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  • 1
    Electronic Resource
    Electronic Resource
    Pleistocene stratigraphy of Kongsfjordhallet, Spitsbergen, Svalbard (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 18 (1999), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Open sections along Kongsfjodhallet, the north-western coast Kongsfjorden, Svalbard, exhibit marine and glacigenic sediments of Early to Late Plestocene age. Glaciatio, deglaciation and subsequent isostatic rebound caused the formation of three sedimentary successions (A, B and C) that comprise till grading upward into glaciomarine mud, followed by shell-bearing sand, and finally littoral sand and gravel. Six major lithostratigraphic units are recognized. Succession C comprises units 1 and 2, which were deposited during an Early Pleistocene glaciation, followed by deglaciation and subsequent beach progradation. Succession B is divisible into units 3 and 4 and reflects glaciation and eventual emergence as a result of isostatic response. The youngest succesion (A) comprises units 5 and 6, and reflects fiord glaciation followed by a regression during an Early Weichselian glaciation-deglaciation episode. Ice-free conditions may have prevailed untill the Late Weichselian, when a glaciation, confined to the fiord trough, covered parts of Kongsfjordhallet. Deglaciation and isostatic rebound are recorded by Holocene marine terraces up to ca 40 m a. s. l.Marine and glacial events from Kongsfjordhallet are compared with stratigraphic evidence from adjacent regions and it is suggested that the Late Weichselian ice configuration was of a more restricted nature than proposed by previous authors. Glaciers. draining through the larger ford troughs reached the shelf break. while at the same time other parts of western Svalbard could have experienced restricted glaciation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1999.tb00276.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    The periglacial climate and environment in northern Eurasia during the Last Glaciation (2004)
    Elsevier
    In:  Quaternary Science Reviews, 23 (11-13). pp. 1333-1357.
    Details
    Publication Date: 2015-02-10
    Description: This paper summarizes the results of studies of the Late Weichselian periglacial environments carried out in key areas of northern Eurasia by several QUEEN teams (European Science Foundation (ESF) programme: “Quaternary Environment of the Eurasian North”). The palaeoglaciological boundary conditions are defined by geological data on timing and extent of the last glaciation obtained in the course of the EU funded project “Eurasian Ice Sheets”. These data prove beyond any doubt, that with the exception of the northwestern fringe of the Taymyr Peninsula, the rest of the Eurasian mainland and Severnaya Zemlya were not affected by the Barents–Kara Sea Ice Sheet during the Last Glacial Maximum (LGM). Inversed modelling based on these results shows that a progressive cooling which started around 30 ka BP, caused ice growth in Scandinavia and the northwestern areas of the Barents–Kara Sea shelf, due to a maritime climate with relatively high precipitation along the western flank of the developing ice sheets. In the rest of the Eurasian Arctic extremely low precipitation rates (less than 50 mm yr−1), did not allow ice sheet growth in spite of the very cold temperatures. Palaeoclimatic and palaeoenvironmental conditions for the time prior to, during, and after the LGM have been reconstructed for the non-glaciated areas around the LGM ice sheet with the use of faunal and vegetation records, permafrost, eolian sediments, alluvial deposits and other evidences. The changing environment, from interstadial conditions around 30 ka BP to a much colder and drier environment at the culmination of the LGM at 20–15 ka BP, and the beginning of warming around 15 ka BP have been elaborated from the field data, which fits well with the modelling results.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.quascirev.2003.12.012
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Late Quaternary ice sheet history of northern Eurasia (2004)
    Elsevier
    In:  Quaternary Science Reviews, 23 (11-13). pp. 1229-1271.
