Data Set S2 Sample U (ppm)1 Th/U1 206Pb/204Pb2 206Pb*/238U3 %err 207Pb*/235U3 %err 207Pb*/206Pb*3 %err rho4 206Pb/238U age5 ± 1s 207Pb/235U age5 ± 1s 207Pb/206Pb age5 ± 1s 2727M01 2727M01-1 168 0.3 3861 0.02865 1.1 0.21765 20.3 0.05509 20.2 0.05 182.1 2.0 200.0 40.5 415.9 484.6 2727M01-2 184 0.4 3838 0.02818 1.5 0.23750 16.4 0.06112 16.4 0.10 179.2 2.6 216.4 35.6 643.5 354.3 2727M01-3 232 0.4 3354 0.02663 1.5 0.16029 24.4 0.04366 24.4 0.05 169.4 2.6 151.0 36.8 -129.9 648.8 2727M01-4 217 0.4 3473 0.02702 1.9 0.19213 18.9 0.05157 18.8 0.09 171.9 3.1 178.4 33.8 266.6 460.0 2727M01-5 128 0.2 3058 0.02593 3.1 0.14532 13.9 0.04065 13.5 0.33 165.0 5.0 137.8 19.1 -309.4 359.0 2727M01-6 187 0.3 3589 0.02669 2.6 0.17838 28.2 0.04846 28.1 0.05 169.8 4.4 166.7 47.1 121.9 728.6 2727M01-7 152 0.3 2532 0.02790 2.9 0.18012 23.4 0.04682 23.2 0.07 177.4 5.1 168.2 39.4 40.3 598.9 2727M01-8 211 0.4 3656 0.02705 3.1 0.22092 14.2 0.05924 13.9 0.21 172.0 5.3 202.7 28.8 575.9 302.7 2727M01-9 148 0.3 2738 0.02706 3.6 0.19637 27.7 0.05264 27.4 0.05 172.1 6.2 182.0 50.4 313.1 687.7 2727M01-10 176 0.4 2112 0.02780 4.0 0.26393 22.6 0.06886 22.3 0.09 176.7 6.9 237.8 53.8 894.6 464.9 2727M01-11 133 0.3 2770 0.02683 3.8 0.25000 21.6 0.06759 21.3 0.07 170.7 6.5 226.6 49.0 855.8 447.1 2727M01-12 130 0.3 1490 0.02684 3.8 0.20897 23.0 0.05647 22.7 0.04 170.7 6.4 192.7 44.3 471.0 544.3 2727M01-13 150 0.4 3594 0.02746 4.1 0.23615 31.3 0.06238 31.0 0.03 174.6 7.1 215.3 67.4 687.1 678.0 2727M01-14 147 0.4 3617 0.02907 4.2 0.22707 28.1 0.05664 27.8 0.04 184.8 7.6 207.8 58.4 477.7 681.2 2727M01-15 230 0.5 1068 0.02813 4.1 0.20198 15.6 0.05208 15.1 0.06 178.8 7.3 186.8 29.2 288.7 362.3 2727M01-16 149 0.3 3387 0.02770 4.2 0.24699 28.9 0.06467 28.6 0.04 176.1 7.3 224.1 64.8 763.5 615.3 2727M01-17 262 0.3 5220 0.03114 4.7 0.22164 21.7 0.05163 21.2 0.15 197.7 9.2 203.3 44.2 268.8 522.5 2727M01-18 252 0.4 2962 0.02863 4.1 0.26256 15.8 0.06651 15.2 0.13 182.0 7.3 236.7 37.3 822.6 319.6 2727M01-19 237 0.4 5119 0.02850 4.0 0.19482 18.6 0.04957 18.2 0.06 181.2 7.1 180.7 33.6 174.9 449.6 2727M01-20 128 0.3 3691 0.02874 4.1 0.19833 14.2 0.05005 13.6 0.23 182.7 7.4 183.7 26.2 197.1 330.4 2727M01-21 197 0.4 4360 0.02827 3.9 0.16535 14.4 0.04241 13.9 0.08 179.7 6.9 155.4 22.4 -201.8 361.5 2727M01-22 195 0.3 5158 0.02891 3.9 0.21268 29.2 0.05335 28.9 0.03 183.7 7.2 195.8 57.1 343.7 725.4 2727M01-23 142 0.4 2283 0.03001 4.8 0.23060 29.4 0.05572 29.0 0.11 190.6 9.0 210.7 61.9 441.4 717.5 2727M01-24 177 0.3 3177 0.02945 3.9 0.21558 24.7 0.05308 24.4 0.02 187.1 7.1 198.2 49.0 332.3 602.9 2727M01-25 157 0.3 2087 0.03023 3.6 0.20826 31.9 0.04996 31.7 0.03 192.0 6.9 192.1 61.2 193.1 823.6 2727M01-26 303 0.5 5253 0.02850 3.4 0.17325 19.0 0.04408 18.7 0.07 181.2 6.0 162.2 30.8 -106.1 486.7 2727M01-27 170 0.5 3080 0.02844 3.0 0.18562 33.5 0.04733 33.4 0.02 180.8 5.3 172.9 57.9 66.1 892.3 2727M01-28 184 0.4 3718 0.02791 2.7 0.18432 20.0 0.04789 19.8 0.05 177.5 4.6 171.8 34.3 93.9 499.2 