Revised Wonoka isotopic anomaly in South Australia and Late Ediacaran mass extinction

Journal of the Geological Society
By: , and 



The global Late Ediacaran Shuram–Wonoka carbon isotope anomaly has been regarded as the largest and longest known isotopic anomaly in the ocean, assuming that all Ediacaran carbonate is marine. Disregarding carbonate in South Australia shown here to be palaeosol or palaeokarst, the synchronous marine organic–carbonate excursion is only −8‰ for δ13C organic and −6‰ for δ13C carbonate, and lasted less than a million years. This revised magnitude and duration is comparable with perturbations across the Permian–Triassic boundary, and correlative with a global Late Ediacaran acritarch mass extinction. Like Permian–Triassic isotopic excursions, the revised organic–carbonate Wonoka excursion may also have been a greenhouse palaeoclimatic warm spike, which terminated valley incision and glacioeustatic drawdown during the mid-Ediacaran Fauquier Glaciation, and preceded chill of the Late Ediacaran Billy Springs Glaciation.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Revised Wonoka isotopic anomaly in South Australia and Late Ediacaran mass extinction
Series title Journal of the Geological Society
DOI 10.1144/jgs2014-016
Volume 171
Issue 5
Year Published 2014
Language English
Publisher GeoScienceWorld
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description 14 p.
First page 709
Last page 722
Country Australia
Other Geospatial Flinders Ranges
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