U-Pb geochronology on zircon and columbite-group minerals of the Cap de Creus pegmatites, NE Spain

被引:28
|
作者
Van Lichtervelde, Marieke [1 ]
Grand'Homme, Alexis [2 ]
de Saint-Blanquat, Michel [1 ]
Olivier, Philippe [1 ]
Gerdes, Axel [3 ]
Paquette, Jean-Louis [4 ]
Carles Melgarejo, Joan [5 ]
Druguet, Elena [6 ]
Alfonso, Pura [7 ]
机构
[1] Univ Toulouse, Geosci Environm Toulouse, CNES, CNRS,IRD,UPS, 14 Ave Edouard Belin, F-31400 Toulouse, France
[2] Univ Grenoble, ISTerre, 1381 Rue Piscine,BP 53, F-38041 Grenoble, France
[3] Goethe Univ Frankfurt, Dept Geosci Petrol & Geochem, Altenhoeferallee 1, D-60438 Frankfurt, Germany
[4] Univ Blaise Pascal, UMR 6524, Lab Magmas & Volcans, Clermont Univ,CNRS,IRD, BP 10448, F-63000 Clermont Ferrand, France
[5] Univ Barcelona, Dept Cristallog Mineral & Diposits Minerals, C Marti & Franques S-N, E-08028 Barcelona, Catalonia, Spain
[6] Univ Autonoma Barcelona, Dept Geol, E-08193 Barcelona, Catalonia, Spain
[7] Escola Politecn Super Engn Manresa UPC, Dept Engn Minera & Recursos Nat, Avinguda Bases Manresa 61-73, Manresa 08240, Spain
关键词
Geochronology; Pegmatites; Cap deCreus; Zircon; Columbite-group minerals; RARE-ELEMENT PEGMATITES; EASTERN PYRENEES; ICP-MS; ORDOVICIAN MAGMATISM; GRANITIC PEGMATITES; BEARING PEGMATITES; DETRITAL ZIRCONS; MONTAGNE NOIRE; GATUMBA AREA; SHEAR ZONES;
D O I
10.1007/s00710-016-0455-1
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
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.
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页码:1 / 21
页数:21
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