Composition and structure of microaggregates in soils of the Behr hillocks, southern Astrakhan district

Autor:	Evgeny Shein, A. V. Fedotova, G. V. Kharitonova, S. E. Sirotskii, N. S. Konovalova, A. V. Dembovetskii
Rok vydání:	2014
Předmět:	Cutans Morphology (linguistics) Gypsum Mineralogy engineering.material Arid chemistry.chemical_compound chemistry Geochemistry and Petrology Soil water engineering Paddy field Carbonate Economic Geology Clay minerals Geology
Zdroj:	Lithology and Mineral Resources. 49:23-28
ISSN:	1608-3229 0024-4902
DOI:	10.1134/s0024490214010040
Popis:	Study of the composition, structure and morphology of microaggregates less than 1 mm in size in soils of one of the Behr hillocks revealed a high share of the clay-salt segregations (microaggregates and cutans). It was established that the segregation type depends on the mud content in soil, while the packing of particles, as well as the size and morphology of microaggregates, depend on the content and properties of salts. The clay component in the microaggregates is mainly represented by smectite. Carbonate (calcitic, dolomitic, and ferruginous) clay-salt microaggregates were found in all horizons of the studied soils, except for horizon Ap on the subhillock plain in the former rice paddy. Gypsum clay-salt microaggregates were identified in the salic horizon Bs of soils. The microaggregates in solonchaks were formed with the contribution of Na-Mg-Ca chlorides and sulfates. The formation of clay-salt aggregates promoted high microstructuring of soils and stability of the Behr hillocks under arid climatic conditions.
Databáze:	OpenAIRE
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