Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources
We examine variations in the ice-rafted sources for sediments in the Iceland/East Greenland offshore marine archives by utilizing a sediment unmixing model and link the results to a coupled iceberg-ocean model. Surface samples from around Iceland and along the E/NE Greenland shelf are used to define...
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ftleedsuniv:oai:eprints.whiterose.ac.uk:78108 2024-06-02T08:05:44+00:00 Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources Andrews, J.T Bigg, G.R Wilton, D.J 2014-05-01 text https://eprints.whiterose.ac.uk/78108/ https://eprints.whiterose.ac.uk/78108/1/WRRO_78108.pdf https://doi.org/10.1016/j.quascirev.2013.08.019 en eng Elsevier https://eprints.whiterose.ac.uk/78108/1/WRRO_78108.pdf Andrews, J.T, Bigg, G.R and Wilton, D.J (2014) Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources. Quaternary Science Reviews, 91. pp. 204-217. ISSN 0277-3791 Article PeerReviewed 2014 ftleedsuniv https://doi.org/10.1016/j.quascirev.2013.08.019 2024-05-06T12:42:13Z We examine variations in the ice-rafted sources for sediments in the Iceland/East Greenland offshore marine archives by utilizing a sediment unmixing model and link the results to a coupled iceberg-ocean model. Surface samples from around Iceland and along the E/NE Greenland shelf are used to define potential sediment sources, and these are examined within the context of the down-core variations in mineralogy in the <2 mm sediment fraction from a transect of cores across Denmark Strait. A sediment unmixing model is used to estimate the fraction of sediment <2 mm off NW and N Iceland exported across Denmark Strait; this averaged between 10 and 20%. Both the sediment unmixing model and the coupled iceberg-ocean model are consistent in finding that the fraction of "far-travelled" sediments in the Denmark Strait environs is overwhelmingly of local, mid-East Greenland, provenance, and therefore with a significant cross-channel component to their travel. The Holocene record of ice-rafted sediments denotes a three-part division of the Holocene in terms of iceberg sediment transport with a notable increase in the process starting ca 4000 cal yr BP. This latter increase may represent the re-advance during the Neoglacial period of land-terminating glaciers on the Geikie Plateau to become marine-terminating. The contrast in spectral signals between these cores and the 1500-yr cycle at VM28-14, just south of the Denmark Strait, combined with the coupled iceberg-model results, leads us to speculate that the signal at VM28-14 reflects pulses in overflow waters, rather than an ice-rafted signal. © 2013 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Denmark Strait East Greenland Greenland Iceland White Rose Research Online (Universities of Leeds, Sheffield & York) Geikie Plateau ENVELOPE(-25.167,-25.167,69.917,69.917) Greenland Quaternary Science Reviews 91 204 217 |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
description |
We examine variations in the ice-rafted sources for sediments in the Iceland/East Greenland offshore marine archives by utilizing a sediment unmixing model and link the results to a coupled iceberg-ocean model. Surface samples from around Iceland and along the E/NE Greenland shelf are used to define potential sediment sources, and these are examined within the context of the down-core variations in mineralogy in the <2 mm sediment fraction from a transect of cores across Denmark Strait. A sediment unmixing model is used to estimate the fraction of sediment <2 mm off NW and N Iceland exported across Denmark Strait; this averaged between 10 and 20%. Both the sediment unmixing model and the coupled iceberg-ocean model are consistent in finding that the fraction of "far-travelled" sediments in the Denmark Strait environs is overwhelmingly of local, mid-East Greenland, provenance, and therefore with a significant cross-channel component to their travel. The Holocene record of ice-rafted sediments denotes a three-part division of the Holocene in terms of iceberg sediment transport with a notable increase in the process starting ca 4000 cal yr BP. This latter increase may represent the re-advance during the Neoglacial period of land-terminating glaciers on the Geikie Plateau to become marine-terminating. The contrast in spectral signals between these cores and the 1500-yr cycle at VM28-14, just south of the Denmark Strait, combined with the coupled iceberg-model results, leads us to speculate that the signal at VM28-14 reflects pulses in overflow waters, rather than an ice-rafted signal. © 2013 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Andrews, J.T Bigg, G.R Wilton, D.J |
spellingShingle |
Andrews, J.T Bigg, G.R Wilton, D.J Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources |
author_facet |
Andrews, J.T Bigg, G.R Wilton, D.J |
author_sort |
Andrews, J.T |
title |
Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources |
title_short |
Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources |
title_full |
Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources |
title_fullStr |
Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources |
title_full_unstemmed |
Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources |
title_sort |
holocene ice-rafting and sediment transport from the glaciated margin of east greenland (67-70°n) to the n iceland shelves: detecting and modelling changing sediment sources |
publisher |
Elsevier |
publishDate |
2014 |
url |
https://eprints.whiterose.ac.uk/78108/ https://eprints.whiterose.ac.uk/78108/1/WRRO_78108.pdf https://doi.org/10.1016/j.quascirev.2013.08.019 |
long_lat |
ENVELOPE(-25.167,-25.167,69.917,69.917) |
geographic |
Geikie Plateau Greenland |
geographic_facet |
Geikie Plateau Greenland |
genre |
Denmark Strait East Greenland Greenland Iceland |
genre_facet |
Denmark Strait East Greenland Greenland Iceland |
op_relation |
https://eprints.whiterose.ac.uk/78108/1/WRRO_78108.pdf Andrews, J.T, Bigg, G.R and Wilton, D.J (2014) Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70°N) to the N Iceland shelves: detecting and modelling changing sediment sources. Quaternary Science Reviews, 91. pp. 204-217. ISSN 0277-3791 |
op_doi |
https://doi.org/10.1016/j.quascirev.2013.08.019 |
container_title |
Quaternary Science Reviews |
container_volume |
91 |
container_start_page |
204 |
op_container_end_page |
217 |
_version_ |
1800750609256677376 |