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Martínez Catalán, José Ramón and Arenas Martín, Ricardo and Díaz García, Florentino and Rubio Pascual, Francisco J. and Abati Gómez, Jacobo and Marquínez, Jorge (1996) Subduction and syn-collisional exhumation of a Paleozoic continental margin: an integrated study based on structures and P-T paths of the Basal Units in the Ordenes Complex (Galicia, Spain). Geogaceta, 20 (4). pp. 867-870. ISSN 0213-683X
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Official URL: https://sociedadgeologica.org/publicaciones/geogaceta/geogaceta-20-1996/
Abstract
According to their metamorphic evolution, the Basal Units of the Galician Allochthonous Complexes are thought to represent a part of the margin of the Paleozoic Gondwana, subducted at the onset of the Variscan Orogeny. Variations in the P-T conditions of the first HP metamorphic event along the units suggest an important westward component for the direction of sucduction. Subsequent underthrusting of more continental material blocked the subduction and triggered the ascent and exhumation of the Basal Units whereas the convergence continued. Compressional and extensional structures were synchronous or alternated in time and, together, induced the thinning and tapering of the orogenic wedge. The unroofing took place locally under an inverted temperature gradient, caused by a detachment which carried a part of the hot mantle wedge, above the subduction zone, over the subducted units.
Resumen (otros idiomas)
Según se deduce de su evolución metamórfica las Unidades Basales de fas Complejos Alóctonos de Galicia representan una parte del margen del Gondwana paleozoico, subducida al comienzo de la Orogenia Varíscica. Variaciones en las condiciones P-T del primer evento metamórfico de alta presión en fas diferentes unidades, indican una polaridad de la subducci6n hacia et Oeste. La consiguiente incorporaci6n de nuevo material continental bloqueó la subducción y desencadenó el ascenso y la exhumaci6n de la Unidades Basales mientras la convergencia continuaba. Se desarrollaron a la vez estructuras compresivas y extensionales, o alternaron en el tiempo y, juntas, indujeron el adelgazamiento y agudizamiento de la cufia orogénica. La denudación tectónica se produjo localmente bajo un gradiente inverso de temperatura, causado par un despegue que puso en contacto una parte de la cufia mantélica caliente, situada par encima de la zona de subducción, con las unidades subducidas.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Continental subduction, Syn-orogenic extension, High-pressure metamorphism |
| Subjects: | Sciences > Geology > Geodynamics |
| ID Code: | 69953 |
| Deposited On: | 02 Feb 2022 08:08 |
| Last Modified: | 02 Feb 2022 08:25 |
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