Mineralium Deposita

, Volume 50, Issue 4, pp 455–463 | Cite as

Evidence for an Early Cretaceous mineralizing event above the basement/sediment unconformity in the intracratonic Paris Basin: paragenetic sequence and Sm-Nd dating of the world-class Pierre-Perthuis stratabound fluorite deposit

  • Morgane Gigoux
  • Guillaume Delpech
  • Catherine Guerrot
  • Maurice Pagel
  • Thierry Augé
  • Philippe Négrel
  • Benjamin Brigaud


World-class stratabound fluorite deposits are spatially associated with the basement/sediment unconformity of the intracratonic Paris Basin and the Morvan Massif in Burgundy (France). The reserves are estimated to be about 5.5 Mt of fluorite within six fluorite deposits. In this study, we aim to determine the age of the major fluorite mineralization event of the Pierre-Perthuis deposit (1.4 Mt fluorite) by a combined study of the paragenetic mineral sequence and Sm-Nd dating on fluorite crystals. Fluorite occurs as isolated cubes or filling geodes in a Triassic, silicified, dolomitic formation. Three fluorite stages associated with sphalerite, pyrite, galena, barite, and quartz have been distinguished using optical, cathodoluminescence, and scanning electron microscopes. Seven crystals of the geodic fluorite stage were analyzed for their rare earth element (REE) contents and their 147Sm/144Nd and 143Nd/144Nd isotopic compositions. The normalized REE distribution displays homogeneous bell-shaped patterns for all the geodic fluorite samples with a Mid-REE enrichment over the Light-REE and Heavy-REE. The 147Sm/144Nd varies from 0.3108 to 0.5504 and the 143Nd/144Nd from 0.512313 to 0.512518. A six-point Sm-Nd isochron defines an age of 130 ± 15 Ma (initial 143Nd/144Nd = 0.512054, MSWD = 0.21). This Sm-Nd isochron provides the first age for the stratabound fluorite sediment-hosted deposit, related to an unconformity in the Paris Basin, and highlights a major Early Cretaceous fluid circulation event mainly above the basement/sediment unconformity during a flexural deformation of the Paris Basin, which relates to the rifting of the Bay of Biscay and the formation of the Ligurian Sea in the Western Europe domain.


Stratabound fluorite deposits Paragenesis Sm-Nd dating Paris Basin Morvan Pierre-Perthuis 



This study is part of a collaborative project between the BRGM and the University Paris-Sud. This study was supported by a BRGM PhD grant for the first author and was funded in part by the CNRS-INSU “Connaissance et Technologie du Sous-Sol pour son Exploitation et Usage Durable” (CESSUR) research program. We thank Louise Bordier, Eric Douville, Anne-Marie Gallas, and Alexandre Vrain for their assistance with the chemical analyses, Rémy Pichon and Sophie Decrée for assistance with SEM observations, and Valérie Godard and Philippe Blanc (Lithologie Bourgogne) for their high-quality thin sections. We are grateful to Yassine Daoud, Georges Gand, Jocelyn Barbarand, Setareh Rad, and Philippe Chevremont for helpful discussions and their involvement in this project. F. Henjes-Kunst, F. Melcher, and G. Beaudoin are acknowledged for their constructive comments and editorial handling.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Morgane Gigoux
    • 1
    • 2
  • Guillaume Delpech
    • 1
  • Catherine Guerrot
    • 2
  • Maurice Pagel
    • 1
  • Thierry Augé
    • 2
  • Philippe Négrel
    • 2
  • Benjamin Brigaud
    • 1
  1. 1.Université Paris-Sud, UMR CNRS/UPS Géosciences Paris Sud (GEOPS)OrsayFrance
  2. 2.BRGMOrléans Cedex 2France

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