Liesa Torre Marín, Montserrat and Carreras, Jordi and Castiñeiras García, Pedro and Casas Tuset, Josep María and Navidad Fernández de la Cruz, Marina and Vilà i Pranella, Miquel (2011) U-Pb zircon age of Ordovician magmatism in the Albera Massif (Eastern Pyrenees). Geologica acta, 9 (1). pp. 93-101. ISSN 1695-6133
Official URL: http://www.geologica-acta.com
New geochronological data from the Albera Massif confirm the presence of an Early – Mid Ordovician igneous event (472 - 465Ma) recorded in the pre-Variscan rocks of the Pyrenees. This event resulted in the emplacement of a large granitic body in the lower part of the pre-Upper Ordovician metasedimentary succession and in the intrusion of a series of metric sized dykes in the middle and upper parts of it. The two types of igneous rocks were gneissified during subsequent Variscan deformation. The geochronological data confirm the occurrence of the gneiss as having derived from an Ordovician intrusive sheet, as in other Pyrenean massifs. The dykes are considered to be the subvolcanic equivalent of the intrusive sheet. The data also provide insight into the age of the metasedimentary series of the massif and enable us to correlate the dated rocks with other gneissic and subvolcanic bodies of the Variscan massifs of the Pyrenees and Iberia.
|Uncontrolled Keywords:||Pre-Variscan, Early-Mid Ordovician magmatism, SHRIMP geochronology, U-Pb zircon dating, Eastern Pyrenees|
|Subjects:||Sciences > Geology > Petrology|
|Deposited On:||07 Dec 2011 11:36|
|Last Modified:||07 Dec 2011 11:36|
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