    Details
    Publication Date: 2019-09-23
    Description: The maximum limits of the Eurasian ice sheets during four glaciations have been reconstructed: (1) the Late Saalian (〉140 ka), (2) the Early Weichselian (100–80 ka), (3) the Middle Weichselian (60–50 ka) and (4) the Late Weichselian (25–15 ka). The reconstructed ice limits are based on satellite data and aerial photographs combined with geological field investigations in Russia and Siberia, and with marine seismic- and sediment core data. The Barents-Kara Ice Sheet got progressively smaller during each glaciation, whereas the dimensions of the Scandinavian Ice Sheet increased. During the last Ice Age the Barents-Kara Ice Sheet attained its maximum size as early as 90–80,000 years ago when the ice front reached far onto the continent. A regrowth of the ice sheets occurred during the early Middle Weichselian, culminating about 60–50,000 years ago. During the Late Weichselian the Barents-Kara Ice Sheet did not reach the mainland east of the Kanin Peninsula, with the exception of the NW fringe of Taimyr. A numerical ice-sheet model, forced by global sea level and solar changes, was run through the full Weichselian glacial cycle. The modeling results are roughly compatible with the geological record of ice growth, but the model underpredicts the glaciations in the Eurasian Arctic during the Early and Middle Weichselian. One reason for this is that the climate in the Eurasian Arctic was not as dry then as during the Late Weichselian glacial maximum.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.quascirev.2003.12.008
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Age determinations from northwest Russia
    PANGAEA
    In:  Supplement to: Larsen, Eiliv; Lyså, Astrid; Demidov, Igor; Funder, Svend; Houmark-Nielsen, Michael; Kjær, Kurt Henrik; Murray, Andrew Sean (1999): Age and extent of the Scandinavian ice sheet in northwest Russia. Boreas, 28(1), 115-132, https://doi.org/10.1111/j.1502-3885.1999.tb00209.x
    Details
    Publication Date: 2023-05-12
    Description: The last glacial maximum (LGM) of the Scandinavian ice sheet in the Arkhangelsk region has been identified morphologically as ridges and hummocks in an otherwise flat topography. Stratigraphically the limit is marked by the presence of till above Mikhulinian (last interglacial) sediments inside the ridges and by the absence of till outside the ridges. During the LGM, ice flowed into the region from the north and northwest forming a lobe in the Dvina--Vaga depression. The continuation northward, northeast of Arkhangelsk, is still somewhat uncertain, but evidence suggests that the outer margin of the Scandinavian ice sheet was situated in the Mezen drainage basin. Luminescence and radiocarbon dates suggest that the maximum position was attained after some 17 ka ago, and that deglaciation started close to 15 ka ago. This age for the maximum position is younger than the maximum position in the western peripheral areas of the Scandinavian ice sheet. This may be accounted for by initial ice build-up in the west followed by a successive migration of the ice divide(s) to the east as ice growth continued. Deglaciation was either by lateral retreat or isolation of dead ice masses causing areal downwasting.
    Keywords: Bobrovo; Chelmokhta; Koleshka; OUTCROP; Outcrop sample; Pasva; Psaryovo; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped; Raibola; Smotrakovka; Trepyzovo
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    (Table 1) Luminescence age determination of sediments from the Arkhangelsk area
    PANGAEA
    In:  Supplement to: Lyså, Astrid; Demidov, Igor; Houmark-Nielsen, Michael; Larsen, Eiliv (2001): Late Pleistocene stratigraphy and sedimentary environment of the Arkhangelsk area, northwest Russia. Global and Planetary Change, 31(1-4), 179-199, https://doi.org/10.1016/S0921-8181(01)00119-9
    Details
    Publication Date: 2023-05-12
    Description: The Arkhangelsk area lies in the region that was reached by the northeastern flank of the Scandinavian ice sheet during the last glaciation. Investigations of Late Pleistocene sediments show interglacial terrestrial and marine conditions with sea level up to 52 m above the present level. An unconformity in the stratigraphy suggests a hiatus representing the Early Valdaian (Weichselian) and the beginning of the Middle Valdaian. This unconformity could be related to a low base level and isostatic depression of the area north of Arkhangelsk, either caused by ice masses advancing from the Kara and Barents ice sheets and/or to Scandinavian ice over the Kola Peninsula. During Middle Valdaian, from c. 66 ka BP, until the advance of the Late Valdaian glacier, c. 17-16 ka BP, peat formation, and northward fluvial sedimentation occurred coexisting with permafrost conditions in a later phase. Before the glacier advance, the base level rose and thick vertical accumulations of fluvial sediments were formed. Associated with this glacier advance from the north-northwest, ice damming occurred. Fluvial drainage was opposite to the present drainage pattern and deposition appeared in glaciolacustrine ponds in the area outside the limit of the glaciation. After the deglaciation that started c. 15 ka BP, permafrost conditions and downwasting of buried stagnant glacier ice prevailed until at least 10.7 ka BP.
