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Caracterização estrutural da zona de cisalhamento Tomar-Badajoz- Córdova no sector de Abrantes

Authors: Moreira, Noel;

Caracterização estrutural da zona de cisalhamento Tomar-Badajoz- Córdova no sector de Abrantes

Abstract

As zonas de cisalhamento Tomar – Badajoz – Córdova (TBCSZ) e Porto – Tomar – Ferreira do Alentejo (PTASZ) são duas das principais estruturas do Varisco Ibérico, cuja caracterização é fundamental para a compreensão da sua evolução geodinâmica. A região de Abrantes surge então como um sector chave para a caracterização destas estruturas, visto que corresponde à zona de interferência ambas. Os trabalhos em curso sugerem a ocorrência de uma sucessão característica da transição Neoproterozóico-Câmbrico, por correlação com outros sectores da Zona de Ossa-Morena. Foi possível evidenciar a presença de duas fases de deformação dúcteis principais. A primeira fase é responsável pelo desenvolvimento de uma xistosidade mostrando transporte tangencial para o quadrante NW, relacionada com possível formação de uma dobra em bainha quilométrica associada à terminação NW da TBCSZ. A segunda fase de deformação afecta as estruturas anteriores, estado associada a um regime de deformação não-coaxial direito, correlacionável com a PTASZ; ABSTRACT: The Tomar-Badajoz-Cordoba (TBCSZ) and the Porto-Tomar-Ferreira do Alentejo shear zones (PTASZ) are two of the major variscan structures in the Iberian Massif. Their characterization is thus crucial to understand the geodynamic evolution of the Variscan Chain. These two major shear zones interfere in the Abrantes region, making this a key sector for the understanding the Iberian Variscan geodynamics. Ongoing work suggests the occurrence of a characteristic succession of Neoproterozoic-Cambrian transition that could be correlated with other sectors of Ossa-Morena Zone. It was possible to demonstrate the presence of two main phases of ductile deformation. The first phase generates a schistosity showing tangential transport to NW, which could be related with a kilometric sheath fold associated to TBCSZ NW termination. The second deformation phase affects all previous structures, being associated with a non-coaxial deformation regime, induced by PTASZ kinematics.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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