Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods
International audience Abstract The loss of carbonate production during the Toarcian Oceanic Anoxic Event (T-OAE, ca. 183 Ma) is hypothesized to have been at least partly triggered by ocean acidification linked to magmatism from the Karoo-Ferrar large igneous province (southern Africa and Antarctica...
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Online Access: | https://hal.archives-ouvertes.fr/hal-03860153 https://doi.org/10.1130/G47781.1 |
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ftunivnantes:oai:HAL:hal-03860153v1 2023-05-15T13:57:07+02:00 Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods Müller, Tamás Jurikova, Hana Gutjahr, Marcus Tomašových, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luís Milovský, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2020-08-13 https://hal.archives-ouvertes.fr/hal-03860153 https://doi.org/10.1130/G47781.1 en eng HAL CCSD Geological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1130/G47781.1 hal-03860153 https://hal.archives-ouvertes.fr/hal-03860153 doi:10.1130/G47781.1 ISSN: 0091-7613 EISSN: 0091-7613 Geology https://hal.archives-ouvertes.fr/hal-03860153 Geology, Geological Society of America, 2020, 48 (12), pp.1184-1188. ⟨10.1130/G47781.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2020 ftunivnantes https://doi.org/10.1130/G47781.1 2022-11-23T00:11:52Z International audience Abstract The loss of carbonate production during the Toarcian Oceanic Anoxic Event (T-OAE, ca. 183 Ma) is hypothesized to have been at least partly triggered by ocean acidification linked to magmatism from the Karoo-Ferrar large igneous province (southern Africa and Antarctica). However, the dynamics of acidification have never been directly quantified across the T-OAE. Here, we present the first record of temporal evolution of seawater pH spanning the late Pliensbachian and early Toarcian from the Lusitanian Basin (Portugal) reconstructed on the basis of boron isotopic composition (δ11B) of brachiopod shells. δ11B declines by ∼1‰ across the Pliensbachian-Toarcian boundary (Pl-To) and attains the lowest values (∼12.5‰) just prior to and within the T-OAE, followed by fluctuations and a moderately increasing trend afterwards. The decline in δ11B coincides with decreasing bulk CaCO3 content, in parallel with the two-phase decline in carbonate production observed at global scales and with changes in pCO2 derived from stomatal indices. Seawater pH had declined significantly already prior to the T-OAE, probably due to the repeated emissions of volcanogenic CO2. During the earliest phase of the T-OAE, pH increased for a short period, likely due to intensified continental weathering and organic carbon burial, resulting in atmospheric CO2 drawdown. Subsequently, pH dropped again, reaching the minimum in the middle of the T-OAE. The early Toarcian marine extinction and carbonate collapse were thus driven, in part, by ocean acidification, similar to other Phanerozoic events caused by major CO2 emissions and warming. Article in Journal/Newspaper Antarc* Antarctica Ocean acidification Université de Nantes: HAL-UNIV-NANTES Geology 48 12 1184 1188 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Müller, Tamás Jurikova, Hana Gutjahr, Marcus Tomašových, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luís Milovský, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Abstract The loss of carbonate production during the Toarcian Oceanic Anoxic Event (T-OAE, ca. 183 Ma) is hypothesized to have been at least partly triggered by ocean acidification linked to magmatism from the Karoo-Ferrar large igneous province (southern Africa and Antarctica). However, the dynamics of acidification have never been directly quantified across the T-OAE. Here, we present the first record of temporal evolution of seawater pH spanning the late Pliensbachian and early Toarcian from the Lusitanian Basin (Portugal) reconstructed on the basis of boron isotopic composition (δ11B) of brachiopod shells. δ11B declines by ∼1‰ across the Pliensbachian-Toarcian boundary (Pl-To) and attains the lowest values (∼12.5‰) just prior to and within the T-OAE, followed by fluctuations and a moderately increasing trend afterwards. The decline in δ11B coincides with decreasing bulk CaCO3 content, in parallel with the two-phase decline in carbonate production observed at global scales and with changes in pCO2 derived from stomatal indices. Seawater pH had declined significantly already prior to the T-OAE, probably due to the repeated emissions of volcanogenic CO2. During the earliest phase of the T-OAE, pH increased for a short period, likely due to intensified continental weathering and organic carbon burial, resulting in atmospheric CO2 drawdown. Subsequently, pH dropped again, reaching the minimum in the middle of the T-OAE. The early Toarcian marine extinction and carbonate collapse were thus driven, in part, by ocean acidification, similar to other Phanerozoic events caused by major CO2 emissions and warming. |
author2 |
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Müller, Tamás Jurikova, Hana Gutjahr, Marcus Tomašových, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luís Milovský, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton |
author_facet |
Müller, Tamás Jurikova, Hana Gutjahr, Marcus Tomašových, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luís Milovský, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton |
author_sort |
Müller, Tamás |
title |
Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods |
title_short |
Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods |
title_full |
Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods |
title_fullStr |
Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods |
title_full_unstemmed |
Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods |
title_sort |
ocean acidification during the early toarcian extinction event: evidence from boron isotopes in brachiopods |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.archives-ouvertes.fr/hal-03860153 https://doi.org/10.1130/G47781.1 |
genre |
Antarc* Antarctica Ocean acidification |
genre_facet |
Antarc* Antarctica Ocean acidification |
op_source |
ISSN: 0091-7613 EISSN: 0091-7613 Geology https://hal.archives-ouvertes.fr/hal-03860153 Geology, Geological Society of America, 2020, 48 (12), pp.1184-1188. ⟨10.1130/G47781.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G47781.1 hal-03860153 https://hal.archives-ouvertes.fr/hal-03860153 doi:10.1130/G47781.1 |
op_doi |
https://doi.org/10.1130/G47781.1 |
container_title |
Geology |
container_volume |
48 |
container_issue |
12 |
container_start_page |
1184 |
op_container_end_page |
1188 |
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1766264725383938048 |