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AAB-01 Arctic and Antarctic records of deglaciation since the Last Glacial Maximum: Processes, timing and causes
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Converging in-situ cosmogenic radionuclide and radiocarbon constraints on last glacial maximum ice sheet fluctuations, northern Andøya, North Norway
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K. I. Torbjørn Dahlgren, Statoil ASA (Norway)
Derek Fabel, University of Glasgow (United Kingdom)
Arjen P. Stroeven, Stockholm University (Sweden)
Karl-Dag Vorren, University of Tromsø (Norway)
Tore O. Vorren, University of Tromsø (Norway)
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We compare two 10Be apparent exposure ages of boulders on terminal moraines bordering previously-studied lakes on northern Andøya, North Norway, with radiocarbon dates from basal sediments in these lakes. The Kjølhaug moraine has an apparent exposure age of 22.1±2.2 ka and the Eindleten moraine has an age of 20.0±2.1 ka. Taking the relative age sequence of the formation of the lakes and moraines into account, the calibrated radiocarbon ages and 10Be ages overlap within uncertainty. The cosmogenic radionuclide and radiocarbon evidence thus mutually support each other. Based on this evidence we infer (i) the absence of a significant reservoir effect on radiocarbon ages, despite the fact that some lakes show a marine influence, and (ii) no significant surface erosion of the sampled quartz surfaces, despite visible surface removal of feldspar-rich matrix.
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