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- Title
Tectonothermal evolution of a foreland fold and thrust belt: the Cantabrian Zone (Iberian Variscan belt, NW Spain).
- Authors
García-López, Susana; Brime, Covadonga; Valín, M. Luz; Sanz-López, Javier; Bastida, Fernando; Aller, Jesús; Blanco-Ferrera, Silvia
- Abstract
Analysis of the conodont colour alteration index and the Kübler index of illite allowed us the characterization of four types of very low- or low-grade metamorphism in the Cantabrian Zone (CZ) and determination of their regional and temporal distribution. These types are: (1) an orogenic Variscan metamorphism present only in restricted areas of the western and north-western parts of the CZ where epizonal conditions are reached; (2) a burial metamorphism that appears in the basal part of some nappes, where anchizonal conditions are sometimes achieved; the thermal peak preceded emplacement of the nappes; (3) a late-Variscan metamorphism in the southern and south-eastern parts of the CZ; a cleavage, cutting most of the Variscan folds, is associated with this metamorphism, which has been related to an extensional episode; (4) a contact metamorphism and hydrothermal activity associated with minor intrusive bodies. The extension continued after the Variscan deformation giving rise to hydrothermal activity during Permian times.
- Subjects
SPAIN; METAMORPHISM (Geology); ILLITE; NAPPES (Geology); STRUCTURAL geology; FOLDS (Geology); IGNEOUS intrusions; CANTABRIANS; CLEAVAGE of rocks; PERMIAN stratigraphic geology
- Publication
Terra Nova, 2007, Vol 19, Issue 6, p469
- ISSN
0954-4879
- Publication type
Article
- DOI
10.1111/j.1365-3121.2007.00773.x