Data/hora: 03/06/2024 02:09:00

Provedor de dados: 	5	
País: 	France	
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	
Autores: 	Andrews, John T.; Bigg, Grant R.; Wilton, David J.	
Data: 	2014-05-01	
Ano: 	2014	
Palavras-chave: 	Holocene; Ice-rafting; Ice bergs; East Greenland; Iceland.	
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 &lt;2 mm sediment fraction from a transect of cores across Denmark Strait. A sediment unmixing model is used to estimate the fraction of sediment &lt;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.	
Tipo: 	Text	
Idioma: 	Inglês	
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/	
Editor: 	Pergamon-elsevier Science Ltd	
Formato: 	application/pdf	
Fonte: 	Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2014-05-01 , Vol. 91 , P. 204-217	
Fonte: 	2013 The Authors. Published by Elsevier Ltd

info:eu-repo/semantics/openAccess

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