Measuring the effects of rheology and regional tectonics on the syntectonic rocks of a migmatitic complex from Cap de Creus
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Abstract
A fin de profundizar en la comprensión de las interacciones entre tectónica
y magmatismo en la corteza media y profunda, se ha realizado un
análisis petroestructural detallado en el sector meridional de Punta dels Farallons-
Volt Andrau (Cap de Creus, Pirineos Orientales). En esta zona, esquistos
de alto grado fueron afectados por fusión parcial e intruídos por una
secuencia de rocas magmáticas intermedias a ácidas durante la fase deformativa
transpresiva varisca (D2). Tanto la tectónica regional como las características
reológicas controlaron el modo de localización de la deformación
en las distintas rocas del complejo migmatítico. Los esquistos y migmatitas
presentan una marcada foliación sub-vertical (S2). Las medidas de deformación
de venas y diques tardíos han permitido determinar la deformación
regional post-emplazamiento. La transpresión dextral fue asociada a un acortamiento
sub-horizontal N-S y la dirección de extensión principal pasó de
sub-vertical a sub-horizontal bajo un régimen constriccional muy próximo a
“plane strain”
To deepening the understanding of the interactions between tectonics and magmatism in the mid to deep crust, a detailed petrostructural analysis has been performed in the southern area of Punta dels Farallons-Volt Andrau (Cap de Creus, Eastern Pyrenees). In this area, schists under high-grade conditions suffered partial melting while a sequence of intermediate to acid magmatic rocks were emplaced during the Variscan D2 transpressive deformation event. Both regional tectonics and rheological features controlled the way deformation localized in the various rocks of the migmatitic complex. Schists and migmatites have a penetrative sub-vertical foliation (S2). Strain measurements of deformed late veins and dykes have allowed us to determine the regional deformation post-dating their emplacement. Dextral transpression was associated to N-S sub-horizontal shortening and the principal extension direction switched from sub-vertical to sub-horizontal under bulk constriction to plane strain
To deepening the understanding of the interactions between tectonics and magmatism in the mid to deep crust, a detailed petrostructural analysis has been performed in the southern area of Punta dels Farallons-Volt Andrau (Cap de Creus, Eastern Pyrenees). In this area, schists under high-grade conditions suffered partial melting while a sequence of intermediate to acid magmatic rocks were emplaced during the Variscan D2 transpressive deformation event. Both regional tectonics and rheological features controlled the way deformation localized in the various rocks of the migmatitic complex. Schists and migmatites have a penetrative sub-vertical foliation (S2). Strain measurements of deformed late veins and dykes have allowed us to determine the regional deformation post-dating their emplacement. Dextral transpression was associated to N-S sub-horizontal shortening and the principal extension direction switched from sub-vertical to sub-horizontal under bulk constriction to plane strain
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