Topaz solid solution in the F-rich granitic rocks from Blond (NW Massif Central, France)

  • Mohamed SoufiEmail author
  • Toufik Remmal
  • Iz Eddine EL Amrani El Hassani
  • Samira Makhoukhi
Original Paper


The Blond peraluminous leucogranitic stock, which is a part of the Limousin in Massif Central of France, ranges in composition from two micas leucogranite to topaz–albite leucogranite which are associated to topaz microgranitic dyke (ongonite). The topaz-bearing granitic rocks recognized in this area appear as minor and late components of the massif. Analysis of topaz features within this facies allows the setting of a typological classification based upon the relationships between habits, chemical composition, and the genesis conditions of this mineral. The primary, magmatic nature of topaz has been inferred by microtextural investigations, whereas electron microprobe analyses indicate that topaz lies entirely within the space defined by natural F-OH topaz solid solution series at moderate pressures. The F-content ranges from 14.39 to 20.14 wt.% and OH/OH + F ratio ranges from 0.04 to 0.31. Two separate generations of magmatic topaz, including an early-stage medium-F topaz and a late-stage high-F topaz, are shown. These characteristics could be related to high HF concentration in the melt, while the effect of temperature on the F-content of topaz as it was demonstrated experimentally can be reviewed.


Blond granitic stock Massif Central of France Hercynian belt Topaz-bearing granitic rocks Topaz 



We would like to thank Eric H Christiansen, Louis Raimbault and an anonymous reviewer for their constructive comments and suggestions which substantially helped improving the quality of this paper. The authors are grateful to everyone who has provided valuable assistance on the electronic microprobe at the French Geological Survey (BRGM), Orleans, and the Henri Poincaré University, Nancy, France.


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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Mohamed Soufi
    • 1
    Email author
  • Toufik Remmal
    • 1
  • Iz Eddine EL Amrani El Hassani
    • 2
  • Samira Makhoukhi
    • 1
  1. 1.Faculty of Sciences Aïn ChockHassan II University of CasablancaMaârifMorocco
  2. 2.Department of Earth Sciences, Scientific InstituteMohammed V-Agdal UniversityRabatMorocco

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