Abstract
The Prieska area of the Cape Province of South Africa lies across the junction between two major Proterozoic low-angle shear/thrust zones. The first zone marks the margin to the Kheis mobile belt and carried Proterozoic schists and quartzitic sediments (the Matsap), together with Archaean basement, to the SE over a foreland of Proterozoic Transvaal sediments. The second, re-thrust the Matsap rocks to the NE, but also covered them with high-grade metamorphic rocks of the Namaqua belt. Later dextral strike-slip shear zone movements and large back-folds have enabled the SE-verging thrust zones to be traced well over 100 km on to the foreland, thus giving a minimum estimate of displacement. Both sets of shears are considered to represent A-type subduction zones some considerable distance from any oceanic suture.
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