陕西镇坪双河口铌矿床地质地球化学特征与成因探讨
投稿时间:2018-03-27  修订日期:2018-09-14  点此下载全文
引用本文:朱 伟.陕西镇坪双河口铌矿床地质地球化学特征与成因探讨[J].地质与勘探,2018,54(5):929-939
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朱 伟 陕西省地质调查中心陕西西安 武警黄金第五支队陕西西安 西安科技大学 地质与环境学院陕西西安 165324824@qq.com 
基金项目:陕西省公益性地质工作项目(编号:20130101)资助
中文摘要:为了进一步深入认识陕西双河口铌矿床的赋矿特征与矿床成因,本文做了详细的岩石学、矿物学、矿床地球化学研究。结合区域上已有的研究成果,认为镇坪双河口铌矿床是以铌为主的大型矿床,该矿床赋矿地层为奥陶系-志留系斑鸠关组,控矿构造为北西向次级断裂带,赋矿岩石以黑云母粗面岩为主,热液蚀变发育,铌矿化与钠长石化、钠铁闪石化、黑云母化关系密切。矿区粗面质火山岩富碱质,具有Eu负异常,含矿粗面岩富钠、轻稀土元素。矿床成因类型为岩浆热液型,早期岩浆结晶分异初步富集铌-稀土元素,岩浆期后碱质交代作用进一步富集成矿。
中文关键词:铌矿床 地球化学特征 矿床成因 粗面岩 镇坪县双河口
 
Geological and geochemical characteristics and genesis of the Shuanghekou niobium deposit in South Qinling, Shaanxi
Abstract:In order to further understanding the mineralization characteristics and genesis of the Shuanghekou Nb deposit in Zhenping county,Shaanxi, we have made a detailed study on the petrology, mineralogy, and geochemistry of this area. In combination with the existing research results in this region, we suggest that this is a large-scale deposit dominated by niobium. The ore-bearing strata are Banjiuguan Formation of Ordovisn-Silurisn Systems. The ore controlling structure is a northwest trending secondary fault zone. The ore is dominated by biotite trachyte type niobium iron. The ore-hosting rock is the biotite trachyte. The deposit developed a series of hydrothermal alteration. The Nb mineralization is closely related to the albitization and biotitization. The trachyte belongs to shoshonitic series with an Eu negative anomaly and is rich in light rare earth elements and Na2O. The deposits is magmatic hydrothermal-type in genesis. The magma in the early stage of separation and crystallization processes had a preliminary enrichment of niobium-rare earth elements, while the later stage was further enriched and concentrated in ore-formation by alkali metasomatic alteration
keywords:niobium deposit, geological and geochemical characteristics, genesis, trachyte  Shuanghekou of Zhenping county
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