New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses
Time series of lead (Pb) and neodymium (Nd) isotope compositions were measured on three ferromanganese crusts recording the evolution of NE Atlantic water masses over the past 15 Ma. The crusts are distributed along a depth profile (∼700-4600 m) comprising the present-day depths of Mediterranean Out...
Published in: | Geochemistry, Geophysics, Geosystems |
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2016
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Online Access: | https://doi.org/10.1029/2007GC001766 https://ora.ox.ac.uk/objects/uuid:4523582b-613d-4089-8fec-74d71770a6c5 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:4523582b-613d-4089-8fec-74d71770a6c5 2024-10-06T13:51:13+00:00 New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses Muinos, S Frank, M Maden, C Hein, JR van de Flierdt, T Lebreiro, S Gaspar, L Monteiro, J Halliday, A 2016-07-28 https://doi.org/10.1029/2007GC001766 https://ora.ox.ac.uk/objects/uuid:4523582b-613d-4089-8fec-74d71770a6c5 unknown doi:10.1029/2007GC001766 https://ora.ox.ac.uk/objects/uuid:4523582b-613d-4089-8fec-74d71770a6c5 https://doi.org/10.1029/2007GC001766 info:eu-repo/semantics/embargoedAccess Journal article 2016 ftuloxford https://doi.org/10.1029/2007GC001766 2024-09-06T07:47:32Z Time series of lead (Pb) and neodymium (Nd) isotope compositions were measured on three ferromanganese crusts recording the evolution of NE Atlantic water masses over the past 15 Ma. The crusts are distributed along a depth profile (∼700-4600 m) comprising the present-day depths of Mediterranean Outflow Water and North East Atlantic Deep Water. A pronounced increase of the 206Pb/204Pb in the two deeper crusts starting at ∼4 Ma and a decrease in 143 Nd/144Nd in all three crusts took place between ∼6-4 Ma and the present. These patterns are similar to isotope time series in the western North Atlantic basin and are consistent with efficient mixing between the two basins. However, the changes occurred 1-3 Ma earlier in the eastern basin indicating that the northeastern Atlantic led the major change in Pb and Nd isotope composition, probably due to a direct supply of Labrador Seawater via a northern route. The Pb isotope evolution during the Pliocene-Pleistocene can generally be explained by mixing between two end-members corresponding to Mediterranean Outflow Water and North East Atlantic Deep Water, but external sources such as Saharan dust are likely to have played a role as well. The Pb isotope composition of the shallowest crust that grew within the present-day Mediterranean Outflow Water does not show significant Pb isotope changes indicating that it was controlled by the same Pb sources throughout the past 15 Ma.Copyright 2008 by the American Geophysical Union. Article in Journal/Newspaper North Atlantic North East Atlantic ORA - Oxford University Research Archive Geochemistry, Geophysics, Geosystems 9 2 n/a n/a |
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ORA - Oxford University Research Archive |
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ftuloxford |
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Time series of lead (Pb) and neodymium (Nd) isotope compositions were measured on three ferromanganese crusts recording the evolution of NE Atlantic water masses over the past 15 Ma. The crusts are distributed along a depth profile (∼700-4600 m) comprising the present-day depths of Mediterranean Outflow Water and North East Atlantic Deep Water. A pronounced increase of the 206Pb/204Pb in the two deeper crusts starting at ∼4 Ma and a decrease in 143 Nd/144Nd in all three crusts took place between ∼6-4 Ma and the present. These patterns are similar to isotope time series in the western North Atlantic basin and are consistent with efficient mixing between the two basins. However, the changes occurred 1-3 Ma earlier in the eastern basin indicating that the northeastern Atlantic led the major change in Pb and Nd isotope composition, probably due to a direct supply of Labrador Seawater via a northern route. The Pb isotope evolution during the Pliocene-Pleistocene can generally be explained by mixing between two end-members corresponding to Mediterranean Outflow Water and North East Atlantic Deep Water, but external sources such as Saharan dust are likely to have played a role as well. The Pb isotope composition of the shallowest crust that grew within the present-day Mediterranean Outflow Water does not show significant Pb isotope changes indicating that it was controlled by the same Pb sources throughout the past 15 Ma.Copyright 2008 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Muinos, S Frank, M Maden, C Hein, JR van de Flierdt, T Lebreiro, S Gaspar, L Monteiro, J Halliday, A |
spellingShingle |
Muinos, S Frank, M Maden, C Hein, JR van de Flierdt, T Lebreiro, S Gaspar, L Monteiro, J Halliday, A New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses |
author_facet |
Muinos, S Frank, M Maden, C Hein, JR van de Flierdt, T Lebreiro, S Gaspar, L Monteiro, J Halliday, A |
author_sort |
Muinos, S |
title |
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses |
title_short |
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses |
title_full |
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses |
title_fullStr |
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses |
title_full_unstemmed |
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses |
title_sort |
new constraints on the pb and nd isotopic evolution of ne atlantic water masses |
publishDate |
2016 |
url |
https://doi.org/10.1029/2007GC001766 https://ora.ox.ac.uk/objects/uuid:4523582b-613d-4089-8fec-74d71770a6c5 |
genre |
North Atlantic North East Atlantic |
genre_facet |
North Atlantic North East Atlantic |
op_relation |
doi:10.1029/2007GC001766 https://ora.ox.ac.uk/objects/uuid:4523582b-613d-4089-8fec-74d71770a6c5 https://doi.org/10.1029/2007GC001766 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1029/2007GC001766 |
container_title |
Geochemistry, Geophysics, Geosystems |
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9 |
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2 |
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n/a |
_version_ |
1812179407227322368 |