Mineralogical Composition of Particle-Size Fractions of Solonetzes from the North Crimean Lowland
| Autor: | E. S. Chechetko, E. B. Varlamov, N. P. Chizhikova, G. E. Tronza, N. B. Khitrov, S. A. Kol’tsov, N. A. Churilin |
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| Rok vydání: | 2017 |
| Předmět: |
Mineral
Muscovite Geochemistry Bulk soil Soil Science 04 agricultural and veterinary sciences 010501 environmental sciences engineering.material 01 natural sciences Eluvium Solonetz Loam 040103 agronomy & agriculture engineering 0401 agriculture forestry and fisheries Clay minerals Biotite Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Eurasian Soil Science. 50:1468-1482 |
| ISSN: | 1556-195X 1064-2293 |
| DOI: | 10.1134/s1064229317120055 |
| Popis: | Data on the mineralogical composition of clay ( 10 μm) fractions of meadow solonchakous solonetzes (Calcic Gypsic Salic Stagnic Solonetz (Albic, Siltic, Columnic, Cutanic, Differentic)) developing from loesslike loam and clay in the North Crimean Lowland are presented. Fractions >5 μm constitute nearly 50% of the soil mass and are characterized by the same mineralogical composition in the entire profile; they consist of quartz, plagioclases, potassium feldspars, and micas (biotite and muscovite). The eluvial-illuvial redistribution of clay in the course of solonetzic process is accompanied by changes in the portion of mixed-layer minerals and hydromicas in the upper part of the profile; a larger part of the smectitic phase is transformed into the superdisperse state. In the eluvial SEL horizon and in the illuvial BSN horizon, the clay fraction is impoverished in smectitic phase and enriched in trioctahedral hydromicas. Upon calculation of the content of clay minerals per bulk soil mass, the distribution of mixed-layer minerals is either eluvial, or eluvial-illuvial, whereas the distribution of hydromicas has an illuvial pattern without distinct eluvial minimum in the SEL horizons. The eluvial-illuvial distribution pattern of clay minerals in solonetzes of the North Crimean Lowland is compared with the distribution pattern of clay minerals in solonetzes of the West Siberian Lowland. Coefficients characterizing differentiation of solonetzes by the contents of particular mineral components are suggested. |
| Databáze: | OpenAIRE |
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