Geochemistry of thirteen Voronin Trough cores,Kara Sea,European Arctic: Hg and As contaminants at a 1965 timeline |
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| Institution: | 1. Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran;2. No. 9, Parsa building, Sadaf st., Robat 3rd st., Isfahan 8196155379, Iran;1. Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, Campus Sur, Santiago de Compostela 15782, Spain;2. Institut für Geoökologie, AG Umweltgeochemie, Technische Universität Braunschweig, 38106 Braunschweig, Germany;3. Department of Geological Sciences, Stockholm University, SE-10691 Stockholm, Sweden;4. The Bolin Centre for Climate Research, Stockholm University, SE-10691 Stockholm, Sweden;5. Department of Ecology and Environmental Sciences, Umeå University, SE-901 87 Umeå, Sweden;6. Department of Geography and Environment, School of Geosciences, University of Aberdeen, Elphinstone Road, Aberdeen AB24 3UF, UK;7. Department of Archaeology, School of Geosciences, University of Aberdeen, Elphinstone Road, Aberdeen AB24 3UF, UK;8. Clare Hall, University of Cambridge, Herschel Road, Cambridge CB3 9AL, UK;1. State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;4. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The potentially toxic elements Hg and As are found at high concentrations in surface/near-surface sediments from Arctic ocean cores collected from the Voronin Trough, Kara Sea, during 1965. The levels reach 2045 ppb for Hg and 270 ppm for As. Manganese high values (up to 1.27%) are also found in the cores’ surface/near-surface sections. Other heavy metals tracked by the Arctic Monitoring and Assessment Program (e.g., Cu, Ni, Pb, Sb, Ti, Zn) have baseline concentrations in the cores. The cores average >57% clay-size and >35% silt-size in their textural composition. The elevated contents may result from anthropogenic input for Hg and As with diagenesis adding to the As concentration. Possible sources for these elements are emissions and effluents from industry such as mining and smelting operations, and burning of fossil fuels in Siberia and the Urals. When discharged into the Kara Sea from Siberian catchments, the As and Hg likely attach to charged particulate surfaces of Fe oxy/hydroxides (for As) and particulate organic matter or clay minerals (for Hg). These are transported, entrained in ocean currents or adhered to pack ice, to the Voronin Trough where they deposit according to size and specific gravity. |
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