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The Variscan basement in the western shoulder of the Lusitanian Basin (West Iberian Margin): insights from detrital-zircon geochronology of Jurassic strata

El basamento Varisco en el margen occidental de la Cuenca Lusitana (margen ibérico occidental). Nuevas perspectivas a partir de la geocronología de circones detríticos en estratos jurásicos

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Abstract

There is no consensus about the geological nature of the westernmost portion of the Iberian Massif. In the present research, the detrital zircon U–Pb signatures of Jurassic strata of the Lusitanian Basin, known to be west-sourced, are combined with published U–Pb data for the Precambrian-Palaeozoic basement and other Lusitanian Basin units to better understand this poorly exposed portion of the Iberian Massif. Cryogenian to Ediacaran ages prevail in a northern Upper Jurassic unit, while Lower and Upper Jurassic rocks in southern locations yield mostly Carboniferous to upper Permian zircons. These age results, coupled with their respective U/Th ratios, suggest that the basin covers two distinct terranes of the Iberian Massif. Another noteworthy feature of west-derived deposits is the abundance of < 310 Ma ages. It is proposed that a combination of crustal thinning in the West Iberian Margin with regional eastward basement tilt, favoured the enrichment of relatively young zircon in the western shoulder of the basin relative to its eastern margin. The detrital zircon age signatures also reveal a middle to late Permian thermal event in restricted areas, which is probably associated with the oldest stages of Alpine extension in West Iberia.

Resumen

Actualmente no existe consenso sobre la naturaleza geológica de la zona más occidental del Macizo Ibérico. En la presente investigación se ha llevado a cabo un análisis de la relación entre la signatura U-Pb de circones detríticos obtenidos en estratos jurásicos de la Cuenca Lusitana, provenientes del oeste, con datos de U-Pb publicados sobre el basamento Precámbrico-Paleozoico y otras formaciones de la Cuenca Lusitana, para comprender mejor esta zona poco expuesta del Macizo Ibérico. Las edades criogénicas y ediacarienses dominan en la parte norte de las unidades del Jurásico superior, mientras que en la parte sur dominan los circones de edades carboníferas y del Pérmico superior, tanto en las unidades del Jurásico inferior como en las del superior. Estos resultados geocronológicos junto con sus respectivas relaciones U/Th, sugieren que la cuenca cubre dos terrenos distintos del Macizo Ibérico. Otra característica notable de los depósitos procedentes del oeste es la abundancia de edades <310 Ma. Se propone que una combinación de adelgazamiento de la corteza en el Margen Ibérico Occidental junto con la inclinación regional del basamento hacia el este, favoreció el enriquecimiento de circones relativamente jóvenes en el flanco occidental de la cuenca en relación con su margen oriental. Las signaturas de edad del circón detrítico también revelan un evento térmico del Pérmico medio al tardío en áreas restringidas que probablemente esté asociado con las etapas más antiguas de extensión alpina en el oeste de Iberia.

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Acknowledgements

The research was supported by national funds through FCT—Foundation for Science and Technology, I.P., within the scope of the project UIDB/04292/2020 (MARE). Two anonymous reviewers are acknowledged for their constructive comments and suggestions that helped to improve the article.

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  1. Department of Earth Sciences, University of Coimbra, Marine and Environmental Sciences Centre (MARE), Rua Sílvio Lima, 3030-790, Coimbra, Portugal

    Pedro A. Dinis, Luís V. Duarte & Pedro Proença Cunha

  2. London Geochronology Centre, Department of Earth Sciences, University College London, London, WC1E 6BT, UK

    Pieter Vermeesch

  3. Laboratory for Provenance Studies, Department of Earth and Environmental Sciences, University of Milano-Bicocca, 20126, Milano, Italy

    Marta Barbarano & Eduardo Garzanti

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  1. Pedro A. Dinis
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Dinis, P.A., Vermeesch, P., Duarte, L.V. et al. The Variscan basement in the western shoulder of the Lusitanian Basin (West Iberian Margin): insights from detrital-zircon geochronology of Jurassic strata. J Iber Geol 47, 685–696 (2021). https://doi.org/10.1007/s41513-021-00177-w

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