Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater
International audience Analyses of Chilean river waters indicate that the average yield of unradiogenic Sr (~ 517 mol Sr km− 2 yr− 1, 87Sr/86Sr ~ 0.7057) from western South America (1,220,853 km2) into the southeastern Pacific Ocean is ~ 2-4 times higher than that from Iceland (~ 110 mol Sr km − 2 y...
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ftunivnantes:oai:HAL:hal-01019918v1 2023-05-15T16:51:18+02:00 Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater Fiege, K. Miller C., A. Robinson L., F. Figueroa, R. Peucker-Ehrenbrink, B. Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS) 2009 https://hal.science/hal-01019918 https://doi.org/10.1016/j.chemgeo.2009.09.013 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2009.09.013 hal-01019918 https://hal.science/hal-01019918 doi:10.1016/j.chemgeo.2009.09.013 ISSN: 0009-2541 Chemical Geology https://hal.science/hal-01019918 Chemical Geology, 2009, 268 (3-4), pp.337-343. ⟨10.1016/j.chemgeo.2009.09.013⟩ Strontium River Seawater Chile Andes Weathering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2009 ftunivnantes https://doi.org/10.1016/j.chemgeo.2009.09.013 2023-02-22T11:09:07Z International audience Analyses of Chilean river waters indicate that the average yield of unradiogenic Sr (~ 517 mol Sr km− 2 yr− 1, 87Sr/86Sr ~ 0.7057) from western South America (1,220,853 km2) into the southeastern Pacific Ocean is ~ 2-4 times higher than that from Iceland (~ 110 mol Sr km − 2 yr− 1, 87Sr/86Sr ~ 0.7025) and the Deccan traps, but lower than fluxes of unradiogenic Sr from ocean islands in the Lesser Antilles and Réunion. The Sr flux from western South America accounts for about 1.8% of the annual dissolved Sr delivered to the ocean via rivers. If Chilean rivers analyzed in this study accurately characterize runoff from western South America, active convergent continental margins release about as much unradiogenic Sr to seawater as a 0-1 Myr old mid-ocean ridge segment of equivalent length. Modulations of the flux of unradiogenic Sr from active margins over geologic time scales have to be considered as an additional driving force of change in the marine Sr isotope record, supplementing temporal variations in the submarine hydrothermal flux as a source of unradiogenic Sr to seawater. Such modulations can be driven by changes in the surface exposure of volcanic arc terrains, changes in climate, ocean currents and geographic latitude due to plate tectonics, as well as topographic changes that can affect local rainfall, runoff and erosion. Article in Journal/Newspaper Iceland Université de Nantes: HAL-UNIV-NANTES Pacific Chemical Geology 268 3-4 337 343 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Strontium River Seawater Chile Andes Weathering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Strontium River Seawater Chile Andes Weathering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Fiege, K. Miller C., A. Robinson L., F. Figueroa, R. Peucker-Ehrenbrink, B. Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater |
topic_facet |
Strontium River Seawater Chile Andes Weathering [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Analyses of Chilean river waters indicate that the average yield of unradiogenic Sr (~ 517 mol Sr km− 2 yr− 1, 87Sr/86Sr ~ 0.7057) from western South America (1,220,853 km2) into the southeastern Pacific Ocean is ~ 2-4 times higher than that from Iceland (~ 110 mol Sr km − 2 yr− 1, 87Sr/86Sr ~ 0.7025) and the Deccan traps, but lower than fluxes of unradiogenic Sr from ocean islands in the Lesser Antilles and Réunion. The Sr flux from western South America accounts for about 1.8% of the annual dissolved Sr delivered to the ocean via rivers. If Chilean rivers analyzed in this study accurately characterize runoff from western South America, active convergent continental margins release about as much unradiogenic Sr to seawater as a 0-1 Myr old mid-ocean ridge segment of equivalent length. Modulations of the flux of unradiogenic Sr from active margins over geologic time scales have to be considered as an additional driving force of change in the marine Sr isotope record, supplementing temporal variations in the submarine hydrothermal flux as a source of unradiogenic Sr to seawater. Such modulations can be driven by changes in the surface exposure of volcanic arc terrains, changes in climate, ocean currents and geographic latitude due to plate tectonics, as well as topographic changes that can affect local rainfall, runoff and erosion. |
author2 |
Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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)-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 |
Fiege, K. Miller C., A. Robinson L., F. Figueroa, R. Peucker-Ehrenbrink, B. |
author_facet |
Fiege, K. Miller C., A. Robinson L., F. Figueroa, R. Peucker-Ehrenbrink, B. |
author_sort |
Fiege, K. |
title |
Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater |
title_short |
Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater |
title_full |
Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater |
title_fullStr |
Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater |
title_full_unstemmed |
Strontium isotopes in Chilean rivers: The flux of unradiogenic continental Sr to seawater |
title_sort |
strontium isotopes in chilean rivers: the flux of unradiogenic continental sr to seawater |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-01019918 https://doi.org/10.1016/j.chemgeo.2009.09.013 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ISSN: 0009-2541 Chemical Geology https://hal.science/hal-01019918 Chemical Geology, 2009, 268 (3-4), pp.337-343. ⟨10.1016/j.chemgeo.2009.09.013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2009.09.013 hal-01019918 https://hal.science/hal-01019918 doi:10.1016/j.chemgeo.2009.09.013 |
op_doi |
https://doi.org/10.1016/j.chemgeo.2009.09.013 |
container_title |
Chemical Geology |
container_volume |
268 |
container_issue |
3-4 |
container_start_page |
337 |
op_container_end_page |
343 |
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1766041420396756992 |