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Figure F306. Veins in sheeted dikes. A. Wide vein and thinner veins disposed in a network (interval 312-1256D-180R-1, 0–7 cm). B. Thin vein surrounded by a wide halo (Thin Section 19; Sample 312-1256D-180R-1, 0–4 cm) (cross-polarized light; field of view [FOV] = 2.25 mm). C. Quartz-chlorite vein (Thin Section 20; Sample 312-1256D-181R-1, 27–30 cm). D. Quartz-chlorite vein in C (cross-polarized light; FOV = 2.25 mm). E. Sulfide-bearing veins with dark halos (interval 312-1256D-173R-1, 107–116 cm). F. Quartz-chlorite-sulfide vein exhibiting zonation and slight track of opening (Thin Section 11; Sample 312-1256D-176R-1, 92–94 cm) (cross-polarized light; FOV = 2.25 mm).

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