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Tectonic style and structural analysis of the Puebla de Guzmán Antiform (Iberian Pyrite Belt, South Portuguese Zone, SW Spain)

By
Elena M. Mantero
Elena M. Mantero
Departamento de Geodinámica y Paleontología, (Universidad de Huelva)Campus ‘El Carmen’, 21007 Huelva,Spain
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Francisco M. Alonso-Chaves
Francisco M. Alonso-Chaves
Departamento de Geodinámica y Paleontología, (Universidad de Huelva)Campus ‘El Carmen’, 21007 Huelva,Spain
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Encarnación García-Navarro
Encarnación García-Navarro
Departamento de Geodinámica y Paleontología, (Universidad de Huelva)Campus ‘El Carmen’, 21007 Huelva,Spain
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Antonio Azor
Antonio Azor
Departamento de Geodinámica, (Universidad de Granada)Campus de Fuentenueva, 18002 Granada,Spain
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Published:
January 01, 2011

Abstract

In the South Portuguese Zone (Iberian Massif), thin-skinned tectonics linked to the collision with the Ossa-Morena Zone produced the inversion of previous extensional basins in Carboniferous times. Its central domain, namely the Iberian Pyrite Belt, underwent two deformation phases at mostly low-grade metamorphic conditions linked to a progressive deformation migrating upwards from a basal detachment and from north to south. The Puebla de Guzmán Antiform is one of the most outstanding cartographic structures in the Iberian Pyrite Belt, representing a imbricate fan thrust system developed during the second regional deformation phase. In the Puebla de Guzmán Antiform, the first deformation phase gave rise to a penetrative slaty cleavage (S1), which is also recognized in the whole Iberian Pyrite Belt and constitutes the main foliation all over the region. Its genesis is possibly linked to the coetaneous development of thrusts at deeper crustal levels and SSW-vergent folds at all levels above these thrusts. First phase structures were deformed by large-scale imbricated thrust systems with lateral (NNE–SSW) and frontal (WNW–ESE) ramps, which constitute the most relevant regional cartographic structures. This second deformation phase generated thrusts, two set of folds with WNW–ESE and NNE–SSW-oriented axes, as well as two related axial plane crenulation cleavages. These relatively brittle to ductile-brittle second phase structures have been identified in many areas of the Iberian Pyrite Belt, and especially in the southern limb of the Puebla de Guzmán Antiform. The second phase thrusts reported from the Puebla de Guzmán Antiform have not been folded according to both the geological map of the area and the analysis of maximum shortening and stretching axes.

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Contents

Geological Society, London, Special Publications

Kinematic Evolution and Structural Styles of Fold-and-Thrust Belts

J. Poblet
J. Poblet
Universidad de Oviedo, Spain
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R. J. Lisle
R. J. Lisle
Cardiff University, UK
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Geological Society of London
Volume
349
ISBN electronic:
9781862395978
Publication date:
January 01, 2011

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