[marcosdumay]

I don't think anybody knows enough to tell you what kinds of reactions happen on planet-wide environments without an oxidizing atmosphere.

[kjkjadksj]

Chemist certainly do. Reactions are carried out at specific atmospheric conditions. E.g. oxygen may well be purged.

[marcosdumay]

Chemists do controlled reactions in controlled environments. It's a completely different thing from knowing what happens somewhere in a planet.