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Oxygen minimum zones in the early Cambrian ocean

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Nettersheim,  Benjamin J.
Research Group Organic Paleo-Biogeochemistry, Dr. C. Hallmann, Max Planck Institute for Biogeochemistry, Max Planck Society;

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引用

Guilbaud, R., Slater, B. J., Poulton, S. W., Harvey, T. H. P., Brocks, J. J., Nettersheim, B. J., & Butterfield, N. J. (2018). Oxygen minimum zones in the early Cambrian ocean. Geochemical Perspectives Letters, 6, 33-38. doi:10.7185/geochemlet.1806.


引用: https://hdl.handle.net/21.11116/0000-0000-BAF5-A
要旨
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 innerand 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.