Cartografía, petrografía y geoquímica del stock de Medina de las Torres (Complejo plutónico de Valencia del Ventoso, Badajoz)

• Autores: Fernando Sarrionandia-Ibarra Eguidazu, Manuel Carracedo Sánchez, Luis Eguiluz Alarcón, Teodoro Palacios Medrano
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 1, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 113-116
• Idioma: español
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• Resumen

  • The Medina de las Torres stock (SMT) represents the north edge of the Valencia del Ventoso plutonio complex, and intrudes in the Lower Cambrian materials of the Olivenza-Monesterio antiform. The south part of this stock is intruded by the Valencia del Ventoso pluton and by a dyke complex, without any genetic relationships with this stock. The SMT is formed by massive and banded gabbros, and by three massive quartzmonzodioritic facies: piroxenic, fine grained and coarse grained. All these facies show gradual contacts. These rocks are meta-aluminous, sub-alkaline and high-K calk-alkaline, and define a magnesian cafemic association, intermediate between calk-alkaline and sub-alkaline (monzonitic) associations. The absence of deformation and the disappearance of all Hercynian structuration in the exocontact of this stock, indicate that this magmatism is late-Hercynian. Its high-K calk-alkaline chemistry is typical of magmas related with postcollisional environments.