The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event
International audience Marine and terrestrial sediments of the Valanginian age display a distinct positive δ 13 C excursion, which has recently been interpreted as the expression of an oceanic anoxic episode (OAE) of global importance. Here we evaluate the extent of anaerobic conditions in marine bo...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03641572 https://doi.org/10.1016/j.epsl.2009.12.011 |
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ftccsdartic:oai:HAL:insu-03641572v1 2023-06-06T11:57:32+02:00 The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event Westermann, Stéphane Föllmi, Karl B. Adatte, Thierry Matera, Virginie Schnyder, Johann Fleitmann, Dominik Fiet, Nicolas Ploch, Izabela Duchamp-Alphonse, Stéphanie Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2010 https://hal-insu.archives-ouvertes.fr/insu-03641572 https://doi.org/10.1016/j.epsl.2009.12.011 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2009.12.011 insu-03641572 https://hal-insu.archives-ouvertes.fr/insu-03641572 BIBCODE: 2010E&PSL.290.118W doi:10.1016/j.epsl.2009.12.011 ISSN: 0012-821X Earth and Planetary Science Letters https://hal-insu.archives-ouvertes.fr/insu-03641572 Earth and Planetary Science Letters, 2010, 290, pp.118-131. ⟨10.1016/j.epsl.2009.12.011⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2010 ftccsdartic https://doi.org/10.1016/j.epsl.2009.12.011 2023-04-16T01:03:42Z International audience Marine and terrestrial sediments of the Valanginian age display a distinct positive δ 13 C excursion, which has recently been interpreted as the expression of an oceanic anoxic episode (OAE) of global importance. Here we evaluate the extent of anaerobic conditions in marine bottom waters and explore the mechanisms involved in changing carbon storage on a global scale during this time interval. We asses redox-sensitive trace-element distributions (RSTE; uranium, vanadium, cobalt, arsenic and molybdenum) and the quality and quantity of preserved organic matter (OM) in representative sections along a shelf-basin transect in the western Tethys, in the Polish Basin and on Shatsky Rise. OM-rich layers corresponding in time to the δ 13 C shift are generally rare in the Tethyan sections and if present, the layers are not thicker than several centimetres and total organic carbon (TOC) contents do not surpass 1.68 wt.%. Palynological observations and geochemical properties of the preserved OM suggest a mixed marine and terrestrial origin and deposition in an oxic environment. In the Polish Basin, OM-rich layers show evidence for an important continental component. RSTE exhibit no major enrichments during the δ 13 C excursion in all studied Tethyan sections. RSTE enrichments are, however, observed in the pre- δ 13 C excursion OM-rich "Barrande" levels of the Vocontian Trough. In addition, all Tethyan sections record higher Mn contents during the δ 13 C shift, indicating rather well-oxygenated bottom waters in the western Tethys and the presence of anoxic basins elsewhere, such as the restricted basins of the North Atlantic and Weddell Sea. We propose that the Valanginian δ 13 C shift is the consequence of a combination of increased OM storage in marginal seas and on continents (as a sink of 12 C-enriched organic carbon), coupled with the demise of shallow-water carbonate platforms (diminishing the storage capacity of 13 C-enriched carbonate carbon). As such the Valanginian provides a more faithful ... Article in Journal/Newspaper North Atlantic Weddell Sea Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Weddell Weddell Sea Earth and Planetary Science Letters 290 1-2 118 131 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Westermann, Stéphane Föllmi, Karl B. Adatte, Thierry Matera, Virginie Schnyder, Johann Fleitmann, Dominik Fiet, Nicolas Ploch, Izabela Duchamp-Alphonse, Stéphanie The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Marine and terrestrial sediments of the Valanginian age display a distinct positive δ 13 C excursion, which has recently been interpreted as the expression of an oceanic anoxic episode (OAE) of global importance. Here we evaluate the extent of anaerobic conditions in marine bottom waters and explore the mechanisms involved in changing carbon storage on a global scale during this time interval. We asses redox-sensitive trace-element distributions (RSTE; uranium, vanadium, cobalt, arsenic and molybdenum) and the quality and quantity of preserved organic matter (OM) in representative sections along a shelf-basin transect in the western Tethys, in the Polish Basin and on Shatsky Rise. OM-rich layers corresponding in time to the δ 13 C shift are generally rare in the Tethyan sections and if present, the layers are not thicker than several centimetres and total organic carbon (TOC) contents do not surpass 1.68 wt.%. Palynological observations and geochemical properties of the preserved OM suggest a mixed marine and terrestrial origin and deposition in an oxic environment. In the Polish Basin, OM-rich layers show evidence for an important continental component. RSTE exhibit no major enrichments during the δ 13 C excursion in all studied Tethyan sections. RSTE enrichments are, however, observed in the pre- δ 13 C excursion OM-rich "Barrande" levels of the Vocontian Trough. In addition, all Tethyan sections record higher Mn contents during the δ 13 C shift, indicating rather well-oxygenated bottom waters in the western Tethys and the presence of anoxic basins elsewhere, such as the restricted basins of the North Atlantic and Weddell Sea. We propose that the Valanginian δ 13 C shift is the consequence of a combination of increased OM storage in marginal seas and on continents (as a sink of 12 C-enriched organic carbon), coupled with the demise of shallow-water carbonate platforms (diminishing the storage capacity of 13 C-enriched carbonate carbon). As such the Valanginian provides a more faithful ... |
author2 |
Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Interactions et dynamique des environnements de surface (IDES) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Westermann, Stéphane Föllmi, Karl B. Adatte, Thierry Matera, Virginie Schnyder, Johann Fleitmann, Dominik Fiet, Nicolas Ploch, Izabela Duchamp-Alphonse, Stéphanie |
author_facet |
Westermann, Stéphane Föllmi, Karl B. Adatte, Thierry Matera, Virginie Schnyder, Johann Fleitmann, Dominik Fiet, Nicolas Ploch, Izabela Duchamp-Alphonse, Stéphanie |
author_sort |
Westermann, Stéphane |
title |
The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event |
title_short |
The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event |
title_full |
The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event |
title_fullStr |
The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event |
title_full_unstemmed |
The Valanginian δ 13 C excursion may not be an expression of a global oceanic anoxic event |
title_sort |
valanginian δ 13 c excursion may not be an expression of a global oceanic anoxic event |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03641572 https://doi.org/10.1016/j.epsl.2009.12.011 |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
North Atlantic Weddell Sea |
genre_facet |
North Atlantic Weddell Sea |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal-insu.archives-ouvertes.fr/insu-03641572 Earth and Planetary Science Letters, 2010, 290, pp.118-131. ⟨10.1016/j.epsl.2009.12.011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2009.12.011 insu-03641572 https://hal-insu.archives-ouvertes.fr/insu-03641572 BIBCODE: 2010E&PSL.290.118W doi:10.1016/j.epsl.2009.12.011 |
op_doi |
https://doi.org/10.1016/j.epsl.2009.12.011 |
container_title |
Earth and Planetary Science Letters |
container_volume |
290 |
container_issue |
1-2 |
container_start_page |
118 |
op_container_end_page |
131 |
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1767965773734608896 |