Interaction between perpendicularly-trending thrust wedges and its impact on foreland deformation: insights from analogue modelling
[EN] In this work we used analogue models in order to better understand how two orthogonal fold-and-thrust belts may interact in the foreland and influence the geometry and kinematics of the resulting structures. Our experimental device has two vertical mobile backstops oriented perpendicular with r...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/345383 |
| Acceso en línea: | http://hdl.handle.net/10261/345383 https://api.elsevier.com/content/abstract/scopus_id/85084336946 |
| Access Level: | acceso abierto |
| Palabra clave: | Analogue modelling Thrust wedges Superimposed stress fields Foreland deformation |
| Sumario: | [EN] In this work we used analogue models in order to better understand how two orthogonal fold-and-thrust belts may interact in the foreland and influence the geometry and kinematics of the resulting structures. Our experimental device has two vertical mobile backstops oriented perpendicular with respect to each other, independent and moving coevally with variable or equal velocities. There are strong contrasts between our models' results and thrust wedges generated using a unique indenter and simple convergence. Thrust-wedge deformation in front of two perpendicular indenters overlying a basal viscous décollement progressed following two major stages: (I) independent growth of each tectonic wedges, then (II) formation of major, oblique and continuous structures that nucleated in the foreland of both indenters. In some models, the two indenters moving at different velocities favoured the interference and superimposition of structures, strain partitioning, structure curvature, and vertical-axis rotation. Comparison with the Friulian-Venetian basin (Southern Alps) and the Altomira-Loranca thrust belt (Iberian Chain, Central Spain) supports the hypothesis that foreland deformation can strongly vary if a basal viscous décollement is present during the interaction of two-mutually indenters. |
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