Figure F9. Schematic diagram summarizing observations on many samples from Holes 1188A and 1188F, collectively indicating that anhydrite veins were emplaced after formation of the pale selvages. Whereas the selvages clearly developed from fluids transported via preexisting fractures, the anhydrite veins fill jogs and openings caused by reactivation of the fractures and a jumbling or rotation of wallrock blocks between them. The circled offset relationship would represent unequivocal evidence but has not been convincingly observed.

Figure F9. Schematic diagram summarizing observations on many samples from Holes 1188A and 1188F, collectively indicating that anhydrite veins were emplaced after formation of the pale selvages. Whereas the selvages clearly developed from fluids transported via preexisting fractures, the anhydrite veins fill jogs and openings caused by reactivation of the fractures and a jumbling or rotation of wallrock blocks between them. The circled offset relationship would represent unequivocal evidence but has not been convincingly observed.