Be-10 ages from central east Greenland constrain the extent of the Greenland ice sheet during the Last Glacial Maximum

• Published in: Quaternary Science Reviews
• Main Authors: Håkansson, Lena, Briner, J., Alexanderson, Helena, Aldahan, A., Possnert, G.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2007
• Subjects: Geology; EROSION; HISTORY; CONTINENTAL-MARGIN; SCORESBY SUND; ARCTIC CANADA; BAFFIN-ISLAND; PLEISTOCENE; LANDSCAPES; JAMESON LAND; PRESERVATION; Arctic; Baffin Island; Canada; Greenland; Sund; Scoresby; Kap; Scoresby Sund; Jameson Land; Brewster; Kap Brewster; Baffin; East Greenland; Ice Sheet
• Online Access: https://lup.lub.lu.se/record/1416783; https://doi.org/10.1016/j.quascirev.2007.08.001

Traditional ice sheet reconstructions have suggested two distinctly different ice sheet regimes along the East Greenland continental margin during the Last Glacial Maximum (LGM): ice to the shelf break south of Scoresby Sund and ice extending no further than to the inner shelf at and north of Scoresby Sund. We report new Be-10 ages from erratic boulders perched at 250 m a.s.l. on the Kap Brewster peninsula at the mouth of Scoresby Sund. The average Be-10 ages, calculated with an assumed maximum erosion rate of 1 cm/ka and no erosion (respectively, 17.3 +/- 2.3 ka and 15.1 +/- 1.7 ka) overlap with a period of increased sediment input to the Scoresby Sund fan (19-15 ka). The results presented here suggest that ice reached at least 250 m a.s.l. at the mouth of Scoresby Sund during the LGM and add to a growing body of evidence indicating that LGM ice extended onto the outer shelf in northeast Greenland. (C) 2007 Elsevier Ltd. All rights reserved.