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《桂北沙子江铀矿床流体包裹体初步研究.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、2011年2月矿床地质第30卷第1期February,2011MINERALDEPOSITSVo1.30N0.1文章编号:0258—7106(2011)01—0033—12桂北沙子江铀矿床流体包裹体初步研究石少华,一,胡瑞忠一,温汉捷,赵肖芒3,宋生琼一,魏文凤,2(1中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002;2中国科学院研究生院,北京100049;3金原铀业公司桂林分公司,广西桂林541400)摘要对沙子江矿床内与成矿关系密切的各成矿阶段石英中流体包裹体进行了研究,显示成矿早阶段部分高温流体对铀的迁移可能发挥了一定
2、作用,而整个成矿过程中主要成矿流体为中一低温、低盐度及中等密度热液。含子矿物包裹体可能捕获于流体沸腾作用过程中。沸腾作用降低了成矿流体中碳酸铀酰络离子的浓度,有利于铀的沉淀。成矿晚阶段,源自赋矿的富烃花岗岩体中烃类组分的加入为营造铀沉淀的还原环境贡献了力量,同时,这类富烃的花岗岩体对铀矿体形成以后的保存也到起了很大的作用。关键词地球化学;成矿流体;烃类包裹体;沙子江;苗儿山;桂北中图分类号:P619.14文献标志码:AAtentativediscussiononfluidinclusionsinquartzveinsofShazijianguran
3、iumoredeposit,northernGuangxiSHIShaoHua一,HURuiZhong,WENHanJie,ZHAOXiaoMang3,SONGShengQiong,andWEIWenFeng,2(1StateKeyLaboratoryofOreDelmsitGeochemistry,InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang550002,Guizhou,China;2GraduateUniversityofChineseAcademyofSciences,Bei
4、jing100049,China;3GuilinBranchofJinyuanUrani—ulnCorporation,ChinaNationalNuclearCorporation,Guilin541400,Guangxi,China)AbstractTheMiaoershanuraniumorefield,oneofthefivelarge—sizeuraniumorefieldsincentralSouthChina,hoststheChanzipinguraniumoredeposit,whichisthelargestcarbonaceo
5、us—siliceous—peliticrocktypeuraniumorede—positinChina,andsomegraniteuraniumoredeposits.Aseriesofpetrographic,microthermetricandLaserRa—manmicrospectroscopicstudiesoffluidinclusions(FI)inthequartzveinsoftheShazijianguraniumoredeposit,oneoftheimportantgranite—hosteduraniumoredep
6、ositsintheorefield.werecarriedoutbytheauthors.FivetypesofF1wereobservedoridentified,namelyliquidFI,daughtermineral—bearingFI,puregasFI,pureliquidFIandhydrocarbonFI.Asthemainfluidinclusiontypeofthewholeore—formingprocess,liquidFIhavechar—acteristicsoftheore—formingfluid.Thehomo
7、genizationtemperatures,salinitiesanddensitiesofliquidFIareintherangeof109.0~342.6℃,0.53%-7.73%,and0.71~1.02g/cm3respectively.Itisconcludedthatpartofhigh—temperature(>300~2)fluidscarriedsignificantamountsofuraniumattheearlyore—formingstage.Ofcourse,dominantore—formingfluidsarec
8、haracterizedbylow—moderatetemperature,1OWsalinityandmoderated
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