Nitrogen solubility in basaltic silicate melt - Implications for degassing processes

Abstract The distribution of nitrogen between the different terrestrial reservoirs (core-mantle-atmosphere) and how this may have changed since earliest planetary stages is uncertain. In particular, primordial degassing processes magma ocean its role in formation atmosphere remains to be quantified. Since no geological samples can capture early process, we need go through thermodynamic modeling solubility silicate melt. We hence performed experiments on basaltic at fluid saturation C-H-O-N system, using an Internally Heated Pressure Vessel (IHPV) Piston Cylinder (PC) pressure range 0.8 kbar 10 kbar, temperature 1200 1300 °C, a wide fO2 conditions from IW + 4.9 IW-4.7 (IW standing for Iron-Wustite redox buffer). concentration quenched melts was analysed by secondary ion mass spectrometry (SIMS), speciation dissolved C-O-H species determined Fourier transform infrared spectroscopy (FTIR). identified two melt: N2 dominating fO2 > IW N3? lower fO2. Using these data database constraining 1 bar 10 kbar pressure, calibrated law basalts defining P-T-fO2 dependences. This model expands Libourel et al. (2003) high higher activities. It used investigate relevant accretion modern volcanism.