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Geological Society, London, Special Publications; 1990; v. 51; p. 95-114;
DOI: 10.1144/GSL.SP.1990.051.01.07
© 1990 Geological Society of London

Armorican Massif

Cadomian tectonics in northern Brittany

J. P. Brun & P. Balé

Laboratoire de Tectonique, CAESS (CNRS), Campus de Beaulieu, Université de Rennes, 35042 RENNES Cedex, France

Major Cadomian structures of northern Brittany, France, are reviewed from the Léon region in the west to the Mancellian region in the east. The whole region is dominated by a NE trending structural grain. From the NW to the SE three main tectonic units have been distinguished: (a) the Trégor volcanic and plutonic belt; (b) the Baie de St Brieuc metamorphic-thrust belt and (c) the Guingamp-St Malo high temperature belt. Principal strain trajectories, finite strain measurements, shear criteria and geochronological data are used to establish a kinematic model of Cadomian deformation. The three units have been thrust over each other and towards the SW at 590–580 Ma. An extrapolation at a regional scale is made using available geophysical data (gravimetry, magnetism and SWAT seismic lines). A new model for oblique thrusting toward the SW along an ENE trending plate boundary is proposed.





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J. L. Vigneresse and J. P. Burg
Strain-rate-dependent rheology of partially molten rocks
Geological Society, London, Special Publications, 2004; 227: 327 - 336.
[Abstract] [PDF]