Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe.
International audience The Early Toarcian oceanic anoxic event (OAE) is associated with a rapid and severe environmental change whose causes are still a matter of debate. A new paleoenvironmental interpretation is proposed, based on a multidisciplinary dataset (chemical, mineralogical and paleontolo...
Published in: | Chemical Geology |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://doi.org/10.1016/j.chemgeo.2013.01.003 https://hal.archives-ouvertes.fr/hal-00789112 |
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English |
topic |
Early Toarcian Oceanic anoxic event Paleoenvironment Trace metals Productivity Paris Basin geo envir |
spellingShingle |
Early Toarcian Oceanic anoxic event Paleoenvironment Trace metals Productivity Paris Basin geo envir Lézin, Carine Andreu, Bernard Pellenard, Pierre Bouchez, Jean-Luc Emmanuel, Laurent Fauré, Philippe Landrein, Philippe Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe. |
topic_facet |
Early Toarcian Oceanic anoxic event Paleoenvironment Trace metals Productivity Paris Basin geo envir |
description |
International audience The Early Toarcian oceanic anoxic event (OAE) is associated with a rapid and severe environmental change whose causes are still a matter of debate. A new paleoenvironmental interpretation is proposed, based on a multidisciplinary dataset (chemical, mineralogical and paleontological) obtained from a borehole drilled by Andra (French National Radioactive Waste Management Agency) in the Lower Toarcian of the eastern Paris Basin (France). During the earlymost Toarcian (TenuicostatumZone), the presence ofwell oxygenated sea-water is reflected by an abundant and diverse fauna, alongwith paleoredox proxies (U/Al, Mo/Al and V/Al) typical of oxidizing conditions, associated with predominant mechanical weathering on the continent. At the base of the Serpentinum Zone, an important paleoenvironmental change is marked by an initial phase of organic matter enrichment (~12% TOC) during the negative shift of δ13C (Carbon Isotope Excursion: CIE). Euxinic/anoxic conditions, indicated by cobalt enrichment and the development of framboidal pyrite, lead to the disappearance of the benthic and pelagic fauna and alloworganic matter to be preserved in the sediments. At this time, the lowconcentration of paleoproductivity proxies (Cd, P, Ni and Zn) suggests weak chemical weathering on the continent due to a rather arid climate. Low concentrations of Sr and coccoliths are due to an input of fresh water probably coming from the Arctic through the Laurasian seaway. Thus, the isolation of the Paris Basin from the Tethyan realm and the influx of freshwater favour haline stratification and the preservation of organic matter. Following the CIE, oxygen concentration gradually increases up to amaximumflooding surface dated as coevalwith the Serpentinum Zone, Elegantulum Subzone. Paleoproductivity proxies indicate a weak primary productivity. The top of the Lower Toarcian is characterized by a second enrichment in organic matter (~12% TOC) due to an important input of nutrients. This enhanced primary production generates ... |
author2 |
Géosciences Environnement Toulouse (GET) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD) Biogéosciences UMR 6282 Dijon (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Muséum d'Histoire Naturelle de Toulouse Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA) Study funded by GNR FORPRO. |
format |
Article in Journal/Newspaper |
author |
Lézin, Carine Andreu, Bernard Pellenard, Pierre Bouchez, Jean-Luc Emmanuel, Laurent Fauré, Philippe Landrein, Philippe |
author_facet |
Lézin, Carine Andreu, Bernard Pellenard, Pierre Bouchez, Jean-Luc Emmanuel, Laurent Fauré, Philippe Landrein, Philippe |
author_sort |
Lézin, Carine |
title |
Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe. |
title_short |
Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe. |
title_full |
Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe. |
title_fullStr |
Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe. |
title_full_unstemmed |
Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe. |
title_sort |
