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Elemental Composition and Geochemical Characteristics of Iron-Manganese Nodules in Main Soils of China

机译：中国主要土壤中铁锰结核的元素组成和地球化学特征

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摘要

Elemental composition and geochemical characteristics of iron-manganese nodules from nine main soils in China were studied by chemical and multivariate statistical analyses to better understand the reactions and functions of ironmanganese nodules in soils and sediment. Compared to the corresponding soils, Mn, Ba, Cd, Co and Pb had strong accumulation, Ni had moderate accumulation, while Ca, Cu, Fe, Na, P, Sr and Zn accumulated to a minor degree in the iron-manganese nodules. In contrast, Si, Al, K, Mg and Ti were reduced in the iron-manganese nodules. The contents of Ba, Cd, Co, Cu, Ni, Pb and Zn were positively and significantly correlated with that of MnO2 in the iron-manganese nodules, while the contents of Cr, Cu, Ni, Pb and Zn were positively and significantly correlated with that of Fe2O3 in soils. Based on a principle component analysis, the elements of iron-manganese nodules were divided into four groups: 1)Mn, Ba, Cd, Co, Cu, Li, Ni, Pb and Zn that were associated with Mn oxides, 2) Fe, Cr and P that were associated with Fe oxides, 3) Si, K, and Mg that were included in the elemental composition of phyllosilicate, and 4) Ca, Na, Al and Ti that existed in todorokite, birnessite, lithiophorite and phyllosilicate. It was suggested that accumulation, mineralization and specific adsorption were involved in the formation processes of soil iron-manganese nodules.
机译：通过化学和多元统计分析研究了中国9种主要土壤中铁锰结核的元素组成和地球化学特征，以更好地了解土壤和沉积物中铁锰结核的反应和功能。与相应的土壤相比，铁锰结核中Mn，Ba，Cd，Co，Pb的积累量较大，Ni的积累量中等，而Ca，Cu，Fe，Na，P，Sr和Zn的积累量较小。相反，铁锰结核中的Si，Al，K，Mg和Ti减少了。铁锰结核中Ba，Cd，Co，Cu，Ni，Pb和Zn的含量与MnO2呈显着正相关，而Cr，Cu，Ni，Pb和Zn的含量呈正相关和显着。与土壤中的Fe2O3根据主成分分析，将铁锰结核的元素分为四类：1）与锰氧化物相关的锰，钡，镉，钴，铜，锂，镍，铅和锌; 2）铁;与Fe氧化物相关的Cr和P，3）包含在层状硅酸盐元素组成中的Si，K和Mg，以及4）钙锰铁矿，水钠锰矿，硫代磷灰石和层状硅酸盐中存在的Ca，Na，Al和Ti。提示土壤铁锰结核的形成过程涉及积累，矿化和特异吸附。

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