Page 87 - Microtectonics

4.2 · Foliations 75

Fig. 4.9. Continuous foliation (schistosity) in an upper-amphibolite facies micaceous quartzite, mainly defined by subparallel micas. Note
the irregular shape of quartz crystals as a result of secondary grain growth (Sect. 3.12.2). Undulose extinction and subgrains are probably
due to late deformation after grain growth. Ribeira Belt, Rio de Janeiro State, Brazil. Width of view 18 mm. CPL

Fig. 4.10. Continuous cleavage on thin section scale (slaty cleavage) in a slate, defined by fine-grained micaceous material. Fabrics like this
may be spaced foliations that contain domains without fabric elements or with folded older fabric elements when studied by SEM (Fig. 10.4)
or TEM. Castellbo, Pyrenees, Spain. Width of view 1.8 mm. PPL