Journal
JOURNAL OF QUATERNARY SCIENCE
Volume 32, Issue 4, Pages 463-474Publisher
WILEY
DOI: 10.1002/jqs.2939
Keywords
grounding line proximal sedimentation; ice stream dynamics; late Weichselian deglaciation; mega-scale glacial lineations; northern Barents Sea
Funding
- Research Council of Norway through its Centres of Excellence [223259]
- Det norske oljeselskap ASA
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Geomorphological evidence suggests that ice streams undergo frequent dynamic changes towards the end of their life cycles, but the associated sedimentary characteristics and processes remain poorly understood. Here, we present new sedimentological data from a Late Weichselian marine-based ice stream in upper BjOrnOyrenna, northern Barents Sea, which experienced accelerated flow, intense calving of large icebergs, ice stream stagnation, ice shelf formation and disintegration. Observed till characteristics support the idea of spatially and temporally variable basal drag underneath ice streams. In addition, fast flow may have been accommodated in dilatant deforming till as well as through basal sliding over sticky spots of stiffer till. The grounding zone is shown to be highly transient and spatially variable during the final ice stream readvances, thus making the categories subglacial/proglacial of little value. In line with previous radiocarbon dates, we find that uppermost BjOrnOyrenna was deglaciated before approximate to 11.3-12.0k cal a BP. Finally, the provenances for the latest ice stream advance and an older ice flow event are inferred based on a novel way of using element geochemistry, helping define ice dome configuration in the northern Barents Sea.
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