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New Quaternary sedimentary records from near the Larsen C and former Larsen B ice shelves; evidence for Holocene stability

Published online by Cambridge University Press:  29 June 2007

Philip Curry  and
Carol J. Pudsey
Philip Curry*
Affiliation:
Department of Geography, University of Cambridge, Cambridge, UK
Carol J. Pudsey
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
*
philipxcurry@yahoo.co.uk
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Abstract

Glacial and post-glacial shelf sedimentation near the Larsen C and former Larsen B ice shelves is compared to records from ice shelves farther north, which underwent mid-Holocene retreat. A core from Larsen C comprises a lower unit of deformation till, overlain by thick mud interpreted as water lain from suspension under the ice shelf. Iceberg-rafted debris occurs only in the top 50 cm, suggesting that prior to that layer's deposition, the ice shelf had not receded past the site since the last deglaciation. Subsequently the site appears to have been seasonally ice free, and the ice shelf has retreated further and is now 15 km landward of the site. A core from Larsen B also consists of a lower unit, interpreted as sub-glacial lodgement till. The overlying mud is thinner, more poorly sorted, with evidence of powerful winnowing of sediments suggesting strong currents. The absence of iceberg-rafted debris implies that this site was covered by an ice shelf continuously from the last deglaciation until its collapse in 2002. Strong currents could have facilitated basal erosion, contributing to its collapse. The Larsen C shelf is also thinning and historical records show retreat in the last hundred years. With continued rising temperatures, Larsen C may eventually retreat to a point at which it collapses.

Keywords

basal erosionbasal freezingHolocene retreatice shelf collapsemeltwater
Type
Earth Sciences
Information
Antarctic Science , Volume 19 , Issue 3 , September 2007 , pp. 355 - 364
Copyright
Copyright © Antarctic Science Ltd 2007

