Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646
We present 40 Sm-Nd isotope measurements of the clay-size (<2 µm) fractions of sediments from the Southern Greenland rise (ODP-646) that span the last 365 kyr. These data track changes in the relative supply of fine particles carried into the deep Labrador Sea by the Western Boundary Under Curren...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.711347 2023-05-15T16:03:57+02:00 Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646 Fagel, Nathalie Hillaire-Marcel, Claude LATITUDE: 58.209300 * LONGITUDE: -48.369100 * DATE/TIME START: 1985-10-03T00:00:00 * DATE/TIME END: 1985-10-13T00:00:00 2006-04-12 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.711347 https://doi.org/10.1594/PANGAEA.711347 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.711347 https://doi.org/10.1594/PANGAEA.711347 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Fagel, Nathalie; Hillaire-Marcel, Claude (2006): Glacial/interglacial instabilities of the Western Boundary Under Current during the last 365 kyr from Sm/Nd ratios of the sedimentary clay-size fractions at ODP site 646 (Labrador Sea). Marine Geology, 232(1-2), 87-99, https://doi.org/10.1016/j.margeo.2006.08.006 105-646 COMPCORE Composite Core Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP Dataset 2006 ftpangaea https://doi.org/10.1594/PANGAEA.711347 https://doi.org/10.1016/j.margeo.2006.08.006 2023-01-20T07:31:20Z We present 40 Sm-Nd isotope measurements of the clay-size (<2 µm) fractions of sediments from the Southern Greenland rise (ODP-646) that span the last 365 kyr. These data track changes in the relative supply of fine particles carried into the deep Labrador Sea by the Western Boundary Under Current (WBUC) back to the fourth glacial-interglacial cycles. Earlier studies revealed three general sources of particles to the core site: (i) Precambrian crustal material from Canada, Greenland, and/or Scandinavia (North American Shield - NAS), (ii) Palaeozoic or younger crustal material from East Greenland, NW Europe, and/or western Scandinavia (Young Crust - YC) and (iii) volcanic material from Iceland and the Mid-Atlantic Ridge (MAR). Clay-size fractions from glacial sediments have the lowest Nd isotopic ratios. Supplies of young crustal particles were similar during glacial oxygen isotope stages (OIS) 2, 6, and 10. In contrast the mean volcanic contributions decreased relative to old craton material from OIS 10 to OIS 6 and then from OIS 6 to OIS 2. The glacial OIS 8 interval displays a mean Sm/Nd ratio similar to those of interglacials OIS 1, 5, and 9. Compared with other interglacials, OIS 7 was marked by a higher YC contribution but a similar ~30% MAR supply. The overall NAS contribution dropped by a factor of 2 during each glacial/interglacial transition, with the MAR contribution broadly replacing it during interglacials. To decipher between higher supplies and/or dilution, particle fluxes from each end member were estimated. Glacial NAS fluxes were systematically higher than interglacial fluxes. During the time interval examined, fine particle supplies to the Labrador Sea were strongly controlled by proximal ice-margin erosion and thus echoed the glacial stage intensity. In contrast, the WBUC-carried MAR supplies from the eastern basins did not change significantly throughout the last 365 kyr, except for a marked increase in surface-sediments that suggests unique modern conditions. Distal WBUC-controlled inputs ... Dataset East Greenland Greenland Iceland Labrador Sea PANGAEA - Data Publisher for Earth & Environmental Science Canada Greenland Mid-Atlantic Ridge ENVELOPE(-48.369100,-48.369100,58.209300,58.209300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
105-646 COMPCORE Composite Core Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP |
spellingShingle |
105-646 COMPCORE Composite Core Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP Fagel, Nathalie Hillaire-Marcel, Claude Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646 |
topic_facet |
