Recent glacially influenced sedimentary processes on the East Greenland continental slope and deep Greenland Basin

García, Marga; Dowdeswell, Julian A.; Ercilla, Gemma; Jakobsson, Martin

doi:10.1016/j.quascirev.2012.06.016

Cited by 26 publications

(41 citation statements)

References 78 publications

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“…At their distal ends, sandy channel-mouth lobes have been recorded in such deep-ocean basins (e.g. Dowdeswell et al 2002;Ó Cofaigh et al 2004;García et al 2012García et al , 2016). Turbiditycurrent channels can be up to hundreds of kilometres long and several kilometres wide, reaching over 100 m deep, with extensive levees beyond formed by flow-stripping and overspill (Fig.…”

Section: Other Submarine Landforms On High-latitude Marginsmentioning

confidence: 99%

“…Chough & Hesse 1976;Hesse et al 1987;Mienert et al 1993;Wilken & Mienert 2006;García et al 2016). Dating of calcareous microfossils in the levees of the major submarine-channel system of the Greenland Basin, offshore of East Greenland, demonstrates that most activity is full-glacial, suggesting that the presence of ice at or close to the shelf edge is important to the supply of debris in relatively dense downslope flows (Ó Cofaigh et al 2004;García et al 2012García et al , 2016. Where submarine channels are located beyond ice streams on relatively steep continental slopes, they typically become efficient bypass systems for the delivery of debris to deep-ocean basins (e.g.…”

Section: Other Submarine Landforms On High-latitude Marginsmentioning

confidence: 99%

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The variety and distribution of submarine glacial landforms and implications for ice-sheet reconstruction

Dowdeswell

Canals

Jakobsson

et al. 2016

Memoirs

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Glacimarine processes affect about 20% of the global ocean today, and this area expanded considerably under cyclical full-glacial conditions during the Quaternary (Fig. 1) . Many of the submarine landforms produced at the base and margin of past ice sheets remain well preserved on the seafloor in fjords and on high-latitude continental shelves after the retreat of the ice that produced them. These glacial landforms, protected from subaerial erosion and beneath wave-base and tidal currents in water that is often hundreds of metres deep, are gradually buried by both hemipelagic and glacimarine sedimentation; they may be preserved over long periods in the geological record if palaeocontinental shelves are not reworked by subsequent glacier advances or bottom currents ). This means that, first, submarine glacial landforms can be observed at or close to the modern seafloor after retreat of the last great ice sheets from their most recent Quaternary maximum about 18-20 000 years ago using swath-bathymetric mapping systems and, secondly, buried glacial landforms may also be identified and examined within glacial-sedimentary sequences from Quaternary and earlier ice ages using seismic-reflection methods.The development of multibeam echo sounding over the past two decades, coupled with high-accuracy GPS positioning, has allowed morphological mapping of the seafloor at an unprecedented level of detail. In this paper, the variety of submarine glacial landforms observed in modern, Quaternary and more ancient sediments is described. Landforms produced subglacially, those formed at and beyond marine ice-sheet margins, together with the slope processes and bottom currents likely to result in their reworking, are considered along with the sediment volumes of these landforms and the time they take to develop. This is followed by discussion of the significance of submarine glacial landforms and landform-assemblages for reconstruction of the form and flow of past ice sheets, including the former extent and flow direction of ice sheets, whether they are flowing fast as ice streams or slowly in inter-ice stream areas, the nature and rate of ice-sheet deglaciation, conditions at past ice-sheet beds, and inferences on the characteristics of the basal hydrological system and past climatic conditions.

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Section: Other Submarine Landforms On High-latitude Marginsmentioning

confidence: 99%

Section: Other Submarine Landforms On High-latitude Marginsmentioning

confidence: 99%

The variety and distribution of submarine glacial landforms and implications for ice-sheet reconstruction

Dowdeswell

Canals

Jakobsson

et al. 2016

Memoirs

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“…Sediment cores and seismic facies in the deep sea reveal that gravity flows and hemipelagic settling are the main transfer mechanisms to these sinks (Figs. 1 and 11;Dowdeswell et al, 1996;Dowdeswell et al, 1998;Wilken and Mienert, 2006;Reece et al, 2011;Cofaigh, 2012;Garcia et al, 2012;Walton et al, 2014). Debris flows are ubiquitous on continental slopes seaward of cross-shelf troughs that were occupied by ice streams (Figs.…”

Section: Linking the Source To The Sink: Glacigenic Signal Transfermentioning

confidence: 99%

“…Deposition of debrites results in the formation of trough mouth fans, the primary depositional landform on many northern hemisphere margins Dahlgren et al, 2002;Elverhøi et al, 2002;Taylor et al, 2002a;Cofaigh et al, 2003;Dahlgren et al, 2005;Nielsen et al, 2005;Rebesco et al, 2014). Trough mouth fans occur wherever slopes are b4° (Cofaigh et al, 2003;; on steeper slopes, gravity flows supply sediment to deep submarine basins via large submarine channels (Dobson et al, 1998;Reece et al, 2011;Garcia et al, 2012;Walton et al, 2014). Although gravity flows transfer large volumes of glacigenic sediment onto slopes and into deepwater basins (Reece et al, 2011;Garcia et al, 2012;Walton et al, 2014), suspended sediment settling from turbid surface and intermediate water depth plumes dominates the temporal record in these settings (Taylor et al, 2002c).…”

Section: Linking the Source To The Sink: Glacigenic Signal Transfermentioning

confidence: 99%

The role of the cryosphere in source-to-sink systems

Jaeger

Koppes

2016

Earth-Science Reviews

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“…However, Clausen (1998) (García et al, 2012). In these areas, however, turbidity currents are inferred to form sediment 567 waves or sediment mounds on the lower slope, probably as a consequence of the lower slope 568 velocities caused by a gradient decrease.…”

Section: High-gradient Trough Mouth Fans In Other Areas 517mentioning

confidence: 98%

Seabed morphology and sedimentary processes on high-gradient trough mouth fans offshore Troms, northern Norway

2015

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9Trough mouth fans (TMF) situated at the mouths of formerly glaciated cross-shelf troughs are 10 important palaeoclimatic archives. Whereas the sedimentary processes of large, low-gradient 11TMFs have received considerable interest, little attention has been paid to the other end 12 member of this landform class, i.e. TMFs with higher slope gradients. Detailed swath-13 bathymetric data and seismic profiles from the continental margin offshore Troms, northern 14

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Recent glacially influenced sedimentary processes on the East Greenland continental slope and deep Greenland Basin

Cited by 26 publications

References 78 publications

The variety and distribution of submarine glacial landforms and implications for ice-sheet reconstruction

The variety and distribution of submarine glacial landforms and implications for ice-sheet reconstruction

The role of the cryosphere in source-to-sink systems

Seabed morphology and sedimentary processes on high-gradient trough mouth fans offshore Troms, northern Norway

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