Age hercynien des granites de la Chataigneraie (SW du Massif Central francais)

Gravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Central

“…Previous geochronological data on the Glénat, Omps and Boisset granitic plutons yielded Rb/Sr whole rock ages of 272 ± 4 Ma, 270 ± 15 Ma and 281 ± 10 Ma, respectively (Vivier and Lasseyre 1973). In light of modern geochronology, these results appear quite young and poorly reliable, because the age determinations have been performed on whole rock using several analyses to derive an isochron.…”

“…They are intruded by leucogranites (Vivier and Lasseyre 1973;Gébelin et al 2004). To the southwest, the Millevaches series is overthrust by high grade allochthonous gneiss units.…”