Resultats globals: 2 registres trobats en 0.02 segons.
Articles, 2 registres trobats
Articles 2 registres trobats  
1.
7 p, 265.0 KB A revised Ordovician age for the Miranda do Douro orthogneiss, Portugal. Zircon U-Pb ion-microprobe and LA-ICPMS dating / Bea, Fernando (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Mntero, P. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Talavera, C. (Universidad de Granada. Departamento de Mineralogía y Petrología) ; Zinger, T. (Russian Academy of Sciences. Institute of Precambrian Geology and Geochronology)
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. [...]
2006 - 10.1344/105.000000353
Geologica acta, Vol. 4, Núm. 3 (2006) , p. 395-401  
2.
9 p, 1.5 MB U-Pb zircon age of Ordovician magmatism in the Albera Massif (Eastern Pyrenees) / Liesa Torre-Marín, Montserrat (Universitat de Barcelona. Facultat de Geologia) ; Carreras, J. (Universitat Autònoma de Barcelona. Departament de Geologia) ; Castiñeiras, P. (Universidad Complutense de Madrid. Departamento de Petrología y Geoquímica) ; Casas Tuset, Josep Maria (Universitat de Barcelona. Departament de Geodinàmica i Geofísica) ; Navidad, M. (Universidad Complutense de Madrid. Departamento de Petrología y Geoquímica) ; Vilà, M. (Institut Geològic de Catalunya)
New geochronological data from the Albera Massif confirm the presence of an Early - Mid Ordovician igneous event (472 - 465Ma) recorded in the pre-Variscan rocks of the Pyrenees. This event resulted in the emplacement of a large granitic body in the lower part of the pre-Upper Ordovician metasedimentary succession and in the intrusion of a series of metric sized dykes in the middle and upper parts of it. [...]
2011 - 10.1344/105.000001651
Geologica acta, Vol. 9, Núm. 1 (Març 2011) , p. 93-101  

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