Abstract
This paper addresses the distribution of heavy metals (Co, Ni, Cu, Zn, Cd, Sn, Sb, Pb, and Bi) as well as Si, Al, Fe, and Mn in the surface (0–2 cm) layer of bottom sediments of the Kara Sea. The contents of these elements are determined in each of the previously distinguished facies-genetic types of terrigenous sediments: fluvial, glacial, estuarine, shallow water–marine, “background” marine, and relict sediments. It is shown that these types reflect the modern conditions of accumulation of river discharge material, which forms fans of two greatest Siberian rivers, Ob and Yenisei. The main stages are distinguished in heavy metal accumulation. The first stage is related to the avalanche sedimentation of terrigenous sediments in the estuary and characterized by the elevated contents of Co, Ni, Cu, Zn, Cd, Sb, and Bi. The second stage reflects the mechanical differentiation of sedimentary material by waves and bottom currents in a shallow-water sea part adjacent to the estuarine zone, with accumulation of Pb- and Sn-bearing “heavy” ore minerals. The deepwater background terrigenous–marine sediments accumulate mainly Ni, Zn, and Cd, as well as Mn. The relict sediments differ in the high contents of Si, Mn, and Sn.
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Original Russian Text © V.Yu. Rusakov, T.G. Kuzmina, M.A. Levitan, E.S. Toropchenova, A.V. Zhilkina, 2017, published in Geokhimiya, 2017, No. 12, pp. 1088–1099.
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Rusakov, V.Y., Kuzmina, T.G., Levitan, M.A. et al. Heavy metal distribution in the surface layer of bottom sediments of the Kara Sea. Geochem. Int. 55, 1079–1089 (2017). https://doi.org/10.1134/S0016702917090075
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DOI: https://doi.org/10.1134/S0016702917090075