Portal de Periódicos da CAPES

Cosmogenic 10Be chronology of the last deglaciation of western Ireland, and implications for sensitivity of the Irish Ice Sheet to climate Change

2006; Geological Society of America; Volume: preprint; Issue: 2008 Linguagem: Inglês

10.1130/b26288.1

1943-2674

Jorie Clark, Anne McCabe, Christoph Schnabel, Peter U. Clark, Stephen McCarron, Stewart P.H.T. Freeman, C. Maden, Sheng Xu,

Archaeology and ancient environmental studies

Research Article| January 01, 2009 Cosmogenic 10Be chronology of the last deglaciation of western Ireland, and implications for sensitivity of the Irish Ice Sheet to climate change Jorie Clark; Jorie Clark * 1School of Environmental Science, University of Ulster, Coleraine, County Londonderry BT52 1SA, UK †E-mail: jorieclark@hotmail.com. Search for other works by this author on: GSW Google Scholar A. Marshall McCabe; A. Marshall McCabe 1School of Environmental Science, University of Ulster, Coleraine, County Londonderry BT52 1SA, UK Search for other works by this author on: GSW Google Scholar Christoph Schnabel; Christoph Schnabel 2Natural Environment Research Council Cosmogenic Isotope Analysis Facility, Scottish Enterprise Technology Park, East Kilbride G75 0QF, UK Search for other works by this author on: GSW Google Scholar Peter U. Clark; Peter U. Clark 3Department of Geosciences, Oregon State University, Corvallis, Oregon 97331, USA Search for other works by this author on: GSW Google Scholar Stephen McCarron; Stephen McCarron 4Department of Geography, National University of Ireland, Maynooth, County Kildare, Ireland Search for other works by this author on: GSW Google Scholar Stewart P.H.T. Freeman; Stewart P.H.T. Freeman 5Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, UK Search for other works by this author on: GSW Google Scholar C. Maden; C. Maden 5Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, UK Search for other works by this author on: GSW Google Scholar S. Xu S. Xu 5Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, UK Search for other works by this author on: GSW Google Scholar GSA Bulletin (2009) 121 (1-2): 3–16. https://doi.org/10.1130/B26288.1 Article history received: 06 Jul 2007 rev-recd: 27 Feb 2008 accepted: 28 Feb 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Jorie Clark, A. Marshall McCabe, Christoph Schnabel, Peter U. Clark, Stephen McCarron, Stewart P.H.T. Freeman, C. Maden, S. Xu; Cosmogenic 10Be chronology of the last deglaciation of western Ireland, and implications for sensitivity of the Irish Ice Sheet to climate change. GSA Bulletin 2009;; 121 (1-2): 3–16. doi: https://doi.org/10.1130/B26288.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Accelerator mass spectrometry (AMS) 14C dates of fossiliferous marine mud identify a readvance of the Irish Ice Sheet from the north and central lowlands of Ireland into the northern Irish Sea Basin during the Killard Point Stadial at ca. 16.5 cal k.y. B.P., with subsequent deglaciation occurring by ca. 15.0–15.5 cal k.y. B.P. Killard Point Stadial moraines have been mapped elsewhere in Ireland but have previously remained undated. Here, we report sixteen 10Be surface exposure dates that constrain the age of retreat of the Killard Point Stadial ice margin from western Ireland. Eight 10Be dates from the Ox Mountains (13.9–18.1 ka) indicate that final deposition of the moraine occurred at 15.6 ± 0.5 ka (mean age, standard error). Eight 10Be dates from Furnace Lough (14.1–17.3 ka, mean age of 15.6 ± 0.4 ka) are statistically indistinguishable from the Ox Mountain samples, suggesting that the moraines were deposited during the same glacial event. Given the agreement between the two age groups, and their common association with a regionally significant moraine system, we combine them to derive a mean age of 15.6 ± 0.3 ka (15.6 ± 1.0 ka with external uncertainty). This age is in excellent agreement with the timing of deglaciation from the Irish Sea Basin (at or older than 15.3 ± 0.2 cal k.y. B.P.) and suggests the onset of near-contemporaneous retreat of the Irish Ice Sheet from its maximum Killard Point Stadial limit. A reconstruction of the ice surface indicates that the Irish Ice Sheet reached a maximum surface elevation of ~500 m over the central Irish Lowlands during the Killard Point Stadial, suggesting a high sensitivity of the ice sheet to small changes in climate. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.