Overview of Results from the Greenstone ... - Geology Ontario

Table A2. continued
204
U Th Pb* Pb f206
207 206 Pb/ Pb ± 1σ Disc. Corr.
206 204
Spot (ppm) (ppm) Th/U (ppm) (ppb) Pb/ Pb (%)
207 235 206 238 207 206 Pb/ U ± 1σ Pb/ U ± 1σ Pb/ Pb ± 1σ Age (Ma) (%) Coeff.
04JAA-0003, Porcupine assemblage wacke, continued…
37.2 224 141 0.649 135 16 5992 0.29 13.0152 ± 0.1771 0.51089 ± 0.00624 0.18477 ± 0.00086 2696.1 ± 7.7 1.6 0.941
15.2 76 66 0.894 48 4 8514 0.20 13.0175 ± 0.2057 0.51101 ± 0.00673 0.18475 ± 0.00134 2696.0 ± 12.0 1.6 0.890
29.1 131 177 1.396 90 3 16776 0.10 12.9752 ± 0.1737 0.50949 ± 0.00594 0.18471 ± 0.00097 2695.6 ± 8.7 1.9 0.921
21.1 113 34 0.314 64 3 14312 0.12 13.1206 ± 0.1816 0.51630 ± 0.00601 0.18431 ± 0.00113 2692.0 ± 10.2 0.4 0.897
3.1 141 166 1.216 93 2 33979 0.05 12.8584 ± 0.1759 0.50701 ± 0.00583 0.18394 ± 0.00112 2688.7 ± 10.1 2.0 0.896
15.1 90 109 1.257 61 3 15542 0.11 13.0198 ± 0.1807 0.51357 ± 0.00604 0.18387 ± 0.00111 2688.1 ± 10.0 0.7 0.902
37.1 287 127 0.457 165 15 8215 0.21 12.9250 ± 0.1659 0.50985 ± 0.00591 0.18386 ± 0.00078 2688.0 ± 7.1 1.5 0.944
13.1 92 91 1.021 58 3 14815 0.12 12.7417 ± 0.1780 0.50268 ± 0.00595 0.18384 ± 0.00112 2687.8 ± 10.1 2.8 0.902
18.1 91 76 0.866 57 7 6134 0.28 12.9223 ± 0.1885 0.50983 ± 0.00624 0.18383 ± 0.00120 2687.7 ± 10.9 1.4 0.895
33.1 128 63 0.508 77 6 9925 0.18 13.2518 ± 0.2042 0.52323 ± 0.00733 0.18369 ± 0.00090 2686.5 ± 8.2 -1.2 0.949
22.1 89 74 0.855 56 6 6055 0.29 12.8801 ± 0.1853 0.50893 ± 0.00588 0.18355 ± 0.00133 2685.2 ± 12.1 1.5 0.866
40.1 28 19 0.676 17 12 1116 1.55 13.1588 ± 0.3351 0.52020 ± 0.00791 0.18346 ± 0.00341 2684.4 ± 31.1 -0.7 0.689
44.1 212 145 0.706 128 17 5462 0.32 12.9223 ± 0.1622 0.51163 ± 0.00564 0.18318 ± 0.00087 2681.9 ± 7.9 0.8 0.926
26.1 137 127 0.958 87 16 3832 0.45 12.8940 ± 0.1891 0.51074 ± 0.00593 0.18310 ± 0.00140 2681.2 ± 12.7 1.0 0.857
10.1 69 68 1.022 43 7 4079 0.43 12.4655 ± 0.1881 0.49381 ± 0.00598 0.18309 ± 0.00139 2681.0 ± 12.7 4.2 0.866
30.1 93 79 0.869 58 10 4067 0.43 12.6618 ± 0.2124 0.50398 ± 0.00688 0.18221 ± 0.00149 2673.1 ± 13.6 1.9 0.875
1.2 476 290 0.630 267 7 29028 0.06 12.0295 ± 0.1367 0.48346 ± 0.00514 0.18046 ± 0.00052 2657.1 ± 4.8 5.2 0.968
40.2 26 15 0.581 15 24 503 3.44 12.4562 ± 0.4154 0.50693 ± 0.00796 0.17821 ± 0.00491 2636.3 ± 46.5 -0.3 0.574
1.1 157 146 0.957 92 2 25887 0.07 11.5292 ± 0.2135 0.47093 ± 0.00668 0.17756 ± 0.00182 2630.2 ± 17.2 6.5 0.835
03RJB-18972-6, Porcupine sandstone, south of PDDZ, Whitney Township (E491548, N5372704), # 21 on Fig. 2.
