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1、2012年12月礦床地質(zhì)第31卷第6期December,2012MINERALDEPOSITS31(6):1337-1349文章編號(hào):0258—7106(2012)06—1337—13青海省祁連縣東溝銅礦床成礦特征及成因研究武鵬,馬彥青2,李向民,徐學(xué)義,余吉遠(yuǎn),王國(guó)強(qiáng),一,唐卓,韓媛(1中國(guó)地質(zhì)調(diào)查局西安地質(zhì)調(diào)查中心,陜西西安710054;2青海省第五地質(zhì)礦產(chǎn)勘查院,青海西寧810012;3長(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院,陜西西安710064)摘要通過(guò)對(duì)東溝銅礦床的成礦特征、流體包裹體地球化學(xué)以及礦床成因研究,獲得了如下認(rèn)識(shí):①成
2、礦環(huán)境為晚寒武世的大洋擴(kuò)張脊環(huán)境,容礦巖石為蛇綠巖套上部的基性火山巖,礦床成礦金屬組合為Cu—Zn(少量),圍巖蝕變主要有硅化、綠泥石化、碳酸鹽化及綠簾石化等,其中,硅化、綠泥石化與礦體的關(guān)系最為密切;②對(duì)不同類型礦石中黃鐵礦、黃銅礦的電子探針?lè)治鼍砻鳎哂械蜏鼗蛑械蜏責(zé)嵋撼傻V的特征;③流體包裹體地球化學(xué)研究表明,該區(qū)成礦期石英中包裹體類型簡(jiǎn)單,僅有純液體包裹體和液體包裹體,氣相分?jǐn)?shù)低,液體包裹體氣相成分以o92為主,液相成分主要為H20;礦床成礦流體溫度為150~200℃,鹽度W(NaCI~)為13%~16%,密度為0.87
3、-0.95g/cm3;④礦床屬于“塞浦路斯”型塊狀硫化物礦床。關(guān)鍵字地球化學(xué);成礦特征;流體包裹體;塞浦路斯型礦床;東溝銅礦;北祁連中圖分類號(hào):P618.41文獻(xiàn)標(biāo)志碼:AMetallogeniccharacteristicsandgenesisofDonggoucopperdepositinQilianCounty,QinghaiProvinceWUPeng,MAYanQing2,LIXiangMin,XUXueYi,YUJiYuan,WANGGuoQiang,一,TANGZhuoandHANYuan(1Xi’anInstit
4、uteofGeologyandMineralResources,ChinaGeologicalSurvey,Xi’an710054,Shaanxi,China;2No.5InstituteofGeologyandMineralResourcesExplorationofQinghaiProvince,Xining810012,Qinghai,China3C0llegeofEarthScienceandLandRecourses,Chang’anUniversity,Xi’an710064,Shaanxi,China)Abstra
5、ctBasedonastudyofore—formingcharacteristics,fluidinclusiongeochemistryandgenesisoftheDonggoucopperdeposit,theauthorsobtainedthefollowingunderstanding:①ThemetallogenicenvironmentwasanoceanicspreadingridgeenvironmentinLateCambrian,theore—bearingrocksweremaficvolcanicro
6、cksintheupperpartoftheophiolite,theore—formingmetalswereofCu—Zncombination,andthewall—rockalterationsin—cludedsilicification,chloritization,carbonatizationandepidotization,withsilicificationandchloritizationhavingthemostcloserelationshipwiththeorebody.②Electronmicrop
7、robeanalysesofpyriteandchalcopyriteindif—ferentoresshowlOW—middletemperaturehydrothermalmineralizationcharacteristics.③Geochemicalstudiesoffluidinclusionsshowthatinclusiontypesinquartzarerathersimpleandcompriseonlypureliquidinclusionsandgas4iquidinclusions,withlowgas
8、—liquidratio,andgas—liquidtwo-phaseinclusionsandliquidinclusionsaremainlycomposedofo32andH2Orespectively.Ore—formingfluidshavetempe