Brittle-ductile analogue models of fold-and-thrust belts developed during progressive arching: the effect of viscous basal layer pinch-outs
Two brittle-ductile analogue models of fold-and-thrust belts developed during progressive arching that include silicone pinch-outs either perpendicular or parallel to the backstop apex motion direction (AMD) have been performed to test their role in fold-and-thrust belt geometry and structural evolu...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| 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:10272/16581 |
| Acceso en línea: | http://hdl.handle.net/10272/16581 |
| Access Level: | acceso abierto |
| Palabra clave: | Detachment level Fold-and-thrust belt Analogue modeling Progressive arc Gibraltar Arc Arco de Gibraltar Arco progresivo Nivel de despegue Cinturón de pliegues y cabalgamientos Modelización analógica |
| Sumario: | Two brittle-ductile analogue models of fold-and-thrust belts developed during progressive arching that include silicone pinch-outs either perpendicular or parallel to the backstop apex motion direction (AMD) have been performed to test their role in fold-and-thrust belt geometry and structural evolution. When the silicone pinch-out is oriented perpendicular to the AMD the deformation front stagnates at the silicone pinch-out and arc-parallel lengthening is accommodated by normal and strike-slip faults. When deformation progresses, the wedge thickens and collapses, developing dismantling units. In contrast, when silicone pinch-outs are parallel to the AMD, different structural styles appear along the fold-and-thrust belt: a foreland verging imbricate system where silicone is absent, and a doubly-verging system where silicone is present, both separated by transfer zones. Additionally, the absence of silicone gives place to fold and thrust belt segments relatively narrower in plan-view and vertically thickened. Both models could be useful to delve into both the deposition of dismantling units and the distribution of along-strike structural differences observed in the Gibraltar Arc fold-and-thrust belt |
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