黎塘岩溶区土壤铁锰结核的地球化学特征研究  

Study on the geochemical properties of Fe-Mn nodule in Litang karst area

作　　者：苏春田[1] 唐健生[1] 单海平[1] 陈宏峰[1] 夏日元[1] 邹胜章[1] 

机构地区：[1]中国地质科学院岩溶地质研究所

出　　处：《中国岩溶》2008年第1期43-49,共7页Carsologica Sinica

基　　金：广西科学基金资助项目(编号:桂科基0639066);中国地质调查项目(1212010634803)

摘　　要：对黎塘岩溶区土壤铁锰结核的地球化学特征研究表明:与土壤相比,铁锰结核的化学组成中仍以SiO2、Al2O3和Fe2O3为主,但Fe2O3的含量明显增加,成为铁锰结核中含量最多的氧化物,MnO含量也有一定程度增加,它们富集系数分别为5.19和3.40;铁锰结核对重金属具有明显的富集效应,其富集顺序为Cr()>Pb>Co>Zn>Ni>Ba>Li,它在土壤中的含量受成土母质及浅层地下水活动的影响。元素的相关分析及因子分析表明,铁锰结核在形成过程中还具有成核富集效应、专性吸附效应和成核易淋溶效应。In this paper, the geochemistry properties of Fe-Mn nodule are studied in Litang karst area. Compared with corresponding soils, SiOz, Al2O3 and Fe2O3 are still the main elements in the Fe-Mn nodule. However, the Fe2O3 content increases significantly and is the most in the oxides, meanwhile the MnO content increases to some extent with the enrichment coefficients being 5.19 and 3. 40. The Fe-Mn nodule enriches heavy metal elements, the enrichment order of some heavy metals is Cr（ Ⅵ ）〉Pb〉Co〉Zn〉Ni〉Ba〉 Li. The Fe-Mn content in the soil is affected by parent rock of the soil and shallow groundwater. By correlation matrix analysis and factor analysis, it is proved that there are the nucleation and enrichment effect, the specific adsorption effect and the leaching effect.

关 键 词：岩溶 土壤 铁锰结核 地球化学 黎塘 

分 类 号：P59[天文地球—地球化学]