Table 1. U/Pb CA-TIMS isotopic data Pb/U.

MDAs via youthful detrital zircons.

Sample	LA-ICPMS							Radiogenic Isotope Ratios								Isotopic Dates
		$\frac{\mathrm{T}\mathrm{h}}{\mathrm{U}}$	206Pb* × 10−13 mol	mol % 206Pb*	$\frac{\mathrm{P}\mathrm{b}}{\mathrm{P}{\mathrm{b}}_{\mathrm{c}}}$*	Pbc (pg)	$\frac{{}^{206}\mathrm{P}\mathrm{b}}{{}^{204}\mathrm{P}\mathrm{b}}$	$\frac{{}^{208}\mathrm{P}\mathrm{b}}{{}^{206}\mathrm{P}\mathrm{b}}$	$\frac{{}^{207}\mathrm{P}\mathrm{b}}{{}^{206}\mathrm{P}\mathrm{b}}$	% err	$\frac{{}^{207}\mathrm{P}\mathrm{b}}{{}^{235}\mathrm{U}}$	% err	$\frac{{}^{206}\mathrm{P}\mathrm{b}}{{}^{238}\mathrm{U}}$	% err	corr. coef.	$\frac{{}^{207}\mathrm{P}\mathrm{b}}{{}^{206}\mathrm{P}\mathrm{b}}$	±	$\frac{{}^{207}\mathrm{P}\mathrm{b}}{{}^{235}\mathrm{U}}$	±	$\frac{{}^{206}\mathrm{P}\mathrm{b}}{{}^{238}\mathrm{U}}$	±
(a)	label	(b)	(c)	(c)	(c)	(c)	(d)	(e)	(e)	(f)	(e)	(f)	(e)	(f)		(g)	(f)	(g)	(f)	(g)	(f)
MHL-Cox 2
z1	144	0.971	0.2723	99.25%	44.5	0.17	2392	0.311	0.047845	0.303	0.094027	0.321	0.014260	0.053	0.422	90.54	7.18	91.25	0.28	91.275	0.048
z2	145	0.513	0.2190	99.45%	54.5	0.10	3279	0.164	0.048009	0.226	0.093912	0.244	0.014194	0.045	0.496	98.63	5.33	91.14	0.21	90.855	0.040
MHM-Cox 3
z1	262	0.438	0.3606	99.52%	61.7	0.14	3789	0.140	0.048001	0.198	0.102478	0.210	0.015491	0.051	0.343	98.25	4.69	99.06	0.20	99.095	0.051
z2	263	1.472	0.2384	99.49%	74.4	0.10	3566	0.471	0.047968	0.229	0.094457	0.248	0,014288	0.047	0.483	96.65	5.43	91.65	0.22	91.454	0.043
MHU-Cox 4
z2	33	0.503	0.1096	98.88%	26.6	0.10	1618	0.161	0.048049	1.003	0.097621	1.064	0.014742	0.152	0.464	100.64	23.71	94.58	0.96	94.338	0.142
z1a	17	0.562	0.0828	98.15%	16.2	0.13	978	0.180	0.047993	0.755	0.091585	0.796	0.013847	0.084	0.525	97.87	17.86	88.98	0.68	88.648	0.074
z1b	17	0.627	0.0767	89.79%	2.7	0.72	177	0.201	0.048354	2.643	0.092014	2.779	0.013808	0.326	0.465	115.55	62.31	89.38	2.38	88.401	0.286

Notes:

(a) z1, z2, etc. are labels for analyses composed of single zircon grains that were annealed and chemically abraded (Mattinson, 2005). z1a and z1b are fragments from the same grain.

(b) Model Th/U ratio calculated from radiogenic 208Pb/206Pb ratio and 207Pb/235U date.

(c) Pb* and Pbc are radiogenic and common Pb, respectively. mol % ²⁰⁶Pb* is with respect to radiogenic and blank Pb.

(d) Measured ratio corrected for spike and fractionation only. Fractionation correction for single-collector Daly analyses is based on measurement of 202Pb/205Pb in the EARTHTIME ET2535 tracer solution.

(e) Corrected for fractionation and spike. Common Pb in zircon analyses is assigned to procedural blank with composition of 206Pb/204Pb = 18.04 ± 0.61%; 207Pb/204Pb = 15.54 ± 0.52%; 208Pb/204Pb = 37.69 ± 0.63% (1 sigma). 206Pb/238U and 207Pb/206Pb ratios corrected for initial disequilibrium in 230Th/238U using a D(Th/U) of 0.20 ± 0.05 (1 sigma).

(f) Errors are 2 sigma, propagated using algorithms of Schmitz & Schoene (2007) and Crowley, Schoene & Bowring (2007).

(g) Calculations based on the decay constants of Jaffey et al. (1971). 206Pb/238U and 207Pb/206Pb dates corrected for initial disequilibrium in 230Th/238U using a D(Th/U) of 0.20 ± 0.05 (1 sigma).