Figure F203. Contact between altered basalt of Unit 1256D-80a and medium-grained gabbro of Unit 1256D-81 (Thin Section 59; Sample 312-1256D-213R-1 [Piece 13A, 51–54 cm]) (field of view = 30.0 mm). Contact marks the boundary between the sheeted dike complex and the plutonic section. Note the decrease in grain size of the gabbro.
Previous | Close | Next | Top of page