Page 188 - Microtectonics

6.3 · Fringe Structures 177

Fig. 6.20b. Detail of a fringe adjacent to another spherical pyrite framboid in the same outcrop. Most fibres are parallel and seem to be
displacement controlled, but some small fibres radiate out from the central sphere and are face-controlled. Dextral shear sense. Yilgarn
Craton, Western Australia. Width of view 12 mm. CPL (Photographs courtesy Dirk Wiersma)

Fig. 6.21. Quartz and calcite fibres in strain fringes around pyrite grains in carbonaceous slate. The object at left is shown enlarged in
Fig. 6.27. Lourdes, Pyrenees, France. Sense of shear dextral. Width of view 20 mm. CPL. (Sample courtesy Henk Zwart)