Map of the central and southern portion of SFB (Minas Gerais State, Brazil), representing the area of interest of this work. The basement structural map was based on time-migrated seismic reflection surveys (TWT). Wells with H₂, SCDs and confirmed emissions of H₂ by Moretti et al. (2021a) and Geymond et al. (2022) are plotted over the basement structural map. Faults and lineaments from Geological Map scale 1:1,000,000 of Geological Survey of Brazil. SDT Fault = São Domingos Thrust Fault, BT Fault = Borrachudo Thrust Fault, JPT Fault = João Pinheiro Thrust Fault after Reis and Alkmim (2015).