Page 193 - Microtectonics

182 6 · Dilatation Sites – Veins, Strain Shadows, Fringes and Boudins

Fig. 6.27. a Detail of Fig. 6.21 showing wn-type quartz-calcite-chlorite fringes around a pyrite grain in carbonaceous slate; b shows a detail
of a. The assemblage resembles a face-controlled fringe with a suture formed in simple shear progressive deformation as shown in Fig. 6.24
but is slightly different, probably because this pyrite is elongate rather than square; the fibres have a sharp bend instead of a suture and may
actually be displacement-controlled. Further explanation in text. Lourdes, Pyrenees, France. Width of view a 7 mm; b 2.5 mm. CPL