Fractionation of Monazite in the Development of V-Shaped Ree Patterns in Leukogranite Systems - Evidence From a Muscovite Leukogranite Body in Central Australia

Geochemical modelling based on K(d) values for rare earth (REE) and other trace elements suggests that a Proterozoic muscovite leucogranite from the Atnarpa area, southeastern Arunta Inlier, central Australia was derived from a restite-free melt by simple but extensive crystal fractionation involving feldspars, biotite and accessory REE-rich minerals such as monazite and zircon at a pressure of 0.5-1.0 kbars and a temperature below 750-degrees-C. This study indicates that REE-rich accessory minerals, particularly monazite, play an important role in the evolution of the REE in high-Si, low temperature, granitic melt systems