Which isotope ratio should be used to assess Precambrian detrital zircons: 206Pb/238U age vs. 207Pb/206Pb?

If I want to plot detrital zircon ages of Precambrian age (600 to 2500 Ma) on a probability density plot, which age (i.e. 206Pb/238U or 207Pb/206Pb) should I use? In the literature, one often...

22 July 2015 2,852 13 View