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These two photomicrographs (same view in both) show deformation and recrystallization fabrics in a thin section of phase I granite from the study area. The large microcline megacryst in the lower part of the photomicrographs shows development of a core and mantle structure and the beginning of recrystallized tails. Note the elongate quartz grains with discontinuous undulatory extinction and subgrains in the upper part of the lower photomicrograph.
Left in plane-polarized light and right in cross-polarized light.
Width = 13 mm. (both)
Minerals present: Quartz, plagioclase, microcline, biotite, others too small to see.
Rock type: Granite, Town Mtn. porphyritic
General Location: Wolf Mountain Intrusion, Wolf Mtn. Ranch, central Llano Uplift.
