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 ε Nd ) of seawater over and off the Kerguelen Plateau in the Southern Ocean are presented. The sampling took place during the austral spring bloom in OctoberNovember 2011 (KEOPS2 proj...
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Online Access: | https://doi.org/10.3389/fmars.2018.00426 http://ecite.utas.edu.au/131881 |
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ftunivtasecite:oai:ecite.utas.edu.au:131881 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 Grenier, M Garcia-Solsona, E Lemaitre, N Trull, TW Bouvier, V Nonnotte, P van Beek, P Souhaut, M Lacan, F Jeandel, C 2018 application/pdf https://doi.org/10.3389/fmars.2018.00426 http://ecite.utas.edu.au/131881 en eng Frontiers Research Foundation http://ecite.utas.edu.au/131881/1/131881 - Differentiating lithogenic supplies, water mass transport.pdf http://dx.doi.org/10.3389/fmars.2018.00426 Grenier, M and Garcia-Solsona, E and Lemaitre, N and Trull, TW and Bouvier, V and Nonnotte, P and van Beek, P and Souhaut, M and Lacan, F and Jeandel, C, Differentiating lithogenic supplies, water mass transport, and biological processes on and off the Kerguelen Plateau using rare earth element concentrations and neodymium isotopic compositions, Frontiers in Marine Science, 5, (NOV) Article 426. ISSN 2296-7745 (2018) [Refereed Article] http://ecite.utas.edu.au/131881 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2018 ftunivtasecite https://doi.org/10.3389/fmars.2018.00426 2019-12-13T22:29:47Z Distributions of dissolved rare earth element (REE) concentrations and neodymium isotopic compositions (expressed as ε Nd ) of seawater over and off the Kerguelen Plateau in the Southern Ocean are presented. The sampling took place during the austral spring bloom in OctoberNovember 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 ε Nd in filtered samples. By contrast, the unfiltered sample showed a positive Eu/Eu* and more radiogenic ε Nd . 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 ε Nd ( 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, including surface coatings, barite crystals, and biogenic silica. Article in Journal/Newspaper Heard Island Kerguelen Islands Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean Austral Kerguelen Heard Island Kerguelen Islands Frontiers in Marine Science 5 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Grenier, M Garcia-Solsona, E Lemaitre, N Trull, TW Bouvier, V Nonnotte, P van Beek, P Souhaut, M Lacan, F Jeandel, C 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 |
Earth Sciences Oceanography Chemical Oceanography |
description |
Distributions of dissolved rare earth element (REE) concentrations and neodymium isotopic compositions (expressed as ε Nd ) of seawater over and off the Kerguelen Plateau in the Southern Ocean are presented. The sampling took place during the austral spring bloom in OctoberNovember 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 ε Nd in filtered samples. By contrast, the unfiltered sample showed a positive Eu/Eu* and more radiogenic ε Nd . 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 ε Nd ( 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, including surface coatings, barite crystals, and biogenic silica. |
format |
Article in Journal/Newspaper |
author |
Grenier, M Garcia-Solsona, E Lemaitre, N Trull, TW Bouvier, V Nonnotte, P van Beek, P Souhaut, M Lacan, F Jeandel, C |
author_facet |
Grenier, M Garcia-Solsona, E Lemaitre, N Trull, TW Bouvier, V Nonnotte, P van Beek, P Souhaut, M Lacan, F Jeandel, C |
author_sort |
Grenier, M |
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 Research Foundation |
publishDate |
2018 |
url |
https://doi.org/10.3389/fmars.2018.00426 http://ecite.utas.edu.au/131881 |
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_relation |
http://ecite.utas.edu.au/131881/1/131881 - Differentiating lithogenic supplies, water mass transport.pdf http://dx.doi.org/10.3389/fmars.2018.00426 Grenier, M and Garcia-Solsona, E and Lemaitre, N and Trull, TW and Bouvier, V and Nonnotte, P and van Beek, P and Souhaut, M and Lacan, F and Jeandel, C, Differentiating lithogenic supplies, water mass transport, and biological processes on and off the Kerguelen Plateau using rare earth element concentrations and neodymium isotopic compositions, Frontiers in Marine Science, 5, (NOV) Article 426. ISSN 2296-7745 (2018) [Refereed Article] http://ecite.utas.edu.au/131881 |
op_doi |
https://doi.org/10.3389/fmars.2018.00426 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1766023661887684608 |