Page 203 - Microtectonics

7.3 · Inclusions 193

Fig. 7.5. a Micaschist with porphyroblasts of staurolite, biotite and andalusite. The large twinned crystal in the centre is staurolite with an
inclusion pattern mimicking differentiated crenulation cleavage; a detail of the right-hand rim is shown in b. The light-coloured sub-
horizontal bands in the crystal are inclusion-poor zones representing the differentiated mica-rich limbs of microfolds (cf. Fig. 4.13). The
dominant foliation in the matrix is a fine-grained schistosity, strongly deflected around the staurolite porphyroblasts. This shows that
since porphyroblast growth, crenulation cleavage in the matrix has been destroyed by a process as visualised in Figs. 7.4 and 4.18.
(Example of syntectonic porphyroblasts: F1 in Fig. 7.9). Rioumajou, Pyrenees, France. Width of view a 10 mm. Polars at 45°; b 2 mm. PPL