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Figure 1: BRITICE-CHRONO transect 3, the Irish Sea East ice lobe, showing a subdivision into major retreat zones, the sampled (summer 2013) geochronology sites and existing dating locations. Inset shows the eight BRITICE-CHRONO transects.
T5 BRITICE-CHRONO Transect 4: constraining the timing and style of British-Irish Ice Sheet retreat of the Irish Sea Ice Stream R.C. Chiverrell 1 *, J. Scourse 2 , K. van Landeghem 2 , L. Yorke 2 , M.J. Burke 1 , G.S.P. Thomas 1 , C. Ó Cofaigh 3 , D.J.A. Evans 3 , D McCarroll 4 , S.M. Davies 4 , G. Duller 5 , D. Small 6 1 School of Environmental Sciences, University of Liverpool, Liverpool 2 School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB 3Department of Geography, Durham University, Durham DH1 3LE 4 Department of Geography, Wallace Building, Swansea University, Singleton Park, Swansea, SA2 8PP 5 Department of Geography & Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB 6 Department of Geographical and Earth Sciences, University of Glasgow, Glasgow, G12 8QQ Transect 4 of the NERC funded consortium BRITICE-CHRONO aims to establish the timing and style of retreat of the British-Irish Ice Sheet (BIIS) from maximum limits in the south Celtic Sea. There are two components to this research. First, a marine geological cruise scheduled to take place on the RRS James Cook in 2014, and second, a programme of on-shore field sampling for terrestrial cosmogenic nuclide (TCN) dating, optically–stimulated luminescence (OSL) dating and radiocarbon dating. This poster focuses on the results, to date, of the terrestrial component. The Irish Sea Ice Stream (ISIS), the largest drainage conduit for the MIS2 British-Irish Ice Sheet (BIIS; Fig. 1), was fed by ice flowing southwards from southern Scotland, northern Ireland and the English Lake District. It divided in two, with the ISIS flowing southwards through the central Irish Sea and into the Celtic Sea. The Welsh Ice Cap contributed ice mass, along with ice draining the Wicklow Mountains and central Ireland. On entering the Celtic Sea the ice extended westwards along the south coast of Ireland west of Cork and southwards as far as the Isles of Scilly. To date the ISIS was probably the best dated sector of BIIS, with an 8000-year retreat history spanning 650 km of ice margin retreat for the largest marine terminating ice stream draining the former British–Irish Ice Sheet. Recent Bayesian modelling of the geochronological data (Chiverrell et al., 2013) shows the ISIS expanded 34.0–25.3 ka, reaching a maximum 25.3–24.5 ka before a retreat uneven in pace affected by variations in the calving margin, ice bed and marginal geometry. Comprehensive mapping of the sediment and landform record from Scilly (Scourse, 2006), eastern Ireland (Thomas and Summers, 1983) and Wales (Thomas and Chiverrell 2007) has allowed division of the transect into discrete zones of ice marginal retreat. Objectives for the research are: (1) to better constrain the evidence base for the LGM on Scilly; (2) to test the role of Irish ice in contributing to the ISIS; and to enhance the existing model for deglaciation south to north across some 400 km. Ten samples for TCN dating were collected from glacially-scoured bedrock and boulders on Scilly, with further samples planned for Wicklow Head. Well defined ice marginal contexts (12 sites) with thick sequences of glacial outwash spaced through the retreat sequence have provided >30 OSL samples from glacifluvial and ice-marginal, shallow subaqueous deposits, principally outwash sandur morain ridges and glacilacustrine deltas exposed in quarries and on the coast. These age estimates will form the basis for revised Bayesian modelling to establish the timing and pattern of retreat of the ISIS. Keywords: BRITICE-CHRONO; British-Irish Ice Sheet; Irish Sea Ice Stream, Cheshire, Shropshire; Lancashire; Cumbria; Isle of Man; deglaciation Chiverrell R C, Thrasher I M, Thomas G S P, Lang A, Scourse J D, van Landeghem K J J, McCarroll D, Clark C D, Cofaigh C O, Evans D J A and Ballantyne C K (2013) Bayesian modelling the retreat of the Irish Sea Ice Stream. Journal of Quaternary Science vol 28 issue 2 pp 200-209 Scourse JD (ed.). 2006. The Isles of Scilly: Field Guide, Quaternary Research Association: London, 13–22.
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QRA@50: Quaternary Revolutions QRA
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Conference Programme Wednesday 8th
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General Notes Exhibitors A small nu
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QRA50: Top 50 UK Quaternary Sites N
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THEME 1: CAUSES OF CLIMATE CHANGE C
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T8 Svalbard surging glacier landsys
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T2 Constraining peatland environmen
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Roberts, S. J. (1997) The spatial e
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T7 Pleistocene sea-surface and inte
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T10 Man, Megafauna and Mycobacteria
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T5 Reconstructing plateau icefields
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T3 Exploiting multi-proxy analysis
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T3 Tipping Points: Rapid Neo-glacia
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T5 Glacial history of the central n
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T8 Reconstructing Quaternary Rhine-
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T9 When was Europe deforested? Larg
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T9 Climate, microtopography and per
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T3 The temperature-δ 18 O relation
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T10 Neolithic land-use change clima
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T5 Assessing existing dating constr
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T10 Assessing the effects of the '2
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Figure 1: Lake ‘Disko 2’ on Dis
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T5 Increased channelization of subg
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T8 Tanera Mor: a new stratotype for
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T9 Assessing seasonality changes du
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T2 Cryptotephra records as archives
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Westaway, R., Bridgland, D.R., Mish
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T3 Songs from the wood: tales of th
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T9 Lateglacial and Holocene Climate
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