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A U–Pb zircon age (479 ± 5 Ma) from the uppermost layers of the Ollo de Sapo Formation near Viveiro (NW Spain): implications for the duration of rifting-related Cambro-Ordovician volcanism in Iberia

Published online by Cambridge University Press:  15 August 2014

M.A. LOPEZ-SANCHEZ ,
A. IRIONDO ,
A. MARCOS  and
F.J. MARTÍNEZ
M.A. LOPEZ-SANCHEZ*
Affiliation:
Departamento de Geología, Universidad de Oviedo, C/Jesús Arias de Velasco s/n, 33005 Oviedo, Spain
A. IRIONDO
Affiliation:
Centro de Geociencias, Universidad Nacional Autónoma de México, Querétaro 76230, México
A. MARCOS
Affiliation:
Departamento de Geología, Universidad de Oviedo, C/Jesús Arias de Velasco s/n, 33005 Oviedo, Spain
F.J. MARTÍNEZ
Affiliation:
Departamento de Geología, Universidad Autónoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
*
†Author for correspondence: malopez@geol.uniovi.es
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Abstract

The uppermost metavolcanic layer of the Cambro-Ordovician Ollo de Sapo Formation, the largest accumulation of pre-Variscan igneous rocks in the Iberian Peninsula, have been dated in its northernmost part using U–Pb SHRIMP-RG zircon age techniques at 479.0 ± 4.7 Ma. The age obtained is the youngest age found so far in the metavolcanic facies of Ollo de Sapo Formation and represents the cessation of the rifting-related Cambro-Ordovician Ollo de Sapo volcanism at the northernmost tip of the Iberian Peninsula. Our results show that the Cambro-Ordovician volcanism in the NW of the Iberian Peninsula is not as short-lived as previously thought and confirm the correlation between the Cambro-Ordovician volcanic sequences that crop out in the Central Iberian Zone and the French Southern Armorican Massif. Finally, our study suggests that the cessation of the Cambro-Ordovician volcanism along the Ibero-Armorican Arc was synchronic or, less probably, slightly diachronic with younger ages towards the north (in present-day geographical coordinates).

Keywords

Cambro-Ordovician volcanismOllo de Sapo FormationIberian Massifnorthern Gondwana break-upU–Pb SHRIMP-RG zircon dating
Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 2 , March 2015 , pp. 341 - 350
Copyright
Copyright © Cambridge University Press 2014 

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