X射线荧光光谱分析技术在片麻岩鉴定中的应用

Application of X-ray Fluorescence Spectrometry in the Identification of Gneiss

以往很少用沉积岩和变质岩的全岩化学成分分析数据对岩石矿物鉴定结果加以验证,本次研究拟对片麻岩不同岩类样品主量元素进行分析,讨论片麻岩主要化学成分对片麻岩分类命名的作用。实验利用X射线荧光光谱仪,通过建立元素测量条件、硅酸盐系列曲线方程参数,利用熔片法,对32件片麻岩样品进行全岩化学成分分析。统计结果显示:随着片麻岩中长英质含量增加,片麻岩的挥发系数有逐渐变小的趋势;随着片麻岩中角闪石、辉石、绿帘石和黑云母含量减少,片麻岩的颜色系数有逐渐变小的趋势,片麻岩中角闪石含量与岩石的颜色系数呈正比关系。

In the past,the results of rock mineral identification were seldom verified by the whole rock chemical composition analysis data of sedimentary rocks and metamorphic rocks.In this study,the main quantitative elements of different gneiss samples were analyzed.The chemical constituents of 32 gneiss samples were analyzed by means of X-Ray fluorescence spectrometer,the element measurement conditions and the silicate series curve equation parameters were determined.The results showed that the volatilization coefficient of gneiss decreased with the increase of felsic content in the gneiss.With the decrease of amphibole,pyroxene,chlorite and biotite in the gneiss,the color coefficient of gneiss decreased gradually.