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Tectonophysics
Article . 2025 . Peer-reviewed
License: CC BY
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https://doi.org/10.2139/ssrn.5...
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Pliocene-Quaternary Deformational Structures in the Eastern Algarve Continental Shelf, Gulf of Cadiz

Authors: Luján, María; Lobo, Francisco José; Mestdagh, Thomas; Carrión-Torrente, Álvaro; Vázquez, Juan Tomás; Fernández-Puga, Mª. Carmen; Van Rooij, David;

Pliocene-Quaternary Deformational Structures in the Eastern Algarve Continental Shelf, Gulf of Cadiz

Abstract

The eastern Algarve continental shelf in the northern margin of the Gulf of Cadiz has been investigated by analysing a set of high-resolution seismic reflection profiles. We examine the major structural elements affecting the upper sedimentary units. A seismo-stratigraphic interpretation and regional correlation allowed the identification of a major discontinuity that separates two main intervals, pre-Middle Pleistocene (MP) and post-MP. In addition, a number of deformation features such as ENE-WSW to NE-SW thrusts, kilometric-scale N-S to NW-SE folds and NNE-SSW to NNW-SSE sub-vertical normal faults were identified affecting the Pliocene-Quaternary sedimentary record, indicating neotectonic activity. The structures pre-dating MP are in agreement with a dominant transpressive regime along the continental shelf, under the Late Cenozoic NW-SE oblique convergence and related to the reactivation of Mesozoic diapiric structures. The structures post-dating MP induce a lower deformation of the sedimentary cover but were still active during the last glacial maximum, in agreement with the low uplift recognized in the Portuguese mainland La plataforma continental del Algarve en el margen septentrional del Golfo de Cádiz ha sido investigada mediante el análisis de una red de perfiles sísmicos de alta resolución. Se presentan las principales estructuras que afectan a la cobertera sedimentaria superficial. Una interpretación sismoestratigráfica y correlaciones a nivel regional han permitido diferenciar dos intervalos separados por una discontinuidad principal, anterior y posterior al Pleistoceno Medio (PM). Los depósitos del Plioceno y Cuaternario están deformados por estructuras de deformación tales como cabalgamientos ENEOSO a NE-SO, pliegues N-S a NO-SE de escala kilométrica y fallas subverticales NNE-SSO a NNO-SSE, que indican actividad neotectónica. Las estructuras anteriores al PM se generan en relación con el régimen transpresivo (NO-SE) dominante a fInales del Cenozoico en esta región y la reactivación de las estructuras diapíricas mesozoicas observadas en el margen. En cambio, las estructuras posteriores al PM producen una ligera deformación de la cobertera sedimentaria y actividad durante el último máximo glaciar, lo que concuerda con un moderado levantamiento tectónico observado en la zona continental del margen portugués

Countries
Belgium, Spain
Keywords

ATLANTIC, MARGIN, seismic stratigraphy, IBERIAN PENINSULA, SALT TECTONICS, AFRICA PLATE BOUNDARY, Golfo de Cádiz, OFFSHORE, Estratigrafía sísmica, CONTOURITE DEPOSITIONAL SYSTEM, Plataforma continental, Gulf of Cadiz, Earth and Environmental Sciences, ALBORAN SEA, continental shelf, Pliocene-Quaternary deformation, MEDITERRANEAN OUTFLOW WATER, TECTONIC EVOLUTION, Continental shelf, Gulf of Cádiz, Seismic stratigraphy, Deformación pliocena-cuaternaria

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
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.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
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