To obtain the geological age, we need to know the relationship between the two.In other words, how do geological events affect the radioactive system in monazite?
It is a powerful tool in studying the complex history of metamorphic rocks particularly, as well as igneous, sedimentary and hydrothermal rocks.
The dating uses the radioactive processes in monazite as a clock.
Also, textures of monazite crystals may represent certain type of events.
Therefore, direct sampling techniques with high spatial resolution are required, in order to study these tiny zones individually, without damaging the textures and zonations.
There was probably radiogenic lead in the mineralizing fluids plus possibly lead leached out of the host rocks.