A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating

Geologica Acta

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Title A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating
 
Creator BEA, F.
MONTERO, P.
TALAVERA, C.
ZINGER, T.
 
Subject U-Pb dating; Ollo de Sapo; Pre-Variscan; Central Iberian Zone; Gneiss.
 
Description 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.
 
Publisher Geologica Acta
Geologica Acta
Geologica Acta
 
Contributor
 
Date 2006-01-12
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
 
Identifier https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000353
10.1344/105.000000353
 
Source Geologica Acta; Vol 4, No 3; 395-402
Geologica Acta; Vol 4, No 3; 395-402
Geologica Acta; Vol 4, No 3; 395-402
1696-5728
1695-6133
 
Language eng
 
Relation https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000353/4211
 
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