The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle
International audience The Oceanic Anoxic Event 2, at the Cenomanian-Turonian boundary (∼93.9 Ma), was an episode of widespread burial of organic matter in marine sediments, underlined by a positive carbon-isotope (δ 13 C) excursion observed worldwide. Within this episode of O 2 -depleted conditions...
Published in: | Frontiers in Earth Science |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.sorbonne-universite.fr/hal-03350372 https://hal.sorbonne-universite.fr/hal-03350372/document https://hal.sorbonne-universite.fr/hal-03350372/file/feart-09-703282.pdf https://doi.org/10.3389/feart.2021.703282 |
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ftunivnantes:oai:HAL:hal-03350372v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
cenomanian turonian carbon and nitrogen trace metal elements chemocline reoxygenation [PHYS]Physics [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
cenomanian turonian carbon and nitrogen trace metal elements chemocline reoxygenation [PHYS]Physics [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Riquier, Laurent Cadeau, Pierre Danzelle, Julien Baudin, François Pucéat, Emmanuelle Thomazo, Christophe The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle |
topic_facet |
cenomanian turonian carbon and nitrogen trace metal elements chemocline reoxygenation [PHYS]Physics [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Oceanic Anoxic Event 2, at the Cenomanian-Turonian boundary (∼93.9 Ma), was an episode of widespread burial of organic matter in marine sediments, underlined by a positive carbon-isotope (δ 13 C) excursion observed worldwide. Within this episode of O 2 -depleted conditions, a short interval of cooling, termed as the Plenus Cold Event, has been recorded in many sites and sections in the northern hemisphere (Tethyan domain, Western Interior Seaway, proto-North Atlantic Ocean). But, its record and its impact on the biogeochemical cycles of carbon and nitrogen in the southern part of Central Atlantic Ocean has not been explored yet. Here, we present a detailed geochemical study of the Deep Sea Drilling Project site 367 (Cape Verde) based on a compilation of previous and new data of carbon and nitrogen isotope signals as well as trace element concentrations. The aim of this study is to better constrain the evolution of oxygenation in the water column and the associated changes in nitrogen cycle before and during the Oceanic Anoxic Event 2 in order to understand the paleoceanographic and environmental consequences of the Plenus Cold Event at one of the deepest site of the Central Atlantic Ocean. Our new dataset improves the resolution of the δ 13 C curve for this site, and we propose a new chemo-stratigraphic frame of the carbon excursion allowing for a better identification of the short-term negative carbon isotope excursion associated to the Plenus Cold Event. The detailed evolution of redox-sensitive proxies (Mo, U, V, Fe, Cu, Ni enrichments and C org /P total ) and isotopic signals (δ 13 C org and δ 15 N total ) evidence that this deep site was impacted by this cooling event. While anoxic conditions prevailed in bottom waters before and during the onset of the Oceanic Anoxic Event 2 characterized by euxinic NH 4 + -rich water column, this cooling event was accompanied by reoxygenation of the water column, which had affected the behavior of the redox-sensitive elements and caused ... |
author2 |
Institut des Sciences de la Terre de Paris (iSTeP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Paléoenvironnemements Paléoclimats, Bassins (ISTEP-PPB) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Riquier, Laurent Cadeau, Pierre Danzelle, Julien Baudin, François Pucéat, Emmanuelle Thomazo, Christophe |
author_facet |
Riquier, Laurent Cadeau, Pierre Danzelle, Julien Baudin, François Pucéat, Emmanuelle Thomazo, Christophe |
author_sort |
Riquier, Laurent |
title |
The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle |
title_short |
The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle |
title_full |
The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle |
title_fullStr |
The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle |
title_full_unstemmed |
The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle |
title_sort |
