稀土元素地球化学对湘东大富岭矿床铀成矿的指示意义
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1.东华理工大学;2.核工业二三〇研究所

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P59

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中国核工业地质局(2023-24-1;2023-24-3)


Geochemical characteristics of REE as indicators for uranium metallogenesis in the Dafuling deposit in eastern Hunan Province
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East China University of Technology

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    摘要:

    沥青铀矿;LA-ICP-MS;稀土元素;热液脉型铀矿床;大富岭矿床;明月峰矿田

    Abstract:

    Dafuling deposit, a part of the Mingyuefeng ore field in eastern Hunan Province, China, is a typical perigranitic uranium deposit discovered recently. The ore-mineral characteristics and rare earth element features of this deposit have not yet been reported. In order to further elucidate the ore-mineral characteristics and the features of REE, and explore their indicative significance for uranium metallogenesis. Herein, uraninite, the primary ore mineral in the deposit, was investigated via scanning electron microscopy and electron probe microanalysis. Additionally, laser ablation–inductively coupled plasma–mass spectrometry was used for the first time to determine the in situ the REE characteristics of uraninite. Uraninite mainly comprises UO2, CaO, and PbO with a low ThO2 content. Uraninite exhibits a low total content of REEs with a distinct fractionation between light and heavy rare-earth elements while displaying a negative Eu anomaly. The (La/Yb)N is much higher than 1, indicating that light rare-earth elements is obviously enriched.The presence of major elements and REE in uraninite suggests its formation within a hydrothermal environment at moderate to low temperatures below 350°C, thereby classifying the Dafuling deposit as a typical hydrothermal vein–type uranium deposit. REE indicate that the metallogenic hydrothermal fluid changed from high salinity to low salinity, and the hydrothermal environment gradually changed from reduction environment to weak oxidation environment, suggesting that the metallogenic hydrothermal fluid originates from deep crust or has mantle source characteristics.

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范鹏飞,廖志权,李满根,等. 稀土元素地球化学对湘东大富岭矿床铀成矿的指示意义[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-25
  • 最后修改日期:2024-05-23
  • 录用日期:2024-06-05
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