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Geological Society, London, Special Publications; 1984; v. 14; p. 125-129;
DOI: 10.1144/GSL.SP.1984.014.01.12
© 1984 Geological Society of London

Britain

Thin-skinned tectonics, basement control and the Variscan front

Robert M. Shackleton

Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, England

The thin-skinned interpretation of Variscan structures in southern England, Wales and Ireland, based on structural and seismic evidence, is used to define the Variscan front as the northern limit of the thin-skinned structures. The original front was where displacement on the décollement surface diminished to zero. The present front, eroded back from its original line, is near the line previously accepted as the Variscan front. Caledonian (and in places older) structures control the Variscan deformation north of the front. They can also be traced south of it, as post-Variscan structures which have propagated up through the décollement. A zone of ENE-WSW structures in south Cornwall is thought to reflect the influence of Cadomian basement where the basal thrust has cut down into it.





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Geological Society, London, Special Publications, 1999; 155: 233 - 245.
[Abstract] [PDF]