Atkinson, JW and Wignall, PB orcid.org/0000-0003-0074-9129 (2019) How quick was marine recovery after the end-Triassic mass extinction and what role did anoxia play? Palaeogeography, Palaeoclimatology, Palaeoecology, 528. pp. 99-119. ISSN 0031-0182
Abstract
Oxygen restricted conditions were widespread in European shelf seas after the end-Triassic mass extinction event and they are reported to have hindered the recovery of marine benthos. Here we reconstruct the redox history of the Early Jurassic Blue Lias Formation of southwest Britain using pyrite framboid size analysis and compare this with the recovery of bivalves based on field and museum collections. Results suggest widespread dysoxia punctuated by periods of anoxia in the region, with the latter developing frequently in deeper water settings. Despite these harsh conditions, initial benthic recovery occurred rapidly in the British Jurassic, especially in shallowest settings, and shows no relationship with the intensity of dysoxia. A stable diversity was reached by the first recognised ammonite zone after the end-Triassic mass extinction. This contrasts with the deeper-water, more oxygen-poor sections where the diversity increase was still continuing in the earliest Sinemurian Stage, considerably longer than previously reported. Similar recovery rates are seen amongst other groups (brachiopods and ammonites). Oxygen-poor conditions have been suggested to delay recovery after the Permo-Triassic mass extinction, but this is not the case after the end-Triassic crisis. We suggest that this was because the European dysoxia was only a regional phenomenon and there were plenty of well-ventilated regions available to allow an untrammelled bounce back.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Elsevier B.V. This is an author produced version of a paper published in Paleogeography, Paleoclimatology, Paleoecology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Pyrite framboids; Early Jurassic; Blue Lias Formation; Benthic recovery; Diversification |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Jul 2019 11:01 |
Last Modified: | 10 May 2020 00:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.palaeo.2019.05.011 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:148131 |
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