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  • 11
    Electronic Resource
    Electronic Resource
    Late-and postglacial environments in the northern Barents Sea west of Franz Josef Land (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 13 (1994), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: A lithological and micropaleontological study of three sediment cores from the western Franz Josef Land area, two of them AMS l4C dated, provides new data on the environmental evolution of the northern Barents Sea during and after the last deglaciation. Glacimarine conditions commenced in the deep Franz Victoria Trough by 13 kyr BP. and then presumably propagated into adjacent inter-island channels of Franz Josef Land. Pulses of Atlantic-derived water occurred during deglaciation and could have accelerated ice-sheet decay. Normal marine environments were established close to 10 kyr BP. Ameliorated conditions are recorded for the interval of approximately 9.5 to 5 kyr BP. After that, more severe environments existed probably associated with heavier sea-ice cover.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1994.tb00449.x
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    Paper (German National Licenses)
    Fulltext
  • 12
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    Glaciomarine sedimentation in epicontinental seas exemplified by the northern Barents Sea (1989)
    Elsevier
    In:  Marine Geology, 85 (2-4). pp. 225-250.
    Details
    Publication Date: 2018-03-02
    Description: Sediments on high Arctic shelves result from modern processes and the effect of former glaciations. Based on data from the northern Barents Sea, an area with input from large and numerous surging glaciers, we define two principal zones with different environmental regimes and corresponding sedimentary facies: (1) a glacier-proximal zone influenced by grounding-line processes and the immediately adjacent areas affected by glacial sediment input, and (2) a glacier-distal, sea-ice and current-controlled zone, which also includes a wide sediment-starved region dominated by biogenic carbonate accumulation. Characteristic of the glacier-proximal zone are glacial surges which affect sedimentation rates and leave a diagnostic pattern of sea-floor morphologies. Extensive ice gouging causes a homogeneous sediment texture. In the glacier-distal zone, fine-grained mud supplied from sea ice and infrequent coarser material deposited from icebergs is reworked by modern oceanographic processes. On shallow banks, in 30–50 m of water, carbonates accumulate from a prolific bottom fauna formed in response to extensive reworking and nutrient supply.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0025-3227(89)90155-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 13
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    Quaternary sediments and bedrock geology in the outer Oslofjord and northernmost Skagerrak (1983)
    Brøgger
    In:  Norsk Geologisk Tidsskrift, 63 . pp. 55-72.
    Details
    Publication Date: 2020-06-22
    Description: Shallow seismic (sparker), magnetic and bathymetric profiling were carried out on two cruises in the outer Oslofjord in 1979 and 1980. The survey area is characterized by deep silled basins defined by the main structural trends of the surrounding land area. The Quaternary scdiments, largely restricted to these major basins, can bedivided into three main units of supposed pre-Weichselian to Holocene age. Most of the sediments were probably deposited during relatively short time intervals in the Late Weichselian underice-proximal conditions, and in the early Holocene. Magnetic total field and seismic data were used to map the submarine outlines of the Permo­-Carboniferous Vestfold la vas, the Permian sedimentary rocks and the Larvikite body. The presence of other intrusives in the eastern and southern part of the survey area is discussed.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 14
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    Subglacial meltwater discharge in the open-marine tidewater glacier environment: Observations from Nordaustlandet, Svalbard Archipelago (1989)
    Elsevier
    In:  Marine Geology, 86 (4). pp. 265-281.
    Details
    Publication Date: 2019-05-06
    Description: The ice-proximal environment of the Nordaustlandet tidewater ice cap, Svalbard Archipelago, is one of the best analogues for understanding glacial geologic processes of northern continental shelves during initial Pleistocene deglaciation. Investigations of the proglacial region in 1980–1983 showed that the sedimentary environment is dominated by numerous meltwater outflows which discharge sediment-laden water from subglacial meltwater streams during the summer. Two large, stable meltwater outflows were observed in embayments along the southern part of the ice front. Landsat images show that both outflows have been in approximately the same position since at least 1976. They are located at the intersection of glacial drainage basins and centered over depressions in the underlying bedrock. An “outflow valley” extending away from the ice front was observed in front of the western meltwater outflow. Sidescan sonar profiling along the glacier front showed a 200 m wide gap in acoustic reflection at the base of the western meltwater outflow, probably caused by meltwater effluence. Enhanced sediment accumulations in this region, observed as a ≈ 3 ms sediment drape in front of the outflow, and large arcuate ridges in the outflow valley, testify to the transport efficiency of the subglacial meltwater stream. Several mounds, up to about 25 m high and 200 m wide, are observed on sidescan and 3.5 kHz profiles directly in front of the outflow. Although samples from these structures are absent, they are most likely composed of sediment and are similar to beaded eskers observed in Pleistocene glacimarine sequences indicating locally very high sedimentation rates. Fine-grained components of the subglacial discharge incorporated in the buoyant meltwater plume are usually entrained in a westerly coastal current. Elevated suspended particulate material concentrations are observed within the coastal waters in a region extending about 15 km perpendicular to the glacier front and at least 60 km along the ice front extending into the northwestern Barents Sea.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/0025-3227(89)90089-3
