The effects of differential shortening and competent blocks on the structural development of Andean fold-and-thrust belts at 32°-34°S: Insights from analogue models

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dc.contributor.authorJara, P.
dc.contributor.authorHerrera, S.
dc.contributor.authorVillarroel, M.
dc.contributor.authorPinto, L.
dc.contributor.authorYagupsky, D.
dc.contributor.authorGuzman, C.
dc.contributor.authorGutiwrrez, M.
dc.date.accessioned2025-01-20T20:08:12Z
dc.date.available2025-01-20T20:08:12Z
dc.date.issued2023
dc.description.abstractAndean fold-and-thrust belts (FTBs) in the western border of South America show important along-strike variations in their structural style (thin- or thick-skinned) and shortening magnitudes, among others. These variations can arise from multiple factors, such as depth-to-detachment, geometry, and thickness of underlying basins, structural highs, the competence of the units involved in deformation, pre-orogenic structure of the basement, the rheological state of the upper crust or latitudinal gradients in shortening, among others. We carry out a set of new analogue models to understand how two of these factors affect the development and the geometry of the thrust systems within the Andean Principal Cordillera and adjacent fold-and-thrust belts at 32 & DEG;-34 & DEG;S (La Ramada and Aconcagua FTBs). In this contribution, we present the results of analogue modeling of doubly-vergent thrust systems with a built-in heterogeneity that allow us to evaluate the influence of differential shortening and presence of competent blocks (of relatively higher cohesion) in the generation, evolution, and structural setting of Andean FTBs. We highlight that despite the similar pattern of differential shortening in the models, the presence of the competent block has a significant influence on the structural configuration and leads to greater topographic uplift. Differential shortening plays a role in accommodating deformation, but when a competent block is present, the faults bounding the block control the deformation, producing a notable curvature of the FTBs. Summarizing, the presence of a competent block significantly influences the structural configuration within a doubly-vergent thrust system, emphasizing the role of inherited architecture in the orogenic growth of the Southern Central Andes.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.jsames.2023.104471
dc.identifier.eissn1873-0647
dc.identifier.issn0895-9811
dc.identifier.urihttps://doi.org/10.1016/j.jsames.2023.104471
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91880
dc.identifier.wosidWOS:001040396700001
dc.language.isoen
dc.revistaJournal of south american earth sciences
dc.rightsacceso restringido
dc.subjectAnalogue models
dc.subjectFold and thrust belt
dc.subjectAndes
dc.subjectDifferential shortening
dc.subjectCompetent block
dc.subjectUplift
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleThe effects of differential shortening and competent blocks on the structural development of Andean fold-and-thrust belts at 32°-34°S: Insights from analogue models
dc.typeartículo
dc.volumen128
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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