For most people working in Archaean and Proterozoic terrains, polyphase deformation and metamorphism is an accepted difficulty when attempting to understand the evolution of any basement region. Reworking of large blocks of crust is accomplished during these events and so has an important place in the eventual stabilization of continental areas. This type of large-scale reworking is a common phenomenon in all younger orogenic belts where segments of earlier crust became incorporated. In this volume, reactivation is distinguished from reworking by being defined as the rejuvenation of discrete structures, for example faults and shears zones. Reactivation often produces a major...

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