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CHARACTERISTICSANDFORMINGPROCESSOFORE-FORMINGFLUIDSATQULONGCOPPERDEPOSITINGANGDISEPORPHYRYCOPPERBELT,TIBET
YANGZhi-ming1,XIEYu-ling1,LIGuang-ming2,XUJiu-hua1
(1.TheCivilandEnvironmentalEngineeringSchool,BeijingUniversityofScienceandTechnology,Beijing 100083;
2.ChengduInstituteofGeologyandMineralResource,MinistryofLandandResource,Chengdu 610082)
Abstract:TheQulongcopperdepositisatypicalporphyrycopperdeposit(PCD),anddiscoveredintheeastGangdiseporphyrycopperorebeltofTibe.tThreetypesoffluidinclusions,namelyliquid,gas-richanddaughtermineral-bearinginclusions,havebeenfound.Fluidinclusionsfromthisdeposithaveasalinitybetween0.5and52.5wt%NaCleq,andhomogenizationtemperaturesrangebetween190and510 .H2OisdominatedintheliquidandgasphasesbylaserRamanspectroscopy(LRM),atthesametimeminorCO2-hasbeendetectedtoo.Boiling,whichisprovedbythecoexis-3tingofliquid,gas-richandthedaughtermineral-bearinginclusionswithsimilarhomogenizationtemperatures,isanimportantfactorduringtheminera-l
++
ization.Ore-formingfluidsofQulongcopperdepositisrichinCl-,SO2-andCO2-withhighsalinityandstrongsolubilityofcopper,ac-4,Na,K3
cordingtoalteredmineralassemblageandtheanalysisofLinkamTHMS600andLRM.
Keywords:fluidinclusion,fluidevolution,Qulongporphyrycopperdeposit,Gangdise