IMPACT OF WATER-FLUXED MELTING ON MELT COMPOSITION: EXPERIMENTS VS. PHASE EQUILIBRIA MODELING
Here a comparative study of phase equilibria modeling and melting experiments is presented. Modelling results do not support the existence of a clear link between fluid regime and melt composition. In particular, the formation of trondhjemitic melts via H2O-fluxed melting reactions does not seem a general rule under equilibrium conditions. The potential causes of this discrepancy (e.g., persistence of metastable phases during experiments, limitations of models for minerals and melt, disequilibrium melting reactions under H2O-present conditions) will be evaluated and discussed. The nanogranitoid compositional dataset will be interrogated to determine the possible role of water-fluxed melting in the formation of peculiar melt compositions.