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1、2010年4月礦床地質(zhì)第29卷第2期April,2010MINERALDEPOSITSV01.29No.2文章編號:0258—7106(2010)02—0371—08越南OQuyHo鉬礦床的成礦時代及成礦物質(zhì)來源探討TRAINMyDung一,劉俊來一,NGUYENQuangLuat2,陳越,鄒運(yùn)鑫(1中國地質(zhì)大學(xué)地質(zhì)過程與礦產(chǎn)資源國家重點(diǎn)實(shí)驗(yàn)室,北京100083;2河內(nèi)地質(zhì)與礦業(yè)大學(xué),越南河內(nèi))摘要越南西北部OQuyHo鉬礦床為范士版成礦帶的典型鉬礦床之一,礦體以脈狀形式就位于中生代花崗巖中,輝鉬礦主要賦存于石英脈及長石石英脈
2、中,與黃鐵礦、黃銅礦、磁鐵礦等共生。8件樣品硫同位素分析結(jié)果表明,S介于0.14‰~3.34‰之間,平均值為1.53%,表明成礦物質(zhì)具有深源特征。黃鐵礦的206Pb/2o4Pb范圍為18.583-22.355,胛pb/zo4Pb變化于15.632~15.812之間,20spb/ePb變化于38.989~39.199;輝鉬礦的006pb/2o4Pb207Pb/2叫Pb、20Pb/204pb分別為18.68618.737、15.65515.660和39.081-39.082,與范士版含角閃石花崗斑巖具有成因聯(lián)系。輝鉬礦Re-Os同
3、位素等時線測年獲得了(36±1)Ma的年齡,該年齡與金沙江一紅河新生代斑巖銅鉬礦成礦帶巖漿一成礦活動的年齡一致,提出OQuyHo鉬礦床為金沙江一紅河新生代斑巖銅鉬礦帶的一部分。關(guān)鍵詞地球化學(xué);Re-Os同位素年齡;0QuyHo鉬礦床;金沙江一紅河斑巖銅鉬礦帶;哀牢山剪切帶;越南西北中圖分類號:P618.65文獻(xiàn)標(biāo)志碼:AMetallogenicepochandmetallicsourcesofOQuyHomolybdenumdeposit,VietnamTRANMyDung一,LIUJunLai一,NGUYENQuangLua
4、t2,CHENYueandZOUYunXin(1StateKeyLaboratoryofGeologicalProcessesandMineralResources,ChinaUniversityofGeosciences,Beijing100083China;2HanoiUniversityofGeologyandMining,Hanoi,Vietnam)AbstractThe0QuyHooredepositisatypicalmolybdenumdepositinthePhanSiPanmetallogenicbelt,n
5、orthwestVietnam.OrebodiesoccurasquartzveinsorquartzofelspathicveinsintrudingMesozoicgranite.Molybdenitehasformedartoremineralizationscquencewithpyrite,chalcopyrite,magnetiteandsomeotherminerals.The4Svaluesofpyriteandmolytxtenitearebetween0.14‰and3.34‰,withanaverageo
6、f1.53%,impl~ngthatsdfurofore-formingmaterialswasderivedfromadeepsource.The20Ph/2o4Pb,0Pb/204Pband08pb/204Pbratiosofpyritevaryinrangesof18.583-22.355,15.63215.812,38.989-39.199;therangesof2(】Pb/20Pb,2o7pb/2O4pband20Pb/oPbratiosformolybdenite&re18.686-18.737,15.655~15
7、.660and39.081~39.082,re—spectively.TheuniformPbisotopecompositionsoftheoredepositimplythattheoremineralizationsequenceispossiblyrelatedtOthePhanSiPanamphibole-bearingporphyriticintrusionsofthes&rneage.Re-Osdatingofmolybdenitesamplesgivesanisochronageof(36±1)Ma,sugge
8、stingthattheOQuyHooredepositisapartoftheJinshaRiver-RedRiverporphyryCu-Nomineralizationbelt.Keywords:geochemistry,Re-Osisochronage,OQuyH0m