plenus cold event record in the abyssal dsdp site 367 (cape verde, central atlantic): environmental perturbations and impacts on the nitrogen cycle |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.sorbonne-universite.fr/hal-03350372 https://hal.sorbonne-universite.fr/hal-03350372/document https://hal.sorbonne-universite.fr/hal-03350372/file/feart-09-703282.pdf https://doi.org/10.3389/feart.2021.703282 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 2296-6463 Frontiers in Earth Science https://hal.sorbonne-universite.fr/hal-03350372 Frontiers in Earth Science, 2021, 9, ⟨10.3389/feart.2021.703282⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/feart.2021.703282 hal-03350372 https://hal.sorbonne-universite.fr/hal-03350372 https://hal.sorbonne-universite.fr/hal-03350372/document https://hal.sorbonne-universite.fr/hal-03350372/file/feart-09-703282.pdf doi:10.3389/feart.2021.703282 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3389/feart.2021.703282 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1766136885798764544 |
spelling |
ftunivnantes:oai:HAL:hal-03350372v1 2023-05-15T17:37:08+02:00 The Plenus Cold Event Record in the Abyssal DSDP Site 367 (Cape Verde, Central Atlantic): Environmental Perturbations and Impacts on the Nitrogen Cycle Riquier, Laurent Cadeau, Pierre Danzelle, Julien Baudin, François Pucéat, Emmanuelle Thomazo, Christophe Institut des Sciences de la Terre de Paris (iSTeP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Paléoenvironnemements Paléoclimats, Bassins (ISTEP-PPB) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) 2021-08-13 https://hal.sorbonne-universite.fr/hal-03350372 https://hal.sorbonne-universite.fr/hal-03350372/document https://hal.sorbonne-universite.fr/hal-03350372/file/feart-09-703282.pdf https://doi.org/10.3389/feart.2021.703282 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/feart.2021.703282 hal-03350372 https://hal.sorbonne-universite.fr/hal-03350372 https://hal.sorbonne-universite.fr/hal-03350372/document https://hal.sorbonne-universite.fr/hal-03350372/file/feart-09-703282.pdf doi:10.3389/feart.2021.703282 info:eu-repo/semantics/OpenAccess ISSN: 2296-6463 Frontiers in Earth Science https://hal.sorbonne-universite.fr/hal-03350372 Frontiers in Earth Science, 2021, 9, ⟨10.3389/feart.2021.703282⟩ cenomanian turonian carbon and nitrogen trace metal elements chemocline reoxygenation [PHYS]Physics [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.3389/feart.2021.703282 2022-12-07T00:54:41Z International audience The Oceanic Anoxic Event 2, at the Cenomanian-Turonian boundary (∼93.9 Ma), was an episode of widespread burial of organic matter in marine sediments, underlined by a positive carbon-isotope (δ 13 C) excursion observed worldwide. Within this episode of O 2 -depleted conditions, a short interval of cooling, termed as the Plenus Cold Event, has been recorded in many sites and sections in the northern hemisphere (Tethyan domain, Western Interior Seaway, proto-North Atlantic Ocean). But, its record and its impact on the biogeochemical cycles of carbon and nitrogen in the southern part of Central Atlantic Ocean has not been explored yet. Here, we present a detailed geochemical study of the Deep Sea Drilling Project site 367 (Cape Verde) based on a compilation of previous and new data of carbon and nitrogen isotope signals as well as trace element concentrations. The aim of this study is to better constrain the evolution of oxygenation in the water column and the associated changes in nitrogen cycle before and during the Oceanic Anoxic Event 2 in order to understand the paleoceanographic and environmental consequences of the Plenus Cold Event at one of the deepest site of the Central Atlantic Ocean. Our new dataset improves the resolution of the δ 13 C curve for this site, and we propose a new chemo-stratigraphic frame of the carbon excursion allowing for a better identification of the short-term negative carbon isotope excursion associated to the Plenus Cold Event. The detailed evolution of redox-sensitive proxies (Mo, U, V, Fe, Cu, Ni enrichments and C org /P total ) and isotopic signals (δ 13 C org and δ 15 N total ) evidence that this deep site was impacted by this cooling event. While anoxic conditions prevailed in bottom waters before and during the onset of the Oceanic Anoxic Event 2 characterized by euxinic NH 4 + -rich water column, this cooling event was accompanied by reoxygenation of the water column, which had affected the behavior of the redox-sensitive elements and caused ... Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Frontiers in Earth Science 9 |