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...
| Autores: | , , , , , , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/216006 |
| Acceso en línea: | https://hdl.handle.net/2445/216006 |
| Access Level: | acceso abierto |
| Palabra clave: | Geomorfologia Geomorfologia glacial Períodes glacials Grenlàndia Geomorphology Glacial landforms Glacial epoch Greenland |
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ES_73880d2ba4eae4d72e2ba62a205568ec |
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oai:diposit.ub.edu:2445/216006 |
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España |
| spelling |
Late Glacial deglaciation of the Zackenberg area NE Greenland García Oteyza, J. Oliva Franganillo, Marc Palacios Estremera, David Fernández Fernández, J.-M. Schimmelpfennig, I. Andres, N. Antoniades, Dermot Christiansen, Hanne H. Humlum, O. Leanni, L. Jomelli, V. Ruiz Fernández, Jesús Rinterknecht, V. Lane, T. P. Adamson, K. Aumaitre, Georges Bourles, Didier Keddadouche, Karim Geomorfologia Geomorfologia glacial Períodes glacials Grenlàndia Geomorphology Glacial landforms Glacial epoch 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 deglaciation of the Zackenberg Valley (74°N, 20°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. Elsevier B.V. https://hdl.handle.net/2445/216006 |
| title |
Late Glacial deglaciation of the Zackenberg area NE Greenland |
| spellingShingle |
Late Glacial deglaciation of the Zackenberg area NE Greenland García Oteyza, J. Geomorfologia Geomorfologia glacial Períodes glacials Grenlàndia Geomorphology Glacial landforms Glacial epoch 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 |
| author |
García Oteyza, J. |
| author_facet |
García Oteyza, J. Oliva Franganillo, Marc Palacios Estremera, David Fernández Fernández, J.-M. Schimmelpfennig, I. Andres, N. Antoniades, Dermot Christiansen, Hanne H. Humlum, O. Leanni, L. Jomelli, V. Ruiz Fernández, Jesús Rinterknecht, V. Lane, T. P. Adamson, K. Aumaitre, Georges Bourles, Didier Keddadouche, Karim |
| author_role |
author |
| author2 |
Oliva Franganillo, Marc Palacios Estremera, David Fernández Fernández, J.-M. Schimmelpfennig, I. Andres, N. Antoniades, Dermot Christiansen, Hanne H. Humlum, O. Leanni, L. Jomelli, V. Ruiz Fernández, Jesús Rinterknecht, V. Lane, T. P. Adamson, K. Aumaitre, Georges Bourles, Didier Keddadouche, Karim |
| author2_role |
author author author author author author author author author author author author author author author author author |
| topic |
Geomorfologia Geomorfologia glacial Períodes glacials Grenlàndia Geomorphology Glacial landforms Glacial epoch Greenland |
| topic_facet |
Geomorfologia Geomorfologia glacial Períodes glacials Grenlàndia Geomorphology Glacial landforms Glacial epoch Greenland |
| 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°N, 20°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. |
| publishDate |
2022 |
| format |
article |
| status_str |
publishedVersion |
| url |
https://hdl.handle.net/2445/216006 |
| eu_rights_str_mv |
openAccess |
| publisher |
Elsevier B.V. |
| institution |
Universidad de Barcelona |
| collection |
Dipòsit Digital de la UB |
| reponame_str |
Dipòsit Digital de la UB |
| instname_str |
Universidad de Barcelona |
| _version_ |
1878436390805438464 |
| publishDateSort |
2022 |
| author_browse |
Adamson, K. Andres, N. Antoniades, Dermot Aumaitre, Georges Bourles, Didier Christiansen, Hanne H. Fernández Fernández, J.-M. García Oteyza, J. Humlum, O. Jomelli, V. Keddadouche, Karim Lane, T. P. Leanni, L. Oliva Franganillo, Marc Palacios Estremera, David Rinterknecht, V. Ruiz Fernández, Jesús Schimmelpfennig, I. |
| publisherStr |
Elsevier B.V. |
| score |
6,9303427 |