TheHongshijinggolddeposit,whichoccursintheMiddleandLateCarboniferousvolcanicandpyroclasticrocks,isofthebrittle-ductileshearzonetypecontrolledbyariftbelt.TheHongshijinggolddepositisonecontrolledbyabrittleshearzonelocatedintheLatePaleo-zoicriftzone.Thealtered-rocktypeandquartztypeorebodiesarecontainedinthegold-bearingformation,whichconsistsofbasaltandtuffaceoussandstone.Themajormineralizingstageisat267-261Maandreiterationmineralizingstageat220-209Ma.Theoremineralsincludepy-rite,magnetite,copper,bornite,ferrohydrite,nativegold,andtheganguemineralsincludequartz,sercite,calcite,Fe-dolomite,leucoxene,anorthose,biotite,baria,cajuelite,andagustite.Thewallrockalterationassociatedwithgoldmineralizationcomprisessilicification,carbonization,pyritization,sericitizationandchloritization.Thecontentsofgoldare2.4×10-9inthegold-bearingformation,5.7×10-9inthetuffaceoussandstoneand1.4-1.5×109inthebasalt.AuisassociatedwithTe,Se,Ni,Cu.Au=74.331×Te+0.0335×Ni-0.0211×Cu-2.650.Geochemicalinvestigationsrevealedthatthemineralizingmaterialscamefromthebasaltandtuffaceoussandstoneinthegold-bearingformation.Undertheactionofductilebrittleshearstructure,thegold-bearingformationwasmetamorphosedandaltered,andtheore-formingmaterialsactivated,migratedandmineralized.Themineralizingfluidshowsthreemineralizingstages,withthecharacteristicsofmiddletolowtemperature(381-115℃)andmiddletolowmassfractionsofNaCl(2.18%-16.77%).ThefluidisoftheCa2+-Mg2+-Na+-Cl-typeandH2O-NaClsystem.Accordingtothedatafromhydrogenandoxygenisotopiccomposition(δD=-114.6‰--68.8‰,δ18OH2O=-2.47‰-5.91‰),theconclusioncanbedrawnthatthemineralizingfluidoftheHongshijinggolddepositwasakindofmixedhydrothermalsolutioncomposedmainlyofmeteoricwater,magmaticwaterandformationwaterinbas
