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Geological Society, London, Special Publications; 1991; v. 56; p. 61-78;
DOI: 10.1144/GSL.SP.1991.056.01.05
© 1991 Geological Society of London

Seismic and Subsurface Studies

Deformation around basin-margin faults in the North Sea/mid-Norway rift

Alan M. Roberts & Graham Yielding

Badley Ashton & Associates Limited, Winceby House, Winceby, Horncastle, Lincolnshire LN9 6PB, UK

It has been demonstrated previously that the rigid-domino model of extensional faulting can account well for the uplift/subsidence patterns observed within particular areas of the North Sea rift. This model, however, provides an unsatisfactory solution to deformation occurring at the basin margins.

It is suggested here that the domino model is an elegant, geometric simplification of the more complete flexural-isostatic solution to fault displacements. Application of a flexural model allows a unified treatment of the basin and its margins.

The basin-margins to the North Sea/Mid-Norway rift are all shown to have responded to extensional faulting by experiencing isostatic uplift in the footwalls to the marginal faults. Uplift magnitude varies from a few hundred metres adjacent to small faults to perhaps 5 km adjacent to the largest faults. Uplift patterns can be modelled or predicted by use of the flexural-cantilever basin model.

Recognition of marginal uplift throughout the rift means that geometric section balancing techniques, all of which require the footwall to be rigid during extension, are inapplicable as a method for analysis of large, basement faults within the North Sea.

Marginal, fault-related uplift is considered to have been a primary source of syn-rift clastic detritus. The precise locus of deposition for material eroded from emergent basin margins will depend on local drainage patterns, but deposition in the hangingwall basin and on the footwall platform may both be anticipated.





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