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- W4319656820 endingPage "420" @default.
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- W4319656820 abstract "Abstract The Neoproterozoic carbonate record contains multiple carbon isotope anomalies, which are the subject of intense debate. The largest of these anomalies, the Shuram excursion (SE), occurred in the mid‐Ediacaran (~574–567 Ma). Accurately reconstructing marine redox landscape is a clear path toward making sense of the mechanism that drives this δ 13 C anomaly. Here, we report new uranium isotopic data from the shallow‐marine carbonates of the Wonoka Formation, Flinders Ranges, South Australia, where the SE is well preserved. Our data indicate that the δ 238 U trend during the SE is highly reproducible across globally disparate sections from different depositional settings. Previously, it was proposed that the positive shift of δ 238 U values during the SE suggests an extensive, near‐modern level of marine oxygenation. However, recent publications suggest that the fractionation of uranium isotopes in ferruginous and anoxic conditions is comparable, opening up the possibility of non‐unique interpretations of the carbonate uranium isotopic record. Here, we build on this idea by investigating the SE in conjunction with additional geochemical proxies. Using a revised uranium isotope mass balance model and an inverse stochastic carbon cycle model, we reevaluate models for δ 13 C and δ 238 U trends during the SE. We suggest that global seawater δ 238 U values during the SE could be explained by an expansion of ferruginous conditions and do not require a near‐modern level of oxygenation during the mid‐Ediacaran." @default.
- W4319656820 created "2023-02-10" @default.
- W4319656820 creator A5011535076 @default.
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- W4319656820 creator A5051417333 @default.
- W4319656820 creator A5055654190 @default.
- W4319656820 creator A5062234274 @default.
- W4319656820 date "2023-02-08" @default.
- W4319656820 modified "2023-10-12" @default.
- W4319656820 title "Revisiting marine redox conditions during the Ediacaran Shuram carbon isotope excursion" @default.
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