Figure 12From: Abiotic ammonium formation in the presence of Ni-Fe metals and alloys and its implications for the Hadean nitrogen cycleEstimated increase in NH4+ concentration of the Hadean Ocean (in μmol.L-1) from the hydrothermal N2 reduction reaction per 1 Ma as a function of N2-to-NH4+ conversion percentages, heat flow and percentage of heat released via hydrothermal systems (5, 20 and 80%).Back to article page