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Hydrothermal activity during tectonic building of the Variscan orogen recorded by U-Pb systematics of xenotime in the Grès Armoricain formation, Massif Armoricain, France

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Abstract

In the Saint-Aubin-des-Châteaux deposit (Massif Armoricain, France), the Ordovician Grès Armoricain sandstones have undergone several fluid-rock interaction events, including diagenetic cementation and orogenic base metal-As-Sb-Au mineralisation. Ironstone layers interbedded in the sandstones contain several generations of spectacular authigenic xenotime overgrowths that formed around detrital zircon grains in response to successive hydrothermal events. Textural and chemical characterisations allow to distinguish three generations of xenotime overgrowths, differing notably in their REE characteristics. In-situ U-Pb data obtained on these xenotime overgrowths show that their U-Pb systematics were largely disturbed by successive hydrothermal events over about 90 Ma between ~ 330 and ~ 420 Ma, a time interval encompassing most phases of the construction of the Variscan orogen in France. The younger dates cluster around ~ 330–340 Ma and likely correspond to the age of the deposition of massive sulphides and base-metals in the Saint-Aubin-des-Châteaux deposits, which is consistent with the structural contexts where they formed. Finally, this study shows that similarly to monazite, another phosphate widely used for U-Pb and Th-Pb dating studies, the U-Pb chronometric system in xenotime appears to be highly sensitive to fluid circulations.

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Acknowledgments

We want to thank the Hervé Granulats Company, and more particularly their quarry manager Bruno Geibig, for facilitating our access to the Saint-Aubin-des-Châteaux quarry. We are also grateful to Olivier Pourret for access to the Secondary Electron Microscope at the LaSalle Institute (Beauvais, France). Franz Kiraly (University of Vienna) is thanked for assistance with microprobe analyses and technical support. The analytical work at the University of Bergen was supported by GACR project P210/12/2114. Finally, we thank Ian Fletcher and an anonymous reviewer for his corrections and suggestions which have substantially improved the manuscript.

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Authors and Affiliations

  1. Planetary and Space Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, U K

    Romain Tartèse

  2. UMR CNRS 6118 Géosciences Rennes, OSUR, Université de Rennes 1, 35042, Rennes Cedex, France

    Marc Poujol & Philippe Boulvais

  3. BRGM, Institut des Sciences de la Terre d’Orléans, UMR CNRS 7327, Orléans, France

    Eric Gloaguen

  4. Fachbereich Geowissenschaften, AG Isotopengeochemie, Eberhard Karls Universität Tübingen, Wilhelmstr. 56, 72074, Tübingen, Germany

    Kerstin Drost

  5. Department of Earth Science and Centre for Geobiology, University of Bergen, Allégaten 41, 5007, Bergen, Norway

    Kerstin Drost & Jan Košler

  6. Czech Geological Survey, Klarov 3, Prague 1, Czech Republic

    Jan Košler

  7. Department of Lithospheric Research, University of Vienna, Althanstr. 14, 1090, Wien, Austria

    Theodoros Ntaflos

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  1. Romain Tartèse
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Correspondence to Romain Tartèse.

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Editorial handling: Y. Xu

This paper is dedicated to the memory of Jan Košler.

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Tartèse, R., Poujol, M., Gloaguen, E. et al. Hydrothermal activity during tectonic building of the Variscan orogen recorded by U-Pb systematics of xenotime in the Grès Armoricain formation, Massif Armoricain, France. Miner Petrol 109, 485–500 (2015). https://doi.org/10.1007/s00710-015-0373-7

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