Известия Томского политехнического университета: Инжиниринг георесурсов (Nov 2017)
Distribution of chemical elements in geochemically conjugated wetland landscapes of the taiga zone in Western Siberia
Abstract
The aim the study. In the taiga zone of Western Siberia geochemically conjugated marsh landscapes associated with migratory flows of surface and soil-groundwater are spread. The aim of the work is to study the distribution of a group of elements in a peat deposit of two geochemically conjugated bogs occupying a watershed and a terrace within a common interfluve. Relevance. The data on distribution of elements in geochemically conjugated pools of bogs allow us to relate the conditions of peat accumulation (relief, composition of sedimentary interfluves, vegetation cover, water-mineral regime) to migration of mineral compounds in marsh landscapes of the interfluve. The information obtained is relevant in environmental applications. It can be used to assess the reservoir of a low-lying terraced swamp as a geochemical barrier in protection of river waters from man-made pollution. Research methods. The work included peat sampling on two geochemically conjugated peat bogs (Chistoe and Klyukvennoe) and analysis of samples for the content of ash-forming elements and trace elements. On each swamp, five technological samples were selected, in which the content of Ca, Fe, Co, La, Sc, Ce, Th, Br was determined using the instrumental neutron activation analysis. In addition, the content of Mn is determined by a bulk method with a photocolorimetric termination. Results. It is established that the ash content in peat bog Klyukvennoe is 3,8 times higher than in the peat of Chistoe. The contribution of different elements to mineralization of the peat deposit of Klyukvennoe bog is significantly different. The greatest increase (in 8-10 times) is revealed in Fe and Mn. The average growth rates (4,5-5 times) were noted in Sc, Co. The minimum values of growth (2-3 times) were recorded in Ca, Ce, Th, La, Br. Conclusions. Peat deposit mineralization at Klyukvennoe bog is associated with removal of iron, manganese and other elements during interfluve slope swamping and their subsequent accumulation in Klyukvennoe bog.
