Fig. 2 Tera-Wasserburg plot of zircon dates from LASS and APM data.

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GEOCHRONOLOGY 2006 Lecture 04 U-Th-Pb Dating

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Presentation transcript:

Fig. 2 Tera-Wasserburg plot of zircon dates from LASS and APM data. Tera-Wasserburg plot of zircon dates from LASS and APM data. Ellipses show results from LASS core and rim analyses with 2σ uncertainty. The discordia line (dashed) constructed from the LASS data indicates an upper intercept of 2144 ± 33 Ma with a lower intercept of 148.6 ± 3.0 Ma. The lower intercept agrees with the timing of clustering of Pb in the zircon core (Fig. 3). The light blue field marks the range of published U-Pb dates measured from zircon rims formed at this time (23, 30). The 207Pb/206Pb dates were calculated from the atom probe data (boxes with 1σ uncertainty); dashed lines project onto concordia. The green box is the 207Pb/206Pb date from all clusters; the dark blue box is the 207Pb/206Pb date corrected for encapsulation at 160 Ma. Yellow diamonds show the modeled effect of Pb loss (%) on U-Pb dates for a zircon that crystallized at 2.15 Ga and was metamorphosed at 150 Ma; italicized numbers correspond to % Pb loss. Emily M. Peterman et al. Sci Adv 2016;2:e1601318 Copyright © 2016, The Authors