Evidence for intense REE scavenging at cold seeps from the Niger Delta margin
International audience For many trace elements, continental margins are the location of intense exchange processes between sediment and seawater, which control their distribution in the water column, but have yet to be fully understood. In this study, we have investigated the impact of fluid seepage...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://insu.hal.science/insu-00687563 https://insu.hal.science/insu-00687563/document https://insu.hal.science/insu-00687563/file/EPSL-Bollinger-2011.pdf https://doi.org/10.1016/j.epsl.2011.10.008 |
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ftunivbrest:oai:HAL:insu-00687563v1 2024-04-21T07:47:10+00:00 Evidence for intense REE scavenging at cold seeps from the Niger Delta margin Bayon, Germain Birot, Dominique Ruffine, L. Caprais, J.C. Ponzevera, Emmanuel Bollinger, Claire Donval, J.P. Charlou, J.-L. Voisset, M. Grimaud, S. Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Laboratoire Environnement Profond (LEP) Etudes des Ecosystèmes Profonds (EEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Université de Brest (UBO) Centre scientifique et Technique Jean Feger (CSTJF) TOTAL FINA ELF 2011-11-22 https://insu.hal.science/insu-00687563 https://insu.hal.science/insu-00687563/document https://insu.hal.science/insu-00687563/file/EPSL-Bollinger-2011.pdf https://doi.org/10.1016/j.epsl.2011.10.008 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.10.008 insu-00687563 https://insu.hal.science/insu-00687563 https://insu.hal.science/insu-00687563/document https://insu.hal.science/insu-00687563/file/EPSL-Bollinger-2011.pdf doi:10.1016/j.epsl.2011.10.008 info:eu-repo/semantics/OpenAccess ISSN: 0012-821X Earth and Planetary Science Letters https://insu.hal.science/insu-00687563 Earth and Planetary Science Letters, 2011, 312, pp.443-452. ⟨10.1016/j.epsl.2011.10.008⟩ rare earth elements neodymium isotopes seawater cold seeps Fe-Mn oxyhydroxides benthic fluxes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2011 ftunivbrest https://doi.org/10.1016/j.epsl.2011.10.008 2024-04-10T23:44:46Z International audience For many trace elements, continental margins are the location of intense exchange processes between sediment and seawater, which control their distribution in the water column, but have yet to be fully understood. In this study, we have investigated the impact of fluid seepage at cold seeps on the marine cycle of neodymium. We determined dissolved and total dissolvable (TD) concentrations for REE and well-established tracers of fluid seepage (CH4, TDFe, TDMn), and Nd isotopic compositions in seawater samples collected above cold seeps and a reference site (i.e. away from any fluid venting area) from the Niger Delta margin. We also analyzed cold seep authigenic phases and various core-top sediment fractions (pore water, detrital component, easily leachable phases, uncleaned foraminifera) recovered near the hydrocast stations. Methane, TDFe and TDMn concentrations clearly indicate active fluid venting at the studied seeps, with plumes rising up to about 100 m above the seafloor. Depth profiles show pronounced REE enrichments in the non-filtered samples (TD concentrations) within plumes, whereas filtered samples (dissolved concentrations) exhibit slight REE depletion in plumes relative to the overlying water column and display typical seawater REE patterns. These results suggest that the net flux of REE emitted into seawater at cold seeps is controlled by the presence of particulate phases, most probably Fe-Mn oxyhydroxides associated to resuspended sediments. At the reference site, however, our data reveal significant enrichment for dissolved REE in bottom waters, that clearly relates to diffusive benthic fluxes from surface sediments. Neodymium isotopic ratios measured in the water column range from εNd ~−15.7 to − 10.4. Evidence that the εNd values for Antarctic Intermediate waters (AAIW) differed from those reported for the same water mass at open ocean settings shows that sediment/water interactions take place in the Gulf of Guinea. At each site, however, the bottom water εNd signature ... Article in Journal/Newspaper Antarc* Antarctic Université de Bretagne Occidentale: HAL Earth and Planetary Science Letters 312 3-4 443 452 |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
rare earth elements neodymium isotopes seawater cold seeps Fe-Mn oxyhydroxides benthic fluxes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
