变质岩区金矿成矿系统

6219994(,)EarthScienceFrontiers(ChinaUniversityofGeosciences,Beijing)Vol16No12Apr.1999:1998208221:1998212220:,,1949,,,,(:9501107)(:952225)(,,100083),,,,510-960010-9,(410-9510-9),,,K+,SiO2,x(Na+)/x(K+)1,,,,,,CLCP618151,P6121,,,,,,,,,:(1)[1],60,,0101011m,(2),,(3),342(4),,,[2],(5),,[3],,,,,,,,,,2,,,,,,,,,(1)1Table1Goldabundanceofmetamorphicrockw(Au)/10-9w(Au)/10-9[4]41912[5]23160[6]1174714161043646101084814561284153354,(1996),(),(2)[6,7](3),(4)(1993),,017110-931510-9,,4421999,6(2),,(5)2[5]Table2LithochemicalcomponentandgoldabundanceofmetamorphicrockineasternShandongwB/%SiO2Al2O3TiO2CaOMgOFe2O3FeOP2O5MnOK2ONa2Ow(Au)/10-945131713501336186231225106514101030117011701919551107131910197811871063172718501150118114221082155691261418501313141111511691170010801092135310721517063135151440139411021773107412301070110210611941231113118101082145321811316416401010133011101188749105131811173917961974184716101140124116521802026412316143015521941144119721610112010821344183150581241219201484177816311892175011501072151114718303Table3LithochemicalcomponentandgoldabundanceofbasicmetamorphicrockwB/%SiO2Al2O3TiO2CaOMgOFe2O3FeOP2O5MnOK2ONa2Ow(Au)/10-9491351412601858118613941548120134011115321516205812415102017441744128214641810122010821003161524491361416017731528161011671161015621500183010811164Table4Goldabundanceofmeta2morphicrockinSanggangroupw(Au)/10-9481923419716125[8]Table5TheoreticalvalueofgoldabundanceofgreenstoneinTaihuagroupw(Au)/10-9w(Au)/10-9103701815144711392151271720479111472863612147,,,,3,,,,5421999,6(2),,[9],,,,;;;,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4,,,,,,6421999,6(2),,,SiO2H2SiO3,H3SiO-4,NaH3SiO4[10],,(374,2121107Pa),SiO2,,SiO2012%[11][10],w(K)/w(Na),SiO2,w(Cl-)/w(SO2-4),w(Ca2+)/w(Mg2+)(6)6Table6WaterchemicalcomponentofmodernhotspringwB/10-6HCO-3Cl-SO2-4SiO2H2SK+Na+Ca2+Mg2+pHt/[10]11810510101621381045141044104100515340Okuaizu[12]413956690021800477143999011518025502700106004217500112018613810341Osorezan[12]69635138065604832718042271175151334898353830167483015241116187250[13]5131701560401314563230929645,(10-6)()(1)100,w(SiO2)=413t/-440,r=0179;(2)100250,w(K)=0194t/-103,r=0161;(3)250,w(K)=113t/-26388,r=0161,250,,100w(Cl-)/w(SO2-4),w(Cl-)/w(SO2-4)As,Sb,Pb,Zn,Cu;w(Cl-)/w(SO2-4),Au,Hg,,,,,,[13],K,Na,Si,Al,,,,(7),,,,[14],,7421999,6(2),,7Table7ChemicalcomponentoffluidconclusionofgolddepositsinmetamorphicrockprovincewB/10-6H2OCO2CH4Cl-SO2-4COK+Na+Ca2+Mg2+pHEht/[9]55173012301134110165414721839135137-01697250[5]60728181129108101181015910151162146413617-0150265,5,,,,,,,6,,1Fig11Sketchmapofmetallogenicsystemofgolddepositsinmetamorphicrockprovince,,,,,,,,,,,(1),,,,8421999,6(2)111,1986(1):2022062NelsonCE.Hydrothermaleruptionmechanismsandhotspringgolddeposits.EconGeol,1985,80:163316393,11:,1996111964,11:,199511145,11:,198611466,,,11:,199113214387,,,11:,1996111168,,,11:1:,1993196132911:,19951121210BarnesHL.1()1:,1987163107,2333771111:,1993115715912EijiLzawa,MasahiroAoki.GeothermalactivityandepithermalgoldmineralactivityinJapan.Episodes,1991,14(3):26927313,,,11,1994,1(4):14014714,1,:,19881112140METALLOGENICSYSTEMOFGOLDDEPOSITSINMETAMORPHICROCKPROVINCEXiaoRonggeGongYufeiZhaiYushengDengJun(ChinaUniversityofGeosciences,Beijing,100083)AbstractThedefinitionofmetallogenicsystemofgolddepositsinmetamorphicrockprovinceisfirst2lygiveninthispaper.Thesegolddepositsareallformedinorrelatedtometamorphicrock.Thekeyfactortoformmetallogenicsystemofgolddepositsinmetamorphicrockprovincesisgold2bearingforma2tion.Therearemanygold2bearinggreenstoneformationinmetamorphicrockprovinceofChina,suchastheeasternShandong,Wulashanmountain,DaqingshanmountainandYanshanmountaininNorthChi2na,QinlingmountaininthecentricChinaandtheeasternLiaoning.Theirgoldabundanceisabout510-960010-9,somewhathigherthanthatofearthcrustandmantle(410-9510-9).Ase2riesofgolddepositsarediscoveredinthemetamorphicrockprovinces,theirgoldelementsareoriginat2edfromgold2bearingformation.Metamorphism,includingregionalmetamorphism,migmatization,struc2turalshearing,partialmeltingandtheformationofremeltingmagma,mayresultinthegoldelementsofgold2bearingformationtoberedistributed,suchastobeenrichedandimpoverished.Exsolutionandmetasomatismofalkalinecomponentplaysapositiveroleinactivation,leachingandprecipitating,min2eralizationofgoldduringmetamorphicprocess.Thereforegoldmetallizationisaccompaniedwithpotas2sicalteration,silicationandalkaligranite.ThehighercontentsofK+andSiO2,thevalueofx(Na+)/x(K+)beingabout1inthemetamorphicfluidshowthatthealkalinecomponent,particularlythe9421999,6(2)potassiccomponent,playsanimportantroleintheformationofgolddeposits.Becausethechemicalpropertiesofgoldelementisverystable,whiletheoriginalsulphidetypeofgolddepositisweatheredanddestroyed,detritalmineralsareredeposited,enrichedandthenformedthealluvialgoldplacerbysupergenesis.Throughthetracingofthewholeprocessofgoldevolution,amodelofmetallogenicsystemcanbeestablishedforthegolddepositsinmetamorphicrockprovince.Keywordsgolddepositsinmetamorphicrockprovince,metallogenicsystem,golddeposittype,gold2bearingformation(1)19998,200034(2)20004,200091