zircon dating discordia

Herein, the slope years t slope s for the U-Pb dating method for the Concordia and Discordia lines are presented, and a method for estimating values for t slope from the experimental data is proposed. The maficultramafic complex near Finero Ivrea-Verbano Zone. Toggle navigation. Meta-andesites associated with these porphyroids contain older zircons dated at and Ma [ 15 ]. Thus, radiogenic Pb could diffuse in a different manner than the Pb in their experiments with the PbSO 4 source they used. It is noteworthy that in Precambrian zircons from the Canadian Shield, such discordance can mostly be avoided by abrading zircon grains before analysis. It includes metamorphic rocks equilibrated under greenschist to amphibolite facies conditions in Variscan times and reworked by Alpine tectonics [ 49 , 46 , 18 ].

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