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Journal of the Geological Society

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Structural histories in the SW Southern Uplands, Scotland

¹ Department of Earth Sciences, The University, Leeds, UK
² Department of Geology, Imperial College, London, UK
³ Department of Geology, Goldsmiths College, London, UK

The detailed structural histories in the SW part of the Southern Uplands are reviewed. The evolutionary sequences described from the southern part of the Central Belt are characteristic of a fold/thrust fault system which has been affected by strike-slip deformation. The present structure is characterized by tectonic domains usually less than 2 km across strike which show different internal deformation patterns and histories. The generalized deformation history of the area involves downslope movement, thrusting and folding followed by strike-slip deformation. The domain character of the area is considered to have developed by the juxtaposition of blocks throughout this deformation history. The concentration of anastomosing stratal disruption zones (developed by mixing of partially lithified sediment during deformation), and the geometry of folds and faults indicate the presence of an important shear zone towards the base of the Central Belt. A complex relationship between faulting, folding and cleavage development exists within this shear zone. Although cleavage development appears to post-date movement in some disruption zones, there is evidence that the disruption zone displacement was synchronous with or continued after cleavage development. These features indicate that the shear zone had a complex movement history spanning the lithification of the sediments. The structural histories described are compatible with an accretionary wedge model for the area although the nature of the basement which underlay the Southern Uplands during its evolution cannot be assessed from the outcrop-scale structures.

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