Fig. 4


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Representative samples of host rocks and orebodies from the Puy-les-Vignes deposit. (A) Polygenic breccia constituting the main body of the pipe composed of angular to subangular clasts of greisenized gneisses (Gn) and granites (Gr) rimmed by an aureole of tourmalinite and cemented by milky quartz (sample PLV-02-04). (B) Typical clast of greisenized gneiss rimmed by a cm-thick aureole of tourmalinite and cemented by quartz (sample PLV-7571). (C) Wolframite-bearing quartz vein crosscutting gneiss (sample PLV-7574). (D) Typical vein assemblage composed of quartz, wolframite and arsenopyrite with minor chalcopyrite (sample PLV-02-29). (E) Wolframite partially replaced by orange-brownish-colored scheelite in a quartz vein (sample PLV-3071). (F) Spectacular sample of centimetric ferberite pseudomorph after scheelite (“reinite”). (G) Microgranite dyke (Mg) crosscutting the foliation of biotite-sillimanite gneiss (sample PV-92-7). (H) Rare-metal granite (RMG) showing a magmatic layering composed of a repetitive sequence of quartz-albite-muscovite bands (“B1”) evolving to albite-quartz bands (“B2”) (sample PLV-02-02). The last albite-quartz zone in the lower part of the sample shows unidirectional solidification texture (UST) preceding the transition to a granitic pegmatite (Pgm). Mineral abbreviations according to the IMA.

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