Publication: Correlación de cinturones de alta presión en el NO y SO de Iberia: la zona de sutura Devónica Superior del Macizo Ibérico y la definición del Complejo
Alóctono de Ossa-Morena
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Publication Date
2016
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Sociedad Geológica de España.
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Abstract
La correlación de tres cinturones de alta-P y baja a media-T del NO y SO de Iberia basada en la edad de dicho metamorfismo, su litostratigrafía y tectonostratigrafía regional, y apoyada por la geometría de estructuras regionales mayores, permite el reconocimiento de un único terreno afectado por un proceso de subducción continental de edad Devónico Superior durante la orogenia Varisca. Este terreno se localiza por encima de dominios caracterizados en su mayoría por una evolución metamórfica Varisca inicial Barroviense, normalmente seguida de un metamorfismo de alta-T y media a baja-P. Este terreno de alta-P se encuentra bajo un conjunto de unidades ofiolíticas desmembradas, variables en edad y composición. Este terreno de alta-P es un trazador inequívoco de la base cabalgante de los complejos alóctonos del NO de Iberia, y también aparece hacia la base de la mayoría de la denominada Zona de Ossa-Morena que, en consecuencia, resulta ser un complejo alóctono más del Macizo Ibérico. El Complejo de Ossa-Morena junto con los complejos alóctonos del NO de Iberia conforman un manto alóctono desenraizado que fue transportado hacia el interior de Gondwana durante la colisión de este último con Laurrusia para formar Pangea.
A correlation of three high-P and low to intermediate-T belts from NW and SW Iberia based on the age of high-P metamorphism, lithostratigraphy, and regional tectonostratigraphy, and supported by the geometry of major regional structures, allows the recognition of a single terrane affected by Late Devonian continental subduction during the Variscan orogeny. This terrane is located on top of sections of the Variscan orogen mostly characterized by Barrovian metamorphism, usually followed by high-T and medium/low-P metamorphism. This high-P terrane occurs below a set of dismembered ophiolitic units, variable in age and composition. This high-P terrane is located in the lower part of the allochthonous complexes of NW Iberia, and in a lower position in most of the Ossa Morena Zone that, therefore, emerges as another allochthonous complex of the Iberian Massif. The Ossa Morena Complex together with the allochthonous complexes of NW Iberia form a huge rootless nappe that was transported towards mainland Gondwana during its collision with Laurussia to form Pangea.
A correlation of three high-P and low to intermediate-T belts from NW and SW Iberia based on the age of high-P metamorphism, lithostratigraphy, and regional tectonostratigraphy, and supported by the geometry of major regional structures, allows the recognition of a single terrane affected by Late Devonian continental subduction during the Variscan orogeny. This terrane is located on top of sections of the Variscan orogen mostly characterized by Barrovian metamorphism, usually followed by high-T and medium/low-P metamorphism. This high-P terrane occurs below a set of dismembered ophiolitic units, variable in age and composition. This high-P terrane is located in the lower part of the allochthonous complexes of NW Iberia, and in a lower position in most of the Ossa Morena Zone that, therefore, emerges as another allochthonous complex of the Iberian Massif. The Ossa Morena Complex together with the allochthonous complexes of NW Iberia form a huge rootless nappe that was transported towards mainland Gondwana during its collision with Laurussia to form Pangea.