Kasemann, Simone A; Klein, Tina; Boyle, Richard A; Ullmann, Clemens V; Aberhan, Martin; Meixner, Anette; Duarte, Luis Vitor; Lenton, Timothy M; Piazza, Veronica; Wood, Rachel A (2025): Boron, carbon and oxygen isotope data from micrite, brachiopods and bivalves from the Early Jurassic Toarcian Oceanic Anoxic Event in SW Europe [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.981213 (DOI registration in progress)
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Published: 2025-06-19
Abstract:
The Toarcian Oceanic Anoxic Event (T-OAE, (T-OAE, ~183 Ma; Early Jurassic) marks a global mass extinction coincident with dramatic changes in climate and ocean circulation, likely driven by large igneous province emplacement. Rapid CO2 release may have induced global warming, widespread ocean deoxygenation, and ocean acidification. To constrain the magnitude of ocean acidification, we present boron (δ11B), carbon (δ13C) and oxygen (δ18O) isotope data from three different carbonate components, lime mud (micrite), rhynchonellid brachiopods (including Soaresirhynchia bouchardi), and bivalves (oyster) Gryphaea. All samples were collected from shallow marine carbonate successions deposited in the NW Tethys: Barranco de la Cañada in Spain, deposited in the Iberian Basin, and Rabaçal/Fonte Coberta in Portugal, deposited in the Lusitanian Basin. Sampling ranged from the latest Pliensbachian Margaritatus Zone to the mid-Toarcian Bifrons Zone. Only data from micrite shows a temporary decrease in δ11B values during the T-OAE, recording an ocean acidification event, which we reproduce using a coupled biogeochemical model. The contrasting stability of δ11B values shown by bivalves and brachiopods suggests that the studied taxa may have been able to physiologically buffer changes in ocean pH, and are therefore poor targets for the interrogation of pH changes in Earth history.
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Related to:
Kasemann, Simone A; Klein, Tina; Boyle, Richard A; Ullmann, Clemens V; Aberhan, Martin; Meixner, Anette; Duarte, Luis Vitor; Lenton, Timothy M; Piazza, Veronica; Wood, Rachel A (in review): Ocean acidification at the Toarcian Anoxic Event captured by boron isotopes in the lime mud record.
References:
Ullmann, Clemens V; Boyle, Richard A; Duarte, Luis Vitor; Hesselbo, Stephen P; Kasemann, Simone A; Klein, Tina; Lenton, Timothy M; Piazza, Veronica; Aberhan, Martin (2020): Warm afterglow from the Toarcian Oceanic Anoxic Event drives the success of deep-adapted brachiopods. Scientific Reports, 10(1), 6549, https://doi.org/10.1038/s41598-020-63487-6
Funding:
German Research Foundation (DFG), grant/award no. 269895748: FOR 2332: Temperature-related stresses as a unifying principle in ancient extinctions (TERSANE)
German Research Foundation (DFG), grant/award no. KA 3192/4-1: Tracing ocean acidification at the Early Jurassic (Pliensbachian – Toarcian) and Permo-Triassic extinction events
Coverage:
Median Latitude: 40.185837 * Median Longitude: -5.824559 * South-bound Latitude: 40.052222 * West-bound Longitude: -8.459278 * North-bound Latitude: 40.398167 * East-bound Longitude: -1.502056
Date/Time Start: 2016-10-27T00:00:00 * Date/Time End: 2017-09-17T00:00:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
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5 datasets
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Datasets listed in this bundled publication
- Kasemann, SA; Klein, T; Boyle, RA et al. (2025): Element mass fractions, element/Ca ratios and carbon, oxygen and boron isotope composition for bivalves and brachiopods from the Early Jurassic Toarcian Oceanic Anoxic Event in SW Europe. https://doi.pangaea.de/10.1594/PANGAEA.981152
- Kasemann, SA; Klein, T; Boyle, RA et al. (2025): Carbon, oxygen and boron isotope compositions for micritic carbonate samples from Rabaçal/Fonte Coberta and Barranco de la Cañada. https://doi.pangaea.de/10.1594/PANGAEA.981181
- Kasemann, SA; Klein, T; Boyle, RA et al. (2025): Additional element mass fraction and element/Ca ratios for brachiopods from Portugal and Spain. https://doi.pangaea.de/10.1594/PANGAEA.981183
- Kasemann, SA; Klein, T; Boyle, RA et al. (2025): Element mass fraction and detrital content data for micritic carbonate samples from Rabaçal/Fonte Coberta (Portugal) and Barranco de la Cañada (Spain). https://doi.pangaea.de/10.1594/PANGAEA.981209
- Kasemann, SA; Klein, T; Boyle, RA et al. (2025): XRD results of mineralogical composition of some selected samples from Rabaçal/Fonte Coberta (Portugal). https://doi.pangaea.de/10.1594/PANGAEA.981210