HR: 1340h
AN: U33A-0008    [Abstracts]
TI: ¹⁰Be chronology for the deglaciation of the western margin of the British-Irish Ice Sheet, Ireland
AU: * Clark, J
EM: jorieclark@hotmail.com
AF: Environmental Sciences, University of Ulster, Coleraine, BT52 1SA United Kingdom
AU: McCabe, M
EM: m.mccabe@ulst.ac.uk
AF: Environmental Sciences, University of Ulster, Coleraine, BT52 1SA United Kingdom
AU: Schnabel, C
EM: c.schnabel@suerc.gla.ac.uk
AF: Scottish Universities Environmental Research Centre, Scottish Enterprise Tech Park, East Kilbride, G75 0QF United Kingdom
AU: Freeman, S
EM: s.freeman@suerc.gla.ac.uk
AF: Scottish Universities Environmental Research Centre, Scottish Enterprise Tech Park, East Kilbride, G75 0QF United Kingdom
AU: Maden, C
EM: c.maden@suerc.gla.ac.uk
AF: Scottish Universities Environmental Research Centre, Scottish Enterprise Tech Park, East Kilbride, G75 0QF United Kingdom
AU: Xu, S
EM: s.xu@suerc.gla.ac.uk
AF: Scottish Universities Environmental Research Centre, Scottish Enterprise Tech Park, East Kilbride, G75 0QF United Kingdom
AB: AMS ¹⁴C dates of fossiliferous marine mud from sites along the Irish Sea Basin identify a major readvance of the ice sheet over the north and central lowlands of Ireland and the northern Irish Sea Basin during the Killard Point Stadial at approximately 14 ¹⁴C ka BP (~17.5 cal ka). Well-dated records at Corvish, County Donegal, suggest a similar-age readvance of the northwestern sector of the Irish ice sheet, indicating ice-sheet wide response to climate forcing associated with Heinrich event 1. Ice readvance caused widespread transport of subglacial sediment to ice margins, particularly around bays where large moraines were formed. We sampled boulders for ¹⁰Be dating from moraines in the north and west of Ireland that may be coeval with the Killard Point Stadial. Samples were collected from quartz-bearing erratics from three distinct moraine sequences located in the northwest (Bloody Foreland, County Donegal) and west (Ox Mountains, County Sligo, and Clew Bay, County Mayo) of Ireland. Thus far, we have obtained the following ¹⁰Be ages from these moraine sequences: Bloody Foreland (15,500 ± 1400 yr, 18,900 ± 1400 yr, and 18,400 ± 1480 yr), Ox Mountains (13,590 ± 1200 yr, 14,210 ± 1150 yr, 14,450 ± 1370 yr, and 17,890 ± 1300 yr), and Furnace Lough (15,570 ± 2500 yr, 15,600 ± 1200 yr, and 13,500 ± 1000 yr). These data suggest an older deglaciation at Bloody Foreland at ~18.5 ¹⁰Be ka following the last glacial maximum, and a younger deglaciation in the Ox Mountains and Furnace Lough areas at ~14.5 ¹⁰Be ka following the Killard Point ice readvance.
DE: 1824 Geomorphology: general (1625)
DE: 1827 Glaciology (0736, 0776, 1863)
DE: 1863 Snow and ice (0736, 0738, 0776, 1827)
SC: Union [U]
MN: Fall Meeting 2005