Denitrification: What's biology got to do with it?

Canonical denitrification mediated by microbes is a stepwise reduction of nitrate (NO₃^-) to dinitrogen (N₂) while anammox and codenitrification produce hybrid N₂ by utilizing nitrite (NO₂^-) and another N source such as ammonium (NH₄⁺) or organic N. Both anammox and codenitrification have been shown to be important N removal processes in terrestrial and aquatic environments. But what if hybrid N₂ is formed abiotically? How does this new process, chemocodenitrification, stack up to biological sources? Where might this process be environmentally relevant?