Science Advances

Supplementary Materials

This PDF file includes:

  • Volcanostratigraphic framework of the HC and KC and associated cherts
  • Hydrothermal field and associated chert and volcanic eruption sequences
  • Temperatures of hydrothermal fluids
  • Fig. S1. Sample locations for the different sections of the HC.
  • Fig. S2. Sample locations for the different sections of the KC.
  • Fig. S3. Sample location for the Etimambeni section of the NC.
  • Fig. S4. Field relationships of silicification processes in pillow lavas and cherts.
  • Fig. S5. Sketch map, location of analyzed samples, and pictures of the most typical lithologies of the pipes of the hydrothermal field of chert horizon CH2.
  • Fig. S6. Summary of the oxygen isotope values (δ18O; ‰) of mafic rocks and cherts of the OS.
  • Fig. S7. Summary of the oxygen isotope values (δ18O; ‰) of mafic rocks of the upper parts of the OS.
  • Fig. S8. Harker diagrams showing the relationships of SiO2 and other major and trace elements.
  • Fig. S9. Mid-ocean ridge basalt–normalized multielement diagrams of various lithologies within and adjacent to the hydrothermal field.
  • Fig. S10. Relationship between SiO2 and δ18O and estimated hydrothermal alteration temperatures for the mafic lavas of the HC.
  • Fig. S11. Relationship between SiO2 and δ18O and estimated hydrothermal alteration temperatures for the mafic lavas of the KC and the MC.
  • Table S1. Geochemical data (δ18O and SiO2) of metabasalts and cherts from the HC, NC, and KC of the OS.
  • Table S2. Mineralogical and geochemical data from the hydrothermal field site of chert horizon HC2.
  • References (61–69)

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