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MAIN PAGE > Journal "Arctic and Antarctica" > Rubric "Soils of Cold Plains and Mountain Regions"
Soils of Cold Plains and Mountain Regions
Vasil'chuk J.Y., Krechetov P.P., Litvinskiy V.A. - Isotope and geochemical composition of carbonate soil new growths of the Julukul basin, the Altai Mountains pp. 104-115


Abstract: The research subject is carbonate dripstones and pendants on the lower surfaces of coarse clastic rocks, typical for the regions with sharply continental arid climate. Calcareous crusts, pendants, are complex bedded bodies, containing both carbonate and silicate materials with thin patches of organic material. The width of pendants varies from 2 to 7 mm. The studied new growths are located within the cryoarid soils’ profiles of the Julikul basin. The key characteristics of isotope and geochemical composition of carbonate pendants are: the oxygen and carbon isotopes composition and the gross number of macro- and micro elements. The research methods include: the mass-spectrometer measurement of the isotope composition, the x-ray and fluorescence analysis of the gross number of macro- and micro elements, the gas-volume method of measurement of disperse carbonates ratio in soils and the method of ion chromatography for the measurement of water-soluble carbonates. The authors characterize the isotope and element composition of carbonate pendants. Carbonate new growths in cryoarid soils are presented basically by calcium carbonates, but the materials of new growths often contain silicon, aluminium and ferrum. Among the measured materials, MN, Sr, Cu and Cr have the most significant concentrations. There is a tendency to the weighing of the isotope composition of carbon and the lighting of the isotope composition of carbon from the internal to the external layers of carbonate pendants. These data prove that the environmental conditions were changing during the pendants formation. 
Vasil'chuk J.Y., Budantseva N.A., Garankina E.V., Shorkunov I.G., Vasil'chuk Y.K. - Isotopic and geochemical features of histosols of the Bovanenkovo gas field, the Central Yamal Peninsula pp. 110-126


Abstract: Polygonal tundra histosols are among the most widespread soils of the Central Yamal Peninsula (around Bovanenkovo) together with Gleysols and Cryosols. The authors study the trench crossing the peat polygons on the surface of the third terrace near Bovanenkovo village. The authors study the transformation of sub-types of histosols from oligotrophic to eutrophic histic horizons. It is impossible to properly describe the soils of those flat-topped polygonal landscapes, according to the current classification of Russian soils, due to the small variety of organic horizons and strict criteria for their differentiation. The authors assigned Sphagnum horizon to the horizon T, and the underlying layer of eutrophic peat – to the TE horizon. Thus the authors classify such type of soil as eutrophic peat despite the presence of oligotrophic peat components. The age of peat was ascertained using the scintillation radiocarbon methodic. Carbon dioxide emission was measured by a portable gas-analyzer. The content of oxygen, carbon and nitrogen in the peat was measured as well as the composition of carbon stable isotopes . The considered Histosols are aged 2,5 thousand years. At the top of the polygonal mound in the profile the authors trace an increase in sulfur (apparently associated with the darker colored peat layer) and nitrogen content and a decrease in the carbon content. At the same time local maximum of the carbon isotope composition was observed. The carbon content varies in general from 45 to 28%. The carbon isotope composition is from –25.5 to –28 ‰, which is close to the values in organic horizons of soils in the Arctic regions.
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