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Variscan structures in the Kent Coalfield, southeast England, and their regional significance

Published online by Cambridge University Press:  01 November 1997

J. H. RIPPON
Affiliation:
Department of Earth Sciences, University of Keele, Staffordshire ST5 5BG, UK Present address: International Mining Consultants Ltd., PO Box 18, Huthwaite, Sutton-in-Ashfield, Nottinghamshire NG17 2NS, UK
R. A. GAYER
Affiliation:
Department of Earth Sciences, University of Keele, Staffordshire ST5 5BG, UK
M. MILIORIZOS
Affiliation:
Department of Earth Sciences, University of Wales, PO Box 914, Cardiff CF1 3YE, UK

Abstract

The Upper Carboniferous Kent Coalfield lies concealed beneath various Mesozoic formations, its southern areas lying about 20 km north of the commonly accepted position of the main Variscan Deformation Front. However, despite intense intra-coal deformation, the existing literature is ambivalent about compressional Variscan features in Kent, the general view being that coal deformation is largely the product of the depositional environment. The main deformation is interpreted here as the result of Variscan compression, the structural style being imposed by the sandstone-dominated lithology. This conclusion is necessitated by the regularity of deformational structures revealed by mine workings, and supported by coal sequence irregularities suggestive of thrusting, especially in the lower Westphalian strata, all of which is paralleled in parts of the South Wales Coalfield. The Kent data indicate that, as in South Wales, a zone of thrusting many tens of kilometres wide lies in advance of the main deformation front. Structural trends are consistent with an overall swing in the front from east–west across much of central-southern England, to more northwest–southeast across northeastern France. This swing may represent a transpressional transfer zone, within which stress deflection and block rotation produced thrust vergence oblique to the overall direction of maximum compression.

Type
Research Article
Copyright
© 1997 Cambridge University Press

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