Aligned glaciotectonic rafts on the central Barents Sea seafloor revealing extensive glacitectonic erosion during the last deglaciation

Rüther, Denise Christina; Andreassen, Karin; Spagnolo, Matteo

doi:10.1002/2013gl058413

Cited by 27 publications

(14 citation statements)

References 24 publications

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“…According to the ICE‐5G model of ice sheet deglaciation, the contribution of the Eurasian (and British‐Irish) ice sheet to this event was in the region of 4.6 m of eustatic sea level rise [ Peltier , ]. Implications of this breakup on the BSIS include major deglaciation of shelf edge troughs by the end of MWP‐1A at 14.2 cal ka B.P., including the approximately 100 km long Kveithola trough [ Bjarnadóttir et al ., ; Rüther et al ., ].…”

Section: Chronologymentioning

confidence: 99%

Geophysical constraints on the dynamics and retreat of the Barents Sea ice sheet as a paleobenchmark for models of marine ice sheet deglaciation

Patton

Andreassen

Bjarnadóttir

et al. 2015

Reviews of Geophysics

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Our understanding of processes relating to the retreat of marine‐based ice sheets, such as the West Antarctic Ice Sheet and tidewater‐terminating glaciers in Greenland today, is still limited. In particular, the role of ice stream instabilities and oceanographic dynamics in driving their collapse are poorly constrained beyond observational timescales. Over numerous glaciations during the Quaternary, a marine‐based ice sheet has waxed and waned over the Barents Sea continental shelf, characterized by a number of ice streams that extended to the shelf edge and subsequently collapsed during periods of climate and ocean warming. Increasing availability of offshore and onshore geophysical data over the last decade has significantly enhanced our knowledge of the pattern and timing of retreat of this Barents Sea ice sheet (BSIS), particularly so from its Late Weichselian maximum extent. We present a review of existing geophysical constraints that detail the dynamic evolution of the BSIS through the last glacial cycle, providing numerical modelers and geophysical workers with a benchmark data set with which to tune ice sheet reconstructions and explore ice sheet sensitivities and drivers of dynamic behavior. Although constraining data are generally spatially sporadic across the Barents and Kara Seas, behaviors such as ice sheet thinning, major ice divide migration, asynchronous and rapid flow switching, and ice stream collapses are all evident. Further investigation into the drivers and mechanisms of such dynamics within this unique paleo‐analogue is seen as a key priority for advancing our understanding of marine‐based ice sheet deglaciations, both in the deep past and in the short‐term future.

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Section: Chronologymentioning

confidence: 99%

Geophysical constraints on the dynamics and retreat of the Barents Sea ice sheet as a paleobenchmark for models of marine ice sheet deglaciation

Patton

Andreassen

Bjarnadóttir

et al. 2015

Reviews of Geophysics

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“…The basemap was taken from the International Bathymetric Chart of the Arctic Ocean (IBCAO, version 3.0) (Jakobsson et al, 2012). Black and yellow arrows indicate previously inferred major ice stream directions (for early -blackand late -yellow phases of ice streaming) (Andreassen and Winsborrow, 2009;Rüther et al, 2013). Major ice domes (orange dashed lines) are suggested to have been located over NE Svalbard and Storbanken (Ottesen et al, 2005).…”

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confidence: 99%

“…Major ice domes (orange dashed lines) are suggested to have been located over NE Svalbard and Storbanken (Ottesen et al, 2005). Red dashed lines show reconstructed ice margin positions during deglaciation (Bjarnadóttir et al, 2013;Rüther et al, 2013;Winsborrow et al, 2010a). Gravity cores with minimum deglaciation ages for the downstream and upstream end of Bjørnøyrenna are marked with black dots.…”

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confidence: 99%

Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea

Piasecka

Winsborrow

Andreassen

et al. 2016

Quaternary Science Reviews

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. 20Our results reveal major changes in the configuration and flow dynamics of the ice stream, with up to 10 flow-switching events identified. For the first time, we also document ice streaming sourced from the eastern Barents Sea around the time of the LGM. This high degree of flow variability is suggested to have resulted from climate-driven changes in ice sheet geometry (and ice divide migration), and variations in topography that influenced calving at the ice stream terminus.2

