摘要
REEmobilityduringhydrothermalore-formingprocesseshasbeenextensivelyinvesti-gatedinrecentyearsandthepotentialofREEtoprovideinformationaboutoreformingprocesseshascommonlybeenrecognized.TheDongpinggolddeposit,whichislocatedinnorthwesternHebeiProvince,China,occurringintheinnercontactzoneoftheShuiquangousyenitecomplex,isspatially,andprobablygenetically,relatedtothesyenite.Thedepositwasformedunderthemoderatetohightemperature(220℃to320℃),weaklyacidictoweaklyalkaline,ratherhighfo2(lgfo2=-30～-34)environment.TheREEstudyofthehostrocks,alteredwallrocks,oresandganguemineralsfromthedepositsuggeststhattheREEshavebeenmobilizedanddifferentiatedduringK-feldspathizationandsilicification.TheextremelyalteredsyeniteenvelopingauriferousquartzveinshowspositiveCeanomalyandlargerLREE/HREEratiothanthatoftheunalteredsyenite.TheREEconcentrationsandpatternsoftheoresaredeterminedbytheoretypesandmineralassemblages.LREE/HREEratiosintheganguequartzandhydrothermalK-feldsparsarerelativelylow.Themostsignificantobservationisthattheganguequartzshowssig-nificantpositiveEuanomaly,whereasthehydrothermalK-feldsparsshowlesssignificantornopositiveEuanomalyatallrelativetotheprimaryfeldsparintheunalteredsyenite.ItisevidentthattheREEsaremobileduringK-feldspathizationandsilicificationintheoreformingprocess.WeaktomoderateK-feldspathizationcausedREEmobilitywithoutapparentdifferentiationwiththeexceptionofextremeK-feldspathizationandsilicificationwhichresultedinsignificantdepletionofHREEandEuandrelativeenrichmentofCe.TheREE,Y,U,ThandAucontentsofthesyenitedecreaseasthedegreesofK-feldspathizationandsilicificationoftherocksincreasetowardstheauriferousquartzveins.Astheoresweredepositedunderaratheroxidizedenvironment,Ce4+predominatedoverCe3+.Theprecipitationoftheformerinthefor
出版日期
2003年01月11日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
