简介：

简介：Discriminationsinalocalchemical,fluidal,mechanicalandthermalprocessesinashearzonewillleadtometallogenicdifferentiationinalocalsection.Thispaper,basedonthegeneralgeologicalsettingoftheShibangougolddepositinXixia,Henan,dealswithpetrologicalandpetrochemicalsamplesofalteredrocksinthemetallogenicsectionandofmylonitesinthenon-metallogenicsectionofaselectedshearzone.Thediscriminationsinfluid-rockinteractionandpetrologicalmassbalancebetweenalteredrocksneartheorebodyandmylonitesintheshearzonearediscussedaswell.Theresultsshowthatthepetrologicalvolumeofalteredrocksinthemetallogenicsectionoftheshearzoneisalmostalwaysdilatantandthemylonitevolumeinthenon-metallogenicsectionisalmostalwayslost.Majorelementsinalteredrocksfromthemetallogenicsectionandinmylonitesfromthenon-metallogenicsectionalwaysshowatendencyofbeingenrichedanddepleted,respectively.Fluid-rockratiosinthemylonites(Nu=93.68-468.40)arelargerthanthoseofthealteredrocks(NC(Ⅳ）^s=36.11-216.67).Thegainandlossofmajorandtraceelementsfromthealteredrocksandmylonitesintheshearzoneareacompositeprocesstobeimportedandexportedbypercolatingfluidsaswellasofthelossanddilatancyofrockvolume.