Previous   |    Close   |    Next

Figure F246. Growth of orthopyroxene near gabbro–basalt contacts in Gabbro 2. A. Sample from close to the intrusive contact of gabbroic Unit 1256D-93 into basaltic Unit 1256D-94 (Thin Section 116; Sample 312-1256D-232R-2, 98–100 cm) (field of view [FOV] = 40.0 mm; plane-polarized light). Note the pale pink color caused by the development of relatively coarse orthopyroxene along the margin of the intruding gabbro. The fine-grained metabasalt from Unit 1256D-94 also appears pinkish because of abundant orthopyroxene. B. Pinkish orthopyroxene (opx; larger colored grains near center) coexisting with clinopyroxene (cpx; filled with very small oxide grains), dusty plagioclase, and Fe-Ti oxide (Thin Section 120; Sample 312-1256D-233R-1, 13–14 cm) (FOV = 1.2 mm; plane-polarized light). The dustiness is caused by tiny dark inclusions.

Previous   |    Close   |    Next   |    Top of page