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《越南O Quy Ho钼矿床的成矿时代及成矿物质来源探讨.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2010年4月矿床地质第29卷第2期April,2010MINERALDEPOSITSV01.29No.2文章编号:0258—7106(2010)02—0371—08越南OQuyHo钼矿床的成矿时代及成矿物质来源探讨TRAINMyDung一,刘俊来一,NGUYENQuangLuat2,陈越,邹运鑫(1中国地质大学地质过程与矿产资源国家重点实验室,北京100083;2河内地质与矿业大学,越南河内)摘要越南西北部OQuyHo钼矿床为范士版成矿带的典型钼矿床之一,矿体以脉状形式就位于中生代花岗岩中,辉钼矿主要赋存于石英脉及长石石英脉
2、中,与黄铁矿、黄铜矿、磁铁矿等共生。8件样品硫同位素分析结果表明,S介于0.14‰~3.34‰之间,平均值为1.53%,表明成矿物质具有深源特征。黄铁矿的206Pb/2o4Pb范围为18.583-22.355,胛pb/zo4Pb变化于15.632~15.812之间,20spb/ePb变化于38.989~39.199;辉钼矿的006pb/2o4Pb207Pb/2叫Pb、20Pb/204pb分别为18.68618.737、15.65515.660和39.081-39.082,与范士版含角闪石花岗斑岩具有成因联系。辉钼矿Re-Os同
3、位素等时线测年获得了(36±1)Ma的年龄,该年龄与金沙江一红河新生代斑岩铜钼矿成矿带岩浆一成矿活动的年龄一致,提出OQuyHo钼矿床为金沙江一红河新生代斑岩铜钼矿带的一部分。关键词地球化学;Re-Os同位素年龄;0QuyHo钼矿床;金沙江一红河斑岩铜钼矿带;哀牢山剪切带;越南西北中图分类号:P618.65文献标志码: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
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