This PDF file includes:

• table S1. Main regions with a high 3.9-μm band depth.
  
• table S2. Retrieved abundances in selected pixels showing the highest concentration of carbonates in the listed areas.
  
• fig. S1. Main regions with high 3.9-μm band depth.
  
• fig. S2. Retrieved abundances in selected pixels showing the highest concentration of carbonates.
  
• fig. S3. Band center and band depth maps in Ernutet and Ikapati craters.
  
• fig. S4. Spectral fits of carbonate rich area in crater 2.
  
• fig. S5. Spectral fits (red curve) of phyllosilicate-rich area (black curve).
  
• fig. S6. Spectral fits (red curve) of natrite-rich area in Oxo crater (black curve, the same spectrum as in Fig. 5).
  
• fig. S7. Spectra of the end members used in the spectral modeling.

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