Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/127772
Title: | U-Pb geochronology on zircon and columbite-group minerals of the Cap de Creus pegmatites, NE Spain |
Author: | Van Lichtervelde, M. Grand'Homme, A. de Saint-Blanquat, M. Olivier, Ph. Gerdes, Axel Paquette, J.-L. Melgarejo i Draper, Joan-Carles Druguet, Elena Alfonso Abella, María Pura |
Keywords: | Geocronologia Geoquímica Pegmatites Geochronology Geochemistry Pegmatites |
Issue Date: | Feb-2017 |
Publisher: | Springer Verlag |
Abstract: | 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. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1007/s00710-016-0455-1 |
It is part of: | Mineralogy and Petrology, 2017, vol. 111, num. 1, p. 1-21 |
URI: | http://hdl.handle.net/2445/127772 |
Related resource: | https://doi.org/10.1007/s00710-016-0455-1 |
ISSN: | 0930-0708 |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
668690.pdf | 1.77 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.