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Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland

Published online by Cambridge University Press:  20 January 2017

Frank G. M. van Tatenhove ,
Jaap J. M. van der Meer  and
Eduard A. Koster
Frank G. M. van Tatenhove
Affiliation:
Department of Physical Geography and Soil Science, University of Amsterdam, The Netherlands Centre of Geo-Ecological Research (ICG), Nieuwe Prinsengracht 130, 1018 VZ, Amsterdam, The Netherlands
Jaap J. M. van der Meer
Affiliation:
Department of Physical Geography and Soil Science, University of Amsterdam, The Netherlands Centre of Geo-Ecological Research (ICG), Nieuwe Prinsengracht 130, 1018 VZ, Amsterdam, The Netherlands
Eduard A. Koster
Affiliation:
Department of Physical Geography, Utrecht University, ICG, P.O. Box 80115, 3508 TC, Utrecht, The Netherlands
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Abstract

New evidence has been obtained for the age of the Umı̂vı̂t/Keglen and Ørkendalen moraine systems close to the present ice sheet margin in central West Greenland. The Umı̂vı̂t/Keglen moraine system is dated at 7500 to 6500 14C yr B.P., which is older than the previously assumed date of 7300 to 6000 14C yr B.P. The Ørkendalen system is now dated at 6200 to 5600 14C yr B.P. against earlier estimates of 300 to 700 14C yr B.P. The new age is based on AMS radiocarbon-dated organic material within depressions between morainic ridges belonging to the Ørkendalen system. A major implication of the new age is that ice margin positions prevailed for about 6000 years behind the present ice sheet margin. The retreat behind the present margin could be substantial, and in the light of deglaciation rates prior to the Ørkendalen phase, may be ca. 10's of kilometers rather than kilometers. Circumstantial evidence is found for the retreat of the ice sheet margin behind its present position during the Holocene climatic optimum. The results, placed into a time frame of deglaciation since the last glacial maximum, enable comparison with Greenland ice sheet models and ice core records.

Type
Research Article
Information
Quaternary Research , Volume 45 , Issue 3 , May 1996 , pp. 245 - 253
Copyright
University of Washington

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