Fig. 8

Eu/Eu* versus Yb/Yb* of modeled leachates obtained by mixing the matrix component and a fraction of the sulfides present in EH3 (CaS and MgS). WR = whole rock (averaged from Gannoun et al. 2011; Barrat et al. 2014); budget = reconstruction of the whole rock composition using mineral modes and REE abundances in CasS, MgS, and enstatite; en = enstatite; CaS = oldhamite; MgS = niningerite (from Gannoun et al. 2011). Leachates L1, L2, L3 are modeled by varying the relative proportions of the matrix component and sulfides, so as to illustrate the possible combinations for the sign of the Eu and Yb anomalies observed in leachates (Boyet and Gannoun 2013; Barrat et al. 2014). a The matrix component consists of the missing component identified by mass balance. Leachate L1 is obtained by mixing this component with 14% and 75% of the CaS and the MgS present in the rock, respectively; L2 by using 8% of the CaS and 100% of the MgS; L3 by using 5% of the CaS and 30% of the MgS. b The matrix composition is modeled as an early condensate (see Fig. 6). Leachates are simulated by mixing this condensate with CaS and MgS in the following proportions: L1 = 92.8% condensate + 1.7% CaS + 5.6% MgS; L2 = 92.5% condensate + 1.3% CaS + 6.2% MgS; L3 = 94.3% condensate + 0.9% CaS + 4.7% MgS