Valdaian glacial maxima in the Arkhangelsk district of northwestern Russia

Demidov, Igor; Houmark‐Nielsen, Michael; Kjær, Kurt H.; Funder, Svend; Larsen, Eiliv; Lyså, Astrid; Lunkka, Juha-Pekka; Saarnisto, Matti

doi:10.1016/s1571-0866(04)80082-4

Cited by 18 publications

(26 citation statements)

References 11 publications

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“…Western coast of the Kanin Peninsula Demidov et al (2004) supported earlier views on the limit of SIS based on the distribution of Scandinavian erratics, young eskers and hummocky moraines by Ramsay (1911), Devyatova (1969) and Aseev (1974), as indicated in Figs 1 and 2. However, our present understanding suggests the distribution of the Scandinavian till to be restricted only to the section near Tarkhanov southeast of the Cape Kanin Nos.…”

Section: Northern Coast Of the Kuloi Plateausupporting

confidence: 82%

“…This is confirmed by Kjaer et al (2006) and by Larsen et al (2006b). The presence of Scandinavian boulders, young eskers and sandy kames in the western parts of the Kanin Peninsula led Devyatova (1969), Aseev (1974) and Demidov et al (2004) to support the contention of Ramsay (1911) that the SIS reached the central axis of the Kanin Peninsula during the Last Glacial Maximum (LGM) (Fig. 1).…”

Section: Settingsupporting

confidence: 57%

“…Glacigenic deposits comprising till, fluvial and lacustrine sediments of the Late Weichselian Scandinavian glaciation dominate subsurface exposures in the western part of the discussed region, whereas the areas to the east were glaciated by the Barents and the Kara ice sheets in Early and Middle Weichselian time Larsen et al 2006a). A comprehensive review of previous investigations in northwestern Russia has been provided by Demidov et al (2004). Ramsay (1911) recognized three till units Devyatova (1969Devyatova ( , 1982, Armand (1969) (Kola Peninsula), Larsen et al (1999), Atlasov et al (1978), Arslanov et al (1984) (Dvina lowland) and Lunkka et al (2001).…”

Section: Settingmentioning

confidence: 99%

“…Because the top of the Kanin Ridge reaches altitudes of 100Á180 m a.s.l., and because older sediments lack till cover at sites 2Á7, we assume that this part of the Kanin Peninsula was ice-free during the Late Weichselian. Demidov et al (2004) proposed that the Pinega ice lobe covered a significant part of the Pinega ÁMezen watershed. However, new data from sections at Ezhuga, Karpogory and Verkola (Fig.…”

Section: Northern Coast Of the Kuloi Plateaumentioning

confidence: 99%

“…An almost straight-crested 130-km-long belt of hills can be traced from the mouth of the Pyoza River, southward through the Kuloi River and Mezen water divide. It was proposed to mark an end-moraine zone (Zatulskaya 1984c;Lavrov 1991) and according to Demidov et al (2004) it depicted the maximum extent of SIS. However, at exposures close to the mouth of the Pyoza River we have not identified any end-moraine ridges or Scandinavian till within this belt; on the contrary, this straight ridge merely reflects the strike of gently eastward dipping bedrock.…”

Section: Position Of the Last Sis In The Arkhangelsk Regionmentioning

confidence: 99%

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The last Scandinavian Ice Sheet in northwestern Russia: ice flow patterns and decay dynamics

Demidov¹,

Houmark‐Nielsen²,

Kjær³

et al. 2006

Boreas

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Advance of the Late Weichselian (Valdaian) Scandinavian Ice Sheet (SIS) in northwestern Russia took place after a period of periglacial conditions. Till of the last SIS, Bobrovo till, overlies glacial deposits from the previous Barents and Kara Sea ice sheets and marine deposits of the Last Interglacial. The till is identified by its contents of Scandinavian erratics and it has directional properties of westerly provenance. Above the deglaciation sediments, and extra marginally, it is replaced by glaciofluvial and glaciolacustrine deposits. At its maximum extent, the last SIS was more restricted in Russia than previously outlined and the time of termination at 18 Á16 cal. kyr BP was almost 10 kyr delayed compared to the southwestern part of the ice sheet. We argue that the lithology of the ice sheets' substrate, and especially the location of former proglacial lake basins, influenced the dynamics of the ice sheet and guided the direction of flow. We advocate that, while reaching the maximum extent, lobe-shaped glaciers protruded eastward from SIS and moved along the path of water-filled lowland basins. Ice-sheet collapse and deglaciation in the region commenced when ice lobes were detached from the main ice sheet. During the Lateglacial warming, disintegration and melting took place in a 200 Á600 km wide zone along the northeastern rim of SIS associated with thick Quaternary accumulations. Deglaciation occurred through aerial downwasting within large fields of dead ice developed during successively detached ice lobes. Deglaciation led to the development of hummocky moraine landscapes with scattered periglacial and ice-dammed lakes, while a subarctic flora invaded the region.

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Section: Northern Coast Of the Kuloi Plateausupporting

confidence: 82%