PROGRADE METAMORPHISM OF APATITE, MONAZITE AND XENOTIME

Apatite, monazite, and xenotime are found in rocks of nearly every metamorphic grade and, apparently, have wide P-T stability ranges. Despite their widespread occurrence, surprisingly few studies on the prograde metamorphic evolution of phosphates have been published. Kapustin (1987) reported on apatite compositions as a function of metamorphic grade (e.g., Fig. lb). 

Rubatto et al. (2001) reported on the prograde metamorphism of monazite and zircon from pelitic schists from the Reynolds Range, central Australia. They identified monazite 

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