岩石稀土元素X荧光光谱分析技术及应用

X-Ray Fluorescence Spectrometer Analysis Techniques and Application of Rare-Earth Element in the Rock

稀土元素在岩石中的丰度分布及其聚集迁移的规律和特征,有助于研究岩浆起源、演化和岩石形成的条件等重要岩石学问题。采用粉末压片法制样,用散射线内标法校正元素间的效应,使用PW2400型X射线荧光光谱仪对松辽盆地深层火山岩稀土元素进行测定。稀土元素的特征参数可作为深层地层详细对比的一个很有意义的地球化学标志,不仅可以判断出不同组岩浆所经历的分异程度,还可以判断各层的部分熔融和分离结晶程度。根据不同组的稀土元素丰度分布存在共同之处,可以证实松辽盆地及其边缘深层地层的构造背景。

The rare-earth element is a set of element group which has special significance in petrology research. The distribution of its component in the rock, the regularity and the characteristic of gathering and moving contribute to study the important petrology problems such as magma origin, evolution and the condition of rock formation etc. . In this article, the sample preparation with pressed powder pellet has been developed for the determination of rare-earth element of deep volcanic rocks in Songliao Basin by Philips PW2400 sequential X-ray Fluorescence Spectrometer. The in-terelement effect is corrected using scattered line as internal standard. The characteristic parameter of rare-earth element is explained to be a significant symbol of geochemistry in deep stratigraphic correlation. It is used to determine separating degree of magma in different groups, and also determine partial melting, separating and crystallizing degree of each layer. In addition, according to the common distribution of rare-element component in different groups, the characteristic parameter is explained that deep stratum in Songliao Basin and the edge was formed at a similar structural background.