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1、2013年6月矿床地质第32卷第3期June,2013MINERALDEPOSITS32(3):603～613文章编号:0258-7106(2013)03-0603-11云南元阳菲莫铜钼多金属矿床成因及成矿模式1,2111111吴自成,刘继顺,董新,欧阳玉飞,刘文恒,王天国,于换涛(1中南大学地球科学与信息物理学院,湖南长沙410083;2甘肃有色金属地质研究所,甘肃兰州730000)摘要文章在矿床地质、地球化学及同位素年代学研究的基础上,总结了菲莫铜钼多金属矿床的成因及理想模式。矿床中岩、矿石S、Pb同位素组成显示,矿床成矿物质主要来源于深部地幔或下地壳古老基底
2、,后混入部分上地壳物质;H、O同位素特征显示,矿床成矿热液以上升的岩浆热液为主,结合部分变质热液及渗透淋滤的大气降水形成混合热液;Re-Os同位素测年得出矿床形成时间为(47.81±0.71)Ma,矿化主要发生于大皮甲岩体岩浆侵位晚期的期后热液阶段。矿床成因类型属沉积-变质-岩浆热液叠加改造型铜钼多金属矿床。成矿作用具长期性、多期次、多来源、多阶段、多成因的特征,大致经历了古元古代的沉积定位阶段※中新元古代的区域变质改造富集阶段※喜马拉雅期的颠覆性改造叠加富集成矿阶段。关键词地球化学;变基性火山岩;热液改造;成矿模式;菲莫铜钼多金属矿床;云南中图分类号:P618.
3、41;P618.65文献标识码:AOregenesisandmetallogenicmodelofFeimoCu-MopolymetalicdepositinYuanyang,YunnanProvince1,21111WUZiCheng,LIUJiShun,DONGXin,OUYANGYuFei,LIUWenHeng,11WANGTianGuoandYUHuanTao(1SchoolofGeosciencesandInfo-Physics,CentralSouthUniversity,Changsha410083,Hunan,China;2GansuInstitu
4、teofGeologyforNonferrousMetals,Lanzhou730000,Gansu,China)AbstractInthispaper,theauthorssummarizedthemetallogenicmodeloftheFeimoCu-Mopolymetalicdepositonthebasisofgeological,geochemicalandisotopicgeochronologicalcharacteristicsoftheoredeposit.TheS,Pbisotopesofrocksandoresshowthatthemet
5、allogenicmaterialwasderivedfromdeepmantlesource,withthead-ditionofacertainamountofcrust-derivedmaterialatthelatestage.H,Oisotopecharacteristicsshowthattheore-forminghydrothermalfluidoriginatedfromascendingmagmatichydrothermalsolutionincombinationwithmixedhydrothermalsolutionsdominated
6、bypermeablemeteoricwater.StatisticRe-Osisotopedatingofthede-posityielded(47.81±0.71)Ma.Themainmineralizationoccurredinthepost-magmatichydrothermalstageoflateDapijiarockmassmagmaticemplacement.Theoredepositgeneticallybelongstothesedimentation-meta-morphism-magmatichydrothermalsolutions
7、uperimposeddeformationtypeCu-Mopolymetallicdeposit.Themineralizationofthedepositwascharacterizedbylongperiod,multi-phase,poly-source,poly-stageandmulti-genesis,andtheore-formingprocessexperiencedthesedimentarylocatingstageofProterozoic,regionalmeta-morphism-reformation-enrichmentstage
8、ofmid
