Person:
Córdoba Barba, Diego

Profile Picture
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
Identifiers
UCM identifierORCIDScopus Author IDWeb of Science ResearcherIDDialnet ID

Filters

20152
Reset filters

Settings

Author: Pazos, Antonio × Item Type: Publication × Has files: true × Subject: 550.3 ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Crustal thickness and images of the lithospheric discontinuities in the Gibraltar arc and surrounding areas
    (Geophysical Journal International, 2015) Mancilla Pérez, Flor de Lis; Stich, Daniel; Morales, José; Martín, Rosa; Díaz, Jordi; Pazos, Antonio; Córdoba Barba, Diego; Pulgar, Javier A.; Ibarra, Pedro; Harnafi, Mimoun; González Lodeiro, Francisco
    The Gibraltar arc and surrounding areas are a complex tectonic region and its tectonic evolution.since Miocene is still under debate. Knowledge of its lithospheric structure will help to.understand the mechanisms that produced extension and westward motion of the Alboran domain,.simultaneously withNW–SE compression driven by Africa–Europe plates convergence..We perform a P-wave receiver function analysis in which we analyse new data recorded at.83 permanent and temporary seismic broad-band stations located in the South of the Iberian.peninsula. These data are stacked and combined with data from a previous study in northern.Morocco to build maps of thickness and average vP/vS ratio for the crust, and cross-sections.to image the lithospheric discontinuities beneath the Gibraltar arc, the Betic and Rif Ranges.and their Iberian and Moroccan forelands. Crustal thickness values show strong lateral variations.in the southern Iberia peninsula, ranging from ∼19 to ∼46 km. The Variscan foreland is.characterized by a relatively flat Moho at ∼31 km depth, and an average vP/vS ratio of ∼1.72,.similar to other Variscan terranes, which may indicate that part of the lower crustal orogenic.root was lost. The thickest crust is found at the contact between the Alboran domain and the.External Zones of the Betic Range, while crustal thinning is observed southeastern Iberia.(down to 19 km) and in the Guadalquivir basin where the thinning at the Iberian paleomargin.could be still preserved. In the cross-sections, we see a strong change between the eastern.Betics, where the Iberian crust underthrusts and couples to the Alboran crust, and the western.Betics, where the underthrusting Iberian crust becomes partially delaminated and enters into.the mantle. The structures largely mirror those on the Moroccan side where a similar detachment.was observed in northern Morocco. We attribute a relatively shallow strong negativepolarity.discontinuity to the lithosphere-asthenosphere boundary. This means relatively thin.lithosphere ranging from ∼50 km thickness in southeastern Iberia and northeastern Morocco.to ∼90–100 km beneath the western Betics and the Rif, with abrupt changes of ∼30 km under.the central Betics and northern Morocco. Our observations support a geodynamic scenario.where in western Betics oceanic subduction has developed into ongoing continental subduction/delamination while in eastern Betics this process is inactive.
  • Thumbnail Image
    Item
    Modeling the crust and upper mantle in northern Beata Ridge (CARIBE NORTE Project)
    (Pure and Applied Geophysics, 2015) Núñez Escribano, Diana; Córdoba Barba, Diego; Cotilla Rodríguez, Mario Octavio; Pazos, Antonio
    The complex tectonic region of NE Caribbean, where Hispaniola and Puerto Rico are located, is bordered by subduction zone with oblique convergence in the north and by incipient subduction zone associated to Muertos Trough in the south. Central Caribbean basin is characterized by the presence of a prominent topographic structure known as Beata Ridge, whose oceanic crustal thickness is unusual. The northern part of Beata Ridge is colliding with the central part of Hispaniola along a transverse NE alignment, which constitutes a morphostructural limit, thus producing the interruption of the Cibao Valley and the divergence of the rivers and basins in opposite directions. The direction of this alignment coincides with the discontinuity that could explain the extreme difference between west and east seismicity of the island. Different studies have provided information about Beata Ridge, mainly about the shallow structure from MCS data. In this work, CARIBE NORTE (2009) wide-angle seismic data are analyzed along a WNW-ESE trending line in the northern flank of Beata Ridge, providing a complete tectonic view about shallow, middle and deep structures. The results show clear tectonic differences between west and east separated by Beata Island. In the Haiti Basin area, sedimentary cover is strongly influenced by the bathymetry and its thickness decreases toward to the island. In this area, the Upper Mantle reaches 20 km deep increasing up to 24 km below the island where the sedimentary cover disappears. To the east, the three seamounts of Beata Ridge provoke the appearance of a structure completely different where sedimentary cover reaches thicknesses of 4 km between seamounts and Moho rises up to 13 km deep. This study has allowed to determine the Moho topography and to characterize seismically the first upper mantle layers along the northern Beata Ridge, which had not been possible with previous MCS data.