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Submarine landforms and ice-sheet flow in the Kvitoya Trough, northwestern Barents Sea
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2010 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 29, no 25-26, SI, 3545-3562 p.Article in journal (Refereed) Published
Abstract [en]

High-resolution geophysical and sediment core data are used to investigate the pattern and dynamics of former ice flow in Kvitoya Trough, northwestern Barents Sea. A new swath-bathymetric dataset identifies three types of submarine landform in the study area (streamlined landforms, meltwater channels and cavities, iceberg scours). Subglacially produced streamlined landforms provide a record of ice flow through Kvitoya Trough during the last glaciation. Flow directions are inferred from the orientations of streamlined landforms (drumlins, crag-and-tail features). Ice flowed northward for at least 135 km from an ice divide at the southern end of Kvitoya Trough. A large channel-cavity system incised into bedrock in the southern trough indicates that subglacial meltwater was present at the former ice-sheet base. Modest landform elongation ratios and a lack of mega-scale glacial lineations suggest that, although ice in Kvitoya Trough was melting at the bed and flowed faster than the likely thin and cold-based ice on adjacent banks, a major ice stream probably did not occupy the trough. Retreat was relatively rapid after 14-13.5 C-14 kyr B.P. and probably progressed via ice sheet-bed decoupling in response to rising sea level. There is little evidence for still stands during ice retreat or of ice-proximal deglacial sediments. Relict iceberg scours in present-day water depths of more than 350 m in the northern trough indicate that calving was an important mass loss mechanism during retreat. (C) 2010 Elsevier Ltd. All rights reserved.

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2010. Vol. 29, no 25-26, SI, 3545-3562 p.
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Natural Sciences
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URN: urn:nbn:se:polar:diva-3075DOI: 10.1016/j.quascirev.2010.08.015OAI: oai:DiVA.org:polar-3075DiVA: diva2:1044951
Available from: 2016-11-07 Created: 2016-10-27 Last updated: 2016-11-07

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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