Publication: Los sistemas filonianos tardihercínicos del Centro Peninsular como resultado de una deformación progresiva dentro de una zona de cizalla transcurrente dextral de escala megacontinental
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1991
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Seminario de Estudos Galegos. Area de Xeoloxía e Minería ; Instituto Universitario de Xeoloxía "Isidro Parga Pondal"
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Abstract
En este trabajo se analiza el contexto geotectónico global de los sistemas filonianos intruidos en el centro peninsular durante tiempos tardihercínicos. Estos sistemas forman tres familias diferenciadas, con el siguiente orden de intrusión:
1) Diques EW de pórfido y aplita; 2) Filones de baritina, de direcciones N65°E a N120oE; y 3) Diques NS de cuarzo, diabasa y lamprófido. La intrusión de estas tres familias de diques puede asociarse con los tres episodios tectónicos tardihercínicos: Uno primer extensional, uno segundo transcurrente dúctil, y un último transcurren te frágiL Tanto estos episodios tectónicos, como los sistemas filonianos, pueden explicarse dentro de un esquema de deformación progresiva en una zona de cizalla transcurrente dextral de escala megacontinental (partiendo del clásico esquema para la provincia tardihercínica europea de ARTHAUD,
F. Y MATTE, Ph., 1977)
In this work we analize the global geotectonic context characterizing the intrusion of different dike sets in central Iberia during late Hercynian times. Three main dike sets might be distinguished, with the following order of intrusion: 1) EW porphyry and aplitic dikes; 2) N65°E to N1200E barite veins; and, 3) NS dikes of quartz, diabase, and lamprophyre_ The intrusion of these three dike sets might be associated with the three late Hercynian tectonic events: A first one extensional, a second one ductile-transcurrent, and a last one brittle-transcurrent. Both these dike sets, and the tectonic events which triggered them, might be understand within a scheme involving progressive deformation within a megacontinental dextral shear zone (following the classical scenario for the late Hercynian european province of ARTHAUD, F. and MATIE, Ph., 1977)
In this work we analize the global geotectonic context characterizing the intrusion of different dike sets in central Iberia during late Hercynian times. Three main dike sets might be distinguished, with the following order of intrusion: 1) EW porphyry and aplitic dikes; 2) N65°E to N1200E barite veins; and, 3) NS dikes of quartz, diabase, and lamprophyre_ The intrusion of these three dike sets might be associated with the three late Hercynian tectonic events: A first one extensional, a second one ductile-transcurrent, and a last one brittle-transcurrent. Both these dike sets, and the tectonic events which triggered them, might be understand within a scheme involving progressive deformation within a megacontinental dextral shear zone (following the classical scenario for the late Hercynian european province of ARTHAUD, F. and MATIE, Ph., 1977)