Fig. 11
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Whole-rock (U/Th)N, (Th/Nb) N, (La/Yb)N and NdN normalized to the primitive mantle composition in function of the loss on ignition (LOI). LOI is considered as a proxy for fluid addition during retrogression in the crust (mostly serpentinization). Lack of correlation with the LOI ((U/Th)N, (Th/Nb)N, (La/Yb)N) or slightly negative correlation (Nd) suggests that late fluid-addition during retrogression had little effect on whole-rock trace element compositions. Two serpentinite outliers with high (U/Th)N (contoured spots) might have nevertheless experienced significant contamination by fluid. See caption of Figure 8 for the legend. Primitive manle composition after McDonough and Sun (1995).
Sélections de paramètres géochimiques sur roche totale (U/Th) N, (Th/Nb)N, (La/Yb)N et NdN (composition normalisée au manteau primitif) en fonction de la perte au feu (LOI). Celle-ci est utilisée comme un indicateur de l’intensité des réactions de rétrogression tardives (serpentinisation principalement), associées à un fort apport de fluide. L’absence de corrélation avec la LOI ((U/Th)N, (Th/Nb)N, (La/Yb)N) ou la présence de corrélation légèrement négative (Nd) suggère que l’apport tardif de fluides pendant la rétrogression a eu peu d’effets sur la composition en éléments traces de la roche totale. Légende identique à la figure 8. Composition du manteau primitif d’après McDonouh and Sun (1995).
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