Geological context of the dated samples. — A. Geological context of Central Vosges samples after maps (Hameurt, 1966; von Eller et al., 1970; Ménillet et al., 1978) merged and redrawn using results from the present work. Background digital elevation map from GeoMapApp.org, with illumination from NW. RSF, see Fig. 2. 1: Bt-Sil Granite-Gneiss main body. 2: Andalusite Granite-Gneiss. 3: Bi-Act Granite-Gneiss and “Granite Fondamental”, anatectic bodies. 4: cloudy, Grt-Crd “Gneiss Perlé” granulitic migmatite. 5: porphyritic, Hbl-Bt monzogranite (“Granite des Crêtes”). 6: porphyritic leucogranite (Vic leucogranite and Valtin two-mica granite). 7: syn-thrusting Straiture Granite. 8: vaugnerite dyke. 9: microgranite dyke. 10: Quaternary river deposit. 11: major fault. 12: sample for geochronology (this paper). 13: sample GG4 from Tabaud et al. (2015) − see text for discussion. — B. Geological map of Southern Vosges vaugnerites and explanatory cross-sectional sketch (not to scale), redrawn and oversimplified after André (1983), Ménillet et al. (1989), Théobald et al. (1974); background digital elevation map from GeoMapApp.org, illuminated from NW. 1: Devonian to Early Visean deposits. 2: Early-Middle Visean volcanics and intrusives. 3: syenite, vaugnerite, monzonite and gabbro. 4: Ballons monzonitic, KF-porphyric, cpx-bio granite. 5: Late Visean, mainly volcanic deposits. Location of rocks dated by U-Pb on zircon: Vo15-08: LA-ICP-MS, this study. a: 340 + 4/-2 Ma, and b + c: 342 ± 1 Ma, ID-TIMS by Schaltegger et al. (1995); d: 336.3 ± 3.5 Ma (sample BA11), e: 345.5 ± 2.2 Ma (sample BAB5), and f: 345.3 ± 2.5 Ma (BAB4): LA-ICP-MS by Tabaud et al. (2015). Named places: S, Sewen; BA, Ballon d’Alsace; SM, St-Maurice-sur-Moselle; SV, Servance; CL, Château-Lambert.