@misc{10481/32070,
year = {2006},
url = {http://hdl.handle.net/10481/32070},
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.},
organization = {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},
keywords = {Ollo de Sapo},
keywords = {Pre-Variscan},
keywords = {Central Iberian Zone},
keywords = {Gneiss},
title = {A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating},
author = {Bea Barredo, Fernando and González Montero, Pilar and Talavera Rodríguez, Cristina and Zinger, Tatiana},
}