Release:
Bulletin of Tyumen State University. Earth sciences (№7; №4). 2013About the authors:
Galina A. Merkushina, Postgraduate student, Institute of Mathematics, Science and Information Technologies, Tyumen State UniversityAbstract:
The paper presents the results of stratigraphic and geochemical study of peat bog Toporkovsky riam located in the Omsk region. According to radiocarbon dating of peat samples at different depths the age of formation of peat deposits is estimated — it is about 5200 years, the rate of accumulation of peat in different time intervals is calculated. On the basis of layered distribution of geochemical parameters (pH, Eh, Loss on ignition), with the stratigraphic data, two basic types of peat are determined in the peat bog. At the bottom of the cut there is a lowland peat bog (4200-5155 years), which higher in the section gives way to upland (4200 years ago to the present day) and very poorly defined transition layer of peat, which indicates a dramatic change in terms of the transition period. Determination of group composition of organic matter (I.V. Tyurin method modified by V.V. Ponomareva and T.A. Plotnikova) showed that fulvic acids predominate in the humus at all depths of occurrence of peat. Distribution of groups and factions of humic and fulvic acids on the depth of cut has a number of areas that can be used for paleoclimatic reconstructions conditions of their formation.Keywords:
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