Guilbaud, R, Slater, BJ, Poulton, SW orcid.org/0000-0001-7621-189X et al. (4 more authors) (2018) Oxygen minimum zones in the early Cambrian ocean. Geochemical Perspectives Letters, 6. pp. 33-38. ISSN 2410-339X
Abstract
The relationship between the evolution of early animal communities and oceanic oxygen levels remains unclear. In particular, uncertainty persists in reconstructions of redox conditions during the pivotal early Cambrian (541-510 million years ago, Ma), where conflicting datasets from deeper marine settings suggest either ocean anoxia or fully oxygenated conditions. By coupling geochemical palaeoredox proxies with a record of organic-walled fossils from exceptionally well-defined successions of the early Cambrian Baltic Basin, we provide evidence for the early establishment of modern-type oxygen minimum zones (OMZs). Both inner- and outer-shelf environments were pervasively oxygenated, whereas mid-depth settings were characterised by spatially oscillating anoxia. As such, conflicting redox signatures recovered from individual sites most likely derive from sampling bias, whereby anoxic conditions represent mid-shelf environments with higher productivity. This picture of a spatially restricted anoxic wedge contrasts with prevailing models of globally stratified oceans, offering a more nuanced and realistic account of the Proterozoic-Phanerozoic ocean transition.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2018 The Authors. This work is distributed under the Creative Commons Attribution 4.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. A copy of the licence can be found at https://creativecommons.org/licences/by/4.0. Additional information is available at http://www.geochemicalperspectivesletters.org/copyrightand-permissions. |
Dates: |
|
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) |
Funding Information: | Funder Grant number Royal Society WM150108 |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Feb 2018 12:45 |
Last Modified: | 25 Jun 2023 21:14 |
Status: | Published |
Publisher: | European Association of Geochemistry |
Identification Number: | 10.7185/geochemlet.1806 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:127305 |