Chen, Z-Q, Fang, Y, Wignall, PB orcid.org/0000-0003-0074-9129 et al. (6 more authors) (2022) Microbial Blooms Triggered Pyrite Framboid Enrichment and Oxygen Depletion in Carbonate Platforms Immediately After the Latest Permian Extinction. Geophysical Research Letters, 49 (7). e2021GL096998. ISSN 0094-8276
Abstract
Redox variations across the Permian-Triassic boundary (PTB) have long been debated, especially during the proliferation of PTB microbialites. Here, we report redox fluctuations across the PTB to evaluate links between the two based on pyrite framboid analysis from basin to platform settings in South China. During the end-Permian extinction, abundant framboids indicate a widespread anoxia that was likely a direct cause of extinction. In the earliest Triassic (Hindeodus parvus conodont zone), pyrite framboids were absent in ramp to basin and shallow, nonmicrobialite platform sections. In contrast, the coeval microbialites yield abundant framboids indicative of dysoxia. The fact that framboids were only confined to PTB microbialites and absent in other habitats indicates that microbe bloom may have stimulated dysoxic watermass and triggered the framboid growth within microbe aggregates. Thus, microbialites were not built in reducing settings, but instead, microbial proliferation caused local, dysoxia within shallow oxygenated platforms after the extinction.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022. American Geophysical Union. All Rights Reserved. This is the final version of the following article: Chen, Z.-Q., Fang, Y., Wignall, P. B., Guo, Z., Wu, S., Liu, Z., et al. (2022). Microbial blooms triggered pyrite framboid enrichment and oxygen depletion in carbonate platforms immediately after the latest Permian extinction. Geophysical Research Letters, 49, e2021GL096998, which has been published in final form at https://doi.org/10.1029/2021GL096998. An edited version of this paper was published by AGU. Copyright 2022 American Geophysical Union. |
Keywords: | end-Permian extinction; microbial bloom; shallow platform; redox variation; pyrite framboids; microbialite buildup |
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) > Earth Surface Science Institute (ESSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 May 2022 09:32 |
Last Modified: | 06 May 2022 00:38 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1029/2021GL096998 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:186479 |