10Be ages from central east Greenland constrain the extent of the Greenland ice sheet during the Last Glacial Maximum |
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| Affiliation: | 1. Department of Geology, Quaternary Sciences, GeoBiosphere Centre, Sölvegatan 12, 223 62 Lund, Sweden;2. Department of Geology, University at Buffalo, 876 NSC, Buffalo, NY 14260, USA;3. Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden;4. Department of Earth Sciences, Villavägen 16, SE-752 36 Uppsala, Sweden;5. Tandem Laboratory, Uppsala University, SE-751 21 Uppsala, Sweden;1. Department of Marine Geology and Glaciology, Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark;2. Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology, Sem Særlands Veg 1, N-7491 Trondheim, Norway;3. Department of Geology, University at Buffalo, Buffalo, NY 14260, USA;4. Department of Geological Sciences, Brown University, Providence, RI 02912, USA;1. Department of Geoscience, University of Wisconsin, Madison, WI 53706, USA;2. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA;1. Department of Geology, University at Buffalo, Buffalo, NY, USA;2. School of Earth Sciences & Environmental Sustainability, Northern Arizona University, Flagstaff, AZ, USA;3. Dept of Earth and Planetary Sciences, Northwestern University, Evanston, IL, 60208, USA;4. Geological Survey of Denmark and Greenland, Copenhagen, Denmark;5. Department of Geosciences, University of Massachusetts, Amherst, MA, 01003, USA;6. Centre de recherche en géochimie et géodynamique (Geotop), Université du Québec à Montréal, Montréal, QC, Canada;7. Department of Geology, University of Ottawa, Ottawa, ON, K1N6N5, Canada;8. Centre Eau Terre Environnement, Institut national de la recherche scientifique, Québec, Qc G1K 9A9, Canada;9. GEOTOP Research Center, Montréal, Qc H3C 3P8, Canada;10. Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, ON, K1N6N5, Canada;11. Institute of Arctic and Alpine Research, University of Colorado, Boulder, USA;12. Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado, Boulder, USA;13. Institute of Geology and Mineralogy, University of Cologne, Köln, Germany;1. Department of Geology, Humboldt State University, 1 Harpst St Arcata, CA, 95521, USA;2. Department of Geoscience, Aarhus University, Aarhus, Denmark;3. Globe Institute, University of Copenhagen, Denmark;4. Geological Survey of Denmark and Greenland (GEUS), Copenhagen, Denmark;5. Department of Earth Sciences, Dartmouth College, Hanover, NH, USA;6. Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark;7. Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory Livermore, USA;8. Department of Geoscience and Natural Resource Management, University of Copenhagen, Denmark;1. Department of Geoscience, University of Wisconsin-Madison, 1215 W. Dayton St., Madison, WI, 53706, USA;2. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 101 SW 26th St., Corvallis, OR, 97331, USA;3. Department of Physics and Astronomy, Purdue University, 525 Northwestern Ave, West Lafayette, IN, 47907, USA;4. Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Lafayette St., West Lafayette, IN, 47907, USA |
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| Abstract: | ![]()
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 10Be ages from erratic boulders perched at 250 m a.s.l. on the Kap Brewster peninsula at the mouth of Scoresby Sund. The average 10Be 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. |
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