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U–Pb isotopic ages and Hf isotope composition of zircons in Variscan gabbros from central Spain: evidence of variable crustal contamination

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Abstract

Ion microprobe U–Pb analyses of zircons from three gabbroic intrusions from the Spanish Central System (SCS) (Talavera, La Solanilla and Navahermosa) yield Variscan ages (300 to 305 Ma) in agreement with recent studies. Only two zircon crystals from La Solanilla massif gave slightly discordant Paleoproterozoic ages (1,848 and 2,010 Ma). Hf isotope data show a relatively large variation with the juvenile end-members showing ɛHfi values as high as +3.6 to +6.9 and +1.5 to +2.9 in the Navahermosa and Talavera gabbros, respectively. These positive ɛHfi values up to +6.9 might represent the composition of the subcontinental mantle which generates these SCS gabbros. This ɛHfi range is clearly below depleted mantle values suggesting the involvement of enriched mantle components on the origin of these Variscan gabbros, and is consistent with previous whole-rock studies. The presence of zircons with negative ɛHfi values suggest variable, but significant, crustal contamination of the gabbros, mainly by mixing with coeval granite magmas. Inherited Paleoproterozoic zircons of La Solanilla gabbros have similar trace element composition (e.g. Th/U ratios), but more evolved Hf-isotope signatures than associated Variscan zircons. Similar inherited ages have been recorded in zircons from coeval Variscan granitoids from the Central Iberian Zone. Granitic rocks have Nd model ages (TDM) predominantly in the range of 1.4 to 1.6 Ga, suggesting a juvenile addition during the Proterozoic. However, Hf crustal model ages of xenocrystic Proterozoic zircons in La Solanilla gabbro indicate the presence of reworked Archean protoliths (TDM2 model ages of 3.0 to 3.2 Ga) incorporated into the hybridized mafic magma.

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Acknowledgments

We acknowledge Alfredo Fernández Larios and José González del Tánago for their assistance with the electron microprobe analyses in the CAI of Microscopía Electrónica (Complutense University of Madrid). We are also grateful to Norman Pearson and Rosanna Murphy for their help while performing Hf isotope analyses. We also thank Rosanna Murphy for improving the English. Editorial handling by Johann G. Raith and suggestions made by two anonymous reviewers have greatly increased the quality of the final version of the manuscript. This work is included in the objectives of, and supported by, the CGL2008-05952 project of the Ministerio de Ciencia y Tecnología of Spain and the GR58/08-910492-UCM project.

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  1. Departamento de Petrología y Geoquímica-Instituto de Geología Económica. Centro mixto UCM-CSIC, Complutense University of Madrid, 28040, Madrid, Spain

    Carlos Villaseca, David Orejana & Cecilia Pérez-Soba

  2. GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, 2109, Australia

    Elena Belousova

  3. Research School of Earth Sciences, Australian National University, Canberra, Australia

    Richard A. Armstrong

  4. Department of Mineralogy, Natural History Museum, London, SW7 5BD, UK

    Teresa E. Jeffries

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Villaseca, C., Orejana, D., Belousova, E. et al. U–Pb isotopic ages and Hf isotope composition of zircons in Variscan gabbros from central Spain: evidence of variable crustal contamination. Miner Petrol 101, 151–167 (2011). https://doi.org/10.1007/s00710-010-0142-6

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