Pleistocene sediments of the eastern Barents Sea (Central Deep and Murmansk Bank): Communication 2. Lithological composition and formation conditions |
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Authors: | O G Epshtein A G Dlugach A V Starovoytov and B F Romanyuk |
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Abstract: | Llithology of massive diamictons was studied in two areas of the eastern Barents Sea using cores and geophysical data. These
sediments dominate in the Pleistocene section as two seismostratigraphic complexes (SSC): Upper Weichselian (SSC III) and
locally distributed Lower Weichselian (SSC V). Diamictons of these complexes represent tills produced by the geological activity
of the Pleistocene Novaya Zemlya and Scandinavian ice sheets. The Upper Weichselian glacial sequence is laterally heterogeneous.
It includes two seismic facies represented by ordinary (overconsolidated) tills (they also constitute SSC V) and a spacious
moraine of the specific type with the normally consolidated sediments (they avoided compaction by the ice load) and certain
lithological specifics. The last glacial sediments were formed in a specific subglacial setting similar to the sediments under
fast ice streams of Antarctica. However, the specific features allow us to define these sediments as a new (Barents Sea) facies
of tills related to zones of intense basal melting of glaciers. |
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