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Petrogenesis of Permian alkaline lamprophyres and diabases from the Spanish Central System and their geodynamic context within western Europe

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Abstract

Basic to ultrabasic alkaline lamprophyres and diabases intruded within the Spanish Central System (SCS) during Upper Permian. Their high LREE, LILE and HFSE contents, together with positive Nb–Ta anomalies, link their origin with the infiltration of sublithospheric K-rich fluids. These alkaline dykes may be classified in two distinct groups according to the Sr–Nd isotope ratios: (1) a depleted PREMA-like asthenospheric component, and (2) a BSE-like lithospheric component. A slight enrichment in radiogenic 207Pb and 208Pb allows the contribution of a recycled crustal or lithospheric component in the mantle sources. The intrusion of this alkaline magmatism is likely to have occurred due to adiabatic decompression and mantle upwelling in the context of the widespread rifting developed from Carboniferous to Permian in western Europe. The clear differences in the geochemical affinity of Lower Permian basic magmas from north-western and south-western Europe might be interpreted in terms of a more extensive separation of both regions during that period, until they were assembled during Upper Permian.

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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 (UCM). We also thank Rex Taylor and Tyna Hayes from the Southampton Oceanography centre, for their help in analysing samples by TIMS. The Access to Research Infrastructure action of the Improving Human Potential Programme, supported by the European Community, has let us carry out the laser mineral analyses at the University of Bristol, the Pb isotope analyses at the Swedish Museum of Natural History and part of the Sr–Nd isotope analyses at the National Oceanography Centre of Southampton. This work is included in the objectives of, and supported by, the CGL2004-02515 project of the Ministerio de Educación y Ciencia of Spain.

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  1. Department of Petrology and Geochemistry, Complutense University of Madrid, 28040, Madrid, Spain

    D. Orejana & C. Villaseca

  2. Museum of Natural History, Stockholm, Sweden

    K. Billström

  3. Department of Earth Sciences, University of Bristol, BS8 1RJ, Bristol, UK

    B. A. Paterson

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  1. D. Orejana
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Communicated by J. Hoefs.

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(TIF 8993 kb)

e-Table 1. Trace element composititon of external standards used for whole rock and LA-ICP-MS analyses (XLS 22 kb)

e-Table 2. Major element composition of clinopyroxenes from the SCS alkaline lamprophyres and diabases (XLS 80 kb)

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eTable 3. Trace element composition of clinopyroxene, amphibole and phlogopite phenocrysts from SCS alkaline lamprophyres and diabases (XLS 23 kb)

e-Table 4. Major element composition of amphibole from SCS alkaline lamprophyres and diabases (XLS 39 kb)

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e-Table 5. Major element composition of spinel group minerals, ilmenite, apatite and olivine from SCS alkaline lamprophyres and diabases (XLS 46 kb)

e-Table 6. Major element composition of micas from SCS alkaline lamprophyres and diabases (XLS 29 kb)

e-Table 7. Major element composition of feldspar from SCS alkaline lamprophyres and diabases (XLS 41 kb)

(TIF 11189 kb)

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Orejana, D., Villaseca, C., Billström, K. et al. Petrogenesis of Permian alkaline lamprophyres and diabases from the Spanish Central System and their geodynamic context within western Europe. Contrib Mineral Petrol 156, 477–500 (2008). https://doi.org/10.1007/s00410-008-0297-x

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