Geochemistry of magnetite and maghemite in soils in European Russia |
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| Authors: | Yu N Vodyanitskii E G Morgun L A Obydenova K A Rumyantseva N V Chapygina |
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| Institution: | (1) Dokuchaev Soil Science Institute, Pyzhevskii per. 7, Moscow, 109017, Russia;(2) Faculty of Soil Science, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia;(3) Izhevsk State Agricultural Academy, ul. Studencheskaya 11, Izhevsk, 426069, Russia;(4) Moscow State Pedagogical University, ul. Kibal’chicha 16, Moscow, 129626, Russia |
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| Abstract: | A method is proposed for determining the proportions of soluble Fe oxides (magnetite, FeOFe2O3, and maghemite, γ-Fe2O3) based on the measured magnetic susceptibility before and after treatment of soil with the Tamm or Mehra-Jackson (DCB) reagents. The development of hydromorphism in steppe soils in Ciscausiaia is associated with an increase in the magnetite fraction and, consequently, the average magnetite: maghemite ratio increases from 0.8–0.9 to 1.1. In these soils, smectites facilitate magnetite oxidation to maghemite. Soddy-podzolic and dark humic soils in the Cis-Ural region are noted for low values of the magnetite: maghemite ratio (0.5 on average) due to maghemite predominance. Soils in the Cis-Ural region on cover red-earth clays inherit lithogenic Fe oxides: hematite and maghemite. Hydromorphism in humid environments in northern taiga is accompanied by a significant increase in the magnetite: maghemite ratio to 4–9. Some issues of Fe geochemistry in magnetite and maghemite are considered. |
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