%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Van Lichtervelde, Marieke
%A Grand'Homme, A.
%A de Saint-Blanquat, M.
%A Olivier, P.
%A Gerdes, A.
%A Paquette, J. L.
%A Melgarejo, J.
%A Druguet, E.
%A Alfonso, P.
%T U-Pb geochronology on zircon and columbite-group minerals of the Cap de Creus pegmatites, NE Spain
%D 2017
%L fdi:010068905
%G ENG
%J Mineralogy and Petrology
%@ 0930-0708
%K Geochronology ; Pegmatites ; Cap deCreus ; Zircon ; Columbite-group minerals
%K ESPAGNE
%M ISI:000392518900001
%N 1
%P 1-21
%R 10.1007/s00710-016-0455-1
%U https://www.documentation.ird.fr/hor/fdi:010068905
%> https://www.documentation.ird.fr/intranet/publi/2017/02/010068905.pdf
%V 111
%W Horizon (IRD)
%X The Cap de Creus granitic pegmatites in the eastern Catalan Pyrenees were dated using in situ U-Pb geochronology by laser ablation ICP-MS on zircon and columbite-group minerals (CGM), which are present in the different types of pegmatites from type I (K-feldspar pegmatites, least evolved) to type IV (albite pegmatites, most evolved) and therefore allow dating the different pegmatitic pulses. In a type III pegmatite where zircon and CGM are co-genetically associated in the same sample, both minerals were dated using zircon and tantalite reference materials, respectively, to avoid laser-induced matrix-dependent fractionation. In one sample, xenotime genetically associated with zircon was also dated. Two ages were obtained for type I and three ages for type III pegmatites. Three of these 5 ages range from 296.2 +/- 2.5 to 301.9 +/- 3.8 Ma and are allocated to the primary magmatic stage of crystallization and therefore to the emplacement event. Two younger ages (290.5 +/- 2.5 and 292.9 +/- 2.9 Ma) obtained on secondary zircon and xenotime, respectively, are interpreted as late post-solidus hydrothermal remobilization. There is no age difference between type I and type III pegmatites. The mean 299 Ma primary magmatic age allows the main late Carboniferous deformation event to be dated and is also synchronous with other peraluminous and calc-alkaline granites in the Pyrenees. However, the youngest ages around 292 Ma imply that tectonics was still active in Early Permian times in the Cap de Creus area.
%$ 064