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Shelves around the Iberian Peninsula (II): Evolutionary sedimentary patterns

Authors: Lobo, Francisco José; Durán, Ruth; Ribó, Marta; Bárcenas, Patricia;

Shelves around the Iberian Peninsula (II): Evolutionary sedimentary patterns

Abstract

[ES] Presentamos una visión sintética de los patrones sedimentarios evolutivos de las plataformas continentales de la Península Ibérica, con un énfasis particular en las interpretaciones de estratigrafía secuencial propuestas y con el objetivo de realizar una comparación entre los estilos de construcción de plataformas continentales en el Atlántico y el Mediterráneo. La mayor parte de las plataformas estudiadas muestran un claro predominio de los depósitos progradantes desarrollados durante intervalos de descenso relativo y de bajo nivel del mar, lo cual es particularmente evidente en el registro sedimentario Plioceno-Cuaternario, reflejando el control primario de los cambios glacioeustáticos. Los depósitos transgresivos y de alto nivel del mar previos al Último Máximo Glacial parecen estar mejor representados en plataformas continentales influenciadas por los grandes cursos fluviales. Los depósitos transgresivos postglaciales muestran una gran variabilidad espacial, cambiando lateralmente desde parasecuencias progradantes hasta extensas láminas arenosas. Por el contrario, los depósitos de alto nivel del mar Holocenos muestran un carácter más homogéneo, con desarrollo de cuñas sedimentarias proximales y depocentros fangosos distales. Los diferentes estilos de crecimiento de las plataformas continentales atlánticas de Iberia resultan básicamente de la interacción entre los regímenes deposicionales e hidrodinámicos, observándose una gradación latitudinal de plataformas desde la plataforma erosiva del Mar Cantábrico a la plataforma deposicional del Golfo de Cádiz. Localmente, se identifican algunos sectores de la plataforma que no responden a este patrón general, sino que su crecimiento está controlado por rasgos morfo estructurales (por ejemplo, los ambientes de rías y las plataformas atravesadas por accidentes tectónicos mayores). Los patrones de crecimiento de las plataformas mediterráneas de Iberia están estrechamente relacionados con el aporte fluvial, diferenciándose dos estilos básicos: plataformas con alto aporte y plataformas con bajo aporte sedimentario. El estilo de bajo aporte sedimentario es el tipo más frecuente, el cual puede mostrar una mayor complejidad en función de la existencia de cañones submarinos y/o de rasgos morfoestructurales

[EN] We present a synthetic view of continental-shelf evolutionary patterns around the Iberian Peninsula, focusing on proposed sequence stratigraphy interpretations and attempting a comparison between Atlantic- and Mediterranean-type shelf-margin constructions. Most of the studied shelves show a dominance of regressive to lowstand deposition through successive progradations, particularly evident in the Pliocene-Quaternary, documenting the influence of glacio-eustasy. Transgressive to highstand development predating the Last Glacial Maximum seems to be favoured off major rivers, but the highest variability is seen during postglacial evolution. Transgressive deposits tend to show a higher spatial variability, ranging from prograded parasequences to extensive sand sheets. Holocene highstand deposits usually show a more homogeneous character, with development of proximal wedge-shaped deposits and a distal sheet-like deposition. Atlantic continental shelves off Iberia display three different types of shelf growth: depositional shelves, shelves with restricted progradation and erosional shelves. They result from the interplay between depositional and hydrodynamic regimes, with the occurrence of a latitudinal gradation from erosional shelvesn the Cantabrian continental shelf to depositional shelves in the northern Gulf of Cadiz shelf. Some shelf sectors do not correspond to this general pattern, as shelf sedimentation is mainly controlled by morpho-structural features (e.g., ria environments and shelves crossed by major tectonic accidents). The Mediterranean continental shelves of Iberia show two basic types, high- versus low-supply shelves, and their growth patterns are mainly a response to the amount of fluvial supply. The low-supply style is clearly the most frequent type, and it may show further complexity according to the occurrence of submarine canyons and/or morpho-structural control. © 2015, Instituto Geologico y Minero de Espana. All rights reserved

This paper was completed thanks to the support of the following research projects: CGL2011-30302-C02-02 and CGL2012-33989 funded by the Spanish R+D Program, MOSAICO (P06-RNM-01594) and TESELA (P11-RNM7069) funded by the Andalusian R+D Program. Ruth Durán acknowledges a CSIC JAE-Doc contract co-funded by the FSE. Marta Ribó is supported by a FPI grant (Ref. BES-2010-029949) from the Spanish Ministry of Economy and Competitiveness. Isabel Mendes thanks the Portuguese Foundation for Science and Technology (FCT) for grant SFRH/BPD/72869/2010. This study is a contribution to INQUA IFG: Rapid environmental changes and human impact on continental shelves

Lobo, F.J. et. al.-- 31 pages, 10 figures

Peer Reviewed

Country
Spain
Keywords

Morfoestructura, Sediment supply, Sequence stratigraphy, Aporte sedimentario, Península Ibérica, Glacio-eustasia, Evolución a largo plazo, Long-term evolution, Plataformas continentales, Secuencia estratigráfica, Glacio-eustasy, Morpho-structure, Continental shelves, Iberian Peninsula

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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