The North cotentin shear-zone (Normandy-France): Variscan mobilization of the cadomian basement and its palaeozoic cover
✍ Scribed by E. Dissler; F. Gresselin
- Book ID
- 102846270
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 1004 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0072-1050
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✦ Synopsis
Detailed structural analysis of the northern part of the Cotentin Peninsula provides evidence for major Variscan reworking of Proterozoic structures. Two stages in the regional evolution of the Variscan orogeny are distinguished: the Palaeozoic Siouville Syncline was formed before the development of a south-facing ductile overthrust. This latter stage is dated as Carboniferous in age from its relationship with the synkinematic intrusion of the Barfleur granitic pluton.
KEY WORDS
NE Armorican Massif North Cotentin Peninsula Structural evolution Ductile shear Cadomian structures Variscan orogeny I. INTRODUCTION On the northern border of the Domnonean palaeogeographical province (CognC 1974), the northern part of the Cotentin Peninsula occupies an important position on the Armorican plate (sensu Perroud 1982; Perroud et al. 1984) as it exhibits the cumulative tectonometamorphic effects of the successive Icartian, Cadomian, and Variscan orogenies. During the Variscan orogeny, the earliest movements were more important in the South (Southern Brittany), leading to the Ligerian collision immediately prior to the Carboniferous intracontinental evolution of western Europe (