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40 Ma of hydrothermal W mineralization during the Variscan orogenic evolution of the French Massif Central revealed by U-Pb dating of wolframite

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An Erratum to this article was published on 13 May 2017

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Abstract

We present U-Pb thermal ionization mass spectrometer (TIMS) ages of wolframite from several granite-related hydrothermal W±Sn deposits in the French Massif Central (FMC) located in the internal zone of the Variscan belt. The studied wolframite samples are characterized by variable U and Pb contents (typically <10 ppm) and show significant variations in their radiogenic Pb isotopic compositions. The obtained U-Pb ages define three distinct geochronological groups related to three contrasting geodynamic settings: (i) Visean to Namurian mineralization (333–327 Ma) coeval with syn-orogenic compression and emplacement of large peraluminous leucogranites (ca. 335–325 Ma), (ii) Namurian to Westphalian mineralization (317–315 Ma) synchronous with the onset of late-orogenic extension and emplacement of syn-tectonic granites (ca. 315–310 Ma) and (iii) Stephanian to Permian mineralization (298–274 Ma) formed during post-orogenic extension contemporaneous with the Permian volcanism in the entire Variscan belt. The youngest ages (276–274 Ma) likely reflect the reopening of the U-Pb isotopic system after wolframite crystallization and may correspond to late hydrothermal alteration (e.g. ferberitization). Our results demonstrate that W(±Sn) mineralization in the FMC formed during at least three distinct hydrothermal events in different tectono-metamorphic settings over a time range of 40 Ma.

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  • 13 May 2017

    An erratum to this article has been published.

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Acknowledgements

This work was supported by the French National Research Agency through the national program “Investissements d’avenir” of the Labex Ressources 21 with the reference ANR-10-LABX-21-RESSOURCES21 and has also taken part of the project ERAMIN “New Ores”. The authors would like to thank Dr. Michel Cathelineau, Dr. Bernard Mouthier, Dr. Hossein Ahmadzadeh and the Musée Minéralogique de l’Ecole des Mines d’Alès (France) for supplying some of the wolframite samples. We would like also to thank Sandrine Mathieu, Dr. Andreï Lecomte and Dr. Chantal Peiffert (GeoRessources, Vandœuvre-lès-Nancy, France) for technical support in providing analytical data with SEM and LA-ICPMS analyses. We thank an anonymous reviewer and editor Bernd Lehmann for constructive comments that helped to focus the manuscript.

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  1. Matthieu Harlaux

    Present address: Department of Earth Sciences, University of Geneva, 1205, Geneva, Switzerland

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  1. Université de Lorraine, CNRS, CREGU, GeoRessources, 54506, Vandœuvre-lès-Nancy, France

    Matthieu Harlaux, Julien Mercadier, Christophe Morlot, Christian Marignac & Michel Cuney

  2. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473, Potsdam, Germany

    Rolf L. Romer

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Editorial handling: B. Lehmann

The original version of this article has been revised: the article title was incorrectly published and now corrected above. Also, the notes below the tables should read “bold-italics” not “bloc-italics”.

An erratum to this article is available at https://doi.org/10.1007/s00126-017-0742-8.

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Fig. S1

Typical LA-ICPMS spectra of wolframite (Wolf). a Homogeneous wolframite in BSE imagery showing intra-crystalline variations of U content (sample CFM-16). b Wolframite containing a micro-inclusion of ferberite (Fbr), hardly visible on SEM image (see zoomed image in inset in the right corner) (sample BOS3c). Ablation lines are 500 μm long and were realised with a constant laser spot diameter of 120 μm, a speed of 2 μm/s and a repetition rate of 10 Hz (see text for details). Bg background. (JPEG 401 kb)

High resolution (EPS 6479 kb)

Fig. S2

Typical LA-ICPMS spectra of ferberite (Fbr) and scheelite (Scl) associated with wolframite (Wolf). (a) Homogeneous wolframite in BSE imagery, partially replaced by ferberite (b) along crystalline borders (sample BOS3c). (c) Homogeneous wolframite hosting inclusions of scheelite (d) in replacement (sample ML-1). Single-spot laser analysis using 60 μm spot diameter and 10 Hz repetition rate (see text for details). Bg background. (JPEG 711 kb)

High resolution (EPS 6376 kb)

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Harlaux, M., Romer, R.L., Mercadier, J. et al. 40 Ma of hydrothermal W mineralization during the Variscan orogenic evolution of the French Massif Central revealed by U-Pb dating of wolframite. Miner Deposita 53, 21–51 (2018). https://doi.org/10.1007/s00126-017-0721-0

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