Universidad de Granada Digibug
 

Repositorio Institucional de la Universidad de Granada >
1.-Investigación >
Departamentos, Grupos de Investigación e Institutos >
Departamento de Mineralogía y Petrología >
DMP - Artículos >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/32070

Title: A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating
Authors: Bea Barredo, Fernando
González Montero, Pilar
Talavera Rodríguez, Cristina
Zinger, Tatiana
Issue Date: 2006
Abstract: The Miranda do Douro orthogneiss was believed to be the oldest magmatic rock of the Central Iberian Zone, on the base of a U-Pb discordia upper intercept of 618 ± 9 Ma. Nevertheless, new ion-microprobe and LA-ICPMS U-Pb zircon dating revealed that the crystallization age was 483 ± 3 Ma. The orthogneiss also contains a 605 ± 13 Ma zircon population that indicates that the source-rock for the Ordovician magma was Pan-African. Moreover, a few ~3.17 Ga zircon grains were also recorded. These grains are the oldest found so far in Iberia, and its occurrence would suggest the involvement of an Archean crust in the Pan-African orogeny.
Sponsorship: This work was financially supported supported by the Spanish DGCYT grant BTE2002-04618-C02-01, the SYNTHESIS grant SE-TAF 528 and the NATO Collaborative Project EST-CLG-978997.
Publisher: Universidad de Barcelona; Instituto de Ciencias de la Tierra Jaume Almera
Keywords: U-Pb dating
Ollo de Sapo
Pre-Variscan
Central Iberian Zone
Gneiss
URI: http://hdl.handle.net/10481/32070
ISSN: 1695-6133
1696-5728
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Bea Barredo, F.; et al. A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating. Geologica Acta, 4(3): 395-401 (2006). [http://hdl.handle.net/10481/32070]
Appears in Collections:DMP - Artículos

Files in This Item:

File Description SizeFormat
BeaBarredo_U-Pb.pdf256.22 kBAdobe PDFView/Open
Recommend this item

This item is licensed under a Creative Commons License
Creative Commons

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! OpenAire compliant DSpace Software Copyright © 2002-2007 MIT and Hewlett-Packard - Feedback

© Universidad de Granada