Abstract:
A transect of cores was taken from shelf to deep sea west of the Antarctic Peninsula off Marguerite Bay using a 12 m RVS piston corer, box corer and BGS vibrocorer deployed from RSS James Clark Ross cruise JR71 (12 days sea-time in 2001-2002). Successful coring and examination of sediments now on and immediately beneath the sea floor, which provided the deforming bed of the former ice stream, enhanced our understanding of conditions beneath ice streams.
Data was collected as part of a project was to reconstruct the Late Quaternary dynamics of the Antarctic Peninsula Ice Sheet in Marguerite Bay and to compare sedimentation and ice-rafted debris records with the Larsen Ice Shelf area, on the other side of the Antarctic Peninsula. The mapping of streamlined sedimentary bedforms on the outer shelf has allowed the dimensions of a former fast-flowing ice stream present at the Last Glacial Maximum to be defined. This, in turn, enabled estimates of the past magnitude of ice flow through this glacial system to be calculated.
Keywords:
Heinrich layers, box corer, ice drainage basin, ice stream, ice-rafted debris, piston corer
| Access Constraints: | Requests for data can be made via the UK Polar Data Centre (UK PDC) at BAS. |
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| Use Constraints: | This data is released under a UK Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3 |
| Creation Date: | 2007-11-13 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Name | Prof Julian Dowdeswell |
| Role(s) | Investigator |
| Name | Prof Colm O Cofaigh |
| Role(s) | Investigator |
| Organisation | Durham University |
| Parent Dataset: | N/A |
| Reference: | Dowdeswell, J.A., Ottesen, D., Evans, J., Ó Cofaigh, C. and Anderson, J.B., 2008. Submarine glacial landforms and rates of ice-stream collapse. Geology, v. 36, p. 819-822. Ó Cofaigh, C., Dowdeswell, J.A., Evans, J. and Larter, R.D., 2008. Geological constraints on Antarctic palaeo-ice stream retreat rates. Earth Surface Processes and Landforms, v. 33, p. 513-525. Ó Cofaigh, C., Evans, J., Dowdeswell, J.A. and Larter, R.D., 2007. Till characteristics, genesis and transport beneath Antarctic paleo-ice streams. Journal of Geophysical Research, v. 112, F03006, doi:101029/2006JF000606. Dowdeswell, J.A., 2006. Ice sheets and marine sedimentation on high-latitude continental margins. Blackwell. 30. Glacier Science and Environmental Change. Ó Cofaigh, C., Dowdeswell, J.A., Allen, C.S., Hiemstra, J., Pudsey, C.J., Evans, J. and Evans, D.J.A. 2005. Flow dynamics and till genesis associated with a marine-based Antarctic palaeo-ice stream. Quaternary Science Reviews. 24, 709-740. Dowdeswell, J.A., Ó Cofaigh, C. and Pudsey, C.J. 2004. Thickness and extent of the subglacial till layer beneath an Antarctic paleo-ice stream. Geology. 32, 13-16. Dowdeswell, J.A., Ó Cofaigh, C. and Pudsey, C.J. 2004. Continental slope morphology and sedimentary processes at the mouth of an Antarctic palaeo-ice stream. Marine Geology. 204, 203-214. Ó Cofaigh, C., Dowdeswell, J. A. and Pudsey, C. J. 2004. Sedimentation and Flow Dynamics Associated with a Marine-Based Antarctic Palaeo-Ice Stream. Antarctic Funding Initiative, Third Workshop, New Hall, Cambridge, 28-29 September 2004. Ó Cofaigh, C., Taylor, J., Dowdeswell, J.A. and Pudsey, C.J. 2003. Palaeo-ice streams, trough-mouth fans and high-latitude continental slope sedimentation. Boreas. 32, 37-55. Dowdeswell, J. A., Pudsey, C. J. and Ó Cofaigh, C. 2003. Geophysical and Geological Investigations of an Antarctic Peninsula Palaeo-Ice Stream. Antarctic Funding Initiative, Second Workshop, New Hall, Cambridge, 2-3 October 2003 Dowdeswell, J., Pudsey, C. and Ó Cofaigh, C. 2002. Ice Rafted Debris on the Antarctic Continental Margin and the Dynamics of the Antarctic Ice Sheet. Antarctic Funding Initiative [AFI], First Workshop, New Hall, Cambridge, 24 Sep 2002. AFI project: 02/48. Ice-rafted debris on the Antarctic continental margin and dynamics of the Antarctic Ice Sheet. |
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| Lineage: | ||
| Temporal Coverage: | |
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| Start Date | 2002-02-01 |
| End Date | 2002-03-01 |
| Paleo Temporal Coverage: | |
| Paleo Start Date | N/A |
| Paleo End Date | N/A |
| Chronostratigraphic Unit | QUATERNARY |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -68.5 |
| Northernmost | -66 |
| Longitude | |
| Westernmost | -72 |
| Easternmost | -69 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Southern Ocean |
| Detailed Location | Marguerite Bay |
| Sensor(s): |
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| Data Storage: | The sediment cores are stored at the British Ocean Core Repository, NOC BOSCORF, Southampton Oceanography Centre. The associated analysis data is managed by the UK Polar Data Centre (UK PDC) Geological Data Manager at the British Antarctic Survey (BAS). |
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