Additional file 1 of New temperature and oxygen fugacity data of Martian nakhlite from Northwest Africa (NWA) 5790 and implications for shallow sulphur degassing

Additional file 1: Figure S1. Equilibrium test plot (Bacon and Hirschmann 1988) for ilmenite–titanomagnetite pairs reported in Table 4 of Szymanski et al. (2010) (blue dots) and lamellae ilmenites in this study (red dots). Error bars of data points are typical EPMA analytical uncertainty according to the compilation of Bacon and Hirschmann (1988). Table S1. Equilibrium test data. Figure S2. Contrast-enhanced BSE image of NWA 5790 thin-section. The diameter of the rounded mount is 1 cm. Figure S3. (a) Closure temperature and fO2 (relative to QFM buffer) for NWA 5790 nakhlite titanomagnetite–ilmenite pairs in this study (red dots), compared to closure temperature and fO2 from titanomagnetite–ilmenite pairs in nakhlites from the literature (Boctor et al. 1976; Bunch and Reid 1975; Sautter et al. 2002; Szymanski et al. 2010; Treiman and Irving 2008). All closure temperatures and fO2 were recalculated using geothermometer and oxybarometer in Sauerzapf et al. (2008). Error bars for temperature and fO2 are ± 70 °C and ± 0.5log fO2 unit, respectively. (b) Total sulphur content vs. fO2 (expressed as ΔQFM) degassing simulations. (c) Pressure vs. fO2 (expressed as ΔQFM) degassing simulations. Degassing models calculated by D-Compress are in close C–S–O–H system. Figure S4. Total sulphur content vs. fO2 (expressed as ΔQFM) degassing simulations at 0.04–5 bar. Degassing models calculated with D-Compress are shown for a close C–S–O–H system. At the pressure range below 1 bar, 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).