Person:
Córdoba Barba, Diego

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First Name
Diego
Last Name
Córdoba Barba
URI
https://hdl.handle.net/20.500.14352/75149
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Física de la Tierra y Astrofísica
Area
Física de la Tierra
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Author: Vegas, Ramón × End date: 2009 × Start date: 2000 × Item Type: Publication ×

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Now showing 1 - 2 of 2
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    Adelgazamiento de la corteza en el margen septentrional del Golfo de Cádiz
    (Geotemas, 2004) Medialdea Cela, Teresa; Córdoba Barba, Diego; Vegas, Ramón; Dañobeitia, J.J.
    Refraction/wide angle seismic profiles acquired in 2000 during the Parsifal cruise across the Southportuguese Zone, the Algarve Basin and the South Iberian continental margin have allowed us to determine the crustal structure west of the Bank of Guadalquivir, which has been constrained by gravity modelling. According to the crustal model obtained, a crustal thinning of 11 km takes place from the shoreline to the Guadalquivir Bank area, where enhanced crustal attenuation has been found. Under the sedimentary cover, the velocity structure consists of a wedge-shaped upper crust with velocities between 5.8 and 5.9 km/s, characterised by a pronounced thickness variation. In the middle-lower crust, velocity increases from 6 to 7 km/s.
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    Structure and evolution of the ‘‘Olistostrome’’ complex of the Gibraltar Arc in the Gulf of Cádiz (eastern Central Atlantic): evidence from two long seismic cross-sections
    (Marine geology, 2004) Medialdea Cela, Teresa; Vegas, Ramón; Somoza Losada, Luis; Vázquez Garrido, Juan Tomás; Maldonado López, Andrés; Díaz del Río Español, Víctor; Maestro González, Adolfo; Córdoba Barba, Diego; Fernández Puga, Mª Carmen
    Reflection profiles characterize the structure and the upper Mesozoic to Cenozoic deposits of the Gulf of Ca´diz region. Two long ENE–WSW multichannel seismic lines (ca. 400–500 km long) are analyzed to study the evolution of the area from the continental shelf to the Horseshoe and Seine abyssal plains. The huge allochthonous deposits emplaced in this region (the socalled ‘‘Olistostrome’’ of the Gulf of Cadiz) are described in terms of three different domains on the basis of the seismic architecture, the main tectonic features and the nature of the basement, oceanic or continental. The eastern domain extends along the continental shelf and upper and middle slope and corresponds to the offshore extension of the Betic–Rifean external front. It is characterized by salt and shale nappes later affected by extensional collapses. The central domain develops along the lower slope between the Betic–Rifean front and the abyssal plains and is characterized by a change in dip of the allochthonous basal surface and the basement. The allochthonous masses were emplaced by a combined gravitational and tectonic mechanism. The northern boundary of this domain is marked by the occurrence of an outstanding WNW–ESE-trending thrust fault with a strike-slip component, termed here as the Gorringe–Horseshoe fault. The westernmost domain corresponds to the abyssal plains, where the distal emplacement of the allochthonous body takes place; it is characterized by thrust faults affecting both the sedimentary cover and the oceanic basement. The allochthonous masses show a less chaotic character and the thickness decreases notably. These domains represent different evolutionary steps in the mechanisms of emplacement of the allochthonous units. The eastern domain of the allochthonous units was emplaced as part of the pre-Messinian orogenic wedge related to the collision that gave rise to the Betic–Rifean Belt, whereas the allochthonous wedge of the central and western domains were emplaced later as a consequence of the NE–SW late Miocene compression that continues in present times.