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handle: 10261/5692 , 20.500.14352/57813
[ES] La Cuenca Ibérica es una cuenca extensional que se forma en el Pérmico Inferior y se desarrolla en el Mesozoico. Los sedimentes aluviales de edad pérmica y triásica se subdividen en tres macrosecuencias limitadas por discordancias o liiatus y sus características sedimentológicas, paleocorrientes y espesores demuestran el control ejercido durante suacumulación por el proceso distensiyo muiltifásico y la geometría y evolución de las fallas límite de cuenca. Se evoluciona de cuencas aisladas con aportes transversales dominantes a una cuenca única, mucho mayor, con aportes longitudinales. La tasa de subsidencia varió ampliamente, acelerándose o decelerándose en un factor de 35 veces, reflejándose estas variaciones en la relación canales-llanura de inundación y en las características de los canales (aislados, «multistorey», etc...) Finalmente, se propone una posible génesis comdnpara las cuencas pérmico-triásicas de Pirineos, Ebro e Ibérica a favor de un despegue cortical relativamente poco profundo.
[EN] The Iberian Basin is an extensional basin originated in the Early Permian and developed along the Mesozoic. The Permian-Triassie alluvial sediments are subdivided into titree unconformity-bounded macrosequences and their sedimentology, paleocurrents and thickness were controlled by the multiphasic extensional process and the geometry and dynamics of the basin boundary faults. From small isolated basins with transverse sediment flux, it evolves into a larger basins with longitudinal flux. Subsidence rate varies widely with time (up tú 35 times) and these changes caused variations in the channel-floodplain deposits ratio and the channel style (isolated, multistorey, etc..). Finally, a common origin for the Permian-Triassic Ebro, Pyrenean and Iberian Basins is proposed, along shallow, gently dipping crustal detachement.
Este trabajo ha sido financiadopor los Proyectos PB92-0041 y PB95-0084 de la DGICYT.
Peer reviewed
2506.19 Estratigrafía, Subsidence curves, Geología estratigráfica, Estilos fluviales, Cuenca Ibérica, Multipitasie extension, Iberian basin, Fluvial styles, Extensión multifásica, 551.3.051(234.1), Curvas de subsidencia
2506.19 Estratigrafía, Subsidence curves, Geología estratigráfica, Estilos fluviales, Cuenca Ibérica, Multipitasie extension, Iberian basin, Fluvial styles, Extensión multifásica, 551.3.051(234.1), Curvas de subsidencia
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