Tectónica colisional alpina y estructura sísmica de la corteza entre el Pirineo y la Cordillera Cantábrica

  1. D. Pedreira 1
  2. J.A. Pulgar 1
  3. J. Gallart
  4. D. Córdoba
  5. J. Díaz
  6. R. Carbonell
  7. J.J. Dañobeitia
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Año de publicación: 2000

Título del ejemplar: V Congreso Geológico de España (Alicante, 10-14 julio 2000)

Número: 1

Páginas: 79-82

Tipo: Artículo

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Otras publicaciones en: Geotemas (Madrid)

Resumen

The crustal structure of the transition zone between the Pyrenees and the Cantabrian Mountains was investigated from a set of seismic refraction / wide angle reflection profiles acquired in 1997. An E-W profile of 540 km shows important variations in crustal thickness and velocity distribution from the Cantabrian Mountains to the Western Pyrenees. A continuous Alpine crustal root is observed, with Moho depths of 46-48 km, except for the Western part of the Basque Cantabrian Basin, where the Moho is located at about 40 km. Another outstanding feature is the inferred presence of a discontinuous layer of 6.40-6.90 km s~’ at midcrustal depths beneath the Cantabrian Mountains and the Eastern Basque-Cantabrian Basin. Some geological and geophysical constraints suggest that it can represent a wedge of the lower crust of the Cantabrian Margin indenting the Iberian crust during the Alpine compression. This indentation was conditioned and/or affected by some NE-SW structures and this explains its discontinuous presence along the profile. The anomalously low velocity for this lower crustal material could be a consequence of its intense deformation during the collision and crustal indentation

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