Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods
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 acid...
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2020
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ftoceanrep:oai:oceanrep.geomar.de:50454 2023-05-15T13:52:14+02:00 Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods Müller, Tamas Jurikova, Hana Gutjahr, Marcus Tomasovych, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luis v. Milovsky, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton 2020-12 text https://oceanrep.geomar.de/id/eprint/50454/ https://oceanrep.geomar.de/id/eprint/50454/1/g47781.pdf https://doi.org/10.1130/G47781.1 en eng GSA (Geological Society of America) https://oceanrep.geomar.de/id/eprint/50454/1/g47781.pdf Müller, T., Jurikova, H., Gutjahr, M. , Tomasovych, A., Schlögl, J., Liebetrau, V., Duarte, L. v., Milovsky, R., Suan, G., Mattioli, E., Pittet, B. and Eisenhauer, A. (2020) Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods. Open Access Geology, 48 (12). pp. 1184-1188. DOI 10.1130/G47781.1 <https://doi.org/10.1130/G47781.1>. doi:10.1130/G47781.1 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2020 ftoceanrep https://doi.org/10.1130/G47781.1 2023-04-07T15:51:42Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Geology 48 12 1184 1188 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Müller, Tamas Jurikova, Hana Gutjahr, Marcus Tomasovych, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luis v. Milovsky, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton |
spellingShingle |
Müller, Tamas Jurikova, Hana Gutjahr, Marcus Tomasovych, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luis v. Milovsky, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods |
author_facet |
Müller, Tamas Jurikova, Hana Gutjahr, Marcus Tomasovych, Adam Schlögl, Jan Liebetrau, Volker Duarte, Luis v. Milovsky, Rastislav Suan, Guillaume Mattioli, Emanuela Pittet, Bernard Eisenhauer, Anton |
author_sort |
Müller, Tamas |
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 |
GSA (Geological Society of America) |
publishDate |
2020 |
url |
https://oceanrep.geomar.de/id/eprint/50454/ https://oceanrep.geomar.de/id/eprint/50454/1/g47781.pdf https://doi.org/10.1130/G47781.1 |
genre |
Antarc* Antarctica Ocean acidification |
genre_facet |
Antarc* Antarctica Ocean acidification |
op_relation |
https://oceanrep.geomar.de/id/eprint/50454/1/g47781.pdf Müller, T., Jurikova, H., Gutjahr, M. , Tomasovych, A., Schlögl, J., Liebetrau, V., Duarte, L. v., Milovsky, R., Suan, G., Mattioli, E., Pittet, B. and Eisenhauer, A. (2020) Ocean acidification during the early Toarcian extinction event: Evidence from boron isotopes in brachiopods. Open Access Geology, 48 (12). pp. 1184-1188. DOI 10.1130/G47781.1 <https://doi.org/10.1130/G47781.1>. doi:10.1130/G47781.1 |
op_rights |
info:eu-repo/semantics/openAccess |
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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1766256516304732160 |