Glacial flow systems in the zone of confluence between the Scandinavian and Novaja Zemlya Ice Sheets
1995; Elsevier BV; Volume: 14; Issue: 6 Linguagem: Inglês
10.1016/0277-3791(95)00026-l
ISSN1873-457X
Autores Tópico(s)Methane Hydrates and Related Phenomena
ResumoThe glacial geomorphology of the eastern Kola Peninsula, northwestern Russian Plain, Pechora lowland, northern Ural mountains and southern Novaya Zemlya (1,000,000 km2) was mapped using Landsat satellite imagery. Glacial flow-parallel lineations and marginal and interlobate features were identified. The directions of glacial flow and the patterns of deglaciation were reconstructed. The Scandinavian Ice Sheet expanded northeastwards into the southern Barents Sea, while the Novaya Zemlya Ice Sheet spread southwestwards into the same area; the two coalesced in the Kanin region and subsequently flowed from the Barents Sea towards the land. During the deglaciation of the Scandinavian Ice Sheet, flow was initially oriented from the White Sea region towards the Barents Sea; subsequently several ice streams, controlled by the regional topography, were formed. The growth of the Novaya Zemlya Ice Sheet occurred east of the islands, whereas during the decay there was more ice on the western side. A compilation of dated sequences up to 300 km inland from the coast indicate a Late Weichselian age of deglaciation. Separation of the two ice sheets occurred along the saddle between the Kanin and Kola Peninsulas at about 13,000 BP (15,500 cal. years BP), which became the locus for discharge of the proglacial Dvina-Pechora lake into the sea. Beyond the presumed Late Weichselian limits, older flow patterns are recognised. These patterns, along with dispersal of erratics, suggest that the growth of a more extensive glaciation started in the Novaya Zemlya region; later the Scandinavian Ice Sheet occupied areas previously covered by the Novaya Zemlya Ice Sheet.
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