Magnetic imprints of pedogenesis in Planosols and Stagnic Alisol from Bulgaria

摘要: Iron in its diverse forms soils is an important indicator of a number past and/or ongoing environmental processes. oxide mineralogy pertinent to particular soil type could be obtained with high resolution using magnetic methods. Planosols are characterized by surface water-logging leading development great textural differentiation depth. This study presents investigation on three and Stagnic Alisol from Bulgaria combined conventional chemical extraction methods (oxalate, citrate–dithionite) property characterization (pH, grain size fractions, organic carbon content). Extensive analyses high-resolution sampled depth profiles have been done for determination iron (oxyhydr)oxide minerals, their stability variations effective Zones intensive oxides dissolution – the topmost horizons magnetically depleted content strongly but paramagnetic detected through ratio χ77/χ293 enhanced accordingly. Bleached eluvial horizons, however, contain stable crystalline magnetite/maghemite fraction, albeit trace amounts. We ascribe this processes lessivage translocation humus horizon. The main results suggest that thin enriched pedogenic maghemite. Thermal behavior susceptibility suggests ferrihydrite present all profiles. In illuvial common mineral lepidocrocite, while — Al-substituted hematite. both poorly well oxides. Increasing precipitation weathering leads higher proportion phases profile.