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黑龙江省多宝山斑岩型铜_钼_矿床成矿流体特征及演化.pdf

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1000-0569/2010/026(05)-1450-64ActaPetrologicaSinica岩石学报 黑龙江省多宝山斑岩型铜(钼)矿床成矿流体 * 特征及演化 刘军1，2武广1，3＊＊钟伟1朱明田1，2 LIUJun1，2，WUGuang1，3＊＊，ZHONGWei1andZHUMingTian1，2 1.中国科学院广州地球化学研究所成矿动力学重点实验室，广州510640 2.中国科学院研究生院，北京100049 3.中国地质科学院矿产资源研究所，北京100037 1.KeyLaboratoryofMetallogenicDynamics，GuangzhouInstituteofGeochemistry，ChineseAcademyofSciences，Guangzhou510640，China 2.GraduateSchoolofChineseAcademyofSciences，Beijing100049，China 3.InstituteofMineralResources，ChineseAcademyofGeologicalSciences，Beijing100037，China 2010-02-06收稿，2010-04-01改回. LiuJ，WuG，ZhongWandZhuMT.2010.FluidinclusionstudyoftheDuobaoshanporphyryCu(Mo)deposit， HeilongjiangProvince，China.ActaPetrologicaSinica，26(5):1450－1464 AbstractThelarge-sizedDuobaoshanporphyryCu(Mo)deposit，locatedinthenorthwesternpartofLesserHingganRange，isthe biggestporphyryCu(Mo)depositinthenortheastsectionofCentralAsian-Mongolian-Hingganorogenicbelt.Itsorebodiesaremainly hostedinCaledoniangranodioriteandMiddleOrdovicianDuobaoshanFormationandesiteandtuff.Coppermineralizationisclosely associatedwithsilicificationandsericitization，andmolybdenummineralizationoccursmainlyinsilicification-potassicfeldspathization zone.Sixmaintypesofveinshavebeenidentified，namelyquartz-potassicfeldsparvein，earlystagequartz-molybdenitevein，late stagequartz-molybdenitevein，quartz-chalcopyrite-pyritevein，quartz-pyriteveinandcalcite-quartzvein.Fourtypesoffluidinclusions aredistinguishedfromvariousquartzveins，i.e.aqueoustwo-phase(W-type)，purevapor-phase(G-type)，CO2-bearingthree-phase (C-type)anddaughtermineral-bearingmultiphase(S-type)inclusions.Fluidinclusionsofthequartz-potassicfeldsparveinaremainly aqueoustwo-phaseinclusions，theirhomogenizationtemperaturesandsalinitiesvary＞550℃andfrom16.2%to18.1%NaCl equivalent，respectively.Fluidinclusionsoftheearlystagequartz-molybdeniteveinaremainlycomposedofaqueoustwo-phaseand daughtermineral-bearingmultiphaseinclusionswithminorCO2-bearingthree-phaseinclusions，theirhomogenizationtemperaturesand salinitiesvaryfrom350℃to450