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幕阜山南缘仁里稀有金属矿区7号伟晶岩脉、辉石闪长岩脉特征及地质意义
Characteristics of No.7 Pegmatite Vein and Pyroxene Diorite in Renli Rare Metal Deposit, South Margin of Mufushan Batholiths and its Geological Implications

陈剑锋 ^1,2,3 文春华 ² ^* 黄建中 ² 张锦煦 ² 汪程 ³ 唐勇 ⁴ 吕正航 ⁴ 周芳春 ⁵ 陈虎 ⁵ 曹创华 ² 陈宇鹏 ²

文摘	位于湖南幕阜山南缘的仁里稀有金属矿床是国内近年新发现的超大型伟晶岩型铌钽矿床。针对矿区内二云母伟晶岩的形成年龄、物质来源以及伟晶岩与花岗岩之间的关系等科学问题,选择对仁里矿区最具典型特征的7号伟晶岩脉以及内部的辉石闪长岩脉进行LA-ICP-MS锆石U-Pb定年和Hf同位素分析,以及岩石地球化学测试。结果显示,仁里矿区7号伟晶岩脉和辉石闪长岩脉的锆石U-Pb年龄分别为141.5±0.8 Ma和137.2±0.6 Ma,均形成于早白垩世;综合伟晶岩、辉石闪长岩锆石ε_(Hf)(t)值和二阶段模式年龄(t_(DM2))相近的特征,以及辉石闪长岩中稀有金属元素丰度很高,且富集不相容元素Rb、U、Nd和明显亏损Ba、Nb、Sr、P、Ti等特征,认为矿区伟晶岩的成岩、成矿物源主要为地壳的部分熔融。伟晶岩与花岗岩在时空上的关系以及Hf同位素特征等显示矿区二云母伟晶岩的母岩为黑云母二长花岗岩。
其他语种文摘	The Renli rare metal deposit, located at the southern margin of Mufushan batholith, is a newly discovered super-large sized granitic pegmatite type Nb-Ta deposit. In this study, we report the LA-ICP-MS zircon U-Pb dating results and Hf isotope compositions of the No.7 pegmatite vein and the pyroxene diorite, as well as the major and trace element concentrations of the pyroxene diorite, and discuss the formation age and magma source of the two-mica pegmatite veins as well as the relationship between the pegmatite and the granite. The LA-ICP-MS zircon U-Pb analysis yielded ~(206)Pb/238U ages of 141.5±0.8 Ma and 137.2±0.6 Ma for the No.7 pegmatite vein and the pyroxene diorite respectively, suggesting that both of them formed in the Early Cretaceous. The No.7 pegmatite vein and the pyroxene diorite have similar ε_(Hf)(t) values and two-stage model ages(t_(DM2)). Geochemically, the pyroxene diorite is characterized by high rare metal element concentrations, depleted in Ba, Nb, Sr, P, Ti and enriched in Rb, U, Nd, which indicates that the primary magma of the pegmatite and ore-forming materials in the Renli deposit are likely derived from the Proterozoic crust. The close spatio-temporal relationship between the pegmatite and the granites, as well as their similar zircon Hf isotope compositions show that the two mica pegmatite veins and the biotite monzogranite in Renli are co-magmatic in origin.
来源	大地构造与成矿学 ,2022,46(5):951-967 【核心库】
DOI	10.16539/j.ddgzyckx.2021.05.018
关键词	锆石U-Pb定年 ; Hf同位素组成 ; 地球化学特征 ; 伟晶岩脉 ; 辉石闪长岩 ; 仁里矿区
地址	1. 湖南省煤炭地质勘查院, 湖南, 长沙, 410114 2. 湖南省地质调查所, 湖南, 长沙, 410116 3. 中南大学, 有色金属成矿预测与地质环境监测教育部重点实验室, 湖南, 长沙, 410083 4. 中国科学院地球化学研究所, 贵州, 贵阳, 550081 5. 湖南省核工业地质局三一一大队, 湖南, 长沙, 410100
语种	中文
文献类型	研究性论文
ISSN	1001-1552
学科	地质学
基金	湖南省重点领域研发计划资助项目 ; 国家重点研发计划资助项目 ; 湖南省自然科学基金 ; 湖南省专项科普专题 ; 有色金属成矿预测与地质环境监测教育部重点实验室基金
文献收藏号	CSCD:7335518

参考文献共 76 共4页

引证文献 3 篇

1 王猛湘北仁里花岗伟晶岩型稀有金属矿床红外光谱特征研究及勘查应用岩石学报,2023,39(7):2101-2116
CSCD被引 4 次

2 成永生湘东北传梓源206号伟晶岩脉地球化学、锆石U-Pb年代学和Hf同位素组成及其地质意义中南大学学报. 自然科学版,2023,54(7):2739-2757
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幕阜山南缘仁里稀有金属矿区7号伟晶岩脉、辉石闪长岩脉特征及地质意义 Characteristics of No.7 Pegmatite Vein and Pyroxene Diorite in Renli Rare Metal Deposit, South Margin of Mufushan Batholiths and its Geological Implications

幕阜山南缘仁里稀有金属矿区7号伟晶岩脉、辉石闪长岩脉特征及地质意义
Characteristics of No.7 Pegmatite Vein and Pyroxene Diorite in Renli Rare Metal Deposit, South Margin of Mufushan Batholiths and its Geological Implications