Figure F264. Comparison of background alteration and alteration halos at different levels in the dike complex. A. Slightly altered, dark gray basalt (wet) (interval 312-1256D-174R-1, 10–14 cm). B. Composite halos parallel to quartz-pyrite veins, with a dark gray inner halo and light gray outer halo (wet) (interval 312-1256D-173R-1, 110–114 cm). C. Moderately altered dark greenish-gray basalt (wet) (interval 312-1256D-189R-1, 80–84 cm). D. Vein network with light gray to light green vein-parallel halos (wet) (interval 312-1256D-184R-1, 85–104 cm). E. Moderately to highly altered, dark greenish-gray basalt (wet) (interval 312-1256D-202R-1, 1–5 cm). F. Composite halo parallel to vein with a dark bluish-gray inner halo and outer light gray halo (interval 312-1256D-202R-1, 11–15 cm). Scale is the same for all photographs.
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