Figure F228. A. Relict primary hornblende within aggregates of fibrous actinolite replacing magmatic hornblende in a microcrystalline trondhjemite dike (Thin Section 57; Sample 312-1256D-212R-1, 24–27 cm) (field of view [FOV] = 0.6 mm; plane-polarized light). B. Same as A; cross-polarized light. C. Intrusive contact of trondhjemite (Unit 1256D-80b) into basalt of Unit 1256D-80a (Thin Section 57; Sample 312-1256D-212R-1, 24–27 cm) (FOV = 0.6 mm; plane-polarized light). Note the large subhedral oxide grain (lower right) and relict magmatic hornblende (right of center).
Previous | Close | Next | Top of page