In the radioactive processes, the three unstable parent isotopes decay into their respective stable daughter isotopes of Pb.Each following a decay chain consisting of alpha and beta decays, parent isotopes Radiometric age represents the time when the decay process starts.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?
Both the oldest and youngest points appear to be outliers and should probably be ignored in any case.
Geological age represents the time when a geological event occurs.
Manipulating the isotopic ratios can only give us radiometric age.
(download a 650 Kb Excel file) The probe data files have been organized into a spreadsheet (modeled on the spreadsheet that Mike supplied) that computes the ages.
Several improvements have been made: There are clearly age domains within the monazites analyzed from the Rincon Range that when averaged agree reasonably well with the isotopically derived age for these samples.