Fig. 3


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Field relations of the Puy-les-Vignes breccia pipe. (A) Outcrop of the polygenic breccia composed of decimetric to metric clasts of altered gneisses (Gn) and granites (Gr) partially to completely tourmalinized. The clasts are angular to subangular in shape and are systematically rimmed by tourmaline (Tur) and cemented by quartz (Qtz). (B-C) Details of greisenized gneissic clasts showing relict foliation (white dashed lines) and an irregular tourmalinite aureole of variable thickness. (D) Wolframite (Wfm) disseminated within the quartz of the breccia and partially altered by goethite (Gt). (E) Wolframite-bearing quartz vein with tourmaline selvages crosscutting the St-Léonard-de-Noblat gneisses observed in an old underground adit at Lifarnet.

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