Pleistocene stratigraphy of the Vychegda River basin, European North-East

Zaretskaya, N. E.; Панин, А. В.; Molodkov, Anatoly; Трофимова, С. С.; Симакова, А.Н.; Баранов, Д. В.

doi:10.1016/j.quaint.2019.09.020

Cited by 6 publications

(15 citation statements)

References 23 publications

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“…2a) and continuing upstream. The Tolokonka and Baika sections have been previously studied by different research groups (Sidorchuk et al, 2001; Maksimov et al, 2011; Larsen et al, 2014; Lyså et al, 2014; Zaretskaya et al, 2019; 2020). In this section we present these results alongside our own findings to form a complete picture of the proglacial lake sediment structure and dating results.…”

Section: Resultsmentioning

confidence: 99%

“…9, Table 3). In the palynological spectra arboreal pollen dominates (40–70%) and the percentage of spores is significant (7–30%) (Zaretskaya et al, 2020). Trees are represented by Picea (10–30%), Pinus ( Pinus sylvestis 6–20%, Pinus sect.…”

Section: Resultsmentioning

confidence: 99%

“…There was an interesting find of Schoenus nigricans (Cyperaceae) seeds that are characteristic of the interstadial flora of Eastern Europe. The results of pollen analysis revealed a cold–warm–cold rhythm (Zaretskaya et al, 2020). At the bottom part, shrub tundra with patches of forest‐tundra (with Selaginella selaginoides ) was reconstructed; the climate was relatively cold.…”

Section: Resultsmentioning

confidence: 99%

“…Pollen analysis revealed a predominance of spruce and pine, with the presence of alder, birch and gramineous plants, characteristic of modern northern taiga coniferous forests with grassland. The presence of soil fungi Meliola and Glomus together with remnants of soil Acarians and absence of algae spores points to subaerial origin of this unit (Zaretskaya et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

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Limited extension of the MIS 2 proglacial lake in the Severnaya Dvina valley, south‐eastern margin of the last Scandinavian Ice Sheet

Zaretskaya,

Utkina,

Baranov

et al. 2023

J Quaternary Science

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The Severnaya Dvina River valley crosses the former south‐eastern margin of the last Scandinavian Ice Sheet. Despite a long research history, there remains considerable controversy about the maximum ice‐sheet extent and the expansion of proglacial lakes within the Severnaya Dvina fluvial system. The goal of this study was to address these issues using new material from the valleys of the Severnaya Dvina and the lower Vychegda, thereby contributing to an understanding of the history of the south‐eastern sector of the last Scandinavian Ice Sheet and its periglacial areas. We studied a number of geological sections using radiocarbon and optically stimulated luminescence (OSL) dating, pollen and carpological analyses, and found that the Last Glacial Maximum (LGM) proglacial lake occupied the Severnaya Dvina valley between 20–19 ka and about 15.5 ka. The lake was localized within the proglacial isostatic depression and occupied only the Severnaya Dvina valley extending no further than the confluence of the Vychegda River, no more than 110 km from the edge of the ice sheet. The lake formation did not cause any drainage reorganization within and outside the Vychegda fluvial system. Given the small size of the lake and presence of the oldest OSL ages along the entire length of the former lake, we suggest that the onset of the proglacial lake marks the maximum extent of the ice sheet in the area. Consequently, the onset of the local LGM may be dated to 20–19 ka, somewhat earlier than assumed by most previous researchers. The LGM ice sheet boundary was located in the Severnaya Dvina valley downstream from the Vychegda confluence and did not extend into the Vychegda valley, despite previous suggestions. During deglaciation, the lake disappearance together with crustal rebound caused an incision episode in the Vychegda – Severnaya Dvina system and the formation of the Lateglacial alluvial terrace with relative height rising downstream due to the uneven rates of the postglacial uplift.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Limited extension of the MIS 2 proglacial lake in the Severnaya Dvina valley, south‐eastern margin of the last Scandinavian Ice Sheet

Zaretskaya,

Utkina,

Baranov

et al. 2023

J Quaternary Science

Self Cite

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show abstract

“…Our studies were motivated by the above-mentioned controversies in paleogeographic reconstructions for the Vychegda -Severnaya Dvina fluvial system. Extensive investigations through these valleys (24 new sections) allowed us to state that the alluvial and aeolian sedimentary pattern dominated within the Vychegda basin during the MIS 2 (Zaretskaya et al, 2020): the 2 nd (27-17 ka BP) and 1 st (17-11.7 ka BP) alluvial terraces had been forming, and the incision of Vychegda took place ca 17 ka BP due to probably the final drainage of the proglacial lake in the Severnaya Dvina valley and climate-driven increase of river water runoff. The LGM proglacial lake was spatially restricted within the Severnaya Dvina valley and extended upstream not more than 120 km from the ice margin established in as it was found that the lake did not reach the Vychegda -Severnaya Dvina confluence (Zaretskaya et al, 2020).…”

Section: Applications Of Unmanned Aerial Vehicle (Uav) Surveys Andmentioning

confidence: 99%