Helena Alexandersson

Helena Alexanderson

Professor

Helena Alexandersson

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

Författare

  • Lena Håkansson
  • J. Briner
  • Helena Alexanderson
  • A. Aldahan
  • G. Possnert

Summary, in English

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.

Ämne

  • Geology

Nyckelord

  • EROSION
  • HISTORY
  • CONTINENTAL-MARGIN
  • SCORESBY SUND
  • ARCTIC CANADA
  • BAFFIN-ISLAND
  • PLEISTOCENE
  • LANDSCAPES
  • JAMESON LAND
  • PRESERVATION

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0277-3791