    Keywords: Age, dated; Age, dated standard deviation; Age, optical stimulated luminescence (OSL); Area/locality; Dose rate; Equivalent dose; LATITUDE; Lithology/composition/facies; LONGITUDE; Quaternary Environment of the Eurasian North; QUEEN; Replicates; Sample code/label; Sample code/label 2
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
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    DATA PANGAEA
  • 6
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    (Table 1) Luminescence datings from Varchushka and Pyoza rivers, Russia
    PANGAEA
    In:  Supplement to: Houmark-Nielsen, Michael; Demidov, Igor; Funder, Svend; Grøsfjeld, Kari; Kjær, Kurt Henrik; Larsen, Eiliv; Lavrova, Nadya; Lyså, Astrid; Nielsen, Jan K (2001): Early and Middle Valdaian glaciations, ice-dammed lakes and periglacial interstadials in northwest Russia: new evidence from the Pyoza River area. Global and Planetary Change, 31(1-4), 215-237, https://doi.org/10.1016/S0921-8181(01)00121-7
    Details
    Publication Date: 2023-05-12
    Description: The Pyoza River area in the Arkhangelsk district exposes sedimentary sequences suitable for study of the interaction between consecutive Valdaian ice sheets in Northern Russia. Lithostratigraphic investigations combined with luminescence dating have revealed new evidence on the Late Pleistocene history of the area. Overlying glacigenic deposits of the Moscowian (Saalian) glaciation marine deposits previously confined to three separate transgression phases have all been connected to the Mikulinian (Eemian) interglacial. Early Valdaian (E. Weichselian) proglacial, lacustrine and fluvial deposits indicate glaciation to the east or north and consequently glacier damming and meltwater run-off in the Pyoza area around 90-110 ka BP. Interstadial conditions with forest-steppe tundra vegetation and lacustrine and fluvial deposition prevailed at the end of the Early Valdaian around 75-95 ka BP. A terrestrial-based glaciation from easterly uplands reached the Pyoza area at the Early to Middle Valdaian transition around 65-75 ka BP and deposited glaciofluvial strata and subglacial till (Yolkino Till). During deglaciation, laterally extensive glaciolacustrine sediments were deposited in ice-dammed lakes in the early Middle Valdaian around 55-75 ka BP. The Barents–Kara Sea ice sheet deposited the Viryuga Till on the lower Pyoza from northerly directions. The ice sheet formed the Pyoza marginal moraines, which can be correlated with the Markhida moraines further east, and proglacial lacustrine deposition persisted in the area during the first part of the Middle Valdaian. Glacio-isostatic uplift caused erosion followed by pedogenesis and the formation of a deflation horizon in the Middle Valdaian. Widely dispersed periglacial river plains were formed during the Late Valdaian around 10-20 ka BP. Thus, the evidence of a terrestrial-based ice sheet from easterly uplands in the Pyoza area suggests that local piedmont glaciers situated in highlands such as the Timan Ridge or the Urals could have developed into larger, regionally confined ice sheets. Two phases of ice damming and development of proglacial lakes occurred during the Early and Middle Valdaian. The region did not experience glaciation during the Late Valdaian.
    Keywords: Age, dated; Age, dated standard deviation; Age, optical stimulated luminescence (OSL); Dose rate; Dose rate, standard deviation; ELEVATION; Equivalent dose; LATITUDE; Lithologic unit/sequence; Lithology/composition/facies; LONGITUDE; Number; Quaternary Environment of the Eurasian North; QUEEN; Replicates; Sample code/label; Sample code/label 2; Water content, wet mass
    Type: Dataset
    Format: text/tab-separated-values, 528 data points
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    DATA PANGAEA
  • 7
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    Table 1. Luminescence ages of 6 sites from northwest Russia
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age, dated; Age, dated material; Age, dated standard deviation; Age, optical stimulated luminescence (OSL); Bobrovo; Chelmokhta; Dose rate; ELEVATION; Equivalent dose; Event label; Koleshka; Latitude of event; Longitude of event; OUTCROP; Outcrop sample; Pasva; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped; Raibola; Replicates; Sample code/label; Smotrakovka; Trepyzovo
    Type: Dataset
    Format: text/tab-separated-values, 140 data points
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    DATA PANGAEA
  • 8
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    Table 2. Radiocarbon ages of 4 sites from northwest Russia
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; Chelmokhta; ELEVATION; Event label; Latitude of event; Longitude of event; OUTCROP; Outcrop sample; Psaryovo; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped; Raibola; Sample, optional label/labor no; Sample code/label; Trepyzovo; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
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    DATA PANGAEA
  • 9
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    A large impact crater beneath Hiawatha Glacier in northwest Greenland (2018)
    In:  EPIC3Science Advances, 4(11), pp. eaar8173, ISSN: 2375-2548
    Details
    Publication Date: 2018-11-19
    Description: We report the discovery of a large impact crater beneath Hiawatha Glacier in northwest Greenland. From airborne radar surveys, we identify a 31-kilometer-wide, circular bedrock depression beneath up to a kilometer of ice. This depression has an elevated rim that cross-cuts tributary subglacial channels and a subdued central uplift that appears to be actively eroding. From ground investigations of the deglaciated foreland, we identify overprinted structures within Precambrian bedrock along the ice margin that strike tangent to the subglacial rim. Glaciofluvial sediment from the largest river draining the crater contains shocked quartz and other impact-related grains. Geochemical analysis of this sediment indicates that the impactor was a fractionated iron asteroid, which must have been more than a kilometer wide to produce the identified crater. Radiostratigraphy of the ice in the crater shows that the Holocene ice is continuous and conformable, but all deeper and older ice appears to be debris rich or heavily disturbed. The age of this impact crater is presently unknown, but from our geological and geophysical evidence, we conclude that it is unlikely to predate the Pleistocene inception of the Greenland Ice Sheet.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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