Redox controls during magma ocean degassing

Nitrogen, carbon, hydrogen and sulfur are essential elements for life comprise about 1% of terrestrial planet masses. These dominate planetary surfaces due to their volatile nature, but the Earth's interior also constitutes a major C-H-N-S reservoir. Resolving origin surficial versus deep reservoirs requires past 4.5 Giga-years mantle outgassing ingassing processes be reconstructed, involving many unknowns. As an alternative, we propose define primordial distribution volatiles resulting from degassing magma ocean (MO). The equilibrium partitioning C-H-O-N-S between MO its atmosphere is calculated by means solubility laws, extrapolated high temperatures over large range redox conditions. Depending on conditions, amount volatiles, size considered, show that last episode may have degassed 40-220 bar atmospheres, whereas hundreds thousands ppm can retained in magma. Two contrasting scenarios investigated: reduced vs. oxidized MO. For cases (IW + 2) would dry C-N-S-rich. An intermediate state produces C-N atmosphere. In cases, present-day abundances (atmosphere crust) C N, most elements, very close - distribution. This probably lithospheric recycling post-magma only moderately alter these elements. Sulfur, contrast, must been mostly outgassed post-MO events. Changes during played first order role composition planets. We suggest more Venus H-loss growth this compared H-bearing one Earth. To verify assertions, constraints behavior extreme upon solidification urgently needed.