光谱学与光谱分析, 2020, 40 (5): 1461, 网络出版: 2020-12-09   

便携式XRF仪在胶东曲家金矿岩心地球化学特征研究中的应用

Application of Portable XRF in Core Geochemical Characteristics of Qujia Gold Deposit in Jiaodong Area
作者单位
吉林大学地球探测科学与技术学院, 吉林 长春 130026
摘要
曲家金矿地处胶东地区招远-莱州金成矿带, 是深部地质找矿的新成果, 岩心样品获取不易, 因此采取便携式XRF仪进行测试分析, 便携式XRF仪具有体积较小方便携带、 分析速度比较快和不需要破坏样品三大特点, 可以快速的得到分析结果并且不损失岩心样品。 研究可分为三个方面: 利用岩性相似且拥有准确化学分析数据的冀东岩石样品确定测试曲线并建立数学模型, 再用便携式XRF仪对曲家金矿岩心样品进行测试, 经过校正和补充后得到一批测试数据; 选取部分样品进行粉碎处理并用传统的台式X荧光分析仪进行测试, 并将便携式XRF仪与台式X荧光分析仪的测试结果进行拟合和对比; 利用数据进行曲家金矿地球化学特征分析, 得到曲家金矿岩心元素组成、 元素垂向分布特征及元素共生组合。 结果表明, 便携式XRF仪对岩石样品的测试分析结果准确可靠, 测试误差在允许范围之内, 准确度与传统分析测试技术相比稍逊, 但运用于野外现场进行定性分析和半定量分析完全没有问题。 经数学模型校正与补充的便携式XRF仪测试数据与台式X荧光分析仪的测试数据拟合效果良好, 影响便携式XRF仪测试岩石样品准确度的因素主要是岩石样品成分分布不均一, 岩石样品的粒级越小, 成分越均一, 则测试误差越小。 测试时应该尽量选取成分较为均一的地方, 或者测试前观察手标本, 按照成分比例等权分配测试点位, 并且尽量多次测试取平均值。 利用测试数据进行曲家金矿地球化学研究, 将分析结果与已知地质状况对比, 具有非常高的吻合性, 从另一个角度证实了便携式XRF仪测试数据的可靠性。 岩心样品整体上Si和Al含量较高, 从围岩进入破碎带, K, Ca和S等常量元素及Cu, Pb和Zn等金矿床指示元素均发生富集。 研究结果总体表明便携式XRF仪在曲家金矿中的应用效果良好, 可以进行推广。
Abstract
Qujia Gold Deposit is located in the Zhaoyuan-Laizhou gold metallogenic belt in the Jiaodong area and is a new achievement in deep geological prospecting. Research samples are not easy to obtain, so portable XRF analyzer is used for analysis, Portable XRF analyzer has three features, it is small in size so easy to carry, the analysis speed is fast and does not need to destroy the sample, so the analysis result can be quickly obtained without losing the core sample. The study can be divided into the following three aspects, using the rock samples of Jidong area with similar lithology and accurate chemical analysis data to determine the test curve and establish a mathematical model, and then using the portable XRF analyzer to test the core samples of Qujia Gold Deposit, after calibration and replenishment, a batch of test data is obtained. Some samples are selected for pulverization treatment and tested by an X-ray fluorescence analyzer, and the test results of the portable XRF analyzer and the X-ray fluorescence analyzer are compared. Then using the data to analyze the geochemical characteristics of Qujia Gold Deposit, and the core element composition, element vertical distribution characteristics and element association of Qujia Gold Deposit were obtained. The results show that the portable XRF analyzer has accurate and reliable test results for rock samples, the test error is within the allowable range, the accuracy is less than that of the traditional analytical test technology, but it is completely problem-free to apply qualitative analysis and semi-quantitative analysis to the field. The portable XRF analyzer test data corrected and supplemented by the mathematical model fits well with the test data of the X-ray fluorescence analyzer, the factors affecting the accuracy of the portable XRF analyzer for testing the rock sample are mainly the uneven distribution of the rock sample component, the smaller the level, the more uniform the composition, the smaller the test error. When testing, where the composition is more uniform should be selected, or observe the rock samples before the test, assign the test points according to the proportion of the components, and try to take the average as many times as possible. Using the test data to carry out the geochemical study of Qujia Gold Deposit, the analysis results are in good agreement with the known geological conditions, and the reliability of the portable XRF analyzer test data is confirmed from another angle. The core samples have a higher content of Si and Al, and from the surrounding rock to the fracture zone. The K, Ca, S and other microelements and Cu, Pb, Zn and other indicator elements of gold are all enriched. The results of the study generally indicate that the portable XRF analyzer has a good application effect in Qujia Gold Deposit and can be promoted.

郭金珂, 陆继龙, 尹业长, 赵玉岩, 汤肖丹, 范玉超, 刘洋. 便携式XRF仪在胶东曲家金矿岩心地球化学特征研究中的应用[J]. 光谱学与光谱分析, 2020, 40(5): 1461. GUO Jin-ke, LU Ji-long, YIN Ye-chang, ZHAO Yu-yan, TANG Xiao-dan, FAN Yu-chao, LIU Yang. Application of Portable XRF in Core Geochemical Characteristics of Qujia Gold Deposit in Jiaodong Area[J]. Spectroscopy and Spectral Analysis, 2020, 40(5): 1461.

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