Fig. 22

Outcrop photographs and photomicrographs of veins from the Yuli Belt. White arrow shows the coordinate direction for photomicrographs; plunge and trend indicate the view direction and pole to the plane of the thin-section photomicrographs. Schematic in bottom left of each photograph illustrates the interaction of S₄ (red) with previous foliations or other structures. a Late-stage veins dipping south and cross-cutting S₄. b Late-stage vein cross-cutting S₂ and S₄ characterized by slight ductile deformation along S₄ planes. c XPL image of a late-stage vein at a high angle to S₄, featuring elongate, optically continuous albite grains. d SEM-BSE image of the late-stage vein in c. The vein contains quartz, adularia, and ilmenite. e SEM-BSE image of a late-stage vein containing quartz, adularia, and ilmenite featuring elongate to blocky grain morphologies. f SEM-BSE false color image of D₂/D₄ fabric, D₄ microstructures defined by the retrograde paragenesis in Ti-oxide strain shadows and of a late-stage vein at a high angle to the fabric. The vein contains quartz and chlorite