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- W1979831773 abstract "The Limpopo Belt in Southern Africa has been used to demonstrate that modern-style continent-continent collision operated during the Late Archaean (2.6–2.7 Ga). We have studied the age and PT conditions of strike-slip tectonism along the important right-lateral Triangle Shearzone. Our results substantiate existing Proterozoic metamorphic mineral age data of prior uncertain significance. Using the PbPb and SmNd garnet chronometers and the ArAr step heating technique for amphibole, we have dated pre- and syn-tectonic metamorphic minerals at 2.2 and 2.0 Ga. Thus the Triangle Shearzone can now be regarded as an important Proterozoic suture. Examination of corresponding high-grade PT conditions, reaching ∼ 800°C at 9 kbar, indicates a clockwise metamorphic evolution with pronounced isothermal uplift. Although the evidence that thrusting of the Marginal Zones of the Limpopo Belt over the adjoining cratons occurred during the Late Archaean clearly remains, it is now very uncertain to which event the various PT paths obtained in the Limpopo Belt may be assigned. Therefore the question of whether the 2.6–2.7 Ga tectonism fits on its own a modern-style continental collision model remains open and has to be reassessed." @default.
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- W1979831773 date "1995-01-01" @default.
- W1979831773 modified "2023-09-27" @default.
- W1979831773 title "The Triangle Shearzone, Zimbabwe, revisited: new data document an important event at 2.0 Ga in the Limpopo Belt" @default.
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- W1979831773 doi "https://doi.org/10.1016/0301-9268(94)00039-t" @default.
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