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. Chaine-des-puys, . Cantal, . Aubrac, . Deves, and L. Velay, The bright grey area corresponds to the extension of crystalline basement rocks of the Massif Central. (b) Local map of the Allanche river basin with bedrock sampling points. (c) Detailed geological maps of the sampling locations plotted on the 1:50,000-scale geological map from http://infoterre.brgm.fr. The three types of bedrock correspond to the labels 8?i, pp.8-8

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. Downes, 206 Pb/ 204 Pb ratios of the Allanche volcanic rocks. 'NHRL' corresponds to NHRL mixing line of Hart (1984) defined for the northern hemisphere between the end-members DM and HIMU. Upper and lower crust end-members are also indicated (Variscan granitoids, meta-igneous granulites and meta-sedimentary granulites, Downes, Figure 4. Plot of 208 Pb/ 204 Pb vs Additional data are from the Chaine des Puys, the Cantal, the Forez, and the Languedoc, 1984.