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NATURAL AND TECHNOGENIC RADIOISOTOPES AND MICROELEMENTS IN THE SECTION OF PEAT ACCUMULATION OF THE DULIKHA PEAT BOG (CISBAIKALIA): RETRODICTIONS OF ATMOSPHERIC INPUTS OF MINERAL MATTER

V. A. Bobrov, V. V. Budashkina, M. S. Melgunov, G. A. Leonova, A. E. Maltsev

V. S. Sobolev Institute of Geology and Mineralogy of SB RAS, Novosibirsk, Russia

Stratification of horizons has been conducted through the monolith section of the Dulikha bog peatland (Southern Cisbaykalia) based on the distribution analysis of 210Pb (natural) and 137Cs (technogenic) radioactivities. Naturally-radioactive (210Pb, 226Ra, 232Th, 238U, 40K) and technogenic (137Cs, 241Am) elements in peat ash samples for each horizon have been determined. Found values of specific activity of 210Pb, as well as 137Cs, 241Am ones, coming from the atmosphere during the period of 1953–1963, have been used for calculation of layers considering ash matter in each layer. The atomic absorption determination of 19th chemical elements content in each layer has been conducted. As the result, found values of element inputs to the earth surface for the second half of XX century proved comparable to values for regions of Western Siberia that underwent man-caused impact.

Keywords: peatlands, atmospheric precipitations, mineral matter, naturally and technogenic radioisotopes, microelements.

DOI 10.20403/2078-0575-2019-2-93-102