Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland
The extent and timing of ice advances onto the north and southwest Iceland shelf is reconstructed by identifying the depositional environment of four diamicton units present in two marine cores from shelf troughs. We analyze a combination of properties, including sedimentological parameters, microfa...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1781 2023-05-15T16:47:17+02:00 Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland Principato, S. M. Jennings, A. E. Kristjansdottir, G. B. Andrews, J. T. 2005-11 application/pdf http://eprints.esc.cam.ac.uk/1781/ http://eprints.esc.cam.ac.uk/1781/1/PrincipatoJ.SedRes75%282005%29.pdf https://doi.org/10.2110/jsr.2005.073 en eng http://eprints.esc.cam.ac.uk/1781/1/PrincipatoJ.SedRes75%282005%29.pdf Principato, S. M. and Jennings, A. E. and Kristjansdottir, G. B. and Andrews, J. T. (2005) Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland. Journal of Sedimentary Research, 75 (6). pp. 968-983. ISSN 1527-1404 DOI https://doi.org/10.2110/jsr.2005.073 <https://doi.org/10.2110/jsr.2005.073> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2005 ftucambridgeesc https://doi.org/10.2110/jsr.2005.073 2020-08-27T18:09:00Z The extent and timing of ice advances onto the north and southwest Iceland shelf is reconstructed by identifying the depositional environment of four diamicton units present in two marine cores from shelf troughs. We analyze a combination of properties, including sedimentological parameters, microfabric analyses, radiocarbon dates, and foraminiferal assemblage data. This multi-proxy approach for understanding depositional environments of diamicton units is critical in areas where ice sheets extended into the marine environment. The two cores studied contain a lower diamicton unit that is interpreted as subglacial till and an overlying diamicton unit that is interpreted as glacial-marine sediment. Our analysis showed that in general, till is classified by lower water content, lower total organic carbon, and coarser grain size than glacial-marine sediment. Anisotropy of magnetic susceptibility shows that the till has a sheared fabric, low inclination of the short (K3) axis, whereas the glacial-marine sediment has a high inclination of the short (K3) axis and a more random, unsheared fabric. Grain counts on the 106–1000 mm fraction in till contain a higher percentage of basalt, whereas the glacial-marine sediments contain a higher percentage of quartz, volcanic glass, and foraminifera. Foraminiferal assemblage data support the interpretations from the sedimentology and microfabric data. Radiocarbon dates on shells and/or foraminifera in sediments directly above the diamicton units show that the ice retreated from these shelf areas by approximately 13 ka. Article in Journal/Newspaper Iceland University of Cambridge, Department of Earth Sciences: ESC Publications Journal of Sedimentary Research 75 6 968 983 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Principato, S. M. Jennings, A. E. Kristjansdottir, G. B. Andrews, J. T. Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
The extent and timing of ice advances onto the north and southwest Iceland shelf is reconstructed by identifying the depositional environment of four diamicton units present in two marine cores from shelf troughs. We analyze a combination of properties, including sedimentological parameters, microfabric analyses, radiocarbon dates, and foraminiferal assemblage data. This multi-proxy approach for understanding depositional environments of diamicton units is critical in areas where ice sheets extended into the marine environment. The two cores studied contain a lower diamicton unit that is interpreted as subglacial till and an overlying diamicton unit that is interpreted as glacial-marine sediment. Our analysis showed that in general, till is classified by lower water content, lower total organic carbon, and coarser grain size than glacial-marine sediment. Anisotropy of magnetic susceptibility shows that the till has a sheared fabric, low inclination of the short (K3) axis, whereas the glacial-marine sediment has a high inclination of the short (K3) axis and a more random, unsheared fabric. Grain counts on the 106–1000 mm fraction in till contain a higher percentage of basalt, whereas the glacial-marine sediments contain a higher percentage of quartz, volcanic glass, and foraminifera. Foraminiferal assemblage data support the interpretations from the sedimentology and microfabric data. Radiocarbon dates on shells and/or foraminifera in sediments directly above the diamicton units show that the ice retreated from these shelf areas by approximately 13 ka. |
format |
Article in Journal/Newspaper |
author |
Principato, S. M. Jennings, A. E. Kristjansdottir, G. B. Andrews, J. T. |
author_facet |
Principato, S. M. Jennings, A. E. Kristjansdottir, G. B. Andrews, J. T. |
author_sort |
Principato, S. M. |
title |
Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland |
title_short |
Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland |
title_full |
Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland |
title_fullStr |
Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland |
title_full_unstemmed |
Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland |
title_sort |
glacial-marine or subglacial origin of diamicton units from the southwest and north iceland shelf: implications for the glacial history of iceland |
publishDate |
2005 |
url |
http://eprints.esc.cam.ac.uk/1781/ http://eprints.esc.cam.ac.uk/1781/1/PrincipatoJ.SedRes75%282005%29.pdf https://doi.org/10.2110/jsr.2005.073 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
http://eprints.esc.cam.ac.uk/1781/1/PrincipatoJ.SedRes75%282005%29.pdf Principato, S. M. and Jennings, A. E. and Kristjansdottir, G. B. and Andrews, J. T. (2005) Glacial-marine or subglacial origin of diamicton units from the southwest and North Iceland shelf: Implications for the glacial history of Iceland. Journal of Sedimentary Research, 75 (6). pp. 968-983. ISSN 1527-1404 DOI https://doi.org/10.2110/jsr.2005.073 <https://doi.org/10.2110/jsr.2005.073> |
op_doi |
https://doi.org/10.2110/jsr.2005.073 |
container_title |
Journal of Sedimentary Research |
container_volume |
75 |
container_issue |
6 |
container_start_page |
968 |
op_container_end_page |
983 |
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1766037373167075328 |