Garth Run high strain zone (mylonitic Blue Ridge granitoids)

The Garth Run high strain zone "is ~125 m thick and dips moderately to the east.  In the footwall to the west, the zone is bound by weakly deformed to massive ca. 1050 Ma charnokite and, in the hanging wall, to the east, by ca. 1180 Ma leucogranitic rocks.  Rocks exposed in the Garth Run high-strain zone are primarily porphyroclast-bearing protomylonites and mylonites... Coarse-grained leucogranite bodies display pince-and-swell structures, and are commonly isolated as lozenge-shaped boudins... The mineralogy and microstructures evidence in Garth Run mylonites are consistent with deformation at greenschist-facies temperatures of ~400 degrees C (with a cooling age of about 333 Ma)."   Stop 1-4 Whitmeyer et al.