Fig. 3From: New temperature and oxygen fugacity data of Martian nakhlite from Northwest Africa (NWA) 5790 and implications for shallow sulphur degassingTotal sulphur content vs. fO2 (expressed as ΔQFM) degassing simulations at 0.04–5 bar. Degassing models calculated with D-Compress are shown for an open C–S–O–H system. For close-system degassing curves, see Additional file 1: Figure S4. At the pressure range below 1 bar (dashed-dotted line), the analytical continuation of the modelled curves was utilised to describe the relationship between pressure and fO2 based on the criterion R2 = 1. The burial depths are cited from [1] Mikouchi et al. (2006); [2] Mikouchi and Miyamoto (2002); [3] Mikouchi et al. (2012). The nakhlite excavation depth is cited from [4] Cohen et al. (2017). In this study, the light blue regions are estimated to be the burial depth range of NWA 998 and Lafayette (ca. 30–40 m) and Y-000593 and Nakhla (< 7 m)Back to article page