Cyanobacteria, they say, contributed to the Oxidation - but didn't trigger it. The former spread before the latter. Dilan M. Ratnayake, Ryoji Tanaka, Eizo Nakamura proposed (August) a model as to why: urea and nickel.
Urea has nitrogen and dissolves in low-pressure water, which nitrogen doesn't (N2 dissolves in high pressure, hence the Bends). But urea seems to get too high a concentration with nickel about. Also not good for plants. I guess?
Anyway eventually the nickel dropped off and the urea got to a decent level, allowing the cyanobacteria to bloom. Oxygen ran riot, the temperature plummeted, on with Huronian.
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