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Ocean oxygenation in the wake of the Marinoan glaciation.
Nature. 2012 Sep 27; 489(7417):546-9.Nat

Abstract

Metazoans are likely to have their roots in the Cryogenian period, but there is a marked increase in the appearance of novel animal and algae fossils shortly after the termination of the late Cryogenian (Marinoan) glaciation about 635 million years ago. It has been suggested that an oxygenation event in the wake of the severe Marinoan glaciation was the driving factor behind this early diversification of metazoans and the shift in ecosystem complexity. But there is little evidence for an increase in oceanic or atmospheric oxygen following the Marinoan glaciation, or for a direct link between early animal evolution and redox conditions in general. Models linking trends in early biological evolution to shifts in Earth system processes thus remain controversial. Here we report geochemical data from early Ediacaran organic-rich black shales (∼635-630 million years old) of the basal Doushantuo Formation in South China. High enrichments of molybdenum and vanadium and low pyrite sulphur isotope values (Δ(34)S values ≥65 per mil) in these shales record expansion of the oceanic inventory of redox-sensitive metals and the growth of the marine sulphate reservoir in response to a widely oxygenated ocean. The data provide evidence for an early Ediacaran oxygenation event, which pre-dates the previous estimates for post-Marinoan oxygenation by more than 50 million years. Our findings seem to support a link between the most severe glaciations in Earth's history, the oxygenation of the Earth's surface environments, and the earliest diversification of animals.

Authors+Show Affiliations

Department of Geoscience, University of Nevada, Las Vegas, Nevada 89154, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Historical Article
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

23018964

Citation

Sahoo, Swapan K., et al. "Ocean Oxygenation in the Wake of the Marinoan Glaciation." Nature, vol. 489, no. 7417, 2012, pp. 546-9.
Sahoo SK, Planavsky NJ, Kendall B, et al. Ocean oxygenation in the wake of the Marinoan glaciation. Nature. 2012;489(7417):546-9.
Sahoo, S. K., Planavsky, N. J., Kendall, B., Wang, X., Shi, X., Scott, C., Anbar, A. D., Lyons, T. W., & Jiang, G. (2012). Ocean oxygenation in the wake of the Marinoan glaciation. Nature, 489(7417), 546-9. https://doi.org/10.1038/nature11445
Sahoo SK, et al. Ocean Oxygenation in the Wake of the Marinoan Glaciation. Nature. 2012 Sep 27;489(7417):546-9. PubMed PMID: 23018964.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ocean oxygenation in the wake of the Marinoan glaciation. AU - Sahoo,Swapan K, AU - Planavsky,Noah J, AU - Kendall,Brian, AU - Wang,Xinqiang, AU - Shi,Xiaoying, AU - Scott,Clint, AU - Anbar,Ariel D, AU - Lyons,Timothy W, AU - Jiang,Ganqing, PY - 2012/03/03/received PY - 2012/07/26/accepted PY - 2012/9/29/entrez PY - 2012/9/29/pubmed PY - 2012/11/13/medline SP - 546 EP - 9 JF - Nature JO - Nature VL - 489 IS - 7417 N2 - Metazoans are likely to have their roots in the Cryogenian period, but there is a marked increase in the appearance of novel animal and algae fossils shortly after the termination of the late Cryogenian (Marinoan) glaciation about 635 million years ago. It has been suggested that an oxygenation event in the wake of the severe Marinoan glaciation was the driving factor behind this early diversification of metazoans and the shift in ecosystem complexity. But there is little evidence for an increase in oceanic or atmospheric oxygen following the Marinoan glaciation, or for a direct link between early animal evolution and redox conditions in general. Models linking trends in early biological evolution to shifts in Earth system processes thus remain controversial. Here we report geochemical data from early Ediacaran organic-rich black shales (∼635-630 million years old) of the basal Doushantuo Formation in South China. High enrichments of molybdenum and vanadium and low pyrite sulphur isotope values (Δ(34)S values ≥65 per mil) in these shales record expansion of the oceanic inventory of redox-sensitive metals and the growth of the marine sulphate reservoir in response to a widely oxygenated ocean. The data provide evidence for an early Ediacaran oxygenation event, which pre-dates the previous estimates for post-Marinoan oxygenation by more than 50 million years. Our findings seem to support a link between the most severe glaciations in Earth's history, the oxygenation of the Earth's surface environments, and the earliest diversification of animals. SN - 1476-4687 UR - https://www.unboundmedicine.com/medline/citation/23018964/Ocean_oxygenation_in_the_wake_of_the_Marinoan_glaciation_ L2 - https://doi.org/10.1038/nature11445 DB - PRIME DP - Unbound Medicine ER -