Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean
The bulk of particulate transition metals transported by Patagonian rivers shows an upper crustal composition. Riverine particulate 0.5 N HCl leachable trace metal concentrations are mainly controlled by Fe-oxides. Complexation of Fe by dissolved organic carbon (DOC) appears to be an important deter...
Published in: | Geochimica et Cosmochimica Acta |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://oatao.univ-toulouse.fr/3441/ https://oatao.univ-toulouse.fr/3441/1/Gaiero_3441.pdf https://doi.org/10.1016/S0016-7037(03)00211-4 |
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:3441 2023-11-12T04:04:44+01:00 Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean Gaiero, Diego M. Probst, Jean-Luc Depetris, Pedro J. Bidart, Susana M. Leleyter, Lydia Universidad Nacional de Cordoba - UNC (ARGENTINA) Institut de Recherche pour le Développement - IRD (FRANCE) Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Université de Caen Basse-Normandie (FRANCE) Centre National de la Recherche Scientifique - CNRS (FRANCE) Université Louis Pasteur-Strasbourg I - ULP (FRANCE) Universidad Nacional del Sur - UNS (ARGENTINA) 2003-10 application/pdf https://oatao.univ-toulouse.fr/3441/ https://oatao.univ-toulouse.fr/3441/1/Gaiero_3441.pdf https://doi.org/10.1016/S0016-7037(03)00211-4 en eng Elsevier https://oatao.univ-toulouse.fr/3441/1/Gaiero_3441.pdf HAL : hal-04258897 Gaiero, Diego M. and Probst, Jean-Luc and Depetris, Pedro J. and Bidart, Susana M. and Leleyter, Lydia. Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean. (2003) Geochimica et Cosmochimica Acta, 6 (19). 3603-3623. ISSN 0016-7037 info:eu-repo/semantics/openAccess Géochimie Iron Patagonia riverborne Atlantic Ocean Aeolian Article PeerReviewed info:eu-repo/semantics/article 2003 ftunivtoulouseoa https://doi.org/10.1016/S0016-7037(03)00211-4 2023-10-31T23:28:37Z The bulk of particulate transition metals transported by Patagonian rivers shows an upper crustal composition. Riverine particulate 0.5 N HCl leachable trace metal concentrations are mainly controlled by Fe-oxides. Complexation of Fe by dissolved organic carbon (DOC) appears to be an important determinant of the phases transporting trace metals in Patagonian rivers. In contrast, aeolian trace elements have a combined crustal and anthropogenic origin. Aeolian materials have Fe, Mn, and Al contents similar to that found in regional topsoils. However, seasonal concentrations of some metals (e.g., Co, Pb, Cu, and Zn) are much higher than expected from normal crustal weathering and are likely pollutant derived. We estimate that Patagonian sediments are supplied to the South Atlantic shelf in approximately equivalent amounts from the atmosphere (30 106 T yr1) and coastal erosion (40 106 T yr1) with much less coming from the rivers (2.0 106 T yr1). Low trace metal riverine fluxes are linked to the low suspended particulate load of Patagonian rivers, inasmuch most of it is retained in pro-glacial lakes as well as in downstream reservoirs. Based on our estimation of aeolian dust fluxes at the Patagonian coastline, the high nutrient-low chlorophyll sub Antarctic South Atlantic could receive 1.0 to 4.0 mg m2 yr1 of leachable (0.5 N HCl) Fe. Past and present volcanic activity in the southern Andes—through the ejection of tephra—must be highlighted as another important source of Fe to the South Atlantic Ocean. Based on the 1991 Hudson volcano eruption, it appears that volcanic events can contribute several thousand-fold the mass of “leachable” Fe to the ocean as is introduced by annual Patagonian dust fallout. Article in Journal/Newspaper Antarc* Antarctic South Atlantic Ocean OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) Antarctic Hudson Patagonia Geochimica et Cosmochimica Acta 67 19 3603 3623 |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Géochimie Iron Patagonia riverborne Atlantic Ocean Aeolian |
spellingShingle |
Géochimie Iron Patagonia riverborne Atlantic Ocean Aeolian Gaiero, Diego M. Probst, Jean-Luc Depetris, Pedro J. Bidart, Susana M. Leleyter, Lydia Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean |
