Abstract
MAJOR deformational and metamorphic events in the south-armorican metamorphic belt of south Brittany have been considered to be either Cadomian and Variscan1 or Ordo–Silurian (Ligerian) and Variscan2 in age. Geological interest in southern Brittany is, at least in part, focused upon the blueschists3 and the basic–ultrabasic complexes of the area. The largest of these basic–ultrabasic complexes is that of the Baie d'Audierne group (Fig. 1). Although lacking suitable material for direct radiometric or stratigraphical dating, several indirect attempts have been made to date this group, using field data. These are briefly outlined here. It is proposed that the deformational and metamorphic history of this complex is entirely Variscan in age. The implications of this conclusion for the recently proposed plate-tectonic model of Cogné2 are discussed.
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HANMER, S. Age and tectonic implications of the Baie d'Audierne basic-ultrabasic complex. Nature 270, 336–338 (1977). https://doi.org/10.1038/270336a0
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DOI: https://doi.org/10.1038/270336a0
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