This technical contribution demonstrates the link between percolation of silicates and the onset of an anoxic ocean, highlighting key geological processes.
Key Points
The aim is to connect silicate assembly processes in Earth's early formation to the emergence of an anoxic iron-silicate regime.
Experimental data on percolation and dihedral angles under varied pressure conditions were analyzed.
A four-stage iterative accretion model was developed to recover primitive upper mantle compositions.
Thermodynamic constraints on melt fraction and porosity for grain connectivity were quantified.
Percolative connectivity is favored at pressures of ≤1.0–1.5 GPa, enabling early core formation.
Increased mantle oxygen fugacity was observed from ΔIW ≈ –4 to late-stage values ΔIW ≈ –2 to –1.5.
Residual melts create an anoxic secondary atmosphere, influencing early planetary conditions.