A REVISED ORDOVICIAN AGE FOR THE MIRANDA DO DOURO ORTHOGNEISS, PORTUGAL. ZIRCON U-PB ION-MICROPROBE AND LA-ICPMS DATING

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dc.contributor.author Bea F.
dc.contributor.author Montero P.
dc.contributor.author Talavera C.
dc.contributor.author Zinger T.
dc.date.accessioned 2024-12-15T02:15:16Z
dc.date.available 2024-12-15T02:15:16Z
dc.date.issued 2006
dc.identifier https://www.elibrary.ru/item.asp?id=13506630
dc.identifier.citation Geologica Acta, 2006, 4, 3, 395-401
dc.identifier.issn 1695-6133
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/46986
dc.description.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. © UB-ICTJA.
dc.subject CENTRAL IBERIAN ZONE
dc.subject GNEISS
dc.subject OLLO DE SAPO
dc.subject PRE-VARISCAN
dc.subject U-PB DATING
dc.subject Archean
dc.subject Ordovician
dc.title A REVISED ORDOVICIAN AGE FOR THE MIRANDA DO DOURO ORTHOGNEISS, PORTUGAL. ZIRCON U-PB ION-MICROPROBE AND LA-ICPMS DATING
dc.type Статья
dc.subject.age Precambrian::Archean
dc.subject.age Докембрий::Архей
dc.subject.age Paleozoic::Ordovician
dc.subject.age Палеозой::Ордовикская


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