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References

Anderson, J.B. 1999. Antarctic marine geology. Cambridge: Cambridge University Press, 289 pp.CrossRefGoogle Scholar
Brachfeld, S., Domack, E., Kissel, C., Laj, C., Leventer, A., Ishman, S., Gilbert, R., Camerlenghi, A. & Eglinton, L.B. 2003. Holocene history of the Larsen A ice shelf constrained by geomagnetic palaeointensity dating. Geology, 31, 749–752.CrossRefGoogle Scholar
Clapperton, C.M. & Sugden, D.E. 1982. Late Quaternary glacial history of George VI Sound area, West Antarctica. Quaternary Research, 18, 243–267.CrossRefGoogle Scholar
Cook, A.J., Fox, A.J., Vaughan, D.G. & Ferrigno, J.G. 2005. Retreating glacier fronts on the Antarctic Peninsula over the past half-century. Science, 308, 541–545.CrossRefGoogle ScholarPubMed
Cooper, A.P.R. 1997. Historical observations of Prince Gustav Ice Shelf. Polar Record, 33, 285–294.CrossRefGoogle Scholar
del Valle, R.A., Lusky, J.C. & Roura, R. 1998. Glacial trough under Larsen Ice Shelf, Antarctic Peninsula. Antarctic Science, 10, 173–174.CrossRefGoogle Scholar
Domack, E.W., Duran, D., Leventer, A., Ishman, S., Doane, S., McCallum, S., Amblas, D., Ring, J., Gilbert, R. & Prentice, M. 2005. Stability of the Larsen B ice shelf on the Antarctic Peninsula during the Holocene epoch. Nature, 436, 681–685.CrossRefGoogle Scholar
Drewry, D.J. & Cooper, A.P.R. 1981. Processes and models of Antarctic glaciomarine sedimentation. Annals of Glaciology, 2, 117–122.CrossRefGoogle Scholar
Elverhøi, A., Lonne, O. & Seland, R. 1983. Glacimarine sedimentation in a modern fjord environment. Polar Research, 1, 127–149.CrossRefGoogle Scholar
Evans, J. & Pudsey, C.J. 2002. Sediment facies of Antarctic Peninsula ice shelves: implications for palaeoenvironmental reconstructions of glacimarine sediments. Journal of the Geological Society, 159, 233–237.CrossRefGoogle Scholar
Evans, J., Pudsey, C.J., O'Cofaigh, C., Morris, P. & Domack, E.W. 2005. Late Quaternary glacial history, flow dynamics and sedimentation along the eastern margin of the Antarctic Peninsula Ice Sheet. Quaternary Science Reviews, 24, 741–774.CrossRefGoogle Scholar
Ferrigno, J.G., Cook, A.J., Foley, K.M., Williams, R.S. Jr, Swithinbank, C., Fox, A.J., Thomson, J.W. & Sievers, J. In press a. Coastal change and glaciological maps of the Trinity Peninsula area, Antarctica: 1843–2002 (USGS map number I-2600-A).Google Scholar
Ferrigno, J.G., Cook, A.J., Foley, K.M., Williams, R.S. Jr, Swithinbank, C., Fox, A.J., Thomson, J.W. & Sievers, J. In press b. Coastal change and glaciological maps of the Larsen Ice Shelf area, Antarctica: 1940–2002 (USGS map number I-2600-B).Google Scholar
Fleet, M. 1968. The geology of the Oscar II coast, Graham Land. British Antarctic Survey Scientific Reports, No. 59, 46 pp.Google Scholar
Fleming, E.A. & Thomson, J.W., eds. 1979. Northern Graham Land and South Shetland Islands. Geological map, 1: 500000, BAS 500G series Sheet 2, edition 1. Cambridge: British Antarctic Survey.Google Scholar
Hemer, M.A. & Harris, P.T. 2003. Sediment core from beneath the Amery Ice Shelf, East Antarctica, suggests mid-Holocene ice-shelf retreat. Geology, 31, 127–130.2.0.CO;2>CrossRefGoogle Scholar
Ingolfsson, O., Hjört, C., Björck, S. & Lewis Smith, R.I. 1992. Late Pleistocene and Holocene glacial history of the James Ross Island, Antarctic Peninsula. Boreas, 157, 209–222.CrossRefGoogle Scholar
Jenkins, A. & Doake, C.S.M. 1991. Ice-ocean interaction on Ronne Ice Shelf, Antarctica. Journal of Geophysical Research, 96, 791–813.CrossRefGoogle Scholar
MacAyeal, D.R., Scambos, T.A., Hulbe, L.C. & Fahnestock, M. 2003. Catastrophic ice shelf breakup by an ice shelf fragment capsize mechanism. Journal of Glaciology, 49, 22–36.CrossRefGoogle Scholar
Mackensen, A., Grobe, H., Kuhn, G. & Futterer, D.K. 1990. Benthic foramineral assemblages from the eastern Weddell Sea between 68 and 73°S: distribution, ecology and fossilisation potential. Marine Micropaleontology, 16, 1–43.CrossRefGoogle Scholar
Marsh, A.F. 1968. Geology of parts of the OSCAR II and Foyn coasts, Graham Land. PhD thesis, University of Birmingham, 291 pp. [Unpublished].Google Scholar
Morris, E.M. & Vaughan, D.G. 2003. Spatial and temporal variation of surface temperature on the Antarctic Peninsula and the limit of viability of ice shelves. Antarctic Research Series, 79, 61–68.Google Scholar
Murray, J.W. & Pudsey, C.J. 2005. Living (stained) and dead foraminifera from the newly ice-free Larsen Ice Shelf, Weddell Sea, Antarctica: ecology and taphonomy. Marine Micropaleontology, 53, 67–81.CrossRefGoogle Scholar
O'Cofaigh, C., Dowdeswell, J.A. & Grobe, H. 2001. Holocene glacimarine sedimentation, inner Scoresby Sund, East Greenland: the influence of fast-flowing ice-sheet outlet glaciers. Marine Geology, 175, 103–129.CrossRefGoogle Scholar
Pedley, M., Paren, J.G. & Potter, J.R. 1988. Localised freezing within George VI Ice Shelf, Antarctica. Journal of Glaciology, 34, 71–77.CrossRefGoogle Scholar
Powell, R.D. 1984. Glacimarine processes and inductive lithofacies modelling of ice shelf and tidewater glacier sediments based on Quaternary examples. Marine Geology, 57, 1–52.CrossRefGoogle Scholar
Powell, R.D. & Molnia, B.F. 1989. Glacimarine sedimentary processes, facies and morphology of the south–southeast Alaska shelf and fjords. Marine Geology, 85, 359–390.CrossRefGoogle Scholar
Pudsey, C.J. et al. 2002 Cruise Report RRS James Clark Ross, Cruise JR 71. Cambridge: British Antarctic Survey, 66 pp. [Unpublished]Google Scholar
Pudsey, C.J. & Evans, J. 2001. First survey of Antarctic sub-ice shelf sediments reveals mid-Holocene ice shelf retreat. Geology, 29, 787–790.2.0.CO;2>CrossRefGoogle Scholar
Pudsey, C.J., Evans, J., Domack, E.W., Morris, P. & del Valle, R.A. 2001. Bathymetry and acoustic facies beneath the former Larsen A and Prince Gustav ice shelves, NW Weddell Sea. Antarctic Science, 13, 312–322.CrossRefGoogle Scholar
Saunders, A.D. 1978. The King Oscar II, Foyn and Bowman coasts, Graham Land. Interim geological report, Summer Field Season 1977–78. (BAS archives No. AD6/2R/G2/1977) 10 pp. [Unpublished]Google Scholar
Scambos, E., Hulbe, C. & Fahnestock, M. 2003. Climate induced ice shelf disintegration in the Antarctic Peninsula. Antarctic Research Series, 79, 79–92.Google Scholar
Shepherd, A., Wingham, D., Payne, T. & Skvarca, P. 2003. Larsen Ice Shelf has progressively thinned. Science, 302, 856–859.CrossRefGoogle ScholarPubMed
Skvarca, P. & De Angelis, H. 2003. Impact assessment of regional climatic warming on glaciers and ice shelves of the north eastern Antarctic Peninsula. Antarctic Research Series, 79, 69–78.Google Scholar
Skvarca, P., Rack, W., Rott, H. & Ibarzabal y Donangelo, T. 1999. Climatic trend and the retreat and disintegration of ice shelves on the Antarctic Peninsula: an overview. Polar Research, 18, 151–157.CrossRefGoogle Scholar
Sloan, B.J., Lawver, L.A. & Anderson, J.B. 1995. Seismic stratigraphy of the Larsen Basin, eastern Antarctic Peninsula. Antarctic Research Series, 68, 59–74.Google Scholar
Thomson, J.W. & Harris, A.S. 1979. Southern Graham Land. Geological map, 1: 500 000, BAS 500G series Sheet 3, edition 1. Cambridge: British Antarctic Survey.Google Scholar
Vaughan, D.G. & Doake, C.S.M. 1996. Recent atmospheric warming and retreat of ice shelves on the Antarctic Peninsula. Nature, 379, 328–331.CrossRefGoogle Scholar
Vaughan, D.G., Marshall, G.J., Connolley, W.M., King, J.C. & Mulvaney, R. 2001. Devil in the detail. Science, 293, 1777–1779.CrossRefGoogle ScholarPubMed
Zotikov, I.A., Zagorodnov, V.S. & Raikovsky, J.V. 1980. Core drilling through the Ross Ice Shelf (Antarctica) confirmed basal freezing. Science, 207, 1463–1465.CrossRefGoogle ScholarPubMed