7.1 95 61 0.663 58 24 1731 1.00 13.3490 ± 0.1899 0.50845 ± 0.00571 0.19041 ± 0.00142 2745.7 ± 12.3 4.2 0.855
12.1 188 93 0.509 111 12 7085 0.25 13.4732 ± 0.1649 0.51573 ± 0.00568 0.18947 ± 0.00079 2737.6 ± 6.8 2.5 0.942
8.1 452 326 0.745 283 17 11767 0.15 13.6085 ± 0.1527 0.52224 ± 0.00560 0.18899 ± 0.00042 2733.4 ± 3.7 1.1 0.980
3.1 325 89 0.281 187 8 17652 0.10 13.7067 ± 0.1501 0.52733 ± 0.00546 0.18852 ± 0.00047 2729.3 ± 4.1 0.0 0.974
6.1 157 40 0.263 88 23 3041 0.57 13.4030 ± 0.1865 0.51748 ± 0.00645 0.18785 ± 0.00091 2723.4 ± 8.0 1.6 0.939
15.1 96 38 0.408 55 18 2387 0.73 13.1765 ± 0.1945 0.51096 ± 0.00649 0.18703 ± 0.00114 2716.2 ± 10.1 2.5 0.912
13.1 105 80 0.792 63 23 1941 0.89 12.7006 ± 0.1857 0.49712 ± 0.00555 0.18529 ± 0.00151 2700.8 ± 13.5 4.5 0.833
14.1 77 35 0.468 44 11 2947 0.59 13.0331 ± 0.1819 0.51018 ± 0.00582 0.18528 ± 0.00125 2700.7 ± 11.2 2.0 0.877
2.1 237 490 2.136 187 11 9438 0.18 13.1180 ± 0.1500 0.51520 ± 0.00547 0.18467 ± 0.00058 2695.2 ± 5.2 0.7 0.963
4.1 494 994 2.078 388 24 9092 0.19 13.1558 ± 0.1406 0.51725 ± 0.00529 0.18447 ± 0.00038 2693.4 ± 3.4 0.3 0.982
5.2 204 293 1.488 143 6 14795 0.12 13.0101 ± 0.1497 0.51216 ± 0.00546 0.18424 ± 0.00059 2691.4 ± 5.3 1.2 0.961
10.1 613 371 0.625 367 44 6205 0.28 13.0607 ± 0.1963 0.51418 ± 0.00620 0.18422 ± 0.00140 2691.3 ± 12.6 0.8 0.866
5.3 523 1088 2.149 414 19 11943 0.15 13.1099 ± 0.1482 0.51625 ± 0.00550 0.18418 ± 0.00049 2690.9 ± 4.5 0.3 0.972
1.1 742 431 0.600 449 37 8985 0.19 13.1345 ± 0.2367 0.51999 ± 0.00767 0.18320 ± 0.00159 2682.0 ± 14.4 -0.8 0.879
6.2 269 49 0.186 133 29 3743 0.46 11.7457 ± 0.1599 0.47106 ± 0.00568 0.18084 ± 0.00090 2660.6 ± 8.3 7.8 0.931
11.1 1176 743 0.653 649 33 14828 0.12 10.8083 ± 0.1793 0.47765 ± 0.00767 0.16412 ± 0.00043 2498.5 ± 4.4 -0.9 0.988
Uncertainties are reported at 1σ (absolute) and are calculated by numerical propagation of all known sources of error.
Pb* = radiogenic Pb; f206 (%): Percentage of 206Pb which is common.
Disc (%) = Percent discordance along a chord to origin for the given 207Pb/206Pb age; Corr. Coeff. = Correlation coefficient (rho).
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