Proposed Title 1: - Queen's University

APPENDIX G
Isotopic data and apparent ages for various generations of uraninite from the South Alligator River area
Corrected ratios
Apparent ages ( ±1σ, Ma)**
Sample
Deposit
206 Pb/ 204 Pb
207 Pb/ 204 Pb
207 Pb/ 206 Pb ±2σ
206 Pb/ 238 U ±2σ
207 Pb/ 235 U ±2σ R‡
207 Pb/ 206 Pb ±
206 Pb/ 238 U ±
207 Pb/ 235 U ± Disc‡
c29-217h Coronation Hill 6342 430 0.0678 0.001 0.0931 0.002 0.8695 0.023 0.92 862 15 574 14 635 13 26
c29-217d Coronation Hill 5944 399 0.0673 0.001 0.0932 0.006 0.8633 0.050 0.93 846 33 574 37 632 27 25
c29-217t Coronation Hill 7864 522 0.0665 0.001 0.0937 0.004 0.8598 0.039 0.92 823 29 578 26 630 21 23
c29-217m Coronation Hill 7218 487 0.0674 0.000 0.0942 0.004 0.8759 0.036 0.95 852 11 580 22 639 19 25
c29-217p Coronation Hill 4090 287 0.0701 0.001 0.0950 0.003 0.9185 0.025 0.85 931 28 585 16 662 13 29
c29-217za Coronation Hill 6129 408 0.0671 0.001 0.0954 0.008 0.8805 0.057 0.95 840 43 587 45 641 31 24
c29-217s Coronation Hill 3752 270 0.0722 0.002 0.0955 0.005 0.9487 0.030 0.87 990 49 588 28 677 16 32
C29-217b Coronation Hill 3122 219 0.0703 0.001 0.0967 0.004 0.9367 0.030 0.93 936 23 595 22 671 16 28
c29-217e Coronation Hill 6699 451 0.0675 0.001 0.0986 0.005 0.9178 0.052 0.80 854 42 606 32 661 27 23
c29-217f Coronation Hill 6466 438 0.0678 0.001 0.1009 0.003 0.9440 0.034 0.92 863 21 620 18 675 18 22
c29-217q Coronation Hill 7470 528 0.0707 0.001 0.1016 0.004 0.9900 0.045 0.92 948 17 624 26 699 23 26
c29-217u Coronation Hill 10649 710 0.0668 0.000 0.1026 0.004 0.9441 0.032 0.94 830 14 629 23 675 17 19
c29-217r Coronation Hill 3590 264 0.0735 0.001 0.1048 0.004 1.0621 0.040 0.93 1028 18 642 24 735 20 29
c29-217n Coronation Hill 4666 340 0.0729 0.000 0.1107 0.003 1.1129 0.027 0.93 1011 13 677 17 760 13 25
c29-217z Coronation Hill 9177 677 0.0740 0.002 0.1145 0.004 1.1687 0.054 0.83 1042 49 699 23 786 25 25
c29-217w Coronation Hill 5453 412 0.0758 0.001 0.1147 0.005 1.1984 0.055 0.90 1089 31 700 28 800 25 27
c29-217x Coronation Hill 3742 292 0.0782 0.001 0.1177 0.002 1.2695 0.034 0.87 1152 24 717 14 832 15 28
C29-214Aa Coronation Hill 16126 1278 0.0796 0.0011 0.0838 0.004 0.9202 0.061 1.00 1188 27 519 26 662 33 56
C29-214Ac Coronation Hill 34598 2819 0.0814 0.0012 0.1312 0.001 1.4713 0.021 0.97 1230 28 795 6 919 9 35
C29-214Ae Coronation Hill 22206 1803 0.0811 0.0006 0.0652 0.006 0.7297 0.067 1.00 1223 15 407 34 556 39 67
C29-214Af Coronation Hill 4306 294 0.0683 0.0005 0.0180 0.001 0.1690 0.010 0.99 877 14 115 6 159 8 87
C29-214Ag Coronation Hill 17758 1444 0.0805 0.0030 0.1046 0.005 1.1602 0.067 0.76 1209 74 641 32 782 31 47
C29-214Ah Coronation Hill 31182 2460 0.0798 0.0022 0.1103 0.006 1.2132 0.069 0.88 1193 54 674 35 807 32 43
C29-214Al Coronation Hill 18264 1445 0.0793 0.0005 0.0924 0.007 1.0097 0.078 1.00 1179 13 570 44 709 40 52
C29-214c Coronation Hill 12533 1052 0.0839 0.0002 0.0930 0.002 1.0759 0.019 0.26 1291 4 573 10 742 10 56
C29-214d Coronation Hill 21315 1789 0.0840 0.0002 0.0935 0.006 1.0826 0.066 1.00 1291 4 576 34 745 32 55
C29-214e Coronation Hill 22417 1881 0.0839 0.0002 0.0955 0.003 1.1048 0.029 1.00 1290 4 588 15 756 14 54
C29-214f Coronation Hill 59232 4955 0.0837 0.0001 0.0958 0.003 1.1053 0.037 1.00 1285 3 590 19 756 18 54
C29-214g Coronation Hill 20506 1723 0.0840 0.0002 0.0852 0.003 0.9862 0.030 1.00 1292 4 527 16 697 16 59
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