浅覆盖区土壤化学成分与基岩化学成分的关系及其意义——以大兴安岭北部地区为例

Relation between the chemical compositions of residual soils and bedrocks in shallow overburden areas and its significance-a case study of the northern Da Hinggan Mountains

以大兴安岭北部地区为例,研究了浅覆盖区土壤与基岩化学成分的关系。指出浅覆盖区残积型土壤主要造岩元素组合继承了基岩元素组合特征;在岩石风化成土过程中,元素再分配和迁移使土壤中大多数元素(氧化物)含量产生明显的“均一化”。在此基础上,对土壤地球化学异常的识别与评价问题进行了讨论并提出了建议。

Taking the northern Da Hinggan Mountains for example, the relation between the chemical compositions of soils and bedrocks in shallow overburden areas is studied. The study indicates that the major rock-forming elements in residual soils in shallow overburden areas have the inherited characteristics of the element assemblage of the bedrocks, and that the redistribution and migration of elements in the processes of rock weathering and soil formation result in the homogenization of the contents of most elements （oxides） in soils. Based on the study, the problems about the recognition and appraisal of geochemical anomalies of residual soils are discussed and proposals are advanced in this paper。