topic_facet |
Géochimie Iron Patagonia riverborne Atlantic Ocean Aeolian |
description |
The bulk of particulate transition metals transported by Patagonian rivers shows an upper crustal composition. Riverine particulate 0.5 N HCl leachable trace metal concentrations are mainly controlled by Fe-oxides. Complexation of Fe by dissolved organic carbon (DOC) appears to be an important determinant of the phases transporting trace metals in Patagonian rivers. In contrast, aeolian trace elements have a combined crustal and anthropogenic origin. Aeolian materials have Fe, Mn, and Al contents similar to that found in regional topsoils. However, seasonal concentrations of some metals (e.g., Co, Pb, Cu, and Zn) are much higher than expected from normal crustal weathering and are likely pollutant derived. We estimate that Patagonian sediments are supplied to the South Atlantic shelf in approximately equivalent amounts from the atmosphere (30 106 T yr1) and coastal erosion (40 106 T yr1) with much less coming from the rivers (2.0 106 T yr1). Low trace metal riverine fluxes are linked to the low suspended particulate load of Patagonian rivers, inasmuch most of it is retained in pro-glacial lakes as well as in downstream reservoirs. Based on our estimation of aeolian dust fluxes at the Patagonian coastline, the high nutrient-low chlorophyll sub Antarctic South Atlantic could receive 1.0 to 4.0 mg m2 yr1 of leachable (0.5 N HCl) Fe. Past and present volcanic activity in the southern Andes—through the ejection of tephra—must be highlighted as another important source of Fe to the South Atlantic Ocean. Based on the 1991 Hudson volcano eruption, it appears that volcanic events can contribute several thousand-fold the mass of “leachable” Fe to the ocean as is introduced by annual Patagonian dust fallout. |
author2 |
Universidad Nacional de Cordoba - UNC (ARGENTINA) Institut de Recherche pour le Développement - IRD (FRANCE) Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Université de Caen Basse-Normandie (FRANCE) Centre National de la Recherche Scientifique - CNRS (FRANCE) Université Louis Pasteur-Strasbourg I - ULP (FRANCE) Universidad Nacional del Sur - UNS (ARGENTINA) |
format |
Article in Journal/Newspaper |
author |
Gaiero, Diego M. Probst, Jean-Luc Depetris, Pedro J. Bidart, Susana M. Leleyter, Lydia |
author_facet |
Gaiero, Diego M. Probst, Jean-Luc Depetris, Pedro J. Bidart, Susana M. Leleyter, Lydia |
author_sort |
Gaiero, Diego M. |
title |
Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean |
title_short |
Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean |
title_full |
Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean |
title_fullStr |
Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean |
title_full_unstemmed |
Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean |
title_sort |
iron and other transition metals in patagonian riverborne and windborne materials: geochemical control and transport to the southern south atlantic ocean |
publisher |
Elsevier |
publishDate |
2003 |
url |
https://oatao.univ-toulouse.fr/3441/ https://oatao.univ-toulouse.fr/3441/1/Gaiero_3441.pdf https://doi.org/10.1016/S0016-7037(03)00211-4 |
geographic |
Antarctic Hudson Patagonia |
geographic_facet |
Antarctic Hudson Patagonia |
genre |
Antarc* Antarctic South Atlantic Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean |
op_relation |
https://oatao.univ-toulouse.fr/3441/1/Gaiero_3441.pdf HAL : hal-04258897 Gaiero, Diego M. and Probst, Jean-Luc and Depetris, Pedro J. and Bidart, Susana M. and Leleyter, Lydia. Iron and other transition metals in Patagonian riverborne and windborne materials: Geochemical control and transport to the southern South Atlantic Ocean. (2003) Geochimica et Cosmochimica Acta, 6 (19). 3603-3623. ISSN 0016-7037 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/S0016-7037(03)00211-4 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
67 |
container_issue |
19 |
container_start_page |
3603 |
op_container_end_page |
3623 |
_version_ |
1782341754236698624 |