Abstract
The slip behaviour of quartz from a granite and granitic veins during subsolidus high temperature conditions (700°–800°C) of deformation is studied by lattice preferred orientation (LPO) and microstructural techniques. LPOs with a point maximum of [ C] axes parallel to the shear direction, which is close to the stretching lineation, are presented and interpreted with the aid of light and electron microscopy in terms of [ C] as the dominant slip direction during plastic deformation. Microscopy of such samples reveals the presence of (0001) tilt boundaries and free [0001] Burgers vector dislocations in edge orientations. A change in LPO in a decreasing temperature environment from [ C] axes parallel to the shear direction to [ C] axes normal to the shear direction documents a fabric transition from the rare [ C] slip to the more common < a> slip fabric. It is concluded that conditions of high temperature and partial pressure of water are required to initiate dominant [ C] slip during deformation at geological strain rates.
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