湘东北传梓源稀有金属花岗伟晶岩地球化学特征

发布时间：2018-02-06 02:45

本文关键词： 花岗伟晶岩幕阜山锂辉石稀有金属湖南　出处：《矿物岩石地球化学通报》2016年01期 　论文类型：期刊论文

【摘要】：传梓源矿床是湖南省平江县一处典型的伟晶岩型Li、Nb和Ta稀有金属矿床,为了研究伟晶岩成矿作用以及指导湘东北地区稀有金属找矿工作,采用XRF、ICP-MS和ISE法分析了锂辉石伟晶岩和钠长石伟晶中主量、微量元素和挥发分。结果表明,伟晶岩Al_2O_3(13.37%~16.48%)和Na_2O(4.38%~7.41%)含量高,K_2O(0.85%~3.05%)、Ca O(0.16%~0.83%)、稀土元素含量(3.5×10~(-6)~19.26×10~(-6))极低,较弱的Eu负异常,强烈富集Rb、U、Li、Nb、Ta元素,亏损Ba、Sr、Ti元素,挥发分含量较低。这些特征表明伟晶岩是岩浆高程度演化分异作用形成的,F-稀有金属络合物在岩浆不混溶过程中迁移到浅部,在锂辉石化和钠长石化过程络合物发生水解,Li、Nb和Ta在伟晶岩中富集成矿,F则大量逃逸或远程迁移到浅地表形成萤石。
[Abstract]:Chuanziyuan deposit is a typical pegmatite Linnb and Ta rare metal deposits in Pingjiang County Hunan Province. In order to study pegmatite mineralization and guide the exploration of rare metals in northeast Hunan Province. The main contents, trace elements and volatile matter in spodumene pegmatite and albite pegmatite were analyzed by XRF- ICP-MS and ISE. Al _ 2O-T _ 3s _ _ _. The content of rare earth elements is 3.5 脳 10 ~ (10) ~ (-6) and 19.26 脳 10 ~ (2) ~ (6) ~ (6), the weak EU negative anomaly and the strong enrichment of RB. These characteristics indicate that the pegmatite is formed by the high degree of magmatic evolution and differentiation. F- rare metal complexes migrate to the shallow in the process of magmatic immiscibility, and the complexes hydrolyze in the process of spodumenization and albite formation. The complexes are rich in integrated ore in pegmatite. F escapes or migrates to the shallow surface to form fluorite.
【作者单位】：湖南省地质调查院;中南大学地球科学与信息物理学院;
【基金】：中国地质调查局地质调查项目(1212011220817) 湖南三稀资源综合研究与重点评价项目(资[2014]03-007-007)
【分类号】：P588.131;P618.6

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