便携式X射线荧光分析仪(PXRF)野外现场测试在岩石样品分析中的应用研究  

Application of portable XRF ectopic detection method in rock sample analysis

作　　者：李蝶 邹灏[1,2] 蒋修未 李阳 刘行[1] LI Die;ZOU Hao;JIANG Xiuwei;LI Yang;LIU Hang(School of Geoscience,Chengdu University of Technology,Chengdu 610059,China;Key laboratory of Tectonic Mineralization and Accumulation,Ministry of Land and Resources,Chengdu 610059,China)

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]自然资源部构造成矿成藏重点实验室,成都610059

出　　处：《物探化探计算技术》2021年第1期126-138,共13页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(41702108);四川省教育厅科研项目(2018CZ0009);中国博士后面上基金(2019M650833)。

摘　　要：以X射线荧光光谱分析技术(XRF)为基准,对那阿地区的花岗岩和变质岩样品进行测试分析。以实验室所测得的主量元素结果为标准,将PXRF所测得的粉末状岩石样品数据与其对比。在处理样品中Al2O3、CaO、Fe2O3、MgO、SiO2、TiO2这六个主量元素的数据时,发现Spearman方法优于Pearson方法。根据不同时间变量下XRF与PXRF所测样品相关系数值(ρ)来看,90 s是4个时间点(90 s、80 s、70 s、60 s)中最优的时间点;以90 s为基准,对比变质岩与花岗岩的相关数据发现:除CaO、MgO的变质岩ρ值大于其花岗岩ρ值之外,其余主量元素的变质岩的ρ值均小于花岗岩的ρ值,在变质岩中除了SiO2、TiO2不具有明显的正相关与负相关性外,其余主量元素均可以进行半定量甚至是定量测量。在花岗岩中除SiO2具有弱正相关性外,其余主量元素的正相关性均显著,因此在样品为粉末态的前提下PXRF的野外现场测试具有可行性。Granite and metamorphic rock samples from the Na'a region were tested and analyzed using X-ray fluorescence spectroscopy(XRF)as a baseline.The data of powdery rock samples measured by PXRF were compared with the results of principal elements measured in the laboratory.When processing the data of Al2O3,CaO,Fe2O3,MgO,SiO2 and TiO2,Spearman method was found to be better than Pearson method.According to the value of the phase relation between XRF and PXRF under different time variables,90S is the optimal time point in 4 time points(90S,80S,70S,60S).In the 90 s as a benchmark,metamorphic rock and granite related data and comparison:in addition to CaO and MgO style of metamorphic rock rho value is greater than the value of granite rho,besides,the rest of the metamorphic rocks of the main elements of rho values are less than the rho value of granite,except SiO2,TiO2 in metamorphic rock has obvious positive correlation,negative correlation with the rest of the main elements are permitted to semi-quantitative or even quantitative measurement.In granite,except for the weak positive correlation of SiO2,the positive correlation of other major elements is significant.Therefore,under the premise that the sample is in powder state,the ectopic detection method of PXRF is feasible.

关 键 词：X射线荧光分析 相关系数 测试时间 岩石样品 野外现场测试 

分 类 号：P631.4[天文地球—地质矿产勘探]