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Submarine landforms and ice-sheet flow in the Kvitøya 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, 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 Kvitøya 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 Kvitøya 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 Kvitøya 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 Kvitøya 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 14C 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.

Place, publisher, year, edition, pages
2010. Vol. 29, no 25-26, 3545-3562 p.
Keyword [en]
Arctic, Svalbard, glacial morphology, ice sheets
National Category
Earth and Related Environmental Sciences
Research subject
Geology
Identifiers
URN: urn:nbn:se:su:diva-47300DOI: 10.1016/j.quascirev.2010.08.015ISI: 000284724400015OAI: oai:DiVA.org:su-47300DiVA: diva2:373557
Available from: 2010-12-07 Created: 2010-11-30 Last updated: 2017-12-12Bibliographically approved

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Jakobsson, Martin
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