Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions
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 proje...
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2018
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Online Access: | https://doi.org/10.3389/fmars.2018.00426 https://doaj.org/article/7f2b7cd2de594216866e1b65dc8afe15 |
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ftdoajarticles:oai:doaj.org/article:7f2b7cd2de594216866e1b65dc8afe15 2023-05-15T16:33:55+02:00 Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions Melanie Grenier Ester Garcia-Solsona Nolwenn Lemaitre Thomas W. Trull Vincent Bouvier Philippe Nonnotte Pieter van Beek Marc Souhaut Francois Lacan Catherine Jeandel 2018-11-01T00:00:00Z https://doi.org/10.3389/fmars.2018.00426 https://doaj.org/article/7f2b7cd2de594216866e1b65dc8afe15 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2018.00426/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00426 https://doaj.org/article/7f2b7cd2de594216866e1b65dc8afe15 Frontiers in Marine Science, Vol 5 (2018) Southern Ocean Kerguelen Islands rare earth elements fractionation anomalies lithogenic Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2018 ftdoajarticles https://doi.org/10.3389/fmars.2018.00426 2022-12-31T08:53:54Z 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 observed close to Heard Island, these latter featuring a positive Eu/Eu* and a less radiogenic εNd (Zhang et al., 2008). These differences enabled us to trace the transport of waters (tagged by the Kerguelen REE signature) 200 km downstream from the coastal area, north of the Polar Front. Northward transport of the central Plateau shallow waters, enriched by both local vertical supplies and lateral advection of inputs from Heard Island, was also evident. However, the transport of Kerguelen inputs southeastward across the Polar Front could not be discerned (possibly as a result of rapid dilution or scavenging of REE signatures), although evidence for such transport was found previously using Ra isotopes (Sanial et al., 2015). Comparison of the REE patterns at stations sampled prior, during and at the demise of the bloom revealed diverse fractionations, including production of significant lanthanum and europium anomalies, which are tentatively ascribed to chemical reactions with various inorganic and biogenic phases, ... Article in Journal/Newspaper Heard Island Kerguelen Islands Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Austral Kerguelen Heard Island Kerguelen Islands Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Southern Ocean Kerguelen Islands rare earth elements fractionation anomalies lithogenic Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Southern Ocean Kerguelen Islands rare earth elements fractionation anomalies lithogenic Science Q General. Including nature conservation geographical distribution QH1-199.5 Melanie Grenier Ester Garcia-Solsona Nolwenn Lemaitre Thomas W. Trull Vincent Bouvier Philippe Nonnotte Pieter van Beek Marc Souhaut Francois Lacan Catherine Jeandel Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions |
topic_facet |
Southern Ocean Kerguelen Islands rare earth elements fractionation anomalies lithogenic Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
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 observed close to Heard Island, these latter featuring a positive Eu/Eu* and a less radiogenic εNd (Zhang et al., 2008). These differences enabled us to trace the transport of waters (tagged by the Kerguelen REE signature) 200 km downstream from the coastal area, north of the Polar Front. Northward transport of the central Plateau shallow waters, enriched by both local vertical supplies and lateral advection of inputs from Heard Island, was also evident. However, the transport of Kerguelen inputs southeastward across the Polar Front could not be discerned (possibly as a result of rapid dilution or scavenging of REE signatures), although evidence for such transport was found previously using Ra isotopes (Sanial et al., 2015). Comparison of the REE patterns at stations sampled prior, during and at the demise of the bloom revealed diverse fractionations, including production of significant lanthanum and europium anomalies, which are tentatively ascribed to chemical reactions with various inorganic and biogenic phases, ... |
format |
Article in Journal/Newspaper |
author |
Melanie Grenier Ester Garcia-Solsona Nolwenn Lemaitre Thomas W. Trull Vincent Bouvier Philippe Nonnotte Pieter van Beek Marc Souhaut Francois Lacan Catherine Jeandel |
author_facet |
Melanie Grenier Ester Garcia-Solsona Nolwenn Lemaitre Thomas W. Trull Vincent Bouvier Philippe Nonnotte Pieter van Beek Marc Souhaut Francois Lacan Catherine Jeandel |
author_sort |
Melanie Grenier |
title |
Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions |
title_short |
Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions |
title_full |
Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions |
title_fullStr |
Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions |
title_full_unstemmed |
Differentiating Lithogenic Supplies, Water Mass Transport, and Biological Processes On and Off the Kerguelen Plateau Using Rare Earth Element Concentrations and Neodymium Isotopic Compositions |
title_sort |
differentiating lithogenic supplies, water mass transport, and biological processes on and off the kerguelen plateau using rare earth element concentrations and neodymium isotopic compositions |
publisher |
Frontiers Media S.A. |
publishDate |
2018 |
url |
https://doi.org/10.3389/fmars.2018.00426 https://doaj.org/article/7f2b7cd2de594216866e1b65dc8afe15 |
geographic |
Southern Ocean Austral Kerguelen Heard Island Kerguelen Islands |
geographic_facet |
Southern Ocean Austral Kerguelen Heard Island Kerguelen Islands |
genre |
Heard Island Kerguelen Islands Southern Ocean |
genre_facet |
Heard Island Kerguelen Islands Southern Ocean |
op_source |
Frontiers in Marine Science, Vol 5 (2018) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2018.00426/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2018.00426 https://doaj.org/article/7f2b7cd2de594216866e1b65dc8afe15 |
op_doi |
https://doi.org/10.3389/fmars.2018.00426 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1766023661705232384 |