贵州戈塘金矿萤石微量元素特征及钐—钕测年

doi:10.11867/j.issn.1001-8166.2012.10.1087

地球科学进展 doi: 10.11867/j.issn.1001-8166.2012.10.1087

黄建国 ^1,2，李虎杰 ¹，李文杰 ¹，董磊 ¹

1.西南科技大学环境与资源学院,四川绵阳 621010；2.贵州大学资源与环境工程学院,贵州贵阳 550003

收稿日期:2012-07-24 修回日期:2012-08-17 出版日期:2012-10-10
基金资助:
全国危机矿山接替资源找矿项目“西南地区层控型多金属矿床成矿规律总结”（编号：20089943）资助.

Trace Element Characteristics of Fluorite and Its Sm-Nd Isotopic Dating in Getang Gold Deposit, Guizhou Province

Huang Jianguo ^1,2, Li Hujie ¹, Li Wenjie ¹, Dong Lei ¹

1.College of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
2.College of Resource and Environment Engineering, Guizhou University, Guiyang 550003, China)

Received:2012-07-24 Revised:2012-08-17 Online:2012-10-10 Published:2012-10-10

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对与戈塘金矿共生的萤石微量元素特征研究表明：萤石中Mo，W，As，Cd，Bi等高温元素含量均高于地壳值，V，Cr，Cu，Cs，Th，Mo，Ga和Ge等元素变异系数大，活化能力强。萤石的稀土总量很低，仅为10.299×10^-6～17.455×10^-6，明显富集重稀土（LREE/HREE为0.48～0.69），并具有Eu和Ce的负异常（δEu为0.71～0.91，δCe为0.62～0.78），Tb/CaTb/La图解显示萤石为热液成因且为热液的晚期阶段。萤石的Rb/Sr比值和初始⁸⁷Sr/⁸⁶Sr比值均与地幔值较为接近，反映出其成矿流体主要来源于上地幔或（岩浆）深部。萤石的形成经历了长期演化的热液活动，成矿温度较低（<200°～250°），成矿年龄为（35.83±0.37）Ma（Sm-Nd等时线年龄）。

关键词: 戈塘金矿, 脉石矿物, 萤石, 微量元素, Sm-Nd年龄

Trace element characteristics of symbiotic fluorite with Getang gold deposit have shown that: Its high-temperature element (including Mo, W, As, Cd, Bi, etc.) have higher contents than the crustal values. Those elements (including V, Cr, Cu, Cs, Th, Mo, Ga, Ge, etc.) have bigger coefficient of variation and strong activation energy. Fluorite’s total REE is low, only 10.299×10^-6~17.455×10^-6, and enrichment of heavy rare earth is obvious (LREE/HREE is 0.48-0.69), and have negative anomalies of Eu and Ce (δEu=0.71-0.91，δCe=0.62-0.78). The Tb/Ca vs. Tb/La diagram shows that fluorite is hydrothermal and is in its late stage. Rb/Sr ratios of fluorite and its initial ⁸⁷Sr/⁸⁶Sr ratios are closer to the mantle value, which reflect that its ore-forming fluids are from the upper mantle or (magma) deep. The formation of fluorite experienced a long-term evolution of the hydrothermal activity, lower ore-forming temperature (<200°~250°), and mineralization age is 35.83±0.37 Ma (Sm-Nd isochron age)

Key words: Getang gold deposit, Gangue mineral, Fluorite, Trace elements, Sm-Nd age

中图分类号:

P619.21+5

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