Fig. 9


Download original image

Major element compositions of granitic rocks from the Puy-les-Vignes deposit compared to the main peraluminous granitoids from the northwestern French Massif Central (FMC). (A) Alumina saturation diagram representing the molar ratio A/NK = Al2O3/(Na2O + K2O) as function of the molar ratio A/CNK = Al2O3/(CaO + Na2O + K2O. (B) B–A diagram representing the differentiation index B = Fe + Mg + Ti as function of the peraluminous index A = Al–(Na + K + 2Ca) expressed in millications (after Debon and Le Fort, 1983). The peraluminous granite fields of Villaseca et al. (1998) represent highly peraluminous granitoids (h-P), moderately peraluminous granitoids (m-P), low peraluminous granitoids (l-P), and highly felsic peraluminous granitoids (f-P). (C) P-Q diagram representing the relative proportion of feldspar P = K–(Na + Ca) as function of the quartz content Q = Si/3–(Na + K + 2Ca/3) expressed in millications (after Debon and Le Fort, 1983). (D) Total alkali-silica (TAS) diagram representing the Na2O + K2O vs. SiO2 content (after Le Bas et al., 1986). Whole-rock compositions of the granitic rocks are reported in Table 1. Data sources: rare-metal granites and pegmatites: Aubert (1969), Mourey (1985), Cuney et al. (1992), Raimbault et al. (1995), Raimbault (1998), Raimbault and Burnol (1998); muscovite-bearing peraluminous granitoids: Gauthier (1973), Burnol (1974), Arniaud et al. (1984), Soufi (1988), Leger et al. (1990), Downes et al. (1997), Solgadi et al. (2007), Moyen et al. (2017), Villaros and Pichavant (2019); cordierite-bearing peraluminous granitoids: Downes and Duthou (1988), Williamson et al. (1996), Downes et al. (1997), Cartannaz (2005), Solgadi et al. (2007), Couzinié (2017), Moyen et al. (2017).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.