Last Interglacial marine environments in the White Sea region, northwestern Russia |
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| Authors: | KARI GRØSFJELD SVEND FUNDER MARIT-SOLVEIG SEIDENKRANTZ CHRIS GLAISTER |
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| Institution: | (e-mail: ), Geological Survey of Norway, NO-7491 Trondheim, Norway;Geological Museum, University of Copenhagen, DK-Øster Voldgade 5–7, DK-1350 Copenhagen K, Denmark;Department of Earth Sciences, University of Aarhus, C F. Møllers Allé120, DK-8000 Århus C, Denmark;Westlakes Scientific Consulting, The Princess Royal Building, Westlakes Science and Technology Park, Moor Row, Cumbria, CA24 3LN, UK |
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| Abstract: | Marine sediments from river sections in the Mezen River drainage, northwest Russia, have been analysed for dinoflagellate cysts, foraminifers and molluscs. The sediments were dated by pollen analysis and by reference to the local sea-level history, and are Late Saalian to late Eemian (c. 133 to 119.5?kyr in age). The Late Saalian deglaciation was characterized by Arctic conditions, but a few centuries into the Eemian the Gulf Stream system carried warm Atlantic water into the region. At 129.8?kyr BP there was a marked increase in the influx of Atlantic water, and the advection of warm Atlantic water was stronger and probably penetrated further eastwards than at present. The molluscs, dinoflagellate cysts and foraminifers reflect conditions warmer than present and that the optimum temperature occurred at the time of the early Eemian global sea-level rise. Around 128?kyr BP, the eustatic sea-level rise was curbed by isostatic rebound and accompanying regression and constriction of marine passages to the White Sea. Local, low-saline, stratified basins developed and characterized the next five to six millennia. |
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