Characterization of the structural and petrological evolution of plate-boundary fault zones (sensu lato, including both upper crustal faults and their underlying shear zones) is central to modelling the occurrence (or absence) of plate tectonics. Observations of both active and ancient fault zones are typically interpreted in the context of the Sibson-Scholz model of fault-zone structure (Scholz, 1988;Sibson, 1977Sibson, , 1983. In this model, increases in pressure and temperature with depth induce a transition from dominantly pressuresensitive frictional failure in the upper crust to dominantly
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