@article{fdi:010083484,
  title = {{S}olubility of monazite-cheralite and xenotime in granitic melts, and experimental evidence of liquid-liquid immiscibility in concentrating ree},
  author = {{V}an {L}ichtervelde, {M}arieke and {G}oncalves, {P}. and {E}glinger, {A}. and {C}olin, {A}. and {M}ontel, {J}. {M}. and {D}acheux, {N}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e provide new experimental data on monazite, xenotime and {U}-{T}h-bearing cheralite solubility in slightly peralkaline to peraluminous granitic melts using dissolution and reverse (i.e. recrystallization after dissolution) experiments in water-saturated and flux-bearing ({P} + {F} + {L}i) granitic melts, at 800 degrees {C} and 200 {MP}a. {A}lthough a positive correlation between rare earth element ({REE}) solubility and melt peralkalinity is confirmed, monazite solubilities reported here are much lower than the values previously published. {W}e suggest that the presence of elevated phosphorus concentrations in our melts depresses monazite solubility, principally because phosphorus complexes with {A}l and alkali, which normally depolymerize the melt through the formation of non-bridging oxygens. {T}he new solubility data provide an explanation for the very low {REE} concentrations generally encountered in phosphorus-bearing peraluminous granites and pegmatites. {T}his accounts for the compatibility of {REE} in peraluminous systems, as the early crystallization of {REE}-bearing minerals (mainly monazite and zircon) leads to progressive {REE} depletion during liquid differentiation. {I}n addition, dissolution and reverse experiments on {U}-{T}h-bearing cheralite-monazite display liquid-liquid immiscibility processes in our slightly peralkaline glass. {T}he immiscible liquid forms droplets up to 10 mu m in diameter and hosts on average 35 wt% {P}2{O}5, 25-30 wt% {F}, 22 wt% {A}l2{O}3, 4 wt% {C}a{O}, 5 wt% {N}a2{O}, 2 wt% {L}a2{O}3, and 12 wt% {T}h{O}2 + {UO}2. {W}e believe that the droplets formed during the runs and may have coalesced to larger droplets during quenching. {W}e suggest that liquid-liquid immiscibility is a possible mechanism of {REE} concentration in highly fluxed melts and should be considered in natural systems where {REE} are extremely concentrated (up to thousands of mu g g(-1)) in magmatic rocks.},
  keywords = {dissolution experiments ; granitic melts ; liquid-liquid immiscibility ; monazite-cheralite solubility ; pegmatites},
  booktitle = {},
  journal = {{J}ournal of {P}etrology},
  volume = {62},
  numero = {8},
  pages = {egab020 [ 20 ]},
  ISSN = {0022-3530},
  year = {2021},
  DOI = {10.1093/petrology/egab020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083484},
}