Figure F297. Alteration and magmatic patches in gabbros. A. Leucocratic patches in gabbro (interval 312-1256D-214R-2, 60–70 cm). B. Magmatic patch in gabbro (Thin Section 64; Sample 312-1256D-214R-2, 50–51 cm) (cross-polarized light; FOV = 4.5mm). Note the relatively less altered large plagioclase crystals. C. Leucocratic mineral patch in gabbro (Thin Section 83; Sample 312-1256D-220R-1, 24–29 cm) (plane-polarized light). Note the large plagioclase crystals. (Continued on next page.)
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