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Geological Society, London, Special Publications; 1995; v. 91; p. 103-122;
DOI: 10.1144/GSL.SP.1995.091.01.06
© 1995 Geological Society of London

Influence of basement on the geometry of Permo-Triassic basins in the northwest British Isles

T. B. Anderson, J. Parnell & A. H. Ruffell

School of Geosciences, The Queen’s University of Belfast, Belfast BT7 1NN, UK

The orientation and shape of Permo-Triassic basins in the northwest British Isles are strongly influenced by the structure of the underlying basement. In the Hebridean region, NE-SW-elongated basins are controlled by reactivated Caledonian thrusts. Further south, the variable orientation of elongate basins reflects the local fabric of the Dalradian basement. In the Midland Valley of Scotland and Northern Ireland, Permo-Triassic basins have a less regular shape, as they are sited on Carboniferous basins with a weakly pronounced structural fabric: the NNW-SSE-elongation of some outcrops reflects the effects of later (Tertiary) faulting along this trend. In the Southern Uplands lower Palaeozoic basement, bedding and cleavage are tectonically aligned to produce a strong ENE-WSW high angle anisotropy, cross-cut by complicated arrays of steeply inclined faults. Crustal stretching would have occurred normal or parallel to the anisotropy: Permo-Triassic basins, typically elongate NNW-SSE, clearly formed in response to contemporary ENE-WSW stretching, producing half-graben by dip-slip reactivation of existing Caledonian fractures.





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