Neodymium isotopic composition and rare earth element concentrations in the deep and intermediate Nordic Seas: Constraints on the Iceland Scotland Overflow Water signature

Type Article
Date 2004-11-06
Language English
Author(s) Lacan F1, Jeandel C1
Affiliation(s) 1 : LEGOS, Observatoire Midi Pyrénées, Toulouse, France
Source Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2004-11-06 , Vol. 5 , N. 11 , P. 1-10
DOI 10.1029/2004GC000742
WOS© Times Cited 81
Keyword(s) Iceland Scotland Overflow Water, neodymium isotopic composition, Nordic Seas, North Atlantic, rare earth, sediment water mass interactions, paleoceanography, water masses, geochemistry
Abstract Neodymium isotopic composition and rare earth element concentrations were measured in seawater samples from eleven stations in the Nordic Seas. These data allow us to study how the Iceland Scotland Overflow Water ( ISOW) acquires its neodymium signature in the modern ocean. The waters overflowing the Faroe Shetland channel are characterized by epsilon(Nd) = -8.2 +/- 0.6, in good agreement with the only other data point, published 19 years ago. In the Greenland and Iceland Seas the water masses leading to the formation of the ISOW display lower neodymium isotopic composition, with epsilon(Nd) around -11 and -9, respectively. Since no water masses in the Nordic Seas are characterized by epsilon(Nd) > -8, the radiogenic signature of the ISOW likely reflects inputs from the highly radiogenic Norwegian Basin basaltic margins ( Jan-Mayen, Iceland, Faroe, with epsilon(Nd) approximate to + 7). In addition to the neodymium isotopic composition, the rare earth element patterns suggest that these inputs occur via the remobilization ( which includes resuspension and dissolution) of sediments deposited on the margins. Whereas the neodymium isotopic composition behaves conservatively in the oceans in the absence of lithogenic inputs, and can be used as a water mass tracer, these results emphasize the role of interactions, between sediments deposited on margins and seawater, in the acquisition of the neodymium isotopic composition of water masses. These results should allow a better use of this parameter to trace the present and the past circulation in the North Atlantic.
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Lacan F, Jeandel C (2004). Neodymium isotopic composition and rare earth element concentrations in the deep and intermediate Nordic Seas: Constraints on the Iceland Scotland Overflow Water signature. Geochemistry Geophysics Geosystems, 5(11), 1-10. Publisher's official version : https://doi.org/10.1029/2004GC000742 , Open Access version : https://archimer.ifremer.fr/doc/00228/33924/