Origin of oblique structures controlled by pre-tectonic thickness variations in frictional and salt-bearing fold-and-thrust belts: Insights from analogue modelling
Santolaria, Pablo ; Izquierdo-Llavall, Esther ; Soto, Ruth ; Román-Berdiel, Teresa (Universidad de Zaragoza) ; Casas-Sainz, Antonio (Universidad de Zaragoza)
Resumen: This work includes, first, a synthesis of experimental analogue modelling programs assessing the influence of along-strike thickness variations in the development of oblique structures in fold-and-thrust belts. As a second part, we present a new experimental program testing, systematically, the influence of tapered décollement-cover thrust wedges.
Previous experiments show that frictional, brittle models feature numerous, short-wavelength structures where the cover is thinner. Deformation fronts are totally or locally oblique to the backstop when the cover thinning is progressive or sharp, respectively. Low (<30°) or higher structural obliquities occur when thickness variations are progressive or sharp, respectively. The addition of a basal or intermediate décollement, commonly entails the transference of deformation towards its external pinch-out. Consequently salients occur and transfer zones and oblique structures form over décollement boundaries. Their location and orientation strongly depend on the pre-compressional shape of the décollements. Furthermore, as demonstrated by our modelling results, tapered brittle covers over viscous décollements result in asymmetric thrust wedges formed by structures that end or change their vergence laterally, resulting in obliquities generally <30°.
Two natural case studies, showing strong (South Pyrenean Central Salient) or moderately oblique (Keping Shan fold-and-thrust belt) structures are revisited and compared to the described analogue models.
Idioma: Inglés
DOI: 10.1016/j.jsg.2023.105042
Año: 2023
Publicado en: Journal of Structural Geology 179 (2023), 105042 [23 pp.]
ISSN: 0191-8141
Financiación: info:eu-repo/grantAgreement/ES/MICINN/CGL2016-77560-C2
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2019-108753GB-C22
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2020-114273GB-C22
Tipo y forma: Article (Published version)
Área (Departamento): Área Geodinámica Interna (Dpto. Ciencias de la Tierra)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. If you remix, transform, or build upon the material, you may not distribute the modified material.
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Previous experiments show that frictional, brittle models feature numerous, short-wavelength structures where the cover is thinner. Deformation fronts are totally or locally oblique to the backstop when the cover thinning is progressive or sharp, respectively. Low (<30°) or higher structural obliquities occur when thickness variations are progressive or sharp, respectively. The addition of a basal or intermediate décollement, commonly entails the transference of deformation towards its external pinch-out. Consequently salients occur and transfer zones and oblique structures form over décollement boundaries. Their location and orientation strongly depend on the pre-compressional shape of the décollements. Furthermore, as demonstrated by our modelling results, tapered brittle covers over viscous décollements result in asymmetric thrust wedges formed by structures that end or change their vergence laterally, resulting in obliquities generally <30°.
Two natural case studies, showing strong (South Pyrenean Central Salient) or moderately oblique (Keping Shan fold-and-thrust belt) structures are revisited and compared to the described analogue models.
Idioma: Inglés
DOI: 10.1016/j.jsg.2023.105042
Año: 2023
Publicado en: Journal of Structural Geology 179 (2023), 105042 [23 pp.]
ISSN: 0191-8141
Financiación: info:eu-repo/grantAgreement/ES/MICINN/CGL2016-77560-C2
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2019-108753GB-C22
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2020-114273GB-C22
Tipo y forma: Article (Published version)
Área (Departamento): Área Geodinámica Interna (Dpto. Ciencias de la Tierra)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. If you remix, transform, or build upon the material, you may not distribute the modified material. Exportado de SIDERAL (2024-03-01-14:53:52)
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Record created 2024-03-01, last modified 2024-03-01