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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Published in:Paleoceanography
Main Authors: Fagel, N., Hillaire-Marcel, C., Humblet, M., Brasseur, R., Weis, D., Stevenson, R.
Format: Article in Journal/Newspaper
Language:English
Published: 2004
Subjects:
Online Access:http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211451
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spelling ftvliz:oai:oma.vliz.be:211451 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 Fagel, N. Hillaire-Marcel, C. Humblet, M. Brasseur, R. Weis, D. Stevenson, R. 2004 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211451 en eng info:eu-repo/semantics/altIdentifier/wos/000222657500001 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1029/2003PA000993 http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211451 info:eu-repo/semantics/restrictedAccess %3Ci%3EPaleoceanography+19%283%29%3C%2Fi%3E.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1029%2F2003PA000993%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1029%2F2003PA000993%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2004 ftvliz https://doi.org/10.1029/2003PA000993 2022-05-01T09:40:42Z 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. Article in Journal/Newspaper Denmark Strait Greenland Labrador Sea North Atlantic Deep Water North Atlantic Northeast Atlantic Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) Greenland Mid-Atlantic Ridge Paleoceanography 19 3 n/a n/a
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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.
format Article in Journal/Newspaper
author Fagel, N.
Hillaire-Marcel, C.
Humblet, M.
Brasseur, R.
Weis, D.
Stevenson, R.
spellingShingle Fagel, N.
Hillaire-Marcel, C.
Humblet, M.
Brasseur, R.
Weis, D.
Stevenson, R.
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
author_facet Fagel, N.
Hillaire-Marcel, C.
Humblet, M.
Brasseur, R.
Weis, D.
Stevenson, R.
author_sort Fagel, N.
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
publishDate 2004
url http://www.vliz.be/nl/open-marien-archief?module=ref&refid=211451
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
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container_title Paleoceanography
container_volume 19
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