Late Glacial deglaciation of the Zackenberg area, NE Greenland
The Greenland Ice Sheet (GrIS) is a key component of the global climate system. However, our current understanding of the spatio-temporal oscillations and landscape transformation of the GrIS margins since the last glacial cycle is still incomplete. The objective of this work is to study the deglaci...
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ftird:oai:ird.fr:fdi:010084709 2024-09-15T18:07:38+00:00 Late Glacial deglaciation of the Zackenberg area, NE Greenland Garcia-Oteyza, J. Oliva, M. Palacios, D. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Andres, N. Antoniades, D. Christiansen, H. H. Humlum, O. /Leanni, Laetitia Jomelli, V. Ruiz-Fernandez, J. Rinterknecht, V. Lane, T. P. Adamson, K. Aumaitre, G. Bourles, D. Keddadouche, K. ASTER Team GROENLAND 2022 https://www.documentation.ird.fr/hor/fdi:010084709 EN eng https://www.documentation.ird.fr/hor/fdi:010084709 oai:ird.fr:fdi:010084709 Garcia-Oteyza J., Oliva M., Palacios D., Fernandez-Fernandez J. M., Schimmelpfennig I., Andres N., Antoniades D., Christiansen H. H., Humlum O., Leanni Laetitia, Jomelli V., Ruiz-Fernandez J., Rinterknecht V., Lane T. P., Adamson K., Aumaitre G., Bourles D., Keddadouche K., ASTER Team. Late Glacial deglaciation of the Zackenberg area, NE Greenland. 2022, 401, 108125 [21 p.] NE Greenland Zackenberg Deglaciation Geomorphology Paraglacial dynamics Cosmic-ray exposure text 2022 ftird 2024-08-15T05:57:40Z The Greenland Ice Sheet (GrIS) is a key component of the global climate system. However, our current understanding of the spatio-temporal oscillations and landscape transformation of the GrIS margins since the last glacial cycle is still incomplete. The objective of this work is to study the deglaciation of the Zackenberg Valley (74 degrees N, 20 degrees E), NE Greenland, and the origin of the derived landforms. Based on extensive fieldwork and high-detail geomorphological mapping we identified the different types of landforms, from which those of glacial and paraglacial origin were used to understand the processes driving regional environmental evolution. We applied cosmic-ray exposure (CRE) dating to 32 samples taken from erosive and depositional glacial landforms distributed across the valley. Geomorphological evidence shows that >800-m-thick Late Quaternary glacier filled the valleys and fjords and covered mountain summits. In subsequent phases, as ice thickness decreased, the glacier was limited to the interior of the valley, leaving several lateral moraines. The deglaciation of the Zackenberg Valley that started by-13.7-12.5 ka also accelerated slope paraglacial processes. Many blocks from lateral moraines were remobilized and fell, reaching the valley floor where they covered the thinning glacier tongue; transforming it into a debris-covered glacier that subsequently melted gradually. By ca. 10.5 ka, the last remnants of glacial ice disappeared from the Zackenberg Valley floor, a chronology of deglaciation that is similar to that observed in other sites across NE Greenland. The results of this work must be considered in similar studies, reinforcing the need to support CRE ages of the different geomorphological phases with paleoclimatic data from other sedimentary records. Text glacier Greenland Groenland Ice Sheet Zackenberg IRD (Institute de recherche pour le développement): Horizon |
institution |
Open Polar |
collection |
IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
topic |
NE Greenland Zackenberg Deglaciation Geomorphology Paraglacial dynamics Cosmic-ray exposure |
spellingShingle |
NE Greenland Zackenberg Deglaciation Geomorphology Paraglacial dynamics Cosmic-ray exposure Garcia-Oteyza, J. Oliva, M. Palacios, D. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Andres, N. Antoniades, D. Christiansen, H. H. Humlum, O. /Leanni, Laetitia Jomelli, V. Ruiz-Fernandez, J. Rinterknecht, V. Lane, T. P. Adamson, K. Aumaitre, G. Bourles, D. Keddadouche, K. ASTER Team Late Glacial deglaciation of the Zackenberg area, NE Greenland |
