This paper reports the results of a series of experiments conducted on the Hospital Hill Quartzite in a solid-pressure medium, hot-creep apparatus. The quartzite is of interest in that it shows evidence of previous natural deformation and contains a high proportion of grains with subbasal deformation lamellae and undulose extinction. The experimental conditions were as follows: temperature, 700°C; confining pressure, 7 to 11 kb; and strain rate, 10−4 to 10−5 sec−1. These conditions span the brittle-ductile transition for the rock, and strains of as much as 17.5 percent were achieved. No new deformation lamellae formed during deformation; instead deformation was by cataclasis and shearing and the development of deformation bands parallel to the directions of maximum shear stress. These deformation bands appear to have formed from the original zones of undulose extinction and deformation lamellae.

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