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Journal of the Geological Society; 2000; v. 157; issue.1; p. 93-104
© 2000 Geological Society of London

Paper

Late Carboniferous tectonic subsidence in South Wales: implications for Variscan basin evolution and tectonic history in SW Britain

PETER M. BURGESS1 & ROD A. GAYER1

1 Department of Earth Sciences, University of Cardiff, PO Box 914, Main Building, Park Place, Cardiff CF1 3 YE, UK (e-mail: BurgessPM{at}cf.ac.uk)

Scientific editing by Alex Maltman.

Detailed stratigraphic data have been used to backstrip seven sections from the Carboniferous South Wales coal basin. Resulting tectonic subsidence curves for the interval 319–305 Ma (Namurian–Westphalian D) are convex-up, indicating increasing subsidence rate with time, with rates between 130 and 250 m Ma–1, suggesting a foreland basin setting. Forward modelling of subsidence due to flexural loading in front of a propagating orogenic wedge shows that an orogenic load migrating in a north-northeasterly direction across SW England between 319 and 305 Ma could have generated the backstripped subsidence patterns. Sensitivity tests show that while many of the forward model parameters are poorly constrained, and the model results non-unique, backstripped subsidence patterns allow reasonable constraint on the different model cases, so that model predictions can be treated as one possibility in a limited range. The predicted load evolution is consistent with current knowledge of tectonic and stratigraphic features of SW England. These results suggest that subsidence in other Late Carboniferous UK basins may also have been influenced by flexure due to a propagating orogenic load.


Keywords: SW Britain, South Wales, Variscan orogeny, subsidence, tectonics.




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