Person:
Vegas Martínez, Ramón

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First Name
Ramón
Last Name
Vegas Martínez
URI
https://hdl.handle.net/20.500.14352/84115
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Area
Geodinámica Interna
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1988 - 198911990 - 19982
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    Seismic and tectonic interpretation of the ESCI-Béticas and ESCI-Alborán deep seismic reflection profiles: structure of the crust and geodynamic implications
    (Revista de la Sociedad Geológica de España, 1997) Vegas Martínez, Ramón; Vázquez, J.T.; Medialdea, T.; Suriñach, E.
    The seismic and tectonic interpretation of the ESCI-Béticas and ESCI-Alborán deep seismic reflection profiles provides an overall image of the crust on the northern flank of the Betic-Rif orogenic system. In these interpretations, previous wide-angle refraction-reflection and MCS industrial profiles were used in order to identify the sequence of collisional-extensional events that built up the crust in this escape-type orogenic area. A model of convergence between the Iberian crust and the Alborán domain, including coeval extension due to lateral escape, is consistent with the data presented in this paper.
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    Seismic crustal structure in the southwest of the Iberian Peninsula and the Gulf of Cadiz
    (Tectonophysics, 1998) González Fernández, Antonio; Córdoba Barba, Diego; Vegas Martínez, Ramón; Matías, Luis Manuel
    The crust under the southwestern Iberian Peninsula and the Gulf of Cadiz has been sampled by 1200 km of deep seismic refraction=wide-angle reflection profiles, together with many seismic reflection lines and bore-holes. Wide-angle seismic data were collected during the last three decades. Commercial multichannel data provide a detailed image of the uppermost crust, improving the confidence about the models of the deeper structures. P-wave velocities within the thick column of sediments in the Gulf of Cadiz range from 2.0 to 3.8 km=s, while the Algarve and the Sines areas have higher velocities of 4.3 to 4.8 km=s. The top of the Palaeozoic basement rises to the northwest, outcropping in the South Portuguese zone of the Iberian Massif, and is characterized by P-wave velocities of 5.7–5.9 km=s. High velocities of 6.4 km=s have been found at shallow depths of 7 to 10 km in the South Portuguese zone, that could be related to the mafic and ultramafic rocks in the Beja-Acebuches zone. Lower crustal velocities are in the range of 6.7–6.9 km=s. The crustal thickness shows important lateral changes from 29 km beneath the Guadalquivir Basin=Iberian Massif contact to 35 km in the southeastern part of the South Portuguese zone. From the interpretation of these seismic data, a geodynamic model of the evolution of the crust in Southwestern Iberia and the Gulf of Cadiz is proposed. The Guadalquivir Basin, and its continuation at sea, the Gulf of Cadiz, is a flexure area of the crust that could be related to the overloading due to the overthrusting of the Alboran Domain over the Iberian plate.
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    Sobre la existencia de dos cuñas de corteza en Galicia oriental según resultados de sísmica profunda. Implicaciones geodinámicas
    (Geogaceta, 1988) Vegas Martínez, Ramón; Córdoba Díaz, Damián
    A sílice of granulites has been interpreted from deep seismic sounding data at a depth of B km in eastern Galicia (NW Spain). This leads to the definition of the sole Hercynian thrust and two different crustal wedges that result from the asymmetrical shortening of the continental crust.