沉积岩中粘土矿物定量分析的研究

扫描电镜(SEM)与X射线能量色散分析(EDX)联用,可获得粘土矿物微区成分和全样平均成分,并求出样品中的矿物含量,实验采用纯矿物人工配比组合样,进行SEM/EDX条件试验,矿物定量的相对误差小于5%.为考察该方法的实用性,做了湖南风化型矿石海泡石定量,还对安徽嘉山和江苏金层凹凸棒石进行矿物定量,均得到满意的结果,为了解矿区矿物组合特点和评价粘土矿床提供了依据.

The Study of Quantitative Analysis Method of Clay Minerals in Sedimentary Rock

The identification and quantitative determination of clay minerals is an important work for evaluating the ore-deposit of clay and studying the distribution of estuary and coastle sediments and the reservoir of iol field The combination of SEM (Scanning Electron Microscopy) and EDX (Energy dispersive analysis of X-ray) is used to analyse samples, by which, the micro-area compositions of clay minerals and the average compositions of whole-sample can be got.The mineral contents of sample can be calculated by advanced computer program which can be made by this apparatus.The samples used in condition fest of SEM / EDX are the assemblage of refined clay minerals with various proportion and relative error of experiment is less than 5%. In order to check the practicality of this method, the quantitative analysis of the weathering sepiolite from Hunan province and the attapulgite from Jiashan in Anhui province and Jintan in Jiangsu province are made. All results are satisfying. Such, this method can be used to provide evidents for recognizing combinatory character of minerals in mining-area and evaluating ore-deposit of clay.