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赣西北大湖塘钨矿富锂-云母化岩锂元素富集机制及其对锂等稀有金属找矿的启示
投稿时间:2019-10-03  修订日期:2020-05-15  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020218
摘要点击次数: 72
全文下载次数: 182
作者单位E-mail
张勇 东华理工大学核资源与环境国家重点实验室 江西 南昌 zhycy2004@163.com 
潘家永 东华理工大学核资源与环境国家重点实验室 江西 南昌 jypan@ecit.cn 
马东升 南京大学地球科学与工程学院 江苏 南京  
基金项目:国家重点研发计划(编号2016YFC0600207、2014CB440904);核资源与环境国家重点实验室基金(编号NRE1916、Z1906);中国地质调查局整装勘查项目(编号12120114034501);国家自然科学基金项目(编号4196020054)
中文摘要:赣西北大湖塘钨矿具有低品位、大储量、热液蚀变强等特征。在热液蚀变类型和空间分带特征的厘定,以及富锂-云母矿物学特征的认识基础上,通过云母类矿物原位主微量元素组成特征的分析,揭示大湖塘钨矿锂等稀有金属元素的富集,可能是大量热液成因黑鳞云母、铁锂云母和锂-多硅白云母的先后沉淀叠加聚集的结果。其中铁锂云母的锂元素含量最高(Li2O=4.15%~4.86%),黑鳞云母(Li2O=0.81%~1.72%)次之,然后是锂-多硅白云母(Li2O=0.24%~0.45%)。大湖塘钨矿富锂-云母在蚀变岩中比例非常高,分布又均匀,而蚀变岩的规模更是巨大,因而具有巨大锂等稀有金属成矿的潜力。典型蚀变岩的全岩主微量元素分析显示,在晋宁期花岗闪长岩黑鳞云母+铁锂云母蚀变带的锂、铷和钾等元素含量最高。即富钾热液蚀变岩,其K2O=5.94%~8.06%,Li2O=0.34%~1.548%和Rb2O=0.175%~0.784%,而黑鳞云母+铁锂云母+石英蚀变则次之。在燕山期花岗岩中,则以锂元素富集为主,铷含量相对偏低。高含量样品主要集中在钠化带,其Na2O=5.79%~6.17%,Li2O=0.902%~1.034%和Rb2O=0.140%~0.213%,而锂-多硅白云母+石英的蚀变岩则相对略低。大湖塘钨矿燕山期花岗岩以多期多阶段的脉动活动为特征,特别是晩阶段相对富锂、铷和钨,这是大湖塘钨矿锂、铷和钨富集成矿的物质基础。对比雅山钽锂矿和赣南钨矿的蚀变空间分带特征,我们进一步探讨了铌钽矿、锂铷矿和钨矿之间的岩浆-热液演化过程,即铌钽矿以结晶分异为主,锂铷为结晶分异和碱性热液阶段,最晚的是钨矿的酸性热液阶段。认为赣西北地区乃至华南,着重对热液蚀变空间分带的厘定,特别是在钨矿深部内接触带的云英岩化和钠长石化带,是寻找富锂-云母化蚀变岩型锂铷多金属矿重要标志,即“就钨找锂铷”。这可能是稀有金属找矿突破的重要方向之一。大湖塘钨矿富锂-云母类的巨量富集成矿及其富集过程,是本次研究工作的重要发现,也将是大湖塘钨找矿认识的重要突破。
中文关键词:锂-云母,热液蚀变,矿物微量,就钨找锂铷,大湖塘钨矿,赣西北
 
Lithium element enrichment and inspiration of the prospecting for rare-metal mineralization at the Dahutang tungsten deposit: constraints from mineralogy and geochemistry of the hydrothermal alteration
Author NameAffiliationE-mail
Zhang Yong State Key Laboratory of Nuclear Resources and Environment,East China University of Technology zhycy2004@163.com 
Pan Jiayong State Key Laboratory of Nuclear Resources and Environment,East China University of Technology jypan@ecit.cn 
Ma Dongsheng School of Earth Sciences and Engineering,Nanjing University  
Abstract:In recent years, a series of rare metals and tungsten prospecting breakthroughs have made in the northwestern Jiangxi. Especially, the Li-Rb enrichment and mineralization is for the first time reported at the Dahutang giant tungsten deposit. It shows an obvious distinction, probably a genetic relationship between the W and Li-Rb deposit. The Dahutang tungsten deposit have a characteristic of low grade, high tonnage, and strongly hydrothermal alteration. Basin on the identification of mineralogy of Li-mica and hydrothermal alteration type. The hydrothermal Li-mica were zinnwaldite (Li2O=4.15%~4.86%), protolithionite (Li2O=0.81%~1.72%), and Li-phengite (Li2O=0.24%~0.45%). We chose 47 altered hand specimen for whole rock geochemistry analysis. Research shows lithium mineralization mostly for the enrichment of Li-mica at the Dahutang tungsten deposit. The protolithionite and zinnwaldite altered Neoproterozoic granodiorite sample have a characteristic of highly concentrated of K2O (5.94%~8.06%), (Li2O=0.34%~1.548%) and Rb2O (0.175%~0.784%). However, the trilithionite, paragonite and albite Yanshanian altered porphyritic biotite granite have a characteristic of highly concentrated of Na2O (5.79%~6.17%),Li2O (0.902%~1.034%), and Rb2O (0.140%~0.213%). Significantly, the unaltered Yanshanian granite have a characteristic of multi-phase magmatic activity, but all enriched in Li, Rb, and W. Potentially, further enrichment and mineralization due to the hydrothermal fluid circulation. This work demonstrate a precipitation sequence from the magmatic Nb-Ta mineralization to Li-Rb, and then the W-Mo hydrothermal deposit. Preliminary study could be conducive to a new direction for the regional and deep prospecting of rare metals in the tungsten deposit at the northwestern Jiangxi.
keywords:Mica, LA-ICP-MS, Hydrothermal Alteration, Rare-Metal Mineralization, Dahutang tungsten deposit, Northwestern Jiangxi
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