| Título: | Nature and tectonic setting of the Guadalquivier Bank (Gulf of Cadiz, SW Iberian Peninsula) |
| Autores: | Vegas, Ramón ; Medialdea, T. ; Muñoz García, Mercedes ; Díaz del Río, V. ; Somoza, L. |
| Tipo de documento: | texto impreso |
| Editorial: | Sociedad Geológica de España, 2003 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Geodinámica , Tipo = Artículo |
| Resumen: |
During two oceanographic cruises on the Guadalquivir Bank (continental slope of the southwestern Atlantic margin of the Iberian Peninsula), Variscan basement rocks were dredged, as well as, lithified hardground-related carbonate sediments containing Late Tortonian-Early Messinian foraminifers. Basement samples contained graywackes, shales, quartzites, basic volcanics, and metabasites in amphibolite facies. All these sedimentary and volcanic rocks can be attributed to the Volcano-Sedimentary Complex of the Pyrite Belt (South Portuguese Zone of the Iberian Variscan belt). This correlation is based on petrological similarities and the occurrence of low-grade metamorphism in prehnite-pumpellyite facies, identical to those defined in the Pyrite Belt. The metabasites have been correlated with the Beja-Acebuches Ophiolite Complex. These results have led us to consider two problems: the relationship between the Guadalquivir Bank and the South Portuguese Zone and the situation of this bank in the context of the Mesozoic evolution of the continental margin.The outcrop of these rocks on the middle slope of the Portuguese margin implies Variscan fold-and-thrust tectonics of greater intensity for the South Portuguese Zone, and the erosion of the Culm Group in the Guadalquivir Bank area. This erosion is explained by the uplift of the continental side of the transform fault that gave rise to the Mesozoic margin of the Southern Iberian Peninsula. |
| En línea: | https://eprints.ucm.es/id/eprint/28235/1/17-1-2-2004-Art04.pdf |
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