rare earth elements neodymium isotopes seawater cold seeps Fe-Mn oxyhydroxides benthic fluxes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes Bayon, Germain Birot, Dominique Ruffine, L. Caprais, J.C. Ponzevera, Emmanuel Bollinger, Claire Donval, J.P. Charlou, J.-L. Voisset, M. Grimaud, S. Evidence for intense REE scavenging at cold seeps from the Niger Delta margin |
topic_facet |
rare earth elements neodymium isotopes seawater cold seeps Fe-Mn oxyhydroxides benthic fluxes [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience For many trace elements, continental margins are the location of intense exchange processes between sediment and seawater, which control their distribution in the water column, but have yet to be fully understood. In this study, we have investigated the impact of fluid seepage at cold seeps on the marine cycle of neodymium. We determined dissolved and total dissolvable (TD) concentrations for REE and well-established tracers of fluid seepage (CH4, TDFe, TDMn), and Nd isotopic compositions in seawater samples collected above cold seeps and a reference site (i.e. away from any fluid venting area) from the Niger Delta margin. We also analyzed cold seep authigenic phases and various core-top sediment fractions (pore water, detrital component, easily leachable phases, uncleaned foraminifera) recovered near the hydrocast stations. Methane, TDFe and TDMn concentrations clearly indicate active fluid venting at the studied seeps, with plumes rising up to about 100 m above the seafloor. Depth profiles show pronounced REE enrichments in the non-filtered samples (TD concentrations) within plumes, whereas filtered samples (dissolved concentrations) exhibit slight REE depletion in plumes relative to the overlying water column and display typical seawater REE patterns. These results suggest that the net flux of REE emitted into seawater at cold seeps is controlled by the presence of particulate phases, most probably Fe-Mn oxyhydroxides associated to resuspended sediments. At the reference site, however, our data reveal significant enrichment for dissolved REE in bottom waters, that clearly relates to diffusive benthic fluxes from surface sediments. Neodymium isotopic ratios measured in the water column range from εNd ~−15.7 to − 10.4. Evidence that the εNd values for Antarctic Intermediate waters (AAIW) differed from those reported for the same water mass at open ocean settings shows that sediment/water interactions take place in the Gulf of Guinea. At each site, however, the bottom water εNd signature ... |
author2 |
Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Laboratoire Environnement Profond (LEP) Etudes des Ecosystèmes Profonds (EEP) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Université de Brest (UBO) Centre scientifique et Technique Jean Feger (CSTJF) TOTAL FINA ELF |
format |
Article in Journal/Newspaper |
author |
Bayon, Germain Birot, Dominique Ruffine, L. Caprais, J.C. Ponzevera, Emmanuel Bollinger, Claire Donval, J.P. Charlou, J.-L. Voisset, M. Grimaud, S. |
author_facet |
Bayon, Germain Birot, Dominique Ruffine, L. Caprais, J.C. Ponzevera, Emmanuel Bollinger, Claire Donval, J.P. Charlou, J.-L. Voisset, M. Grimaud, S. |
author_sort |
Bayon, Germain |
title |
Evidence for intense REE scavenging at cold seeps from the Niger Delta margin |
title_short |
Evidence for intense REE scavenging at cold seeps from the Niger Delta margin |
title_full |
Evidence for intense REE scavenging at cold seeps from the Niger Delta margin |
title_fullStr |
Evidence for intense REE scavenging at cold seeps from the Niger Delta margin |
title_full_unstemmed |
Evidence for intense REE scavenging at cold seeps from the Niger Delta margin |
title_sort |
evidence for intense ree scavenging at cold seeps from the niger delta margin |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://insu.hal.science/insu-00687563 https://insu.hal.science/insu-00687563/document https://insu.hal.science/insu-00687563/file/EPSL-Bollinger-2011.pdf https://doi.org/10.1016/j.epsl.2011.10.008 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://insu.hal.science/insu-00687563 Earth and Planetary Science Letters, 2011, 312, pp.443-452. ⟨10.1016/j.epsl.2011.10.008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.10.008 insu-00687563 https://insu.hal.science/insu-00687563 https://insu.hal.science/insu-00687563/document https://insu.hal.science/insu-00687563/file/EPSL-Bollinger-2011.pdf doi:10.1016/j.epsl.2011.10.008 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2011.10.008 |
container_title |
Earth and Planetary Science Letters |
container_volume |
312 |
container_issue |
3-4 |
container_start_page |
443 |
op_container_end_page |
452 |
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1796945669788794880 |