Ocean oxygenation in the wake of the Marinoan glaciation

@article{Sahoo2012OceanOI,
  title={Ocean oxygenation in the wake of the Marinoan glaciation},
  author={Swapan K. Sahoo and Noah J. Planavsky and Brian Kendall and Xinqiang Wang and Xiaoying Shi and Clint Scott and Ariel D. Anbar and Timothy W. Lyons and Ganqing Jiang},
  journal={Nature},
  year={2012},
  volume={489},
  pages={546-549}
}
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… 
Oceanic oxygenation events in the anoxic Ediacaran ocean.
TLDR
A multi-proxy paleoredox study of a relatively continuous, deep-water section in South China that was paleogeographically connected with the open ocean provides evidence for multiple oceanic oxygenation events (OOEs) in a predominantly anoxic global Ediacaran-early Cambrian ocean.
Coupling of ocean redox and animal evolution during the Ediacaran-Cambrian transition
TLDR
A comprehensive N-isotope dataset from the Yangtze Basin is presented that reveals remarkable coupling between δ15N, δ13C, and evolutionary events from circa 551 to 515 Ma, and shows that increased nutrient nitrogen availability may have exerted an important control on both macroevolution and ocean oxygenation.
Ediacaran Marine Redox Heterogeneity and Early Animal Ecosystems
TLDR
This study provides direct—rather than inferred—evidence that anoxia played a role in shaping a landmark Ediacaran ecosystem, if the anoxic conditions characteristic of the studied sections were widespread in the late Neoproterozoic, environmental stress would have hindered the development of complex ecosystems.
Global marine redox evolution from the late Neoproterozoic to the early Paleozoic constrained by the integration of Mo and U isotope records
Abstract The emergence and diversification of early animals is commonly thought to have coincided with atmosphere and ocean oxygenation across the terminal Neoproterozoic and early Paleozoic, during
Enhanced chemical weathering triggered an expansion of euxinic seawater in the aftermath of the Sturtian glaciation
Abstract The Cryogenian Period comprised two episodes of global glaciation (Sturtian and Marinoan glaciations) separated by a non-glacial interval, which was characterized by early radiations of
Mo isotopic response to the end of Neoproterozoic Marinoan glaciation: Evidence from a sedimentary profile in South China
Abstract In the geological time, atmosphere and ocean have experienced two important oxidation events which are the Paleoproterozoic Great Oxidation Event and the Neoproterozoic Oxidation Event.
Transient marine euxinia at the end of the terminal Cryogenian glaciation
TLDR
An integrated analysis demonstrates that the ocean experienced transient but widespread euxinia following this Snowball Earth event, which marks one of the most drastic transitions in Earth history.
A tectonically driven Ediacaran oxygenation event
TLDR
A biogeochemical model is used which links tectonic CO2 degassing rates to carbon and sulphur burial, and suggests that atmospheric pO2 increased by ~50% during the Ediacaran Period.
Oceanic molybdenum drawdown by epeiric sea expansion in the Mesoproterozoic
Abstract Molybdenum is a bioessential micronutrient whose abundance in the global oceans may have played a primary role in evolution of the Earth's nitrogen cycle and, ultimately, in the timing of
Oxygenation of Ediacaran Ocean recorded by iron isotopes
Abstract The increase in atmospheric oxygen during the late Neoproterozoic Era (ca. 800–542 Ma) may have stimulated the oxygenation of the deep oceans and the evolution of macroscopic multicellular
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 125 REFERENCES
A Stratified Redox Model for the Ediacaran Ocean
TLDR
A detailed spatial and temporal record of Ediacaran ocean chemistry for the Doushantuo Formation in the Nanhua Basin, South China is presented, finding evidence for a metastable zone of euxinic (anoxic and sulfidic) waters impinging on the continental shelf and sandwiched within ferruginous [Fe(II)-enriched] deep waters.
Oxidation of the Ediacaran Ocean
TLDR
High-resolution carbon isotope and sulphur isotope records from the Huqf Supergroup, Sultanate of Oman, that cover most of the Ediacaran period indicate that the ocean became increasingly oxygenated after the end of the Marinoan glaciation and allow us to identify three distinct stages of oxidation.
Tracing the stepwise oxygenation of the Proterozoic ocean
TLDR
A new perspective on ocean oxygenation is presented based on the authigenic accumulation of the redox-sensitive transition element molybdenum in sulphidic black shales, which reflects a greatly expanded oceanic reservoir due to oxygenation of the deep ocean and corresponding decrease in sulphide conditions in the sediments and water column.
Fossil steroids record the appearance of Demospongiae during the Cryogenian period
TLDR
It is suggested that shallow shelf waters in some late Cryogenian ocean basins contained dissolved oxygen in concentrations sufficient to support basal metazoan life at least 100 Myr before the rapid diversification of bilaterians during the Cambrian explosion.
The Neoproterozoic oxygenation event: Environmental perturbations and biogeochemical cycling
Abstract The oxygen content of the Earth's surface environment is thought to have increased in two broad steps: the Great Oxygenation Event (GOE) around the Archean–Proterozoic boundary and the
Pulsed oxidation and biological evolution in the Ediacaran Doushantuo Formation
TLDR
High-resolution geochemical data from the fossil-rich Doushantuo Formation in South China are reported that confirm trends from other broadly equivalent sections and highlight key features that have not been observed in most sections or have received little attention.
Late-Neoproterozoic Deep-Ocean Oxygenation and the Rise of Animal Life
TLDR
The iron content of deep-sea sediments shows that the deep ocean was anoxic and ferruginous before and during the Gaskiers glaciation 580 million years ago and that it became oxic afterward.
The transition to a sulphidic ocean ∼ 1.84 billion years ago
The Proterozoic aeon (2.5 to 0.54 billion years (Gyr) ago) marks the time between the largely anoxic world of the Archean (> 2.5 Gyr ago) and the dominantly oxic world of the Phanerozoic (< 0.54 Gyr
Stable isotopic evidence for methane seeps in Neoproterozoic postglacial cap carbonates
TLDR
Carbon isotopic and petrographic data from a Neoproterozoic postglacial cap carbonate in south China are reported that provide direct evidence for methane-influenced processes during deglaciation, lending strong support to the hypothesis that methane hydrate destabilization contributed to the enigmatic cap carbonates deposition and strongly negative carbon isotopic anomalies following Neopropriaterozoic ice ages.
Evidence for a redox stratified Cryogenian marine basin, Datangpo Formation, South China
Abstract Here, in an effort to explore Cryogenian seawater chemistry, we present chemostratigraphic results for iron, carbon, molybdenum, and sulfur for two outcrop sections for the ca. 663–654 Ma
...
1
2
3
4
5
...