| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67-70 degrees N) to the N Iceland shelves: detecting and modelling changing sediment sources
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| Autores: |
Andrews, John T.
Bigg, Grant R.
Wilton, David J.
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| Data: |
2014-05-01
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| Ano: |
2014
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| Palavras-chave: |
Holocene
Ice-rafting
Ice bergs
East Greenland
Iceland
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| Resumo: |
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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00290/40150/39091.pdf
https://archimer.ifremer.fr/doc/00290/40150/39092.xlsx
DOI:10.1016/j.quascirev.2013.08.019
https://archimer.ifremer.fr/doc/00290/40150/
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| Editor: |
Pergamon-elsevier Science Ltd
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| Formato: |
application/pdf
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| Fonte: |
Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2014-05-01 , Vol. 91 , P. 204-217
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| Direitos: |
2013 The Authors. Published by Elsevier Ltd
info:eu-repo/semantics/openAccess
restricted use
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