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The rise of oxygen in Earth’s early ocean and atmosphere
The initial increase of O2 in the atmosphere, its delayed build-up in the ocean, its increase to near-modern levels in the sea and air two billion years later, and its cause-and-effect relationship with life are among the most compelling stories in Earth’s history.
Iron Formation: The Sedimentary Product of a Complex Interplay among Mantle, Tectonic, Oceanic, and Biospheric Processes
Iron formations are economically important sedimentary rocks that are most common in Precambrian sedimentary successions. Although many aspects of their origin remain unresolved, it is widely…
Low Mid-Proterozoic atmospheric oxygen levels and the delayed rise of animals
Evidence for inhibited oxidation of Cr at Earth’s surface in the mid-Proterozoic is found, suggesting that atmospheric O2 levels were at most 0.1% of present atmospheric levels.
Evidence for oxygenic photosynthesis half a billion years before the Great Oxidation Event
The early Earth was characterized by the absence of oxygen in the ocean–atmosphere system, in contrast to the well-oxygenated conditions that prevail today. Atmospheric concentrations first rose to…
The ketone metabolite β-hydroxybutyrate blocks NLRP 3 inflammasome – mediated inflammatory disease
The findings suggest that the anti-inflammatory effects of caloric restriction or ketogenic diets may be linked to BHB-mediated inhibition of the NLRP3 inflammasome.
Widespread iron-rich conditions in the mid-Proterozoic ocean
Results indicate that ferruginous (anoxic and Fe2+-rich) conditions were both spatially and temporally extensive across diverse palaeogeographic settings in the mid-Proterozoic ocean, inviting new models for the temporal distribution of iron formations and the availability of bioessential trace elements during a critical window for eukaryotic evolution.
Rare Earth Element and yttrium compositions of Archean and Paleoproterozoic Fe formations revisited: New perspectives on the significance and mechanisms of deposition
Proterozoic ocean redox and biogeochemical stasis
- C. Reinhard, N. Planavsky, T. Lyons
- Geology, Environmental ScienceProceedings of the National Academy of Sciences
- 20 March 2013
This model suggests that the oceanic Mo reservoir is extremely sensitive to perturbations in the extent of sulfidic seafloor and that the record of Mo and chromium enrichments through time is consistent with the possibility of a Mo–N colimited marine biosphere during many periods of Earth’s history.
Large-scale fluctuations in Precambrian atmospheric and oceanic oxygen levels from the record of U in shales
Ocean oxygenation in the wake of the Marinoan glaciation
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, and 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.