巖漿通道型銅鎳硫化物礦床典型實例

巖漿通道型銅鎳硫化物礦床

典型實例(1)Voisey’sBayDeposit,Labrador,Canada加拿大拉布拉多地區(qū)的Voisey’sBay礦床(2)KharaelakhDeposit,Noril’skRegion,Siberia西伯利亞Noril’sk

地區(qū)的Kharaelakh

礦床MushuauVoisey’sBayRegionalGeologyVoisey’sBay區(qū)域地質(zhì)圖1stExample:Voisey’sBayDepositGeologyoftheVoisey’sBayIntrusionVoisey’sBay巖體地質(zhì)圖3DViewoftheVoisey’sBayDepositVoisey’sBay礦床立體圖Lightfoot&Naldrett(1999)20mCrossSectionClosetotheExitoftheLowerChamber下巖漿房出口附近剖面圖DiscoveryHillFeederDykeCrossSection

巖漿通道(巖墻)剖面圖CrossSectionoftheOvoidOrebodyClosetotheUpperChamber

上巖漿房附近卵圓形礦體剖面圖塊狀硫化物片麻巖SNCrossSectionattheEntranceoftheFeedertotheUpperChamber上巖漿房通道入口剖面圖Initialmid-crustalcontaminationoftheVBmagmawassucceededbycontaminationbyTasiuyakgneiss,alongwithsomecontinuedcontaminationbylocalcountryrocks.TheMushuaintrusionshowslittlesignofTasiuyakcontamination.La/Smvs.Th/Nbdiagramillustratingthestagesofcontamination3cmwide微量元素地殼同化混染證據(jù)Lambertetal.(2000)Re-Os同位素地殼同化混染證據(jù)一個新的成礦模型Lightfootetal.20112ndExample:KharaelakhDepositAreaoftheSiberianLargeIgneousProvince西伯利亞大火成巖省的面積GeologicalMapoftheNoril’sk-TalnakhRegionNoril’sk-Talnakh

地區(qū)的區(qū)域地質(zhì)圖PlanViewandCrossSectionoftheKharaelakhIntrusionKharaelakh巖體的平面和剖面圖Evaporitexenolithswithinmassivesulfideorebody,SkalistyMine

在Skalisty礦山,塊狀礦體中含有蒸發(fā)巖捕虜體PhototakeninAugust2006Sulfideblebsinolivinegabbro

橄欖石輝長巖中珠滴狀硫化物Disseminatedsulfideingabbro

輝長巖中浸染狀硫化物PhototakeninAugust2006SiberianFloodBasalts西伯利亞溢流玄武巖Ni,Cu,PtandPdcontentsinSiberianfloodbasalts

西伯利亞溢流玄武巖中Ni,Cu,Pt和Pd的含量NadezhdinskylavashavehighLa/Sm,highSi02,loweNd(notshown),whichindicatecontaminationwithgranitoidcrust.Theyarealsodepletedinchalcophileelements,anindicationofsulfidesegregationLightfoot&Keays2005SulfurIsotopes硫同位素Ripleyetal.2003Grinenko1985Mineralizedintrusionshavehighd34Sindicatingassimilationofevaporite;floodbasaltshavemantle-likeSisotopecompositionsLAVASKharaelakhIntrusionTrendO-O’:contaminationwithevaporite-signatureoforeformationTrendW-W’:contaminationwithdetritalsediment-unrelatedtooreformationTrendM-C:contaminationwitholdgranitoidcrust,probablyinmid-crustalmagmachamber-unrelatedtooreformationArndtetal.2003Sr-NdIsotopes(Sr-Nd

同位素)

MagmaticAnhydrite

從巖漿結(jié)晶出來的硬石膏

d34Svaluesofmagmaticanhydrite-sulfideassemblagesintheKlaraelakhintrusion,SiberiaSampleSpotd34S(‰)d34S(‰)

AnhydriteChalcopyriteKH1122.410.4K58A118.79.7K58A218.99.5K58A318.310.3K58A421.710.1K58B521.29.5K58B619.712.0Averagen=720.110.2Sisotopesofanhydrite-chalcopyrite

硬石膏和黃銅礦的硫同位素RcalculatedfromSisotopecomposition巖漿中Pt的初始含量(ppb)Sulfidecomposition硫化物成分MassBalance質(zhì)量平衡ANewGeneticModel一個新的成礦模型ExplorationofmagmaticNi-Cudepositsinmagmaconduitsystem

巖漿通道系統(tǒng)銅鎳礦床勘探指南

(1) Olivine-bearingmafic-ultramaficintrusions,largeorsmall

含橄欖石的基性或超基性巖體:無論大小(2) S-bearingcountryrockssurroundingtheintr