Shear zones bounding the central zone of the Limpopo Mobile Belt,southern Africa |
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| Institution: | 1. Department of Earth Sciences, University of Torino, Torino, Italy;2. CNR-IGG, Torino, Italy;3. Department of Earth and Environmental Sciences, University of Iowa, Iowa City, IA 52242, USA;4. Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA |
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| Abstract: | Contrary to previously suggested north-directed thrust emplacement of the central zone of the Limpopo mobile belt, we present evidence indicating west-directed emplacement. The central zone differs from the marginal zones in rock types, structural style and isotopic signature and is an allochthonous thrust sheet. It is bounded in the north by the dextral Tuli-Sabi shear zone and in the south by the sinistral Palala shear zone which are crustal-scale lateral ramps. Published gravity data suggest that the lateral ramps are linked at depth and they probably link at the surface, in a convex westward frontal ramp, in the vicinity of longitude 26°30′E in eastern Botswana. Two phases of movement, the first between 2.7 and 2.6 Ga and the second between 2.0 and 1.8 Ga. occurred on both the Tuli-Sabi and the Palala shear zones. |
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