华中地区几种土壤铁锰胶膜及其基质中某些元素的地球化学特点

Geochemical characteristics of some elements in iron manganese cutan and matrix of some soils in the central China

通过对华中地区几种土壤和胶膜中某些性质及元素的相关分析和因子分析,比较了铁锰胶膜和基质土壤的性质及元素含量之间的关系。研究表明,(1)铁锰胶膜的pH值、粘粒含量、K2O、Na2O、MnO2、非晶质铁、铁的活化度、微量元素等的含量均比基质土壤的高,且差异显著;(2)铁锰胶膜富集重金属元素,Co、Ni、Cu和Zn等元素主要富集于胶膜的氧化锰矿物中,而Pb主要富集在氧化铁矿物中;(3)Mg在铁锰胶膜的形成过程中进一步淋溶,以致含量减少。

The geochemical characteristics of some elements in iron manganese cutans of the central China are determined and compared with matrix soils. Correlation matrix analysis and factor analysis are conducted. The results show that the pH and contents of clay, K2O, Na2O, CaO, MnO2, FeO, Fed, FeO/Fed, Co, Ni, Cu, Pb, Li and Zn in cutans are notable higher than those in corresponding matrix soils. Iron manganese cutans enrich heavy metal elements. Co, Ni, Li, Cu andZn are enriched in manganese minerals of cutans, and Pb mainly exists in iron minerals of cutans. During the formation of iron manganese cutans, Mg was leached, so its content in cutans is lower than that in matrix soils.