2727M01-29 259 0.2 7186 0.02924 2.2 0.17418 19.9 0.04320 19.7 0.08 185.8 4.0 163.0 32.4 -156.0 519.8 2727M01-30 186 0.5 3202 0.02808 2.2 0.13194 15.4 0.03407 15.2 0.13 178.5 3.9 125.8 19.3 -783.7 444.2 2727M01-31 212 0.5 3462 0.02902 1.8 0.21552 19.8 0.05386 19.8 0.05 184.4 3.2 198.2 39.3 365.4 476.3 2727M01-32 367 0.4 7391 0.02802 1.7 0.16491 17.9 0.04268 17.8 0.05 178.2 3.0 155.0 27.8 -186.0 468.9 2727M01-33 157 0.4 2739 0.02792 2.2 0.16137 33.4 0.04192 33.3 0.04 177.5 3.8 151.9 50.7 -231.3 935.5 2727M01-34 163 0.4 5323 0.02890 2.1 0.20694 18.5 0.05193 18.3 0.08 183.7 3.8 191.0 35.2 282.4 445.6 2727M01-35 217 0.3 6410 0.02771 2.0 0.18767 22.1 0.04912 22.0 0.06 176.2 3.5 174.6 38.6 153.5 554.7 2727M01-36 106 0.3 1882 0.03042 3.2 0.15697 14.9 0.03743 14.6 0.26 193.2 6.0 148.1 22.1 -525.7 404.1 2727M01-37 100 0.2 1526 0.02831 2.4 0.22072 34.8 0.05655 34.8 0.05 180.0 4.3 202.5 70.6 473.9 879.5 2727M01-38 172 0.4 2993 0.02739 2.0 0.24024 21.9 0.06361 21.8 0.05 174.2 3.5 218.6 47.8 728.7 466.6 2727M01-39 103 0.3 2332 0.02838 2.5 0.23451 36.5 0.05994 36.4 0.05 180.4 4.5 213.9 78.2 601.3 913.0 2727M01-40 208 0.3 1872 0.02846 2.0 0.21569 22.3 0.05496 22.2 0.06 180.9 3.6 198.3 44.2 410.5 536.4 2727M01-41 192 0.4 6690 0.02707 2.0 0.20289 17.5 0.05435 17.4 0.10 172.2 3.3 187.6 32.8 385.6 392.5 2727M01-42 221 0.4 2872 0.02796 1.8 0.21212 16.9 0.05503 16.8 0.07 177.7 3.1 195.3 33.0 413.4 377.7 2727M01-43 102 0.3 3022 0.02611 2.8 0.17376 30.2 0.04826 30.1 0.08 166.2 4.7 162.7 49.2 112.1 787.6 2727M01-44 277 0.2 10241 0.02648 2.1 0.17380 15.7 0.04760 15.5 0.08 168.5 3.4 162.7 25.5 79.5 386.7 2727M01-45 247 0.2 7643 0.02754 2.2 0.20021 19.0 0.05273 18.9 0.05 175.1 3.8 185.3 35.2 317.3 456.7 2727M01-46 140 0.3 5108 0.02655 2.9 0.12968 12.7 0.03543 12.4 0.21 168.9 4.8 123.8 15.7 -675.0 351.3 2727M01-47 73 0.2 2112 0.02682 3.1 0.23565 37.0 0.06373 36.9 0.06 170.6 5.2 214.9 79.6 732.5 808.5 2727M01-48 157 0.3 5760 0.02707 2.5 0.17675 26.7 0.04735 26.6 0.05 172.2 4.3 165.3 44.2 66.8 692.2 2727M01-49 188 0.4 5100 0.02745 3.6 0.20464 20.0 0.05406 19.6 0.15 174.6 6.2 189.0 37.7 373.7 472.4 2727M01-50 158 0.3 3416 0.02730 2.6 0.18617 24.9 0.04945 24.7 0.05 173.7 4.5 173.4 43.1 169.3 627.5 "1 U concentrations (ppm) and Th/U ratios were calibrated assuming uniform concentrations of U = 148 ppm and Th = 100 ppm (Black et al., 2004) in the R33 zircon standard." 2 Observed isotopic ratios corrected for fractionation following Hacker et al. (2006). 3 Radiogenic 207Pb/206Pb and 206Pb/238U ratios corrected for fractionation and common Pb ratios calculated using the Stacey and Kramers (1975) Pb model. One sigma percent errors are shown in parentheses. 4 Correlation coefficient of radiogenic 207Pb*/235U and 206Pb*/238U were calculated as r = (2sigma206/238)/(2sigma207/235) "5 Ages (Ma) calculated using 238U/235U = 137.88, and decay constants of 238U = 1.5513 x 10-10 yr-1 and 235U = 9.8485 x 10-10 yr-1. Age uncertainties are 1-sigma absolute errors."