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“…Measurements made from the 2D seismic profiles indicate that the dip of the individual thrusts, in general, decreases from north to south across the survey area (Table ) consistent with a forward (southerly) propagating imbricate thrust‐stack. The overall style of thrusting and folding within this thrust‐stack is consistent with ice‐marginal to proglacial deformation observed in other areas, both onshore (Aber, ; Pedersen, 1993, ; Bennett, ; Phillips et al ., ; Bakker, 2004; Andersen et al ., ; Benediktsson et al ., ; Phillips et al ., ) and offshore (Krzywiec et al ., ; Andreassen et al ., ; Ottesen et al ., ; Andreassen and Winsborrow, ; Buckley, 2012a,b; Rüther et al ., ; Huuse and Lykke‐Andersen, ,; Cotterill et al ., this issue). Furthermore, the decrease in length of the individual detached blocks from south to north across the thrust‐stack (Table ) is compatible with an increasing amount of shortening with the Aberdeen Ground Formation towards the proposed ice margin.…”

Section: Methodsmentioning

confidence: 99%

“…Ottesen et al ., ; Andreassen and Winsborrow, ), Barents Sea (e.g. Andreassen et al ., ; Rüther et al ., ) and North Sea (e.g. Huuse and Lykke‐Andersen, ,; Krzywiec et al ., ; Passchier et al ., ; Buckley, ,b).…”

Section: Introductionmentioning

confidence: 99%

Mid‐Pleistocene thin‐skinned glaciotectonic thrusting of the Aberdeen Ground Formation, Central Graben region, central North Sea

Vaughan-Hirsch

Phillips

2016

J Quaternary Science

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This paper presents the results of a high-resolution 2D seismic survey of Mid-Pleistocene glaciogenic sediments in the Central Graben region of the central North Sea. The survey has revealed that these sediments, which were originally interpreted as possessing a simple layercake stratigraphy, have in fact undergone major glaciotectonic thrusting and folding associated with the repeated southerly advance of an ice sheet across the region during the Mid-Pleistocene. The total observed length of the thrust-stacked section is approximately 5 to 6 km, comprising a series of discrete thrust slices, which range in length from < 300 m to > 700 m. The basal detachment of the thrust complex occurs at a depth of c. 220 m below sea bed within the upper Aberdeen Ground Formation. The ice-proximal limit of thrusting is marked by a large depression (>100 m deep, >1600 m wide) infilled by a sequence comprising at its base acoustically chaotic deposits, overlain by a well-bedded unit, passing upwards into tectonically deformed sediments. A thin-skinned glacitectonic model involving proglacial to ice-marginal glacitectonic thrusting followed by post-tectonic deposition is proposed. Initial ice advance led to the over-pressurising of groundwater within a laterally extensive sand sheet in the upper Aberdeen Ground Formation, promoting the formation of a major décollement surface at the base of the developing thrust stack. Detachment and transport of the thrusted sediments led to the contemporaneous formation of a "glacitectonic hollow" beneath the ice margin. Dewatering of the basal décollement, possibly due to water escaping from the thrusts which propagated upwards through the Aberdeen Ground, led to the cessation of forward propagation of the leading-edge of the thrust stack accompanied by extensive shortening and deformation at its ice-proximal end. Subsequent retreat of the ice exposed the tectonic hollow which became infilled with glacial outwash. This glacifluvial sequence was itself deformed during later readvance of the ice from the north. The proposed model provides clear evidence that Mid-Pleistocene ice sheet dynamics within the Central Graben of the North Sea was far more complex than previously thought.

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Aligned glaciotectonic rafts on the central Barents Sea seafloor revealing extensive glacitectonic erosion during the last deglaciation

Cited by 27 publications

References 24 publications

Geophysical constraints on the dynamics and retreat of the Barents Sea ice sheet as a paleobenchmark for models of marine ice sheet deglaciation

Geophysical constraints on the dynamics and retreat of the Barents Sea ice sheet as a paleobenchmark for models of marine ice sheet deglaciation

Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea

Mid‐Pleistocene thin‐skinned glaciotectonic thrusting of the Aberdeen Ground Formation, Central Graben region, central North Sea

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