| 李昌元,向涛,闫友谊,汪程.湘东北传梓源铌钽锂矿床地质地球化学特征及成因[J].矿产勘查,2019,(12):2953-2963 |
| 湘东北传梓源铌钽锂矿床地质地球化学特征及成因 |
| Geogeochemical characteristics and ore genesis of the Chuanziyuan niobium(Ni)-tantalum(Ta)-lithium(Li) deposit in northeast Hunan |
| 投稿时间：2019-07-29 |
| DOI： |
| 中文关键词: 稀有金属 伟晶岩 微量元素 稀土元素 传梓源 湘东北 |
| 英文关键词: rare metal,pegmatite,trace elements,rare earth elements,Chuanziyuan, northeast Hunan Province |
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| 中文摘要: |
| 平江传梓源铌钽锂稀有金属矿床位于幕阜山岩体南西缘,大地构造位置位于扬子板块东南缘江南造山带中段。文章通过铌钽锂矿石的微量元素和稀土元素的组成及其空间上的演化规律,探讨铌钽锂的成矿作用过程,进一步探讨该矿床的矿床成因。自北至南,传梓源铌钽锂稀有金属矿区依次出现幕阜山岩体→微斜长石伟晶岩→微斜长石—钠长石伟晶岩→钠长石伟晶岩→含铌钽的钠长石—锂辉石伟晶岩。该区含矿伟晶岩与幕阜山早期黑云母二长花岗岩的微量元素和稀土元素分布基本一致,表明该区伟晶岩为幕阜山花岗质岩浆结晶演化的产物。对比4种不同类型的伟晶岩发现,Sr元素含量与Nb、Ta的含量呈正相关。微斜长石伟晶岩至钠长石伟晶岩均呈现铕负异常,而含铌钽的钠长石—锂辉石伟晶岩却呈现铕正异常,这可能与富含铌、钽、锂的碱质气水热液叠加自交代(钠化)相关。该区各类型伟晶岩是幕阜山花岗质岩浆结晶分异后期的产物,在伟晶岩原结晶阶段时Nb、Ta等成矿物质发生初步富集,而含铌钽的钠长石-锂辉石伟晶岩可能为富含铌、钽、锂的碱质气水热液叠加自交代的结果。 |
| 英文摘要: |
| The Huanziyuan niobium-tantalum-lithium rare metal deposit is located in the southwestern margin of the Mufushan rock mass, and the tectonic location is in the middle section of the Jiangnan orogenic belt. This work discussed the Ni-Ta-Li mineralization process and ore genesis of this deposit by studying the composition of trace elements and rare earth elements and their spatial evolution rules. From the north to the south, there appears successively Mufushan rock mass → microplagioclase pegmatite → microplagioclase-albite pegmatite → albite pegmatite → albite-spodumene pegmatite containing niobium tantalum. The distribution of trace elements and rare earth elements of pegmatite in this area is consistent with that of biotite monzonite of Mufushan intrusions, which indicates that pegmatite is the product of magmatic crystal evolution of Mufushan granitic magma. By comparing four different types of pegmatites, it was found that Sr content was positively correlated with Nb and Ta contents. From microplagioclase pegmatite to albite pegmatite all presented negative Eu anomalies, while the sodium feldspar-lithium pyroxene pegmatite containing niobium tantalum presented positive Eu anomalies, which may be related to the superposition of alkali gas-hydrothermal fluid rich in niobium, tantalum and lithium with self-metasomatism. The pegmatites are the products of the late crystallization differentiation of the Mufushan granitic magma. In the primary crystallization stage of pegmatite, Nb, Ta and other ore-forming materials were preliminarily enriched, while the Nb-Ta-bearing albite-lithium pyroxene pegmatite may be the result of self-metasomatism by superposition of alkali gas-water-hydrothermal fluids rich in niobium, tantalum and lithium. |
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