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Geochemistry and metallogenic age of Sishanlinchang gold-silver deposit in Jidong of Heilongjiang

By Alan Cook,2014-11-19 07:20
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Geochemistry and metallogenic age of Sishanlinchang gold-silver deposit in Jidong of Heilongjiang

    Geochemistry and metallogenic age of

    Sishanlinchang gold-silver deposit in

    Jidong of Heilongjiang

    GlobalGeology,14(1):29-43(2011)

    1

    doi:10.3969/j.issn.16739736.2011.01.05

    ArticleID:1673-9736(2011)01002915

    GeochemistryandmetallogenicageofSishanlinchang

    gold-silverdepositinJidongofHeilongjiang

    HUANGYongwei.LIUJiajunandGA0Chen

    TheFirstInstituteofGeologyExplorationofHeilongiiangProvince,Muda~ing157011,Heilongfiang,China;

    SchooloftheEarthSciencesandResources,ChinaUniversityGeosciences,Beijing100083,China

    Abstract:theSishanlinchanggoldsilverdepositismainlycomposedofgold

    qua~zveintypeores.Ithasmany

    kinds0fsulfidesandgoldinhighgrade.TheAuhasaclosecorrelationwithAs,Pb,AgandCu.Geochemi

    ca11v.thedepositischaracterizedbyrelativelyenrichmentinLREEwithmoderateorlowerEunegativeanoma

    ly.Sulfurisotopesappearassingleanddeepsource,andleadisotopesindicatethePbisfromtheearth'smantle

    andcnlst.whichmainlyareorogenicbeltPb,the0re

    ~rmingfluidhasatemperatureof215(?一350~Canda

    lowsalinitvwithamixtureofcharacteristicsofmagmaitchydrothermalandmeteoricwater.Theoreformingage

is111.1

    111.4Ma.Thedepositisformedinmineralizationandprecipitationofmetallogenicmaterials

    caused

    bythemixtureofthemagmatichydrothermalfluidandmeteoricwater.

    Keywords:epitherrnalgolddeposits;geochemistry;metallogeniematerials;Jidong;Heilon

    ~iang

    Regionalgeologicfeature

    ThedepositislocatedinXingkaiLakeBureya

    block,atTaipingMountainupwarpingregion,the northernendofpolymetallicorezone,northwestand thenorthpartofTanLudownfauhed.NearSNstrue

    turesexistinthestudiedarea;NEEstructurescut YanwangdianFormationinUpperProterozoic,anti

    clinestructuresconsistingofschistcontrolmagmatic activitiesandmetallogeneticreact.TheschistinUp

    perProterozoicinthestudiedarea,Jurassicgrano

    diorite,theabundanceofgoldishigher,particularly theschiststratacontainC,ispropitioustoenrichgold element.Magmaticactivitiesinvadedfrequentlyin UpperTriassic-JurassicCretaceous,whichtookad

    vantageofactivation,movementandenrichmentto formpolymetallicelement.

    Received2December2010,accepted10JanumT2011 2Geologyoforedeposits

    2.1s?trata

    Theoutcroppedrocksinthestudiedareamainly consistofquartzschist(beingmaingoldpolymetallic

    sourcebed)fromYanwangdianFormationofHuang

    songGroupinUpperProterozoic(Pt32yn),intermedi

ateacidvolcanicrockscatteredinLuoquanzhanFor

    mation(T31)ofUpperTriassic;thereexistsPaleo

    geneChuandishanFormationbasalt(6N2)andso on.

