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Durham Research Online Durham Research Online Deposited in DRO: 18 February 2015 Version of attached le: Published Version Peer-review status of attached le: Peer-reviewed Citation for published item: Margold, M. and Stokes, C.R. and Clark, C.D. (2015) 'Ice streams in the Laurentide Ice Sheet : identication, characteristics and comparison to modern ice sheets.', Earth-science reviews., 143 . pp. 117-146. Further information on publisher's website: http://dx.doi.org/10.1016/j.earscirev.2015.01.011 Publisher's copyright statement: c 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) Additional information: Use policy The 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. Durham University Library, Stockton Road, Durham DH1 3LY, United Kingdom Tel : +44 (0)191 334 3042 | Fax : +44 (0)191 334 2971 https://dro.dur.ac.uk Earth-Science Reviews 143 (2015) 117–146 Contents lists available at ScienceDirect Earth-Science Reviews journal homepage: www.elsevier.com/locate/earscirev Ice streams in the Laurentide Ice Sheet: Identification, characteristics and comparison to modern ice sheets Martin Margold a,⁎,ChrisR.Stokesa, Chris D. Clark b a Durham University, Department of Geography, Lower Mountjoy, South Road, Durham DH1 3LE, UK b University of Sheffield, Department of Geography, Western Bank, Sheffield S10 2TN, UK article info abstract Article history: This paper presents a comprehensive review and synthesis of ice streams in the Laurentide Ice Sheet (LIS) based Received 11 August 2014 on a new mapping inventory that includes previously hypothesised ice streams and includes a concerted effort to Accepted 23 January 2015 search for others from across the entire ice sheet bed. The inventory includes 117 ice streams, which have been Available online 8 February 2015 identified based on a variety of evidence including their bedform imprint, large-scale geomorphology/ topography, till properties, and ice rafted debris in ocean sediment records. Despite uncertainty in identifying Keywords: Ice streams ice streams in hard bedrock areas, it is unlikely that any major ice streams have been missed. During the Last Laurentide Ice Sheet Glacial Maximum, Laurentide ice streams formed a drainage pattern that bears close resemblance to the present Glacial landform record day velocity patterns in modern ice sheets. Large ice streams had extensive onset zones and were fed by multiple Deglaciation tributaries and, where ice drained through regions of high relief, the spacing of ice streams shows a degree of Ice sheet dynamics spatial self-organisation which has hitherto not been recognised. Topography exerted a primary control on the Ice velocity pattern location of ice streams, but there were large areas along the western and southern margin of the ice sheet where the bed was composed of weaker sedimentary bedrock, and where networks of ice streams switched direction repeatedly and probably over short time scales. As the ice sheet retreated onto its low relief interior, several ice streams show no correspondence with topography or underlying geology, perhaps facilitated by localised build-up of pressurised subglacial meltwater. They differed from most other ice stream tracks in having much lower length-to-width ratios and have no modern analogues. There have been very few attempts to date the initiation and cessation of ice streams, but it is clear that ice streams switched on and off during deglaciation, rather than maintaining the same trajectory as the ice margin retreated. We provide a first order estimate of changes in ice stream activity during deglaciation and show that around 30% of the margin was drained by ice streams at the LGM (similar to that for present day Antarctic ice sheets), but this decreases to 15% and 12% at 12 cal ka BP and 10 cal ka BP, respectively. The extent to which these changes in the ice stream drainage network represent a simple and predictable readjustment to a changing mass balance driven by climate, or internal ice dynamical feedbacks unrelated to climate (or both) is largely unknown and represents a key area for future work to address. © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Contents 1. Introduction.............................................................. 118 2. HistoricalperspectiveonicestreamsintheLIS.............................................. 119 3. TypesofevidenceforLaurentideicestreams............................................... 123 4. AnupdatedinventoryofLaurentideicestreams............................................. 125 4.1. CanadianArcticArchipelago................................................... 125 4.2. InteriorPlains.......................................................... 127 4.3. GreatLakes........................................................... 129 4.4. Atlanticseaboard........................................................ 129 4.5. CanadianShield......................................................... 130 5. Discussion.............................................................. 131 5.1. TowhatextenthavealloftheLISicestreamsbeenfound?..................................... 131 ⁎ Corresponding author. Tel.: +44 19133 41829; fax: +44 191 33 41801. E-mail address: [email protected] (M. Margold). http://dx.doi.org/10.1016/j.earscirev.2015.01.011 0012-8252/© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). 118 M. Margold et al. / Earth-Science Reviews 143 (2015) 117–146 5.2. Sizeandshapeandcomparisontomodernicestreams....................................... 133 5.3. Marineversusterrestrialicestreams................................................ 134 5.4. Controlsonicestreamlocation.................................................. 135 5.4.1. Topographicsteering.................................................. 135 5.4.2. Calvingicefront..................................................... 135 5.4.3. Geologyofthebed................................................... 136 5.4.4. Meltwateratthebed.................................................. 136 5.4.5. Macro-scale bed roughness, geothermal heat flux,andtransversetopographicsteps...................... 136 5.4.6. Summary........................................................ 137 5.5. Whendidtheicestreamsoperate?................................................ 137 5.6. Stabilityoficedrainagenetwork................................................. 138 5.7. Whatroledidicestreamsplayinicesheetmassbalanceduringdeglaciation?............................. 139 5.8. Futurework........................................................... 140 6. Conclusions.............................................................. 141 Acknowledgements............................................................. 141 AppendixA. Supplementarydata...................................................... 141 References................................................................. 141 1. Introduction large distances and knowledge of mineral dispersal patterns is econom- ically important for the mining industry (e.g., Klassen, 1997). Ice sheets lose mass through melting or dynamically through dis- A large number of palaeo-ice streams have been described for the charge via rapidly-flowing ice streams/outlet glaciers. Recent studies of Laurentide Ice Sheet (LIS; Fig. 2), the largest of the ephemeral Northern ice sheet velocity patterns have revealed an intricate network in Hemisphere ice sheets, covering the territory of present day Canada Antarctica (Joughin et al., 1999; Rignot et al., 2011b) and Greenland from the Cordillera to the Arctic and Atlantic oceans, with large lobes ex- (Joughin et al., 2010b), with major ice stream trunks fed by smaller trib- tending to the north-eastern part of the present day United States utaries that extend far into the ice sheet interior (Fig. 1). These ice (Denton and Hughes, 1981; Winsborrow et al., 2004). Ice streams streams account for approximately 90% of mass loss in Antarctica draining the LIS into the North Atlantic have also been identified as a (Bamber et al., 2000) and approximately 50% in Greenland (van den source of ice rafted debris (IRD) found in the ocean sedimentary record Broeke et al., 2009). They typically exhibit flow velocities of the order (Bond et al., 1992). These layers of IRD on the ocean floor have been of hundreds of m a−1, increasing towards several km a−1 towards interpreted to document periods of significant dynamic mass loss from some of their termini (Joughin et al., 2010b; Rignot et al., 2011b). The the Pleistocene ice sheets of the Northern Hemisphere (Heinrich events; rapid velocity and low surface gradient that characterise some ice Heinrich, 1988; Andrews, 1998), particularly, but not exclusively, in the streams result from a weak bed of saturated, fine-grained sediments vicinity of the Hudson Strait Ice Stream (MacAyeal, 1993; Andrews and that cannot
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