105-646 COMPCORE Composite Core Joides Resolution Labrador Sea Leg105 Ocean Drilling Program ODP |
description |
We present 40 Sm-Nd isotope measurements of the clay-size (<2 µm) fractions of sediments from the Southern Greenland rise (ODP-646) that span the last 365 kyr. These data track changes in the relative supply of fine particles carried into the deep Labrador Sea by the Western Boundary Under Current (WBUC) back to the fourth glacial-interglacial cycles. Earlier studies revealed three general sources of particles to the core site: (i) Precambrian crustal material from Canada, Greenland, and/or Scandinavia (North American Shield - NAS), (ii) Palaeozoic or younger crustal material from East Greenland, NW Europe, and/or western Scandinavia (Young Crust - YC) and (iii) volcanic material from Iceland and the Mid-Atlantic Ridge (MAR). Clay-size fractions from glacial sediments have the lowest Nd isotopic ratios. Supplies of young crustal particles were similar during glacial oxygen isotope stages (OIS) 2, 6, and 10. In contrast the mean volcanic contributions decreased relative to old craton material from OIS 10 to OIS 6 and then from OIS 6 to OIS 2. The glacial OIS 8 interval displays a mean Sm/Nd ratio similar to those of interglacials OIS 1, 5, and 9. Compared with other interglacials, OIS 7 was marked by a higher YC contribution but a similar ~30% MAR supply. The overall NAS contribution dropped by a factor of 2 during each glacial/interglacial transition, with the MAR contribution broadly replacing it during interglacials. To decipher between higher supplies and/or dilution, particle fluxes from each end member were estimated. Glacial NAS fluxes were systematically higher than interglacial fluxes. During the time interval examined, fine particle supplies to the Labrador Sea were strongly controlled by proximal ice-margin erosion and thus echoed the glacial stage intensity. In contrast, the WBUC-carried MAR supplies from the eastern basins did not change significantly throughout the last 365 kyr, except for a marked increase in surface-sediments that suggests unique modern conditions. Distal WBUC-controlled inputs ... |
format |
Dataset |
author |
Fagel, Nathalie Hillaire-Marcel, Claude |
author_facet |
Fagel, Nathalie Hillaire-Marcel, Claude |
author_sort |
Fagel, Nathalie |
title |
Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646 |
title_short |
Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646 |
title_full |
Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646 |
title_fullStr |
Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646 |
title_full_unstemmed |
Clay mineralogical assemblages, Sm-Nd concentrations, Sm and Nd isotopic ratios and oxygen isotope ratios, OIS number and the age model of ODP Site 105-646 |
title_sort |
clay mineralogical assemblages, sm-nd concentrations, sm and nd isotopic ratios and oxygen isotope ratios, ois number and the age model of odp site 105-646 |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.711347 https://doi.org/10.1594/PANGAEA.711347 |
op_coverage |
LATITUDE: 58.209300 * LONGITUDE: -48.369100 * DATE/TIME START: 1985-10-03T00:00:00 * DATE/TIME END: 1985-10-13T00:00:00 |
long_lat |
ENVELOPE(-48.369100,-48.369100,58.209300,58.209300) |
geographic |
Canada Greenland Mid-Atlantic Ridge |
geographic_facet |
Canada Greenland Mid-Atlantic Ridge |
genre |
East Greenland Greenland Iceland Labrador Sea |
genre_facet |
East Greenland Greenland Iceland Labrador Sea |
op_source |
Supplement to: Fagel, Nathalie; Hillaire-Marcel, Claude (2006): Glacial/interglacial instabilities of the Western Boundary Under Current during the last 365 kyr from Sm/Nd ratios of the sedimentary clay-size fractions at ODP site 646 (Labrador Sea). Marine Geology, 232(1-2), 87-99, https://doi.org/10.1016/j.margeo.2006.08.006 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.711347 https://doi.org/10.1594/PANGAEA.711347 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.711347 https://doi.org/10.1016/j.margeo.2006.08.006 |
_version_ |
1766399645671489536 |