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An investigation into heterogeneity in a single vein-type uranium ore deposit: Implications for nuclear forensics

机译：单静脉型铀矿床异质性研究：对核法证学的启示

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摘要

Minor element composition and rare earth element (REE) concentrations in nuclear materials are important as they are used within the field of nuclear forensics as an indicator of sample origin. However recent studies into uranium ores and uranium ore concentrates (UOCs) have shown significant elemental and isotopic heterogeneity from a single mine site such that some sites have shown higher variation within the mine site than that seen between multiple sites. The elemental composition of both uranium and gangue minerals within ore samples taken along a single mineral vein in South West England have been measured and reported here. The analysis of the samples was undertaken to determine the extent of the localised variation in key elements. Energy Dispersive X-ray spectroscopy (EDS) was used to analyse the gangue mineralogy and measure major element composition. Minor element composition and rare earth element (REE) concentrations were measured by Electron Probe Microanalysis (EPMA). The results confirm that a number of key elements, REE concentrations and patterns used for origin location do show significant variation within mine. Furthermore significant variation is also visible on a meter scale. In addition three separate uranium phases were identified within the vein which indicates multiple uranium mineralisation events. In light of these localised elemental variations it is recommended that representative sampling for an area is undertaken prior to establishing the REE pattern that may be used to identify the originating mine for an unknown ore sample and prior to investigating impact of ore processing on any arising REE patterns. (C) 2015 Elsevier Ltd. All rights reserved.
机译：核材料中的微量元素组成和稀土元素（REE）浓度非常重要，因为它们在核法证学领域用作样本来源的指标。但是，最近对铀矿和铀矿精矿（UOCs）的研究表明，单个矿场存在明显的元素和同位素异质性，因此，某些矿场在矿场内的变异高于多个矿场之间的变异。在英格兰西南部沿单一矿脉采集的矿石样品中，铀和脉石矿物的元素组成已得到测量和报告。进行样品分析以确定关键元素的局部变化程度。能量色散X射线光谱（EDS）用于分析脉石矿物学和测量主要元素组成。微量元素组成和稀土元素（REE）浓度通过电子探针微分析（EPMA）测量。结果证实，用于矿床定位的许多关键元素，稀土元素浓度和模式确实显示出矿山内部的显着变化。此外，在仪表刻度上也可以看到明显的变化。另外，在静脉内鉴定出三个独立的铀相，表明存在多个铀矿化事件。鉴于这些局部元素变化，建议在建立可用于识别未知矿石样品的矿山的REE模式之前，以及在调查矿石加工对任何产生的REE的影响之前，对区域进行代表性采样。模式。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Environmental Radioactivity》 |2015年第12期|75-85|共11页
  • 作者

    Keatley A. C.; Scott T. B.; Davis S.; Jones C. P.; Turner P.;

  • 作者单位

    Univ Bristol, HH Wills Phys Lab, Interface Anal Ctr, Bristol BS8 1TL, Avon, England|Bristol Oxford Nucl Res Ctr, Oxford, England;

    Univ Bristol, HH Wills Phys Lab, Interface Anal Ctr, Bristol BS8 1TL, Avon, England|Bristol Oxford Nucl Res Ctr, Oxford, England;

    AWE, Reading RG7 4PR, Berks, England;

    Univ Bristol, HH Wills Phys Lab, Interface Anal Ctr, Bristol BS8 1TL, Avon, England|Bristol Oxford Nucl Res Ctr, Oxford, England;

    Univ Bristol, Sch Chem, Bristol BS8 1TS, Avon, England|Bristol Oxford Nucl Res Ctr, Oxford, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nuclear forensics; Heterogeneity; REE patterns; Uranium ores;

    机译：核法证学;非均质性;REE模式;铀矿;

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