AustralieFrV1, Main, Exploration, bibRecord, 008D82

Dissolved rare earth elements tracing lithogenic inputs over the Kerguelen Plateau (Southern Ocean)

Identifieur interne : 008D82 ( Main/Exploration ); précédent : 008D81; suivant : 008D83

Dissolved rare earth elements tracing lithogenic inputs over the Kerguelen Plateau (Southern Ocean)

Auteurs : Y. Zhang [France] ; F. Lacan [France] ; C. Jeandel [France]

Source :

Deep-sea research. Part 2. Topical studies in oceanography [ 0967-0645 ] ; 2008.

RBID : Pascal:08-0300416

Descripteurs français

Pascal (Inist)
- Terre rare, Océan Antarctique, Masse eau, Océan Indien, Concentration, Anomalie, Fractionnement, Basalte, Dissolution, Matériau, Ile, Mésoéchelle, Intrusion, Front polaire, Direction courant, Modèle boîte, Fer, Contrainte, Eau surface, Fertilisation, Plateau Kerguelen, Iles Kerguelen, Kerguelen.
Wicri :
- topic : Océan Antarctique, Océan Indien, Fer.

English descriptors

KwdEn :
- Antarctic Ocean, Box model, Indian Ocean, Kerguelen Islands, Kerguelen Plateau, Mesoscale, Polar front, Water mass, anomalies, basalts, concentration, current directions, dissolution, fertilization, fractionation, intrusions, iron, islands, materials, rare earths, stress, surface water.

Abstract

Dissolved rare earth elements (REEs) were measured in the water masses upstream from and over the Kerguelen Plateau (Indian sector of the Southern Ocean). Upstream from the plateau, the REE profiles were consistent with published data from the Southern and Indian Oceans. Over the plateau (<500m) the following features are observed: (1) higher REE concentrations at most stations, (2) weak Cc anomalies and HREE/LREE fractionations and (3) positive Eu anomalies similar to those of the Kerguelen and Heard basalts. This suggests that the high dissolved-REE contents observed in these waters result from the dissolution of lithogenic material from Kerguelen and/or Heard islands. REE pattern differences between the north and the south of the plateau suggest that both sources could be involved: Kerguelen Island influence in the north, through sporadic mesoscale intrusion of waters through the Polar Front, and Heard Island for the remaining stations, consistent with the main current direction over the Kerguelen Plateau. A one-box model yields a lithogenic-Nd flux, from the dissolution of lithogenic material, of 89±20 t Ndy^-1, and a corresponding dissolved-iron input larger than 100.000t Fe y^-1. However, despite evidence of this significant lithogenic input, dissolved Fe is strongly depleted in the upper layers, contrasting with the enriched REE concentrations. This contrast stresses the different behaviours of REE and iron in the surface waters and the fact that strong fertilization does not imply dissolved Fe-replete waters.

Affiliations:

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Le document en format XML

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<term>basalts</term>
<term>concentration</term>
<term>current directions</term>
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<term>intrusions</term>
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<term>rare earths</term>
<term>stress</term>
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<term>Fractionnement</term>
<term>Basalte</term>
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<term>Intrusion</term>
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<term>Direction courant</term>
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<front><div type="abstract" xml:lang="en">Dissolved rare earth elements (REEs) were measured in the water masses upstream from and over the Kerguelen Plateau (Indian sector of the Southern Ocean). Upstream from the plateau, the REE profiles were consistent with published data from the Southern and Indian Oceans. Over the plateau (<500m) the following features are observed: (1) higher REE concentrations at most stations, (2) weak Cc anomalies and HREE/LREE fractionations and (3) positive Eu anomalies similar to those of the Kerguelen and Heard basalts. This suggests that the high dissolved-REE contents observed in these waters result from the dissolution of lithogenic material from Kerguelen and/or Heard islands. REE pattern differences between the north and the south of the plateau suggest that both sources could be involved: Kerguelen Island influence in the north, through sporadic mesoscale intrusion of waters through the Polar Front, and Heard Island for the remaining stations, consistent with the main current direction over the Kerguelen Plateau. A one-box model yields a lithogenic-Nd flux, from the dissolution of lithogenic material, of 89±20 t Ndy<sup>-1</sup>
, and a corresponding dissolved-iron input larger than 100.000t Fe y<sup>-1</sup>
. However, despite evidence of this significant lithogenic input, dissolved Fe is strongly depleted in the upper layers, contrasting with the enriched REE concentrations. This contrast stresses the different behaviours of REE and iron in the surface waters and the fact that strong fertilization does not imply dissolved Fe-replete waters.</div>
</front>
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Dissolved rare earth elements tracing lithogenic inputs over the Kerguelen Plateau (Southern Ocean)

Dissolved rare earth elements tracing lithogenic inputs over the Kerguelen Plateau (Southern Ocean)

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri