Figure F49. Close-up photographs showing a serpentinized mylonite zone (negative and positive images). A porphyroclast and pressure shadow tail of recrystallized (now altered) clinopyroxene was used to determine a reverse sense of shear (Passchier and Simpson, 1986). The mylonite is also cut by postkinematic pyroxenite (Px) veins and serpentinite veins (S) indicating continued magmatic activity after cessation of crystal-plastic deformation, later followed by serpentine alteration. As discussed in the text, this sample also contains pyroxenite that was pre- or synkinematic (interval 209-1268A-14R-3, 19–31 cm).