矿源层地球化学元素在黄土盖层中纵向分布的趋势提取与应用

Extraction and Applications of the Long-Term Vertical Distribution Trends of Geochemical Elements in the Loess Cover

在内蒙草原覆盖区迪彦钦阿木Mo-Ag矿床长度为106.5m黄土覆盖层垂直岩心上等间距顺序取样106个,用Niton XL3t X-荧光仪测得每个样本的33个元素的含量.在正态性检验的基础上,用Kendallτ相关系数分析了元素含量与深度的相关性,得出黄土覆盖层中Mo、S、W、Te、Fe、Cu、Ni、Mn、Sb、Rb、Cs、Sn、Zn、Ti、V、Pb、Th、As这18种元素含量与离开矿源的距离具有显著相关性;用HP滤波法分离出这18种元素含量空间序列的长期趋势,并用变量聚类分析法对长期趋势进行了分类;用因子分析法得到了迪彦钦阿木矿床Mo-W成矿因子和Pb-Zn成矿因子,并模拟得到Mo-W成矿因子的指数分布模式.本文的研究思路与结论可为覆盖区表层地球化学异常对矿产预测的指示作用研究提供借鉴.

106 samples were sequentially collected from a 106.5 mvertical core of the loess cover on the Diyanqinamu Mo-Ag deposit in the grassland area in the Inner Mongolia.The contents of 33 elements were measured by Niton XL3t X-ray fluorescence analyzer.After the normality test,the correlation between the contents of elements and the depth were analyzed by Kendallτ correlation coefficient method,which shows that the contents of 18 elements Mo,S,W,Te,Fe,Cu,Ni,Mn,Sb,Rb,Cs,Sn,Zn,Ti,V,Pb,Th and As from the loess cover are statistically correlated with the distances from the ore source.The long-term trends of the 18 elements were detached from the content spatial series,which were classified into several clusters.Ore-forming factors Mo-W factor and Pb-Zn factor were obtained by factor analysis,and the exponent transportation modes of the Mo-W factor were simulated.The research approach and results of this paper could be useful references for evaluating mineral resources of covered areas from the surface geochemical anomalies.