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• W4220845093 endingPage "106630" @default.
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• W4220845093 abstract "Oxygenation, a key control on marine life, has a long and varied history. This is well seen in the early Mesoproterozoic. During this critical period, midway between the Great Oxidation (GOE) and Neoproterozoic Oxidation (NOE) events, low marine levels of pulsed oxygenation - likely driven by fluctuations in cyanobacterial productivity - alternated with episodic anoxia. However, since baseline oxygen levels were low, deciphering the scale and variability of redox evolution during this prolonged interval is challenging. This in turn has made it difficult to confidently identify key underlying controls on redox evolution. Combining sedimentological and geochemical methods, we studied shallow ∼1.57 Ga shelf carbonates with contrasting depositional fabrics. Carbonate I/(Ca + Mg) data indicate that (i) carbonate mud precipitated in a weakly oxygenated water column, whereas (ii) seafloor crystal fans formed in more poorly oxygenated seawater, containing Fe2+ and Mn2+. We infer that in (i) weakly oxygenated (hypoxic-oxic) conditions reflect increased planktic cyanobacterial productivity that, in the absence of carbonate precipitation inhibitors (Fe2+ and Mn2+), promoted water column carbonate mud (‘whiting’) precipitation. At the same time, aerobic degradation of settling organic matter lowered seafloor CaCO3 saturation. In contrast, in (ii) more poorly oxygenated seawaters containing Fe2+ and Mn2+ inhibited calcite precipitation but permitted aragonite which formed seafloor crystal fans. Together, these contrasting precipitates indicate relatively rapid pulsed redox fluctuations. These were relatively subtle, but sufficient to result in contrasting carbonate sediments, readily recognizable in the field. We hypothesize that cyanobacterial productivity, possibly linked to the availability of nutrients such as phosphate, was a key influence on water column redox cyclicity during the Mesoproterozoic." @default.
• W4220845093 created "2022-04-03" @default.
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• W4220845093 date "2022-06-01" @default.
• W4220845093 modified "2023-10-17" @default.
• W4220845093 title "Early Mesoproterozoic Ca-carbonate precipitates record fluctuations in shallow marine oxygenation" @default.
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• W4220845093 doi "https://doi.org/10.1016/j.precamres.2022.106630" @default.
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