Lithospheric-scale folding in Iberia from the perspective of analogue modelling .
[EN] The Iberian Peninsula is characterized by the presence of regularly spaced and generally E-W to NE-SW trending mountain ranges with mainly E-W crustal-scale thrusts across the wholePeninsula. Intraplate deformation resulting from the convergence between the African and Europeanplates during the...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2009 |
| País: | España |
| Institución: | Universidad de León |
| Repositorio: | BULERIA. Repositorio Institucional de la Universidad de León |
| OAI Identifier: | oai:buleria.unileon.es:10612/21713 |
| Acceso en línea: | http://hdl.handle.net/10612/21713 |
| Access Level: | acceso abierto |
| Palabra clave: | Ingeniería de minas Lithospheric Folding Mountain Uplift Pop-up Iberia Intraplate Deformation Alpine Orogeny |
| Sumario: | [EN] The Iberian Peninsula is characterized by the presence of regularly spaced and generally E-W to NE-SW trending mountain ranges with mainly E-W crustal-scale thrusts across the wholePeninsula. Intraplate deformation resulting from the convergence between the African and Europeanplates during the Tertiary caused a regular distribution of the main topographic heights and is oftenrelated to lithospheric buckling. Consequently, basement structures were reactivated as fault corridorscoeval with inversion of the Mesozoic rifts. For gaining insights into the effects of different crustal andmantle rheologies, on the structural and topographic expression of lithospheric buckling, the analoguemodelling approach has been employed. Varying the shortening velocity and, hence, the strength ofthe ductile layers demonstrate that high strength of the ductile crust and upper ductile mantle leads toan increase in lithospheric fold wavelength(s). The folding is associated with the formation of narrowmountain ranges, which are represented by upper crustal pop-ups forming the main topographicreliefs. Shortening is accommodated within the viscous crust underneath the pop-ups by homogeneousthickening leading to lateral thickness variations of the ductile crust. Such thickness variations are inagreement with seismic and gravity data from the Spanish Central System and Toledo Mountains.Experiments performed under low velocities (0.5 cm h-1, representing 7 mm a-1in nature) show closesimilarities to the natural laboratory Iberia in terms of the general shape and distribution of mountainranges and basins. |
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