DBPapers
DOI: 10.5593/sgem2017/32/S13.049

MICROMORPHOLOGICAL AND MINERALOGICAL DIAGNOSTICS OF POST-AGROGENIC EVOLUTION OF GYPSIC SALIC SOLONETZ IN THE NORTH OF THE CASPIAN LOWLAND, RUSSIA

M. Lebedeva, E. Varlamov, N. Chizhikova, N. Churilin, T. Romanis
Tuesday 12 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7408-05-8 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 32, 373-380 pp, DOI: 10.5593/sgem2017/32/S13.049

ABSTRACT

This paper presents macro- and micromorphological, mineralogical and physicochemical characteristics of solonetzic processes that developed within a 14-cm-thick plough (P) layer of non-ameliorated Solonetz over a 50-year-long period of its post-agrogenic evolution. These processes have resulted in the formation of a microporofile with micromorphological features of eluvial-illuvial differentiation within the former plough layer. The mineralogical analysis of particle-size fractions (˂1, 1–5, 5–10, >10 μm) of the post-agrogenic Solonetz shows that the clay fraction (˂1 μm) of loamy parent material is dominated by complex random-sequence mica/smectite minerals; other constituents in the order of decreasing proportions are hydromica, chlorite and kaolinite. The upper eluvial microhorizons (AJ1el and AJ2el, 0-3 cm) of the former P layer are characterized by a decreased content of clay fraction and most significant changes in its mineralogical composition: a relative decrease in the content of mica/smectite and relative increase in the content of finely dispersed quartz, plagioclases and potassium feldspars. The lower illuvial microhorizon (Psn,pa, 7-14 cm) of the former P layer is characterized by relatively increased contents of both clay fraction and mixed-layer mica/smectite components of this fraction. The differentiation observed within this microprofile is connected with decomposition of the clay minerals in the upper microhorizons and their migration/illuviation into the lower microhorizons. The data obtained on the mineralogical differentiation of the former plough layer of non-ameliorated Solonetz are indicative of initial stages of solonetzic process that has developed within this layer over a 50-year-long period of post-agrogenic soil evolution under conditions of increasing climate humidity.

Keywords: Solonetz, micromorphology, mineralogy, evolution.

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