Revised Wonoka isotopic anomaly in South Australia and Late Ediacaran mass extinction
Gregory J. Retallack
André Marconato
Jeffery T. Osterhout
Kathryn E. Watts
Ilya N. Bindeman
10.6084/m9.figshare.3453746.v1
https://geolsoc.figshare.com/articles/journal_contribution/Revised_Wonoka_isotopic_anomaly_in_South_Australia_and_Late_Ediacaran_mass_extinction/3453746
<p>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 δ<sup>13</sup>C organic and −6‰ for δ<sup>13</sup>C 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.
</p>
2016-06-21 11:39:12
Ediacaran mass extinction
Permian
Ediacaran acritarch mass extinction
anomaly
Wonoka
δ 13 C carbonate
δ 13 C
marine
South Australia
Ediacaran Billy Springs Glaciation
excursion
Geology