Elemental composition of cryozems of the territory of the Bovanenkovo oil and gas condensate field (Central Yamal)
D.N. BALYKIN, N.M. KOVALEVSKAYA, A.V. PUZANOV, S.N. BALYKIN, A.V. SALTYKOV
Institute for Water and Environmental Problems, Siberian Branch, Russian Academy of Sciences, Barnaul, Russia
Keywords: macroelements, microelements, total content, soils, Yamal Peninsula, soil horizons
Abstract
The article presents the results of studies on the elemental chemical composition of cryozems in the Bovanenkovo oil and gas condensate field (Yamal Peninsula). Due to the intensive development of hydrocarbon deposits the anthropogenic load on natural ecosystems of the cryolithozone is growing in the conditions of a changing climate, which can lead to a change in the geochemical background and migration of chemical elements in the soil and vegetation cover. The main physical and chemical properties and granulometric composition of the soils were determined. The total content of macro- and microelements K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Ga, Ge, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Ag, Cd, Sn, Sb, As, Pb, Th, U was assessed and general patterns of their profile distribution were identified. The average values of element concentration clarkes (CC) were calculated. It was established that in the soil samples of organic horizons CC > 1 for Br, Cd, Ag, As, Se, Zn, Pb, Mn, Fe, Ni, Y, Zr, Sb, Cr, V, Cu, Ge. In mineral horizons, CC > 1 for Ag, Br, As, Cd, Zr, Mo, Sb. A comparative analysis of the element content of in the soils of the Bovanenkovo OGCF with the regional geochemical background was carried out. It was revealed that the organic horizons of cryozems differed from the mineral ones by a higher total content of macro- and microelements. Zones of macro- and micronutrient accumulation in suprapermafrost soil horizons have been identified. The results of the study showed that the content and pattern of the profile distribution of elements in soils were due to the granulometric composition of soil-forming rocks, as well as accumulation at the biogeochemical, oxidative and permafrost barriers. A close positive correlation (r = 0.8 - 0.9) was revealed in the mineral horizons of soils between: concentrations of Mn, Fe, Zn, Rb, Y, Nb, Sn, Sb, Pb, Th and the content of physical clay; Ca, Ni, Cu, Br, Sr, Mo, Cd and organic matter; Ni, Cu, Nb, Sn, Sb, As, Pb, Th, Cd, Mn, Zn, Rb, Y, Pb and the total iron content.
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