| 湖南尖峰岭稀有金属花岗岩地球化学特征及成矿作用 |
| Received:March 27, 2016 Revised:October 28, 2016 点此下载全文 |
| 引用本文：WEN ChunHua,SHAO YongJun,HUANG GeFei,LUO XiaoYa,LI ShengMiao.2017.Geochemical features and mineralization of Jianfengling rare metal granite in Hunan Province[J].Mineral Deposits,36(4):879~892 |
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| Author Name | Affiliation | | WEN ChunHua | School of Geoscience and InfoPhysics, Central South University, Changsha 410083, Hunan, China
Hunan Institute of Geological Survey, Changsha 410116, Hunan, China | | SHAO YongJun | School of Geoscience and InfoPhysics, Central South University, Changsha 410083, Hunan, China | | HUANG GeFei | Hunan Institute of Geological Survey, Changsha 410116, Hunan, China | | LUO XiaoYa | Hunan Institute of Geological Survey, Changsha 410116, Hunan, China | | LI ShengMiao | Hunan Institute of Geological Survey, Changsha 410116, Hunan, China |
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| 基金项目:本文得到华南重点矿集区稀有稀散和稀土矿产调查项目（编号：DD20160056），中南大学博士后课题，湖南省自然科学基金（编号：2017JJ3138）、湖南省地质矿产勘查开发局科研项目（编号：201703-02）和深地资源勘查开采重点专项（2017YFC0602402）联合资助 |
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| 中文摘要:湖南尖峰岭矿床是一个典型的花岗岩型Li、Nb和Ta稀有金属矿床，为研究花岗岩成矿作用以及指导湘南地区稀有金属找矿工作，采用XRF、ICP-MS和ISE法分析了与成矿有关的黑云母花岗岩、钠长石花岗岩及云英岩的中主量、微量元素和挥发分。结果表明：钠长石花岗岩和云英岩中的SiO2（70.6%~84.85%）和挥发分F（2.43%~3.74%）质量分数高，富Al2O3（9.36%~22.99%），且A/CNK>1.0，为过铝质岩石，全碱（w（Na2O+K2O）=1.51%~7.52%）和w（CaO）（0.1%~3.44%）变化大，w（Fe2O3）、w（MgO）、w（TiO2）、w（MnO）、w（P2O5）较低；稀土元素组成具显著的Eu负异常和"M"型四分组效应，强烈富集Rb、Th、U、Nb、Ta元素，亏损Ba、Sr、Ti元素。花岗岩地球化学特征显示在演化过程中经历了高程度分异演化作用和岩浆不混溶作用，其挥发分F对稀有元素有明显的富集作用，并制约着熔体/流体体系的地球化学行为及其成矿效应。钠长石花岗岩和云英岩的稀有金属富集成矿受到岩浆不混溶作用、水岩反应、风化淋滤作用的共同控制。 |
| 中文关键词:地球化学 铌-钽-锂 钠长石花岗岩 云英岩 富F花岗岩 尖峰岭 |
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| Geochemical features and mineralization of Jianfengling rare metal granite in Hunan Province |
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| Abstract:The Jianfengling deposit, which is located in Linwu County of Hunan Province, is a typical granite-type Nb-Ta-Li ore deposit. Analysis of major elements, trace elements and volatiles of albite granite and greisens was carried out by using XRF, ICP-MS and ISE methods in order to investigate granite metallogenesis and further to give assistance for exploring rare metal ore prospective areas in southeastern Hunan Province. The results show that the albite granites and greisens are characterized by high values of SiO2(70.6%~84.85%), Al2O3(9.36%~22.99%), A/CNK>1.0 and F (2.43%~3.74%), large range content of Na2O+K2O (1.51%~7.52%) and CaO 0.1%~3.44%), and extremely low content of Fe2O3, MgO, TiO2, MnO and P2O5, with significant Eu anomalies and m-type tetrad effects. They are strongly enriched in Rb, Th, U, Nb and Ta, but depleted in Ba, Sr and Ti elements. All these characteristics show that these granites were formed through high differentiation of magma and magma immiscibility. It is believed that rare metals enrichment and melt-fluid geochemical behavior and ore-forming effect were attributed to such restrictive functions as volatile F, the unmixing of magma, water-rock reaction and weathering leaching process, which led to rare metals enrichment in albite granites and greisens to form ore deposit. |
| keywords:geochemistry Nb-Ta-Li albite granite greisens F enrichment granite Jianfengling |
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