Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland
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 14 C yr B.P., which is older than the previously assumed date of 7300...
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Cambridge University Press (CUP)
1996
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crcambridgeupr:10.1006/qres.1996.0025 2024-09-15T18:09:04+00:00 Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland van Tatenhove, Frank G. M. van der Meer, Jaap J. M. Koster, Eduard A. 1996 http://dx.doi.org/10.1006/qres.1996.0025 http://api.elsevier.com/content/article/PII:S0033589496900253?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589496900253?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400024753 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 45, issue 3, page 245-253 ISSN 0033-5894 1096-0287 journal-article 1996 crcambridgeupr https://doi.org/10.1006/qres.1996.0025 2024-08-14T04:03:11Z 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 14 C yr B.P., which is older than the previously assumed date of 7300 to 6000 14 C yr B.P. The Ørkendalen system is now dated at 6200 to 5600 14 C yr B.P. against earlier estimates of 300 to 700 14 C 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. Article in Journal/Newspaper Greenland ice core Ice Sheet Cambridge University Press Quaternary Research 45 3 245 253 |
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English |
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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 14 C yr B.P., which is older than the previously assumed date of 7300 to 6000 14 C yr B.P. The Ørkendalen system is now dated at 6200 to 5600 14 C yr B.P. against earlier estimates of 300 to 700 14 C 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. |
format |
Article in Journal/Newspaper |
author |
van Tatenhove, Frank G. M. van der Meer, Jaap J. M. Koster, Eduard A. |
spellingShingle |
van Tatenhove, Frank G. M. van der Meer, Jaap J. M. Koster, Eduard A. Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland |
author_facet |
van Tatenhove, Frank G. M. van der Meer, Jaap J. M. Koster, Eduard A. |
author_sort |
van Tatenhove, Frank G. M. |
title |
Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland |
title_short |
Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland |
title_full |
Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland |
title_fullStr |
Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland |
title_full_unstemmed |
Implications for Deglaciation Chronology from New AMS Age Determinations in Central West Greenland |
title_sort |
implications for deglaciation chronology from new ams age determinations in central west greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1006/qres.1996.0025 http://api.elsevier.com/content/article/PII:S0033589496900253?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589496900253?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400024753 |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_source |
Quaternary Research volume 45, issue 3, page 245-253 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1006/qres.1996.0025 |
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Quaternary Research |
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45 |
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3 |
container_start_page |
245 |
op_container_end_page |
253 |
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1810446463989186560 |