topic_facet |
NE Greenland Zackenberg Deglaciation Geomorphology Paraglacial dynamics Cosmic-ray exposure |
description |
The Greenland Ice Sheet (GrIS) is a key component of the global climate system. However, our current understanding of the spatio-temporal oscillations and landscape transformation of the GrIS margins since the last glacial cycle is still incomplete. The objective of this work is to study the deglaciation of the Zackenberg Valley (74 degrees N, 20 degrees E), NE Greenland, and the origin of the derived landforms. Based on extensive fieldwork and high-detail geomorphological mapping we identified the different types of landforms, from which those of glacial and paraglacial origin were used to understand the processes driving regional environmental evolution. We applied cosmic-ray exposure (CRE) dating to 32 samples taken from erosive and depositional glacial landforms distributed across the valley. Geomorphological evidence shows that >800-m-thick Late Quaternary glacier filled the valleys and fjords and covered mountain summits. In subsequent phases, as ice thickness decreased, the glacier was limited to the interior of the valley, leaving several lateral moraines. The deglaciation of the Zackenberg Valley that started by-13.7-12.5 ka also accelerated slope paraglacial processes. Many blocks from lateral moraines were remobilized and fell, reaching the valley floor where they covered the thinning glacier tongue; transforming it into a debris-covered glacier that subsequently melted gradually. By ca. 10.5 ka, the last remnants of glacial ice disappeared from the Zackenberg Valley floor, a chronology of deglaciation that is similar to that observed in other sites across NE Greenland. The results of this work must be considered in similar studies, reinforcing the need to support CRE ages of the different geomorphological phases with paleoclimatic data from other sedimentary records. |
format |
Text |
author |
Garcia-Oteyza, J. Oliva, M. Palacios, D. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Andres, N. Antoniades, D. Christiansen, H. H. Humlum, O. /Leanni, Laetitia Jomelli, V. Ruiz-Fernandez, J. Rinterknecht, V. Lane, T. P. Adamson, K. Aumaitre, G. Bourles, D. Keddadouche, K. ASTER Team |
author_facet |
Garcia-Oteyza, J. Oliva, M. Palacios, D. Fernandez-Fernandez, J. M. Schimmelpfennig, I. Andres, N. Antoniades, D. Christiansen, H. H. Humlum, O. /Leanni, Laetitia Jomelli, V. Ruiz-Fernandez, J. Rinterknecht, V. Lane, T. P. Adamson, K. Aumaitre, G. Bourles, D. Keddadouche, K. ASTER Team |
author_sort |
Garcia-Oteyza, J. |
title |
Late Glacial deglaciation of the Zackenberg area, NE Greenland |
title_short |
Late Glacial deglaciation of the Zackenberg area, NE Greenland |
title_full |
Late Glacial deglaciation of the Zackenberg area, NE Greenland |
title_fullStr |
Late Glacial deglaciation of the Zackenberg area, NE Greenland |
title_full_unstemmed |
Late Glacial deglaciation of the Zackenberg area, NE Greenland |
title_sort |
late glacial deglaciation of the zackenberg area, ne greenland |
publishDate |
2022 |
url |
https://www.documentation.ird.fr/hor/fdi:010084709 |
op_coverage |
GROENLAND |
genre |
glacier Greenland Groenland Ice Sheet Zackenberg |
genre_facet |
glacier Greenland Groenland Ice Sheet Zackenberg |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010084709 oai:ird.fr:fdi:010084709 Garcia-Oteyza J., Oliva M., Palacios D., Fernandez-Fernandez J. M., Schimmelpfennig I., Andres N., Antoniades D., Christiansen H. H., Humlum O., Leanni Laetitia, Jomelli V., Ruiz-Fernandez J., Rinterknecht V., Lane T. P., Adamson K., Aumaitre G., Bourles D., Keddadouche K., ASTER Team. Late Glacial deglaciation of the Zackenberg area, NE Greenland. 2022, 401, 108125 [21 p.] |
_version_ |
1810445018823917568 |