
handle: 10272/9837
En el borde sur del Macizo Ibérico, al NE del Alentejo (Portugal) se ha reconocido la zona de cizalla varíscica de Portalegre-Esperanga (PESZ). Esta zona incluye rocas del basamento de Ossa Morena del Proterozoico superior sobre las que reposa, discordante, una secuencia de rocas sedimentarías del Paleozoico Inferior de la Zona Centroibéríca. El análisis estructural de la PESZ revela una compleja arquitectura tridimensional caracterizada por una foliación milonitica muy vertical izad a, una lineación de estiramiento subhorizontal y simultánea una componente direccional (desgarre) y oblicua-direccional (inversa o normal) de sentido sinistrorso. Se ha interpretado como parte de un regimen de deformación transpresivo, en el que predomina una partición de la deformación y una dirección de transporte tectónico paralela al orógeno
Upper crustal levels, Transcurrent transpression, Strain partitioning, Sinistrai shearing, Central-lberian / Ossa-Morena zones boundary
Upper crustal levels, Transcurrent transpression, Strain partitioning, Sinistrai shearing, Central-lberian / Ossa-Morena zones boundary
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