大兴安岭北段阿里河地区1:5万土壤地球化学不同粒级样品对比研究

A Comparative Study of 1:50,000 Soil Geochemical Samples of Different Grain Sizes in Ali River Region, Northern Part of the Greater Khingan Mountains

摘要: 在大兴安岭森林沼泽景观区，采用A、B两组不同样品粒级对照分析方式，研究1:5万土壤地球化学测量−10目和−10~+60目的两组样品中各元素在地球化学特征参数、元素组合以及地球化学异常圈定存在的差异。结果表明，除Cd、Cr、Ni等元素稍受粒级影响，A、B两组样品中大部分元素的地球化学参数无明显差别；元素分组受粒级影响较小，各元素组合所指示意义基本相当；Ag、Mo、Ni、Pb四种元素的异常圈定受A、B两组样品不同粒级的影响较为明显，可能是由于A组样品中含有较多富含有机质的细粒粘土引起。

Abstract: In the forest and swamp landscape area of the Greater Khingan Mountains, the difference in geochemical characteristic parameter, element combination and geochemical anomaly deline-ation of each element in the samples of −10 mesh and −10~+60 mesh in 1:50,000 soil geochem-ical survey was studied by using the control analysis method of grain size of groups A and B of different samples. The results showed that the geochemical parameters of most elements in groups A and B were not significantly different, except that Cd, Cr and Ni were slightly affected by grain size; the element grouping was less affected by the grain size, and the indicated mean-ing of each element combination was basically the same; the abnormal delineation of Ag, Mo, Ni and Pb was significantly affected by the different grain sizes of the samples in group A and B, which may be caused by the fact that the samples in group A contained a lot of fine clay rich in organic matter.