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Hinterland-foreland zonation of the Variscan orogen in the Central Pyrenees: comparison with the northern part of the Iberian Variscan Massif

By
J. García-Sansegundo
J. García-Sansegundo
Departamento de Geología,Universidad de OviedoC/Jesús Arias de Velasco s/n, 33005 Oviedo,Spain
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J. Poblet
J. Poblet
Departamento de Geología,Universidad de OviedoC/Jesús Arias de Velasco s/n, 33005 Oviedo,Spain
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J. L. Alonso
J. L. Alonso
Departamento de Geología,Universidad de OviedoC/Jesús Arias de Velasco s/n, 33005 Oviedo,Spain
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P. Clariana
P. Clariana
Instituto Geológico y Minero de EspañaLa Calera, Tres Cantos, Madrid,Spain
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Published:
January 01, 2011

Abstract

A new sequence of Variscan deformations is proposed for the Palaeozoic rocks of the Central Pyrenees. The non-metamorphic units include south-directed thrust systems and related folds with a poorly developed cleavage. In the metamorphic units north-verging, recumbent to inclined folds (D1), associated with a subhorizontal to south dipping cleavage, are refolded by south-verging, upright to inclined folds (D2), with a subvertical to north-dipping axial plane cleavage, and offset by south-directed thrusts approximately coeval with D2. The structural evolution of these units suggests a subdivision of the Variscan Central Pyrenees into two different regions consistent with the zones known for a long time in the core of the Ibero-Armorican or Asturian arc (northern part of the Iberian Variscan Massif). The structure of the Pyrenean non-metamorphic units has foreland affinities and is comparable to that of the Cantabrian Zone, whereas the deformation observed in the Pyrenean metamorphic units is characteristic of the hinterland and is consistent with the features of the West Asturian–Leonese Zone or Central–Iberian Zone. Since the Pyrenean non-metamorphic units are located southwards of the metamorphic ones and the Variscan thrusts are south-directed, we tentatively correlate the Variscan Pyrenees with the northern branch of the Ibero-Armorican or Asturian arc.

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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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