Figure F175 (continued). F. Dark green vein associated with sheared fractures in gabbro (interval 305-U1309D-277R-3, 1–24 cm). Yellow box = location of G and H. G. Dark green sheared vein in gabbro (Sample 305-U1309D-277R-3, 2–4 cm) (plane-polarized light, FOV = 2 cm). Yellow box = location of I. H. Same as G; cross-polarized light. Yellow box = location of J. I. Plagioclase grains adjacent to the vein are fractured and contain altered mineral infilling (plane-polarized light, magnification = 2.5×). Within the vein, replacement minerals such as chlorite and tremolite/actinolite appear to be further deformed into finer grains by a small offset along the vein. J. Same as I; cross-polarized light.
Previous | Close | Next | Top of page