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| Titel |
High resolution neodymium characterization along the Mediterranean Sea margins: implications for ɛNd modeling. |
| VerfasserIn |
Mohamed Ayache, Jean-Claude Dutay, Thomas Arsouze, Catherine Jeandel, Sidonie Révillon |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123013
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| Publikation (Nr.) |
 EGU/EGU2016-2178.pdf |
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| Zusammenfassung |
| An extensive compilation of published neodymium (Nd) concentrations and isotopic
compositions (ɛNd) was realized in order to establish a new database and a map (using a high
resolution geological map of the area) of the distribution of these parameters for all the
Mediterranean margins. Data were extracted from different kinds of samples: river solid
discharge deposited on the shelf, sedimentary material collected on the margin or geological
material outcropping above or close to a margin. Additional analyses of surface sediments
were done, in order to improve this dataset in key areas (e.g Sicilian strait). The
Mediterranean margin Nd isotopic signatures vary from non-radiogenic values around the
Gulf of Lions, (ɛNd values -11) to radiogenic values around the Aegean and the
Levantine sub-basins up to +6. Using a high resolution regional oceanic model (1/12∘
of horizontal resolution), ɛNd distribution was simulated for the first time in the
Mediterranean Sea. The high resolution of the model provides the opportunity to study
in more details the processes governing the Nd isotope distribution in the marine
environment.
This work highlights that a significant interannual variability of ɛNd distribution in
seawater could occur. In particular, important hydrological events such as the Eastern
Mediterranean Transient (EMT), associated with deep water formed in the Aegean sub-basin,
could induce a shift in Nd IC at intermediate depths that could be noticeable in the Western
part of the basin. This highlights that the temporal and geographical variations of ɛNd could
represent an interesting insight of Nd as a quasi-conservative tracer of water masses in the
Mediterranean Sea, in particular in the context of paleo-oceanographic applications, i.e. to
explore if EMT-type signatures occurred in the past (Roether et al., 2014, Gacic et al.,
2011). |
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