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

1. Montero, P.
2. Bea Barredo, Fernando
3. Talavera, C.
4. Zinger, T.

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Otras publicaciones en: Geologica acta: an international earth science journal

Resumen

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.

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