江西银山铅锌矿床闪锌矿与石英流体包裹体对比研究  

Comparison of fluid inclusions in coexisting sphalerite and quartz from Yinshan deposit,Dexing,Northeast Jiangxi Province

作　　者：王国光[1] 倪培[1] 赵葵东[1] 刘家润[1] 解国爱[1] 徐积辉 张志辉 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室地质流体研究所地球科学与工程学院,南京210093 [2]江西铜业集团地勘工程公司,德兴334201 [3]江西铜业集团银山矿业公司,德兴334201

出　　处：《岩石学报》2011年第5期1387-1396,共10页Acta Petrologica Sinica

基　　金：全国危机矿山接替资源找矿项目(20089935)资助

摘　　要：赣东北地区是我国重要的铜铅锌金银多金属矿集区,银山铅锌(银)铜(金)多金属矿床是赣东北地区一个重要的大型次火山热液型多金属矿床。银山铅锌矿发育有闪锌矿-方铅矿-石英脉,前人研究认为金属矿物与脉石矿物为伴生关系,但是没有强调它们的成因上的联系。本次研究开展了矿石矿物中闪锌矿和伴生脉石矿物中石英的流体包裹体对比研究。通过详细的岩相学观察、显微测温、显微激光拉曼探针工作,对伴生石英脉和闪锌矿内原生包裹体,伴生石英脉中的晚期微细石英脉和闪锌矿内部次生包裹体进行流体特征的对比研究。研究结果显示,伴生石英脉原生流体包裹体比闪锌矿的原生包裹体的平均均一温度高约30℃,明显富集CH4、N2、CH4、CO2等挥发份,伴生石英脉中的晚期微细石英脉流体包裹体比闪锌矿次生包裹体的平均均一温度高23℃。闪锌矿原生包裹体与想伴生的早期石英脉在平均均一温度有所差别,气相成分差异明显,均表明矿石矿物与伴生脉石矿物可能形成于不同的地质环境,具有不同的温度和流体成分。Dexing district of Northeast Jiangxi Province is one of the large ore concentrating areas in the eastern metallogenic belt of China.Yinshan lead-zinc-copper（gold）polymetallic deposit is one of large subvolcanic hydrothermal ore deposit,China.Mineralization consists of quartz,sphalrite,galena,and various amounts of base metal sulfides in veins.Texture evidence shows that the ore minerals（e.g.sphalerite and galena）are spatially associated with quartz veins and veinlets.Previous studies of fluid inclusions mainly focus on quartz vein associated with sphalerite.In this study,we use petrography,microthermometry and Raman analysis to study on the fluid inclusions in sphalerite and quartz in early quartz veins,and in late quartz veinlets.The results show that there are different from the types of fluid inclusions,homogenization temperatures（Th）and salinity between sphalerite and coexisting quartz veins.The early quartz veins contain two-phase,aqueous-carbonic inclusions,and have average homogenization temperature of 249.8℃ and salinity of 8.3% NaCleqv.The two-phase,aqueous inclusions occur in sphalerite and late quartz veinlets,with Th of 224.0℃,168.2℃,and salinity of 8.1% NaCleqv,4.3%NaCleqv,respectively.Therefore,we conclude that the fluid inclusions in gangue minerals in Yinshan deposit can not provide reasonable estimates of the depositional conditions of the ore minerals,even though they are intimately intergrown.

关 键 词：流体包裹体 闪锌矿 石英 银山 赣东北 

分 类 号：P589.1[天文地球—岩石学] P618.42[天文地球—地质学]