Page 102 - Microtectonics

90 4 · Foliations, Lineations and Lattice Preferred Orientation

Fig. 4.25. Low-grade metaconglomerate with highly elongated, mainly monocrystalline quartz pebbles. Undulose extinction of quartz indi-
cates that crystalplastic deformation was important. Some pebbles are more deformed than others, probably due to favourable lattice pre-
ferred orientation for easy flattening (cf. Fig. 4.24b). Western Alps. Width of view 13 mm. Polars at 45°. (Sample courtesy Gordon Lister)

Fig. 4.26. Elongate subgrains in a deformed quartz crystal. Note formation of new, elongate grains in lower right and upper left corners.
St. Barthélemy, Pyrenees, France. Width of view 1.8 mm. CPL