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VARIATION ASSESSMENT OF LAKE BOTTOM SEDIMENTS NATURAL RADIOACTIVITY IN DIFFERENT LANDSCAPE AREAS OF WESTERN SIBERIA
Abstract
In this work the received analytical material on bottom sediments more than 200 lakes is generalized in different landscape (climatic) zones of Western Siberia. The bottom sediments were studied by a set of modern methods of geochemistry, mineralogy, and crystal chemistry. We will try to highlight some of the general laws of horizontal and vertical distribution of natural radionuclides (NRN) in different types of bottom sediments of the inland lakes of Siberia. Based on NRN distribution in the bottom sediment of the lake, taking into account the mineral type of the sediment and water total mineralization, it can be argued that terrigenous silts inherit their contents in soils and soil-forming rocks, and correspond to NRN content in the upper continental crust to the greatest degree. Carbonate and organogenic silts are depleted of thorium, potassium and sometimes uranium, but under the certain conditions, there is selective accumulation of uranium. The reduced contents of thorium, uranium, and potassium in the bottom sediments of the in some landscape zones relate to the dilution of the studied sediments and soils by silica (quartz sand) or calcite (biochemical). Variations of the activity values of bottom sediment NRNs in different landscape zones are very small along the core, as well as within the water area of one lake. Exception is the vertical distribution of uranium in the bottom sediments of lakes, especially in the taiga and steppe zones. The estimates of the rates of undisturbed sedimentation during last 100 years, calculated by the model of constant flow (CF) by 210?b, roughly correspond to the dates obtained through simple extrapolation by 137Cs. Considering the assumptions, we can think that the linear rate of sedimentation at their natural occurrence varies in the lakes of different landscape zones of Siberia: in forest-tundra and steppe landscapes, it is 0,9 пїЅ 2,4 mm/year; in taiga and forest-steppe it is 2,5пїЅ 3,5 mm/year; in foothill-steppe, it is 3.0 - 4.5 mm/year.
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References9
Gavshin V.M., Natural Radioactivity, Sedimentary Rocks [in Russian], Russia, 1990.
Gavshin V.M., Shcherbov N.L., Mel’gunov M.S., Strakhovenko V.D., Bobrov V.A., Tsibul’chik V.M., 137Cs and 210Pb in lacustrine sediments of Stepnoi Altai as indicators of the dynamics of man-induced changes in geochemical background throughout the 20th century, Russian Geology and Geophysics, Russia, vol. 40/issue 9, pp 1331–1341, 1999.
Lisitzin A.P., The modern ideas of sediment formation in oceans and the seas. The ocean as the natural recorder of interaction of geospheres of Earth, World ocean. Volume II. Physics, chemistry and biology of the ocean. Sediment formation in the ocean and interaction of geospheres of the Earth, , 2014, pp 334-549.
Draft of standards of admissible influence for a river basin Ob, Book 2. Explanatory note, Russia, 2012, pp 206.
Rikhvanov L.P., Radioelements in a surrounding medium and radioecology problems: manual, Russia, 2009, pp 430.
Strakhovenko V.D., Taran O.P., Ermolaeva N.I., Geochemical characteristics of the sapropel sediments of small lakes in the Ob’–Irtysh interfluve, Russian Geology and Geophysics, Russia, vol. 55/issue 2014, pp 1160–1169.
Strakhovenko V.D., Shcherbov B.L., Malikova I.N., Vosel’ Yu.S., The regularities of distribution of radionuclides and rare-earth elements in bottom sediments of Siberian lakes, Russian Geology and Geophysics, Russia, vol. 51/issue 2010, pp 1167–1178.
Titaeva N.A., Nuclear Geochemistry [in Russian], Russia, 2000.
Yaroshevsky A.A, The problem of modern geochemistry: Abstracts of lectures, Russia, 2004, pp 194.
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