Geometry and Late-Miocene to the Recent evolution of the western Betics external orogenic wedge
The external zones of orogens are frequently deformed into fold-and-thrust belts. Fold-and-thrust belts depict wedges in crosssection defined by the α angle, which is the slope of the syn-orogenic topography, and β angle, which is the basal detachment’s dip The aim of this work is to study the geome...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | inglés |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/25009 |
| Acceso en línea: | https://hdl.handle.net/10272/25009 |
| Access Level: | acceso abierto |
| Palabra clave: | Fold-and-thrust belt Taper angle Wedge propagation Basement topography Topografía del basamento Cinturón de pliegues y cabalgamientos Ángulo de la cuña Propagación de la cuña 2506 Geología |
| Sumario: | The external zones of orogens are frequently deformed into fold-and-thrust belts. Fold-and-thrust belts depict wedges in crosssection defined by the α angle, which is the slope of the syn-orogenic topography, and β angle, which is the basal detachment’s dip The aim of this work is to study the geometry and evolution of the western Betics wedge and to compare with the Central Betics. To do that, geological cross-sections, interpretation of seismic profiles and well data were used. The overall α angle is 1.34º, however, a sharp topographic drop coincides with a change in the structural style within the fold-and-thrust belt. Both fold-and-thrust belt segments analysed separately yield α angles lower than 0.6º. The angle β at the external wedge is ca. 3º. There are no evidences of steps in the basement top topography. Consequently, the western Betics wedge probably propagated since the Early Miocene to Recent without significant stagnation during its front propagation, unlike the central Betics wedge. Recent propagation of the deformation accreted the internal parts of the foreland basin (Serravallian to Quaternary sediments) to the Betics fold-and-thrust belt |
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