Figure F171. A. Alteration front between a leucocratic zone and gabbro (interval 305-U1309D-99R-3, 10–25 cm). Yellow box = location of B and C. B. Gradient of the amount of alteration from the leucocratic zone into the gabbro (Sample 305-U1309D-99R-3, 13–16 cm) (plane-polarized light, field of view [FOV] = 2 cm). C. Same as B; cross-polarized light. Yellow box = location of D. D. Varying degrees of alteration from the leucocratic zone to the plagioclase-rich gabbro (cross-polarized light; FOV = 11 mm). (Continued on next page.)
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