Compositional variability of ice-rafted debris in Heinrich layers 1 and 2 on the northwest European continental slope identified by environmental magnetic analyses

The composition of ice-rafted debris (IRD) within a sediment core from the European continental slope (core OMEX-2K; 49 degrees 5' N, 13 degrees 26' W) has been examined using environmental magnetic analyses. The data demonstrate compositional variability of the IRD within Heinrich layers...

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Bibliographic Details
Published in:Journal of Quaternary Science
Main Authors: Walden, John, Wadsworth, Emilie, Austin, William E. N., Peters, Clare, Scourse, James D., Hall, Ian R.
Format: Article in Journal/Newspaper
Language:English
Published: 2007
Subjects:
DEEP-SEA SEDIMENTS
ATLANTIC-OCEAN
LABRADOR SEA
SHEET VARIABILITY
NE ATLANTIC
GRAIN-SIZE
EVENTS
CLIMATE
OSCILLATIONS
TRANSITION
Fennoscandian
Ice Sheet
Labrador Sea
North Atlantic
Northeast Atlantic
Online Access:https://risweb.st-andrews.ac.uk/portal/en/researchoutput/compositional-variability-of-icerafted-debris-in-heinrich-layers-1-and-2-on-the-northwest-european-continental-slope-identified-by-environmental-magnetic-analyses(ae80244e-a962-4928-ae03-7dbf69215b39).html
https://doi.org/10.1002/jqs.1020
http://www.scopus.com/inward/record.url?scp=33847164847&partnerID=8YFLogxK
Description
Summary:The composition of ice-rafted debris (IRD) within a sediment core from the European continental slope (core OMEX-2K; 49 degrees 5' N, 13 degrees 26' W) has been examined using environmental magnetic analyses. The data demonstrate compositional variability of the IRD within Heinrich layers 2 (H2) and 1 (H1) and these differences are most readily explained by changes in the contribution of different IRD sources to the core site. Some IRD within the main Heinrich layers show magnetic signatures that are similar to IRD derived from the Laurentide ice sheet found in cores from within the main North Atlantic IRD-belt. In contrast, other IRD-rich layers, both prior to and within the journal of Quaternary Science main Heinrich layers, demonstrate different magnetic behaviour, suggesting a contribution from a non-Laurentide sourced IRD, most likely derived from ice streams discharging from northeast Atlantic ice sheets such as the British and Fennoscandian ice sheets. These data are consistent with published compositional data from the same core and, given the rapid, highly sensitive and non-destructive nature of the method, suggest that environmental magnetic analysis has considerable potential for characterising IRD materials within Heinrich layers for the purposes of defining provenance. Copyright (C) 2006 John Wiley & Sons, Ltd.

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