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Geological Society, London, Special Publications; 2004; v. 224; p. 287-305;
DOI: 10.1144/GSL.SP.2004.224.01.18
© 2004 Geological Society of London

Strain removal within the Hercynian Shear Belt of Central Brittany (western France): methodology and tectonic implications

C. Gumiaux, J. P. Brun & D. Gapais

Géosciences Rennes, UMR 6118 CNRS, Campus de Beaulieu, Université de Rennes 1, 35042 Rennes cedex, Francecharles.gumiaux{at}falw.vu.nl

Central Brittany comprises a major shear belt formed during the Hercynian Orogeny. In this paper, we present a model for the restoration of the belt, based on an exhaustive compilation of available structural data. The model uses a geostatistical analysis of cleavage orientation data. The analysis shows that the eastern part of Central Brittany has been deformed by bulk dextral strike-slip, a feature that validates previous structural interpretations. It also provides explanations for: the strain patterns observed within and around the restored domain; the nature of domain boundaries and of associated kinematics; and the occurrence of local superimposed deformations.