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Rietveld定量方法在蒸发岩矿物组分分析中的精确度评价和误差来源
Assessment of Accuracy and Error Sources of the Rietveld Quantitative Phase Analysis Method in Mineral Contents of Evaporites

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陈爱清 1   薛雍 2 *   徐洪柳 3   李国武 4  
文摘 Rietveld物相定量分析(RQPA)方法在地质学中已有大量应用,在蒸发岩定量分析中,对精确度的评价和误差控制是提高分析质量的重要因素。本文对人工配制和野外采集的样品(石膏和钾盐)进行RQPA分析,并与化学分析结果对比,评价其精确度并分析其主要的误差来源。结果表明:人工配制的氯化钠-氯化钾二元物相的绝对误差为0.4%~0.9%;氯化钠-氯化钾-碳酸钙三元物相的绝对误差为0.1%~1.2%;二元物相样品10次分析的标准偏差为0.702%,相对标准偏差为1.74%(氯化钾)和1.17%(氯化钠);野外采集的石膏和钾盐样品的RQPA分析结果与化学分析结果具有很好的一致性。表明RQPA方法在蒸发岩矿物组分定量分析中具有较高的精确度,其误差主要来源于样品性质、样品制备、测试条件和精修过程等。RQPA方法具有减弱择优取向效应、无需纯样以及提高数据利用率等优点,与化学分析技术联用在蒸发岩矿产勘探、储量评价以及工业应用中具有广泛的前景。
其他语种文摘 The Rietveld phase quantitative analysis(RQPA)method has been widely applied in geology. In the analysis of evaporite, the evaluation and error control of precision are important factors to improve the quality. The RQPA method was applied to simulated binary mixtures(halite and sylvite), ternary mixtures(halite, sylvite, and calcite), and geological samples(i.e., gypsum and sylvite samples). The contents of each mineral calculated by RQPA were compared with the results of chemical analytical data to evaluate the RQPA's accuracy and the main error sources were analyzed. The results show that the absolute errors between theoretical and calculated values are in the range of 0.4%-0.9% and 0.1%-1.2% for the binary and ternary mixtures, respectively. The mineral contents of geological samples matched very well with the results of the chemical analysis. The standard deviation of binary mixtures is 0.702 for 10 calculated results. The relative standard deviation of the same samples are 1.74%(KCl)and 1.17%(NaCl), respectively. The study indicates that the RQPA method is accurate in the quantitative analysis of mineral contents of evaporite rocks. The error sources arose mainly from the nature of the samples, sample preparation, measuring conditions, and refinement process. Due to the advantages of reducing the preferred orientation, not requiring pure samples, and high utilization of data, the RQPA method has a potentially extensive application in mineral exploration analysis, reserve evaluation, and industries of evaporites, when coupled with the chemical analysis method.
来源 岩矿测试 ,2017,36(4):374-381 【核心库】
DOI 10.15898/j.cnki.11-2131/td.201608020111
关键词 蒸发岩 ; Rietveld物相定量分析 ; 结构精修 ; 钾盐
地址

1. 中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室;;广东省矿物物理与材料研究开发重点实验室, 广东, 广州, 510640  

2. 北京北达燕园微构分析测试中心, 北京, 100084  

3. 湖南省有色地质勘查研究院测试中心, 湖南, 长沙, 410000  

4. 中国地质大学(北京)科学研究院, 北京, 100083

语种 中文
文献类型 研究性论文
ISSN 0254-5357
学科 地质学
文献收藏号 CSCD:6068215

参考文献 共 31 共2页

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引证文献 3

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2 陈爱清 X射线衍射旋转撒样法分析氟金云母多型组成与含量 岩矿测试,2021,40(4):504-511
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