Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern.

Nd and Pb isotopes were measured on the fine fraction of one sediment core drilled off southern Greenland. This work aims to reconstruct the evolution of deep circulation patterns in the North Atlantic during the Holocene on the basis of sediment supply variations. For the last 12 kyr, three sources...

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Main Author: Weis, Dominique
Other Authors: University of British Columbia. Pacific Centre for Isotopic and Geochemical Research
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2004
Subjects:
Online Access:http://hdl.handle.net/2429/39103
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spelling ftunivbritcolcir:oai:circle.library.ubc.ca:2429/39103 2023-05-15T16:00:38+02:00 Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern. Weis, Dominique University of British Columbia. Pacific Centre for Isotopic and Geochemical Research 2004 http://hdl.handle.net/2429/39103 eng eng American Geophysical Union Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Low-temperature Geochemistry Text Article 2004 ftunivbritcolcir 2019-10-15T18:07:06Z Nd and Pb isotopes were measured on the fine fraction of one sediment core drilled off southern Greenland. This work aims to reconstruct the evolution of deep circulation patterns in the North Atlantic during the Holocene on the basis of sediment supply variations. For the last 12 kyr, three sources have contributed to the sediment mixture: the North American Shield, the Pan-African and Variscan crusts, and the Mid-Atlantic Ridge. Clay isotope signatures indicate two mixtures of sediment sources. The first mixture (12.2–6.5 ka) is composed of material derived from the North American shield and from a “young” crustal source. From 6.5 ka onward the mixture is characterized by a young crustal component and by a volcanic component characteristic of the Mid-Atlantic Ridge. Since the significant decrease in proximal deglacial supplies, the evolution of the relative contributions of the sediment sources suggests major changes in the relative contributions of the deep water masses carried by the Western Boundary Undercurrent over the past 8.4 kyr. The progressive intensification of the Western Boundary Undercurrent was initially associated mainly with the transport of the Northeast Atlantic Deep Water mass until 6.5 ka and with the Denmark Strait Overflow Water thereafter. The establishment of the modern circulation at 3 ka suggests a reduced influence of the Denmark Strait Overflow Water, synchronous with the full appearance of the Labrador Seawater mass. Our isotopic data set emphasizes several changes in the relative contribution of the two major components of North Atlantic Deep Water throughout the Holocene. An edited version of this paper was published by AGU. Copyright 2004 American Geophysical Union. Science, Faculty of Earth and Ocean Sciences, Department of Reviewed Faculty Article in Journal/Newspaper Denmark Strait Greenland Labrador Sea North Atlantic Deep Water North Atlantic Northeast Atlantic University of British Columbia: cIRcle - UBC's Information Repository Greenland Mid-Atlantic Ridge
institution Open Polar
collection University of British Columbia: cIRcle - UBC's Information Repository
op_collection_id ftunivbritcolcir
language English
topic Low-temperature Geochemistry
spellingShingle Low-temperature Geochemistry
Weis, Dominique
Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern.
topic_facet Low-temperature Geochemistry
description Nd and Pb isotopes were measured on the fine fraction of one sediment core drilled off southern Greenland. This work aims to reconstruct the evolution of deep circulation patterns in the North Atlantic during the Holocene on the basis of sediment supply variations. For the last 12 kyr, three sources have contributed to the sediment mixture: the North American Shield, the Pan-African and Variscan crusts, and the Mid-Atlantic Ridge. Clay isotope signatures indicate two mixtures of sediment sources. The first mixture (12.2–6.5 ka) is composed of material derived from the North American shield and from a “young” crustal source. From 6.5 ka onward the mixture is characterized by a young crustal component and by a volcanic component characteristic of the Mid-Atlantic Ridge. Since the significant decrease in proximal deglacial supplies, the evolution of the relative contributions of the sediment sources suggests major changes in the relative contributions of the deep water masses carried by the Western Boundary Undercurrent over the past 8.4 kyr. The progressive intensification of the Western Boundary Undercurrent was initially associated mainly with the transport of the Northeast Atlantic Deep Water mass until 6.5 ka and with the Denmark Strait Overflow Water thereafter. The establishment of the modern circulation at 3 ka suggests a reduced influence of the Denmark Strait Overflow Water, synchronous with the full appearance of the Labrador Seawater mass. Our isotopic data set emphasizes several changes in the relative contribution of the two major components of North Atlantic Deep Water throughout the Holocene. An edited version of this paper was published by AGU. Copyright 2004 American Geophysical Union. Science, Faculty of Earth and Ocean Sciences, Department of Reviewed Faculty
author2 University of British Columbia. Pacific Centre for Isotopic and Geochemical Research
format Article in Journal/Newspaper
author Weis, Dominique
author_facet Weis, Dominique
author_sort Weis, Dominique
title Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern.
title_short Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern.
title_full Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern.
title_fullStr Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern.
title_full_unstemmed Nd and Pb isotope signatures of the clay-size fraction of Labrador Sea sediments during the Holocene: Implications for the inception of the modern deep circulation pattern.
title_sort nd and pb isotope signatures of the clay-size fraction of labrador sea sediments during the holocene: implications for the inception of the modern deep circulation pattern.
publisher American Geophysical Union
publishDate 2004
url http://hdl.handle.net/2429/39103
geographic Greenland
Mid-Atlantic Ridge
geographic_facet Greenland
Mid-Atlantic Ridge
genre Denmark Strait
Greenland
Labrador Sea
North Atlantic Deep Water
North Atlantic
Northeast Atlantic
genre_facet Denmark Strait
Greenland
Labrador Sea
North Atlantic Deep Water
North Atlantic
Northeast Atlantic
op_rights Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
op_rightsnorm CC-BY-NC-ND
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