A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments
International audience Patagonia is considered to be the most important source of dust from South America that is deposited in surrounding areas, and we present here a systematic Sr and Nd isotopic study of sediment currently being exported. Eolian and suspended riverine sediments from Patagonia hav...
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Online Access: | https://hal.science/hal-03592061 https://hal.science/hal-03592061/document https://hal.science/hal-03592061/file/Gaiero_3395.pdf https://doi.org/10.1016/j.chemgeo.2006.11.003 |
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ftmeteofrance:oai:HAL:hal-03592061v1 2024-09-15T17:46:34+00:00 A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments Gaiero, Diego M. Brunet, Frédéric Probst, Jean-Luc Depetris, Pedro J. CIGeS, FCEFyN Universidad Nacional de Córdoba Argentina Laboratoire des Mécanismes et Transfert en Géologie (LMTG) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) 2007-03-15 https://hal.science/hal-03592061 https://hal.science/hal-03592061/document https://hal.science/hal-03592061/file/Gaiero_3395.pdf https://doi.org/10.1016/j.chemgeo.2006.11.003 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2006.11.003 hal-03592061 https://hal.science/hal-03592061 https://hal.science/hal-03592061/document https://hal.science/hal-03592061/file/Gaiero_3395.pdf doi:10.1016/j.chemgeo.2006.11.003 OATAO: 3395 info:eu-repo/semantics/OpenAccess ISSN: 0009-2541 Chemical Geology https://hal.science/hal-03592061 Chemical Geology, 2007, 238 (1-2), pp.107-120. ⟨10.1016/j.chemgeo.2006.11.003⟩ Patagonia Radiogenic isotopes Major and trace elements Dust source [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2007 ftmeteofrance https://doi.org/10.1016/j.chemgeo.2006.11.003 2024-06-25T00:10:21Z International audience Patagonia is considered to be the most important source of dust from South America that is deposited in surrounding areas, and we present here a systematic Sr and Nd isotopic study of sediment currently being exported. Eolian and suspended riverine sediments from Patagonia have a homogeneous chemical and isotopic composition that results from the mixing of by-products from explosive Andean volcanism, derived from the extensive Jurassic silicic Province of Chon Aike and pyroclastic materials from the basic to intermediate southern Andean Quaternary arc, which are easily denudated and dispersed. The main Andean uplift and the glaciations that began in the Late Tertiary account for the extensive distribution of these sediments in the extra-Andean region. The present geochemical signature of Patagonian sediments was produced during the Pleistocene, along with the onset of the southern Andean explosive arc volcanism. Previously published compositions of sediments from other southern South American source regions, assumed to be representative of Patagonia, are distinct from our data. Considering the alleged importance of Patagonia as a dust source for different depositional environments in southern latitudes, it is surprising to verify that the chemical and isotopic signatures of Patagonian-sourced sediments are different from those of sediments from the Southern Ocean, the Pampean Region or the Antarctic ice. Sediments from these areas have a crustal-like geochemical signature reflecting a mixed origin with sediment from other southern South American sources, whereas Patagonian sediments likely represent the basic to intermediate end-member composition. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Météo-France: HAL Chemical Geology 238 1-2 107 120 |
institution |
Open Polar |
collection |
Météo-France: HAL |
op_collection_id |
ftmeteofrance |
language |
English |
topic |
Patagonia Radiogenic isotopes Major and trace elements Dust source [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Patagonia Radiogenic isotopes Major and trace elements Dust source [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Gaiero, Diego M. Brunet, Frédéric Probst, Jean-Luc Depetris, Pedro J. A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments |
topic_facet |
Patagonia Radiogenic isotopes Major and trace elements Dust source [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Patagonia is considered to be the most important source of dust from South America that is deposited in surrounding areas, and we present here a systematic Sr and Nd isotopic study of sediment currently being exported. Eolian and suspended riverine sediments from Patagonia have a homogeneous chemical and isotopic composition that results from the mixing of by-products from explosive Andean volcanism, derived from the extensive Jurassic silicic Province of Chon Aike and pyroclastic materials from the basic to intermediate southern Andean Quaternary arc, which are easily denudated and dispersed. The main Andean uplift and the glaciations that began in the Late Tertiary account for the extensive distribution of these sediments in the extra-Andean region. The present geochemical signature of Patagonian sediments was produced during the Pleistocene, along with the onset of the southern Andean explosive arc volcanism. Previously published compositions of sediments from other southern South American source regions, assumed to be representative of Patagonia, are distinct from our data. Considering the alleged importance of Patagonia as a dust source for different depositional environments in southern latitudes, it is surprising to verify that the chemical and isotopic signatures of Patagonian-sourced sediments are different from those of sediments from the Southern Ocean, the Pampean Region or the Antarctic ice. Sediments from these areas have a crustal-like geochemical signature reflecting a mixed origin with sediment from other southern South American sources, whereas Patagonian sediments likely represent the basic to intermediate end-member composition. |
author2 |
CIGeS, FCEFyN Universidad Nacional de Córdoba Argentina Laboratoire des Mécanismes et Transfert en Géologie (LMTG) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Gaiero, Diego M. Brunet, Frédéric Probst, Jean-Luc Depetris, Pedro J. |
author_facet |
Gaiero, Diego M. Brunet, Frédéric Probst, Jean-Luc Depetris, Pedro J. |
author_sort |
Gaiero, Diego M. |
title |
A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments |
title_short |
A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments |
title_full |
A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments |
title_fullStr |
A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments |
title_full_unstemmed |
A uniform isotopic and chemical signature of dust exported from Patagonia: Rock sources and occurrence in southern environments |
title_sort |
uniform isotopic and chemical signature of dust exported from patagonia: rock sources and occurrence in southern environments |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-03592061 https://hal.science/hal-03592061/document https://hal.science/hal-03592061/file/Gaiero_3395.pdf https://doi.org/10.1016/j.chemgeo.2006.11.003 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
ISSN: 0009-2541 Chemical Geology https://hal.science/hal-03592061 Chemical Geology, 2007, 238 (1-2), pp.107-120. ⟨10.1016/j.chemgeo.2006.11.003⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2006.11.003 hal-03592061 https://hal.science/hal-03592061 https://hal.science/hal-03592061/document https://hal.science/hal-03592061/file/Gaiero_3395.pdf doi:10.1016/j.chemgeo.2006.11.003 OATAO: 3395 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.chemgeo.2006.11.003 |
container_title |
Chemical Geology |
container_volume |
238 |
container_issue |
1-2 |
container_start_page |
107 |
op_container_end_page |
120 |
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1810494836658143232 |