Uranium isotope composition of Eocene marine sediments: does organic matter ?
International audience Oxygen in seawater is a key parameter for the development oflife; changes in dissolved O2 concentrations throughout thePhanerozoic have played a major role in the evolution of marineecosystem s through com plex interactions with dissolvednutrients. However, the precise timing...
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ftbrgm:oai:HAL:insu-03547436v1 2024-05-19T07:36:29+00:00 Uranium isotope composition of Eocene marine sediments: does organic matter ? Bagard, Marie-Laure Dickson, A.J. Disnar, Jean-Robert Jacob, Jérémy Le Milbeau, Claude Davies, M.K. Cohen, A.S. School of Environment, Earth and Ecosystem Sciences Milton Keynes Faculty of Science, Technology, Engineering and Mathematics Milton Keynes The Open University Milton Keynes (OU)-The Open University Milton Keynes (OU) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Biogéosystèmes Continentaux - UMR7327 Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Department of Earth Sciences Oxford University of Oxford School of Geography, Earth and Environmental Sciences Plymouth (SoGEES) Plymouth University Paris, France 2017-08 https://insu.hal.science/insu-03547436 en eng HAL CCSD insu-03547436 https://insu.hal.science/insu-03547436 Goldschmidt 2017 https://insu.hal.science/insu-03547436 Goldschmidt 2017, Aug 2017, Paris, France [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [CHIM.ANAL]Chemical Sciences/Analytical chemistry [CHIM.ORGA]Chemical Sciences/Organic chemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/conferenceObject Conference papers 2017 ftbrgm 2024-05-02T00:12:28Z International audience Oxygen in seawater is a key parameter for the development oflife; changes in dissolved O2 concentrations throughout thePhanerozoic have played a major role in the evolution of marineecosystem s through com plex interactions with dissolvednutrients. However, the precise timing and magnitude of@uctuations in global ocean oxygenation in the past remainpoorly constrained. U stable isotope compositions recorded in marine anoxicsedim ents m ay be used to reconstruct the global extent of m arineanoxia due to their sensitivity to the rem oval @ux of reducedU(IV) from seawater. Nonetheless, it is critical to understandlocal sedim entary processes and their im pact on U isotopefractionation before any global redox inform ation can be inferredfrom A238U variations in the sediments. In particular, previousstudies have suggested that U isotopes could be fractionated byorganic matter in the water column, and that this process mightaCect the isotope value recorded in the sedim ent [1,2]. In this w ork, w e explore the im pact of organic m atter onA238U values measured in Arctic Ocean sediments (IODPExpedition 302) deposited during the Early to Middle Eocene(~56–46 M a), a period characterised by strong hydrographicrestriction and high productivity in the A rctic basin.[1] Holmden, Amini & François (2015), Geochimica etCosmochimica Acta153, 202-215. [2] Hinojosa, Stirling, Reid,Moy & Wilson (2016), Geochimica et Cosmochimica Acta179,89-109 Conference Object Arctic Arctic Ocean BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
institution |
Open Polar |
collection |
BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
op_collection_id |
ftbrgm |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [CHIM.ANAL]Chemical Sciences/Analytical chemistry [CHIM.ORGA]Chemical Sciences/Organic chemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [CHIM.ANAL]Chemical Sciences/Analytical chemistry [CHIM.ORGA]Chemical Sciences/Organic chemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Bagard, Marie-Laure Dickson, A.J. Disnar, Jean-Robert Jacob, Jérémy Le Milbeau, Claude Davies, M.K. Cohen, A.S. Uranium isotope composition of Eocene marine sediments: does organic matter ? |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [CHIM.ANAL]Chemical Sciences/Analytical chemistry [CHIM.ORGA]Chemical Sciences/Organic chemistry [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Oxygen in seawater is a key parameter for the development oflife; changes in dissolved O2 concentrations throughout thePhanerozoic have played a major role in the evolution of marineecosystem s through com plex interactions with dissolvednutrients. However, the precise timing and magnitude of@uctuations in global ocean oxygenation in the past remainpoorly constrained. U stable isotope compositions recorded in marine anoxicsedim ents m ay be used to reconstruct the global extent of m arineanoxia due to their sensitivity to the rem oval @ux of reducedU(IV) from seawater. Nonetheless, it is critical to understandlocal sedim entary processes and their im pact on U isotopefractionation before any global redox inform ation can be inferredfrom A238U variations in the sediments. In particular, previousstudies have suggested that U isotopes could be fractionated byorganic matter in the water column, and that this process mightaCect the isotope value recorded in the sedim ent [1,2]. In this w ork, w e explore the im pact of organic m atter onA238U values measured in Arctic Ocean sediments (IODPExpedition 302) deposited during the Early to Middle Eocene(~56–46 M a), a period characterised by strong hydrographicrestriction and high productivity in the A rctic basin.[1] Holmden, Amini & François (2015), Geochimica etCosmochimica Acta153, 202-215. [2] Hinojosa, Stirling, Reid,Moy & Wilson (2016), Geochimica et Cosmochimica Acta179,89-109 |
author2 |
School of Environment, Earth and Ecosystem Sciences Milton Keynes Faculty of Science, Technology, Engineering and Mathematics Milton Keynes The Open University Milton Keynes (OU)-The Open University Milton Keynes (OU) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Biogéosystèmes Continentaux - UMR7327 Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Department of Earth Sciences Oxford University of Oxford School of Geography, Earth and Environmental Sciences Plymouth (SoGEES) Plymouth University |
format |
Conference Object |
author |
Bagard, Marie-Laure Dickson, A.J. Disnar, Jean-Robert Jacob, Jérémy Le Milbeau, Claude Davies, M.K. Cohen, A.S. |
author_facet |
Bagard, Marie-Laure Dickson, A.J. Disnar, Jean-Robert Jacob, Jérémy Le Milbeau, Claude Davies, M.K. Cohen, A.S. |
author_sort |
Bagard, Marie-Laure |
title |
Uranium isotope composition of Eocene marine sediments: does organic matter ? |
title_short |
Uranium isotope composition of Eocene marine sediments: does organic matter ? |
title_full |
Uranium isotope composition of Eocene marine sediments: does organic matter ? |
title_fullStr |
Uranium isotope composition of Eocene marine sediments: does organic matter ? |
title_full_unstemmed |
Uranium isotope composition of Eocene marine sediments: does organic matter ? |
title_sort |
uranium isotope composition of eocene marine sediments: does organic matter ? |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://insu.hal.science/insu-03547436 |
op_coverage |
Paris, France |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Goldschmidt 2017 https://insu.hal.science/insu-03547436 Goldschmidt 2017, Aug 2017, Paris, France |
op_relation |
insu-03547436 https://insu.hal.science/insu-03547436 |
_version_ |
1799475612885188608 |