Differentiating lithogenic supplies, water mass transport, and biological processes On and Off the Kerguelen Plateau using rare earth element concentrations and neodymium isotopic compositions ...

• Main Authors: Grenier, Melanie, Garcia-Solsona, Ester, Lemaitre, Nolwenn, Trull, Thomas W., Bouvier, Vincent, Nonnotte, Philippe, Van Bee, Pieter, Souhaut, Marc, Lacan, Francois, Jeandel, Catherine
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2018
• Subjects: Southern Ocean; Kerguelen Islands; rare earth elements; fractionation; anomalies; lithogenic; biologic; GEOTRACES
• Online Access: https://dx.doi.org/10.3929/ethz-b-000307946; http://hdl.handle.net/20.500.11850/307946

Distributions of dissolved rare earth element (REE) concentrations and neodymium isotopic compositions (expressed as εNd) of seawater over and off the Kerguelen Plateau in the Southern Ocean are presented. The sampling took place during the austral spring bloom in October–November 2011 (KEOPS2 project, GEOTRACES process study) and aimed to further the investigations of the KEOPS1 austral summer study in terms of sources and transport of lithogenic material, and to investigate the impact of local biogeochemical cycles on the REE distributions. The REE signature of the coastal eastern Kerguelen Islands waters was characterized by negative europium anomalies (Eu/Eu*) and negative εNd in filtered samples. By contrast, the unfiltered sample showed a positive Eu/Eu* and more radiogenic εNd. These distinct signatures could reflect either differential dissolution of the local flood basalt minerals or differential leaching of local trachyte veins. The dissolved Kerguelen coastal REE patterns differ from those ... : Frontiers in Marine Science, 5 ...