    2.2Magmaticactivities

    SinceMesozoicinthisarea,asaresultoflitho

    sDherevertiealmovementandformationoffracture structure,magmaticactivitiesarerelativelyfrequent; therearethreeinvasions,twoeruptions:LateTriassic magmatieintrusioneruption;LateJurassicintrusive phase;Cretaceousintrusivephase;Neogeneeruption. 30HuangY.W..buJ.J.andGaoC

    2.3Structures

    TheworkplacelocatesonaNWlimbofanticli

    noriunl,theredevelopedfracturestructures.TheNW limbofanticline.axislocatedinthesoutharea,tend towardsisNEENE.inclinedtoNW,theaxisstrata

    arecomposedofgneissinthelowerofYanwangdian, thereareAu,CuandMointhedeposits,andcorn

    posedofschiststratainthemiddle?-upperofYanwang-- dian,thereareAu,AgandCuinthedeposits. 2.4Thebodysizeandcharacteristics

    Thefracturestructuresaredevelopedinthestud

    iedarea,whichbelongtoNEEtectonicbelt,approxi

    matelyparalleltotheaxisofanticline.Therearefour stripesmarkinevidence,spacedparallelasthedis

    tanceof1000nlorso.Itcontrolsdikesandsmall intrusiverocksinUpperMesozoic,includingAu,Ag, CuandMoorebodies.

    Therearesixgold-silverbodiesinthestudiedar--

ea.theirnumbersareIVI,ofwhichbodyIand

    bodyIIarebigger;Thetwoorebodiesoccurinbear

    ingcarbonplakitefrominthemiddleperiodofYah

    wangdianFormationofHuangsongqunGroupinUpper Proterozoie,andcontactbeltbetweenNEENEfrae

    turestructurebeltandCretaceousdioriticporphyrite dike.

    BodyI,is775nlinlengthand65400min

    depth,tendtowardsisNE50.?80.,inclinedtoNW,

    obliquityis40.63..thethicknessofbodyis0.8

    7.O0m.average1.97in,thetenorofgoldis2.52x 10一一40.O0×10.averageis5.22×10.,

    the

    tenorofsilveris1.44x10一一366x10....average

    is64.05×10_?.

    BodyII,lengthis400m,depthis20150m,

    ThestrikingisNE50.80..inclinedtoNW.obliq

    uityis45.65..BodyIIislocatedonthehanging wallofBodyI.themiddleofstrueturalbelt,the spacebetween40'130m,thethicknessofbodyis 0.882.8m,averageis1.19m,thetenorofgoldis 2.61×10一一12.5.10.averageis4.35×10.,

    theten0rofsilveris4.45x10?一440.00x10?.

    2.5Orecharacter

    (1)Theconstituteofore

    Theoreismainlycomposedofarsenopyriteand pyrite.Inadditiontherearecommonehaleopyfite, galenaandsphalerite,andalittlebornite,nickeline, tetrahedrite,tennantite,limonite,marcasite,covel

lite,ehalcosine,electrum,goldarge~tid,gold,aylva

    niteandsoon.Nonmetallicmineralsaremainly

    quartzfeldspar,carbonateminerals,micaandclay materialofcarbon.

    Oretextureandstructure

    textureincludesgranulartexture,intersertal dissolutionedgetexture,islandtexture, junctionedge,aswellasporphyroclasts,fractured texture.replacementremnanttexture,atolltexture. Orestructurereferstomassivestructure,dissem

    inatedstructure,bandedstructure,stoekwerkestrue

    ture,breeeiformstructure,etc.

    (3)Oretype

    Accordingtotexture,structure,occurrenceand mineralassemblage,orecanbedividedintofour types:brecciatedtypeore,metagranitetypeore, polymetallicsulfidesquartzveintypeore,arsenopyrite pyritequartzveintypeore.Polymetallicsulfides quartzveintypeorehasthehighesttenorofgoldand silver,thehighestmayattainhundredsg/t.Thegold contentinarsenopyritepyritequartzveintypeoreonly lessthanpolymetallicquartzveintypeore,usualis 5.0x10一一20.0x10?.thegoldcontentinbrecci

    atedtypeoreislowerthanthefirsttwo,typically1.0 ×10一一6.0×10:metagranitetypeorehasthe

    lowestgoldcontent.is0.5x10?一2.0×106.