geochemical disturbance and paleoenvironmental changes during the early toarcian in nw europe. |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://doi.org/10.1016/j.chemgeo.2013.01.003 https://hal.archives-ouvertes.fr/hal-00789112 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0009-2541 Chemical Geology Chemical Geology, Elsevier, 2013, 341, pp.1-15. ⟨10.1016/j.chemgeo.2013.01.003⟩ |
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hal-00789112 doi:10.1016/j.chemgeo.2013.01.003 10670/1.p09avg https://hal.archives-ouvertes.fr/hal-00789112 |
op_rights |
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op_doi |
https://doi.org/10.1016/j.chemgeo.2013.01.003 |
container_title |
Chemical Geology |
container_volume |
341 |
container_start_page |
1 |
op_container_end_page |
15 |
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spelling |
fttriple:oai:gotriple.eu:10670/1.p09avg 2023-05-15T15:15:30+02:00 Geochemical disturbance and paleoenvironmental changes during the Early Toarcian in NW Europe. Lézin, Carine Andreu, Bernard Pellenard, Pierre Bouchez, Jean-Luc Emmanuel, Laurent Fauré, Philippe Landrein, Philippe Géosciences Environnement Toulouse (GET) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP) Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD) Biogéosciences UMR 6282 Dijon (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Muséum d'Histoire Naturelle de Toulouse Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA) Study funded by GNR FORPRO. 2013-03-11 https://doi.org/10.1016/j.chemgeo.2013.01.003 https://hal.archives-ouvertes.fr/hal-00789112 en eng HAL CCSD Elsevier hal-00789112 doi:10.1016/j.chemgeo.2013.01.003 10670/1.p09avg https://hal.archives-ouvertes.fr/hal-00789112 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 0009-2541 Chemical Geology Chemical Geology, Elsevier, 2013, 341, pp.1-15. ⟨10.1016/j.chemgeo.2013.01.003⟩ Early Toarcian Oceanic anoxic event Paleoenvironment Trace metals Productivity Paris Basin geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.1016/j.chemgeo.2013.01.003 2023-01-22T16:54:38Z International audience The Early Toarcian oceanic anoxic event (OAE) is associated with a rapid and severe environmental change whose causes are still a matter of debate. A new paleoenvironmental interpretation is proposed, based on a multidisciplinary dataset (chemical, mineralogical and paleontological) obtained from a borehole drilled by Andra (French National Radioactive Waste Management Agency) in the Lower Toarcian of the eastern Paris Basin (France). During the earlymost Toarcian (TenuicostatumZone), the presence ofwell oxygenated sea-water is reflected by an abundant and diverse fauna, alongwith paleoredox proxies (U/Al, Mo/Al and V/Al) typical of oxidizing conditions, associated with predominant mechanical weathering on the continent. At the base of the Serpentinum Zone, an important paleoenvironmental change is marked by an initial phase of organic matter enrichment (~12% TOC) during the negative shift of δ13C (Carbon Isotope Excursion: CIE). Euxinic/anoxic conditions, indicated by cobalt enrichment and the development of framboidal pyrite, lead to the disappearance of the benthic and pelagic fauna and alloworganic matter to be preserved in the sediments. At this time, the lowconcentration of paleoproductivity proxies (Cd, P, Ni and Zn) suggests weak chemical weathering on the continent due to a rather arid climate. Low concentrations of Sr and coccoliths are due to an input of fresh water probably coming from the Arctic through the Laurasian seaway. Thus, the isolation of the Paris Basin from the Tethyan realm and the influx of freshwater favour haline stratification and the preservation of organic matter. Following the CIE, oxygen concentration gradually increases up to amaximumflooding surface dated as coevalwith the Serpentinum Zone, Elegantulum Subzone. Paleoproductivity proxies indicate a weak primary productivity. The top of the Lower Toarcian is characterized by a second enrichment in organic matter (~12% TOC) due to an important input of nutrients. This enhanced primary production generates ... Article in Journal/Newspaper Arctic Unknown Arctic Chemical Geology 341 1 15 |