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Table 1

H2 generating rocks (H2_GR) and their related minerals of interest for H2 generation.

Geological context Oceanic rocks Continental rocks
H2_GR type H2_GR1: Oceanic lithosphere, Ophiolites H2_GR2: Iron-bearing rocks (BIF, greenstone belts) H2_GR3: Granitic and sedimentary rocks H2_GR4: Organic-rich rocks (shale, coal)
Process Redox reactions Redox reactions Radiolysis Late maturation
Minerals of interest Olivine, Pyroxene, Amphibole, Chlorite, Serpentine, Magnetite, Pyrrhotite Olivine, Pyroxene, Amphibole, Chlorite, Serpentine, Magnetite, Garnet, Siderite, Pyrrhotite U-minerals, Micas, K-feldspars, Clay minerals Organic matter (kerogens)

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