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Iron and manganese minerals in concretions in soddy-podzolic soils of different degree of gleyfication derived from different parent materials



Iron and manganese minerals in concretions in soddy-podzolic soils of different degree of gleyfication derived from different parent materials



Vestnik Moskovskogo Universiteta Seriya 17 Pochvovedenie (3): 3-12, July-September



The proportion of iron oxides and hydrooxides in concretions is largely controlled by the mineralogical composition of the parent material. In podzolic soils derived from parent rock low in Fe and Ti (loess-like loams and clays) hydroxides were found to dominate: Mn-feroxyghite, ferrihydrite, goethite. In similar soils derived from bandy and Permian clays rich in Fe and Ti oxides both hydroxides and inherited Fe and Ti oxides are found: magnetite, gematite, ilmenite, anatase and rutile. Manganese-bearing minerals in concretions are represented by vernadite. In automorphous soils hydrooxides in concretions are believed to be largely of biological origin. With the increase of the degree of gleyfication the contribution of chemical synthesis of hydroxides (Al-geothite) increases.

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