A new varve thickness record from Allt Bhraic Achaidh Fan,middle Glen Roy,Lochaber: implications for understanding the Loch Lomond Stadial glaciolacustrine varve sedimentation trends |
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| Institution: | 1. Department of Geography, College of Science, Swansea University, Singleton Park, Abertawe, Cymru SA2 8PP, UK;2. British Geological Survey, Cardiff University, Main Building, Park Place, Caerdydd, Cymru CF10 3AT, UK;3. Natural Resources Wales, Maes Newydd, Britannic Way West, Llandarcy, Neath Port Talbot, Cymru SA10 6JQ, UK;1. Research Laboratory for Archaeology and the History of Art, School of Archaeology, University of Oxford, 1 South Parks Road, Oxford, OX1 3TG, UK;2. Scottish Universities Environmental Research Centre, University of Glasgow, Rankine Avenue, East Kilbride, South Lanarkshire, G75 0QF, UK;3. Isotope Climatology and Environmental Research Center (ICER), Institute for Nuclear Research, Hungarian Academy of Sciences, H-4026, Debrecen, Bem tér 18/c, Hungary;4. Eötvös Lóránd University, MTA-MTM-ELTE Research Group for Paleontology, Department of Environmental and Landscape Geography, Pázmány P. stny. 1/C, H-1117, Budapest, Hungary;5. Romanian Academy, Institute of Speleology, Clinicilor 5, 400006, Cluj-Napoca, Romania;1. Department of Geography, Royal Holloway University of London, Egham, Surrey TW20 0EX, United Kingdom;2. Department of Geography, Swansea University, Swansea SA2 8PP, United Kingdom;1. Department of Geography, Royal Holloway, University of London, Egham, Surrey TW20 OEX, UK;2. Department of Geography, University of Portsmouth, Buckingham Building, Lion Terrace, Portsmouth PO1 3HE, UK |
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| Abstract: | Glen Roy, Lochaber is a key UK site for understanding Late Devensian environmental change, as it contains an annually-resolved glaciolacustrine varve record. This paper develops our understanding of varve sedimentation within Glen Roy through the examination of a new varve sequence located in a more proximal position on the Allt Bhraic Achaidh Fan, one of a series of major fans within the valley. This new varve record consists of c. 203 annual layers, much fewer years than at other sites in the Lochaber area probably due to five significant hiatuses within the record. Varve sediment characteristics and thickness are comparable to, but not statistically correlated with, other varve series that were used to construct a consolidated varve record for the area, the Lochaber Master Varve Chronology. Sedimentological characteristics, analysed by thin section micromorphology, suggest that varve thickness changes within the basin are controlled mainly by distance from the valley sides rather than the position of the ice margin during the Loch Lomond Readvance, as previously proposed. |
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| Keywords: | Glen Roy Glaciolacustrine Varves Sedimentation patterns |
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