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 15
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    Holocene sedimentary environments in Smeerenburgfjorden, Spitsbergen (2013)
    EGU
    In:  EPIC3EGU General Assembly 2013, 2013-04-07-2013-04-12Geophysical Research Abstracts, EGU
    Details
    Publication Date: 2022-09-29
    Description: Multi-proxy analyses of six sediment cores and analyses of swath bathymetry and chirp data were integrated to elucidate the Holocene sedimentary processes and palaeoenvironments in Smeerenburgfjorden, northwest Spits- bergen. Three basins separated by two sills define the present-day large-scale bathymetry. A transverse ridge in the innermost part of the fjord represents the Little Ice Age (LIA) maximum position of Smeerenburgbreen. Slide scars along the fjord sides and mass transport deposits in the basins indicate repeated mass wasting. Recessional moraines deposited during the last deglaciation suggest a mean annual retreat rate of 140 m/year. Another set of recessional moraines deposited between the maximum LIA position of Smeerenburgbreen and its present day ter- minus indicate a mean retreat rate of the ice front of ∼87 m/year. Strong out-fjord decreasing trends in magnetic susceptibility and Fe-content indicate that these properties are related to material originating from the Horneman- toppen granite in the catchment of Smeerenburgbreen and are, thus, useful proxies for the reconstruction of the activity of the glacier. Relatively little ice rafting, most likely related to warmer surface water conditions, occurred between 8650 and 7350 cal. years BP. Ice rafting from both sea-ice and icebergs increased around 6200 cal. years BP and peaked at ∼5200 cal. years BP, associated with a regional cooling. Smeerenburgbreen became more active around 2000 cal. years BP. It probably retreated during the Roman Warm Period (50 BC – AD 400) and advanced during the Dark Ages Cold Period (AD 400 – 800). From AD 1300 – 1500 (late Medieval Warm Period), ice rafting, sedimentation rates and productivity increased in the inner fjord. The Little Ice Age was characterised by reduced ice rafting, possibly linked to an increased sea-ice cover suppressing iceberg drift. An increase in Ice Rafted Debris (IRD) commencing around AD 1880 is suggested to represent the beginning of Smeerenburgbreen’s retreat from its LIA maximum towards its present position.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
  • 16
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    (Table 1) Age determination of sediment core 87-138
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: 24-Methylcholesta-5,22E-dien-3beta-ol per unit sediment mass; 87-138; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; DEPTH, sediment/rock; PC; Piston corer; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 4 data points
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    DATA PANGAEA
  • 17
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    Age determination of sediment cores off western Spitsbergen
    PANGAEA
    In:  Supplement to: Svendsen, John Inge; Mangerud, Jan; Elverhoi, Anders; Solheim, Anders; Schüttenhelm, Ruud TE (1992): The Late Weichselian glacial maximum on western Spitsbergen inferred from offshore sediment cores. Marine Geology, 104(1-4), 1-17, https://doi.org/10.1016/0025-3227(92)90081-R
    Details
    Publication Date: 2023-06-27
    Description: The Late Weichselian glacial history of the continental shelf off western Spitsbergen is discussed, based on acoustic sub-bottom records and sediment cores. The outer part of Isfjorden and the inner shelf to the west of this fjord are characterized by a thin veneer (10-20 m) of glacigenic sediments and absence of ice-marginal features. Towards the outer shelf the sediment thickness increases significantly, and exceeds 500 m at the shelf edge. Possible moraine complexes were identified in this outer part. Sediment cores from the inner shelf sampled a firm diamicton, interpreted as till, beneath soft glaciomarine sediments. Radiocarbon dates on shells from the clay resting directly on the till, suggest an age of around 12,500 yrs B.P. for the base of the marine sequence. We argue that grounded ice covered the sites shortly before. In contrast to suggestions that the fjords and coast were partly ice free during the Late Weischselian, we conclude that the ice must have reached out onto the continental shelf.
    Keywords: 87-137PC; 87-138; 87-144PC; 88-PCM-01; 88-PCM-2; 88-PCM-3; PC; Piston corer; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped
    Type: Dataset
    Format: application/zip, 6 datasets
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    DATA PANGAEA
  • 18
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    (Table 1) Age determination on sediment core 87-137PC
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 87-137PC; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; DEPTH, sediment/rock; PC; Piston corer; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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    DATA PANGAEA
  • 19
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    (Table 1) Age determination on sediment core 88-PCM-01
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 88-PCM-01; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; DEPTH, sediment/rock; PC; Piston corer; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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    DATA PANGAEA
  • 20
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    (Table 1) Age determination on sediment core 88-PCM-2
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 88-PCM-2; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; DEPTH, sediment/rock; PC; Piston corer; Quaternary Environment of the Eurasian North; QUEEN; QUEEN_Exped; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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    DATA PANGAEA
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