    (4)Theoeeurreneeofgold

    Oreismainlyconstitutedbygoldbearingquartz

    veinsandstructuralalteredrock,goldandsilvermin

    eralsmainlyoccurinquartzgrainandgangue,seldom

inpolymetallicsulfides.Thegoldinthisdepositmost

    lyappearasinclusiongold,fissuregoldandinterg

    ranulargold.

    (5)Stagesofmineralization

    Ore~rmingprocessplotoutthreeperiodsac

    cordingtogeologiccharacteristicsandoreoccurrence, thefirststageissourcebedforming;thesecondisin

    terstratifiedfaultage,dioriticporphyriteinvadedalong ?

    

    Geochemist

    

    ryandmetall.genicge.fSishanlinchanggoldsilverde[IositinJid."g()fHenia" g

    theCOntactbeltformingaheredrocktt1eI1forruinga seeondmyenrichment;laterduetoaetivitiesofsili

    eeoushydrothermalenriched0re.Thethirdperiodis mainepochofmineralization,accordingtotheform orderoforeandconfigurationcharacterdivideinto fourperiods,thebuildorderofeveryperiodInetall0. genicandconfigurationcharacter('Fable1). Table1Sequenceofmajormineralsinmineralizationstages Metal[ogenicperiod

    3Geochemistry

    3?1Majormetallogenicelementgeochemistry Table2showsthatcontentofvari0usrocksand mineralsarefollowingrules,whichgraduallyincrease forschist,

    dike,breccia,metagraniteandcuartz

    vein,Au,Ag,As,Sb,Hg,Cu,Pb,ete.Themi.

    eroelementrelativeanalysisaboutgoldandsilver quartzvein,theresultscanbeseeninTable3. FromTable3,itshowsthattherearefoure1e

    mentsforthehighcorrelationwithAu,I1ame1v.As. Pl,AgandCu,

    thesulfidecontentishighinthistvDe

    ore,butthecorrelationwithAuandSisnotgo0d. far

    belowthecorrelationwithAsandAu.

    Intheore,pv

    riteisthehighestsulfideincontentexceptarsenopy- rite,itshowsthatthecorrelationbetweeI1enrichment 32HuangY.W..LiuJ.J.andGaoC

    ofgoldandpyriteisnotgood,thereresultsindicate thatthemainmetallogenicepochinthisdepositis closelvrelatewithenrichmentofarsenopyrite.The oreformingfluidshouldbeenrichedAs,Au,Ag, Pb.CuandSb.

    3.2Microelementgeochemistry

    Microelementsingoldbearingqua~zveinarefar

    

    

    

    

    Schist

    RbBaThUKTaNb1aCeSIN(IPZtHfSmTiYYbLu

    Dike

     behindintheotherfourrocksexceptRbandU(Ta

    ble4),thereforeinthespidergramoftraceelements

relativetotheoriginalmantle(Fig.1),themieroele

    mentinpolymetallicqua~zveinrelativetothestand

    ardizationcurveoftracedelementsrelativetotheorig

    inalmantle.c0llectivityunderthecurveofschist,

    metagranite,dikeandbrecciatedrock. c

    

    ?

    

    E

    =

    e=

    d

    Metagranite

    RbBaThUKTaNbLaCeSrNdPZrHfSm"15YYbLu Gold-silverquartzvein

    RbBaThUKTaNbL0CeSrNdPZrHfSmTiYYbLu Breccia

    RbBaUKTaNbLacesrNdPZrItfsmTiYYbLu A"rocks

    Fig.1Spidergram.fprimitivemantle-normalizedtracee|ementspiderdiagraminSishanlinc

    hangg0ld-sil.dp0sit

    0一??吕01I)100

    01??E三旨lJd/0

    0日日0AI1lg粤蛊

    ?g三吕d,)100

    GeochemistryandmetallogenicageofSishanlinchanggoldsilverdepositinJidongofHeilon~iang33 lithologygohtandsilverqua~zveinschistmetagranite

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