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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瑞典北部比約克達(dá)爾金礦床地質(zhì)特征及成因曹毅,聶風(fēng)軍,丁成武,蔣掂。,李強(qiáng)鋒,王豐翔。,張偉波CAOYi,NIEFengjun,DINGChengwu,JIANGZhe。,LIQiangfeng3,WANGFengxiang。,ZHANGWeibo1.中國地質(zhì)科學(xué)院礦產(chǎn)資源研究所/國土資源部成礦作用與資源評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室.北京100037:2.五礦勘查開發(fā)有限公司,北京100010;3.石家莊經(jīng)濟(jì)學(xué)院研究生學(xué)院,河北石家莊.050031:4.中
2、國地質(zhì)調(diào)查局發(fā)展研究中心,北京,1000371.InstituteofMineralResources,CAGS,Beng100037,China;2.MinmetalsExplorationandDevelopmentCo.,LTD,Bering100010,China;3.ShifiazhuangUniversityofEconomics,Sh~azhuang050031,Hebei,China;4.DevelopmentResearchCente5ChinaGeologicalSurvey,Beng100037,China摘要:比約克達(dá)爾(Bjok&1)金礦
3、位于瑞典北部古元古代斯科勒費(fèi)特(Skene~e)地塊的東部。成礦母巖為花崗巖類侵入體。該金礦的石英、白鎢礦、方解石中的包體有3類。石英的6o值為8.3%?!?4.3‰,2個(gè)全巖樣品的8o值分別為9‰和10.4‰。Sm-Nd同位素?cái)?shù)據(jù)得出礦石中白鎢礦等時(shí)線年齡為1915_+32Ma(IvISWD=0.25),白鎢礦的e㈨(1.88Ga)的值為+1.1-+1.7。通過對(duì)礦化石英脈中流體包裹體的研究,將礦化分為3個(gè)主要階段。第一階段發(fā)育的石英脈伴隨少量的白鎢礦和硫化物,礦化作用的主要階段發(fā)生了巖漿流體和地表水的混合,混合的同時(shí)伴隨壓力下降和pH值增加,第三階段發(fā)生在13
4、0~220X3,這時(shí)產(chǎn)生了金一方解石一碲化物礦化,并對(duì)原生礦石進(jìn)行了部分改造。關(guān)鍵詞:比約克達(dá)爾;瑞典;金礦床;地質(zhì)特征;礦床成因中圖分類號(hào):P611;P618.51文獻(xiàn)標(biāo)志碼:A文章編號(hào):1671—2552(2015)06-1172-10CaoY,NieFJ,DingCW,JiangZ,LiQF,WangFX,ZhangWB.GeologicalfeaturesandgenesisoftheBjorkdalgoldde·positinnorthernSweden.GeologicalBulletinofChina,2015,34(6):1172—1181Abst
5、ract:TheBjorkdalgolddepositislocatedintheeasternpartoftheEarlyProterozoicSkele~edistrictinnorthernSweden.Theorezoneishostedbyagranitoidintrusion.Threetypesoffluidsarerepresentedbyfluidinclusionsobservedinqua~z,scheeliteandcalcite.8Ovaluesofqua~zsamplesrangebetween+8.3%0and+14.3%0.Thet
6、WOwhole—rocksamplesyieldedoxygenisotopevaluesof+9.0%0and10.4%o.Sm—NdisotopedatawerecoUected.a(chǎn)ndtheobtainedisochronageisratherwelconstrainedat1915±32Ma(MSWD=0.25).Theresulting。(f=1.88Ga)valuesarebetween+1.1and+1.7.Threemainstagesofmineralizationarein—ferredfrominvestigationoffluidinclu
7、sionsinmineralizedquartzveins.Thefirststagethatproducedquartz—veinswithminorschee—liteandsulfidesweremainlybadenwithrespecttogold;themainstageofmineralizationisconsideredtohaveoccurredthroughmix—ingofthemagmaticfluidwithSUrface—derivedfluidssuchasseawater,andthismixingwascontemporaneo
8、uswit