SEDIMENTATION AND ACCUMULATION OF ELEMENTS IN THE VYDRINO PEAT BOG (Southern Baikal Region)
A.A. Bogush1, V.A. Bobrov1, M.A. Klimin2, V.A. Bychinskii3, G.A. Leonova1, S.K. Krivonogov1,4, L.M. Kondrat’eva2, Yu.I. Preis5
1V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Institute for Water and Environmental Problems, Far Eastern Branch of the Russian Academy of Sciences, ul. Dikopoltseva 56, Khabarovsk, 680000, Russia
3A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia
4Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
5Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Sciences, Akademicheskii pr. 10, Tomsk, 634055, Russia
Keywords: Peat bog, concentration of elements, genesis, rate of peat accumulation, pigment profile, geochemical modeling, Holocene, East Siberia
Abstract
The evolution of peat deposits of the Vydrino bog (southern Baikal region) and concentration of elements in them are discussed. The bog peat massif more than 4 m in thickness formed mostly during the Holocene. The beginning of peat formation dates back to the late Allerød (13.1 ka). At present, the Vydrino bog is a biogeocoenosis of the high-moor type with a transitional peat deposit. We have established that the bog nonuniformly accumulated chemical elements during its formation. Concentration of Pb, Sn, Cd, Zn, and Sb in recent vegetation and in the upper layer of the peat bog is mainly due to forest fires and anthropogenic air pollution. The anomalous enrichment of peat with Zn and Cu in the Early Holocene (12.1-8.8 ka) horizons proceeded through the periodic inflow of thermal groundwater into the bottom part of the peat deposit. Authigenic Zn and Cu sulfides formed on the inner membrane of the cell wall of sphagnum moss. Geochemical modeling has shown that Zn and Cu sulfides can form abiotically.
DOI: 10.15372/RGG2019012
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