Readvance of the last British–Irish Ice Sheet during Greenland Interstade 1 (GI-1): the Wester Ross Readvance,NW Scotland |
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| Authors: | Colin K. Ballantyne Christoph Schnabel Sheng Xu |
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| Affiliation: | 1. School of Geography and Geosciences, University of St Andrews, St Andrews, Fife KY16 9AL, Scotland, UK;2. NERC Cosmogenic Isotope Analysis Facility, SUERC, East Kilbride, Scotland, UK;3. Scottish Universities Environmental Research Centre (SUERC), East Kilbride, Scotland, UK;1. Department of Physics, University of Ottawa, Canada;2. Department of Earth Sciences, University of Ottawa, Canada;3. Geodetic Institute, Norwegian Mapping Authority, Hønefoss, Norway;4. Department of Geography, University of Northumbria, UK;5. Vrije Universiteit Brussel, Belgium;6. Department of Physics and Physical Oceanography, Memorial University, Canada;7. Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Denmark;8. Department of Geography, Durham University, UK;9. Geological Survey of Canada, NRCan, Canada;10. Department of Geography, Memorial University, Canada;11. Department of Geoscience, Aarhus University, Denmark;1. Centre for Quaternary Research, Department of Geography, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom;2. Durham University, Department of Geography, Science Laboratories, South Road, Durham DH1 3LE, United Kingdom;3. Department of Archaeology, The Kings Manor, University of York, York YO1 7EP, United Kingdom;4. Archaeology (SAHC), University of Manchester, Mansfield Cooper Building, Oxford Road, Manchester M13 9PL, United Kingdom;5. Department of Archaeology, University of Chester, Parkgate Road, Chester CH1 4BJ, United Kingdom;1. Department of Earth Science, University of Bergen, N-5007 Bergen, Norway;2. Department of Geography, University of Sheffield, Sheffield S10 2TN, UK;3. British Geological Survey, Keyworth, Nottingham NG12 5GG, UK;1. Department of Geography, Royal Holloway University of London, Egham, Surrey, TW20 OEX, United Kingdom;2. School of Geography, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire, LS2 9JT, United Kingdom;3. British Geological Survey, Keyworth, Nottingham, NG12 5GG, United Kingdom |
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| Abstract: | Fourteen samples obtained from Torridon sandstone boulders on four moraines marking the limit of the Wester Ross Readvance (WRR) in NW Scotland yielded tightly clustered 10Be exposure ages confirming contemporaneous or penecontemporaneous moraine deposition. Collectively, the 14 samples yield mean ages of 13.5 ± 1.2 ka to 14.0 ± 1.7 ka, depending on choice of geomagnetic scaling and sampling surface erosion rates. All fourteen moraine ages are significantly younger than an age of ca 16.3 ka previously proposed for the WRR, and also younger than most samples obtained from rock outcrops within the WRR limits. The ages obtained for the WRR moraines appear to confirm that a substantial cover of glacier ice persisted over low ground in NW Scotland during at least the early part of the Lateglacial Interstade (≈Greenland Interstade 1). We infer that the WRR probably occurred in response to rapid short-lived cooling during the Older Dryas climatic reversal (≈Greenland Interstade 1d), though the possibilities that the WRR represents ice-margin response to a later climatic reversal during the Lateglacial Interstade or stabilization and readvance of the ice margin following rapid offshore calving cannot be discounted. |
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