Caracterización geológica de los afloramientos de El Pimpollar, extremo nororiental de la Zona Surportuguesa

• Autores: Alejandro Díez Montes
• Localización: Geogaceta, ISSN 0213-683X, Nº. 40, 2006, págs. 123-126
• Idioma: español
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• Resumen

  • Two volcanic units can be distinguished in the �El Pimpollar� outcrop (eastern South-Portuguese Zone). The Lower Unit is composed mainly of submarine dacites and andesites, with some subordinated basalts and trachyandesites. The Upper Unit is composed of massive rhyolites, with volcano-sedimentary and volcanoclastic deposits towards the base.

    Radiolaritic sediments interbeded with the andesites and dacites show that these volcanic rocks extruded in a relatively deep marine basin.

    The upper part and top of the Lower Volcanit Unit includes some diamictic layers related with mass-transport processes. Some of these diamictic layers contain limestone pebbles and blocks with middle Visean microfossils. These sedimentary deposits mark possibly the beginning of a tectonic event that was responsible for the destruction of a carbonate platform, and for severe changes in the tecto-sedimentary environment.