalcharacteristics,oregenesisandotheraspectsoftheoredeposit.TheorebodiesaremainlyhostedinultramaficunitintheKevits
6、amafic—ultramaficlayeredintrusions;themainoretypesaredividedintotWOtypes,i.e.,com-montypeandNi——PGEtype;theohvinesinNi——PGEtypehaveextremelyhighNicontent;themainoremineralsincludepyrrho。。rite,pentlandite,chalcopyrite,pyrite,millerite,niccolite,chloanthiteandgersdorfite,w
7、ithmostoftheplatinumgroupmineralsCOD--tainedinthesihcateorattachedtotheboundaryofsulfideparticles;Re—Os,Sm—Nd,SrandSisotopiccharacteristicsindicatethatmineralizedmagmawasderivedfromthemande,butthemagmawascontaminatedbycrustalsubstances;geochronologicanalysisin—dicatestha
8、tKevitsaintrusionWaSformedinthePaleoproterozoic.Keywords:Ni——Cu—PGEdeposit;layeredintrusions;centrMLapl