Rodriguez, J., Coke, C., Dias, R., Pereira, E. and Ribeiro, A. html/views/elements/generate/citation.ctp (line 1) 

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.   Transition from autochthonous to parautochthonous deformation regimes in Murça-Marão sector (Central-Iberian Zone, northern Portugal). In: (Eds.) Rodolfo Carosi, R Dias, David Iacopini, and Gideon Rosenbaum, The southern Variscan belt, Journal of the Virtual Explorer, Electronic Edition, ISSN 1441-8142, volume 19, paper 
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.

Transition from autochthonous to parautochthonous deformation regimes in Murça-Marão sector (Central-Iberian Zone, northern Portugal)

J. Rodriguez

Instituto Nacional de Engenharia Tecnologia e Inovação, Departamento de Geologia, Rua da Amieira, 4466-956 S. Mamede de Infesta, Portugal

C. Coke

Dep. Geologia, Univ. Trás-os-Montes e Alto Douro and LATTEX Portugal.

R. Dias

Dep. Geociências, LIRIO and Centro de Geofísica, Univ. Évora, Convento das Maltezas, 7100-513 Estremoz, Portugal.

E. Pereira

Instituto Nacional de Engenharia Tecnologia e Inovação, Departamento de Geologia, Rua da Amieira, 4466-956 S. Mamede de Infesta, Portugal

A. Ribeiro

Dep. Geologia and LATTEX, Univ. Lisboa, Edifício C2, Piso 5, Campo Grande, 1700 Lisboa, Portugal.

Abstract

A comparison is made between the structures induced by the main variscan deformation tectonic event (D1) in the Autochthon of Central-Iberian Zone (northern Portugal) and in the overlying lower unit of the nappe pile complex of NW Iberia; due to the close lithostratigraphic similarities between both units, the lower allochthonous complex is considered as a Parautochthonous unit

In the Autochthon the D1 tectonic event have produced folds in a transpressive regime where a strong heterogeneous partitioning between the pure and the simple shear components could be emphasize. The amount of partitioning was influenced by the proximity, either to deep structures in the pre-variscan basement or to major sin-kinematic faults.

Concerning the Parautochthonous, several features have controlled the geometry and kinematic of the D1 variscan structures:

  • the existence of stratigraphic levels with specific rheologies (e.g. the Silurian black shales);

  • the obliquity between the transport direction of the thrust nappes and the autochthonous structures;

  • the steepness of the D1 macrofolds in the Autochthon.

The discussion of the distinct behavior of D1 variscan structures in both units allows a better understanding of the geodynamical evolution of the NW Iberian nappe complex. In the proposed model, the upper part of the Parautochthon (with a fold nappe style) was emplaced by a spreading-gliding mechanism, while in the lower part (consisting of an imbricated thrust system) a push-from-the rear mechanism predominates.

Keywords: Variscan, Autochthon, Parautochthon, Nappe emplacement, Transpression, Fold nappe Iberia, Portugal

Table of Contents

Introduction
Geological setting
Lithostratigraphy
The Autochthon sequence of the Marão sector
The Parauchthon sequence of the Murça sector
Lower Parautochthonous Stratigraphy
Upper Parautochthonous stratigraphy
Major Variscan deformation
The tectonic style of the Marão autochthon
The tectonic style of the Murça parauchthon
Geodynamical evolution of nappe emplacement
Conclusions
References
List of Figures
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