长坑金矿床地质特征与成因探讨

61Vol16No111997JOURNALOFPRECIOUSMETALLICGEOLOGY1997(),,,,,,,,,.90.,.,..,,,.,[1,2],;[3],.,,,,.1-,.NE-.,.,,262815km,E-WNEE.,E-W,210-6mös2,,.20km..,.:,,,93.:1996-09-23.:1996-11-04..©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.;,,.,,.---,-,-...,.,.-(?).NE-SW,NNE,NNE,SE,NW,,SW.,3060o.,.SE,,SE.NE,SW,.,.(-)10km,NE,4050o,.,,.,70km,E-W,S,50o,.,.,,.,.,,.,,,,,,[4].,20m,,..,.2,(1).,(2).211[5].(C1zm):a,-,;b,,.,.821997©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1Fig11GeologicmapofChangkenggolddepositQ(Quaternary);E(Tertiary);T3xp(Xiaopingfm1,upperTriassic);C1zbb(MemberbofZimenqiaofm.,lowerCarboniferous);C1zaa(MemberaofZimenqiaofm1,lowerCarboniferous);C1c(Ceshuifm.,lowerCarboniferous);C1sh(Shidengzifm.,lowerCarboniferous);1(goldorebody);2(fault);3()(geologicalboundary);4(unconformityboundary);5(exproratoryline);6(pool)-,..,,,,,(10%40%),,01038mm.,,.,,,.212.21211,[3].NE5060o,4SW,,12(1).SE,.4060o,.,,50m.10.,NW,,,.921:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.24Fig12Sectionalongexporatoryline4ofChangkenggolddepositQ(Quaternary);T3x(Xiaopingfm.,upperTriassic);C1zbb(MemberbofZimenqiaofm1,lowerCarboniferous);C1zaa(MemberaofZimenqiaofm1,lowerCarbonif2erous);1(brecciazone);2(alluvion);3(limestone);4(goldorebody);5(silverorebody)21212,...1,.,,,.21213-.-,,,,,,-,()..,,,60m.,(2).,,.,,031997©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved...,..,,-.,SiO294%,FeOAl2O3,,[6].P1T1Holland[6],.,.213,12.,.NEE,SSE;,3050o,,1530o,,;.4.700.214:.,.,.,..[1],010501075Lm,;,,,0103mm2,01006mm2,,.,,,0100101003mm2.437654nm,27149%80132%(1).,Au92123%94145%,Ag4193%6140%,(2),,,930950..1(%)Table1Reflectanceofnativegold(%)437nm480nm546nm591nm654nmG0406-13a2714936196631957314980132:MPV1;:131:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2(%)Table2Electronmicroprobeanalysisfornativegold(%)AuAgFeCuPbZnG0406-13a9212361401119011901000100100101935G0406-13b9414541930134010001000129100101950:JCXA-733;:()215,.,.,.,.3311,AuAg14(3).3,Au,1112010-9,,Au.3,Ag,115010-6112710-6,.,,,,AuAg.,,AuAg,,AuAg.3(10-6)Table3Traceelementcontentsandconcentrationfactorinregionalstrata(10-6)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-9,(1964);:757;X;K231997©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.3124.,(2518210-6),(32818310-6),(69611410-6),(4613910-6).4(10-6)Table4REEconterntsinoreandwallrocksinChangkeng(10-6)LaCePrNdSmEuGdTbDy1(2)101722012221408143113201180161010701282(1,C1)51601013311183183017401150150010901423(2,T3)651581211041514253178918461547105111261274(2,E)1511002591502617512310020165015816100214716155HoErTmYbLuY2REE2Ce2Y2Ceö2YDEu10.060.210.040.260.051.544613943127311213187015820.080.210.030.150.022.49251822118331995147017931.233.380.553.350.5333.15328183272120561634181214943.329.711.247.221.0557.10696114581148114166510701103Fig13REEPatternfororesandwallrocks1(goldorefromChangkeng);2(lowerCarboniferouslimestone);3(upperTrias2sicmudstone);4(Tertiarytrachyte);:757(3),,,.,,.,.3135,,.46,D34S-714-013,-316,711,214.D34S-414-114,-216,310,113.,,.331:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.5Table5SisotopiccompositionoforebodyandwallrocksinChangkengD34S()31G0802-8-2122G0802-9-1193G0001-5-5184G0405-12-0185K01-1-3116CK-19-0137CK-38-5128CK-147-5139CK-16-71410C-T20-61611C-T21-31112C-T22-11613G0404-8-41414K01-3-21415K01-8-11416CK-34-2133CDT;151315,612167574Fig14HistogramshowingSisotopiccompositionoforeandwallrock1(orebody);2()(wallrock,limestone)431997©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.6Table6VariationofSisotopiccompositioninChangkengD34S,X()D34S()(R)(R)12-316-714-0137112144-216-414-1143101135Fig15HandOisotopesoftheore2formingfluid31451(7),D18O41131615,11152;()DD-11817-4311.DDH2OD18OH2O(5),,..,D18O,,ö,.,.7Table7HandOisotopiccompositionoforeandwallrocksinChangkengD18O()()D18OH2O()DDH2O()1G0305-7ZK0305-713180178+0164-572G0405-9ZK0405-911100178-2116-783G0406-19ZK0406-1911180178-1136-604G3210ZK321011190187-1126-465C-T9CD4-X216150234+6190-118176C-T1CD4-B6()4113185-6188-43117C-T5CD4-B1(C1)10101-371238C-T7ZK1003(C1)151149C-T7CD4-B9(T3)8164-8117310C-T161003(T3)11107-145153:14();510(757).;;SMOW.3315531:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.()[2],().;,,.175234,200(8)..Ca2+K+Na+Mg2+,SO42-,Cl-.8Table8TemperatureoffluidinclusionsoforeinChangkeng()1C-T92342C0406-191783C32101874C-T132255C-T251756C-T32507C-T1225023,757;4411-.,,AuAg,Ag.,.412.,AuAg.AuAgPbZn,,,.413-.,;,;,-