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Geochronology of the El Castillo Volcanic rocks (Salamanca, Central Iberian Zone)

dc.contributor.authorGutiérrez Alonso, Gabriel
dc.contributor.authorMurphy, J. B.
dc.contributor.authorFernández Suárez, J.
dc.contributor.authorHamilton, M.A.
dc.description.abstractExposures of volcanic rocks (El Castillo) in the Central Iberian Zone near Salamanca, Spain, are representative of Paleozoic volcanic activity along the northern Gondwanan passive margin. Alkaline basalts and mafic volcaniclastic rocks of this sequence are structurally preserved in the core of the Variscan Tamames Syncline. On the basis of the occurrence of graptolite fossils in immediately underlying strata, the El Castillo volcanics traditionally have been regarded as Lower Silurian in age. In contrast, most Paleozoic volcanic units in western Iberia are rift-related mafic to felsic rocks emplaced during the Late Cambrian-Early Ordovician, and are attributed to the opening of the Rheic Ocean. We present new zircon U-Pb TIMS data from a mafic volcaniclastic rock within the El Castillo unit. These data yield a near-concordant, upper intercept age of 394.7 ± 1.4 Ma that is interpreted to reflect a Middle Devonian (Emsian-Eifelian) age for the magmatism, demonstrating that the El Castillo volcanic rocks lie unparaconformably above lower Silurian strataen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.subject.otherZona Centribéricaen_US
dc.subject.otherRocas volcánicasen_US
dc.titleGeocronología de las rocas volcánicas de El Castillo (Salamanca, Zona Centroibérica)en_US
dc.titleGeochronology of the El Castillo Volcanic rocks (Salamanca, Central Iberian Zone)eng

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