284 / 352
207
Pb
a
U
b
Pb
b
Th
b 206
Pbc
c 207
Pb
d
±2
V
206
Pb
d
±2
V
ȡ
e
207
Pb
d
±2
V
206
Pb
f
±2
V
207
Pb
f
±2
V
207
Pb
f
±2
V
Conc.
(cps) (ppm) (ppm)
U (%)
235
U (%)
238
U (%) (rho)
206
Pb (%)
238
U (Ma)
235
U (Ma)
206
Pb (Ma) (%)
Grain
s2A524 6912 283 40 0.97 0.2 0.9921 3.3 0.1145 1.6 0.48 0.0629 2.9 699 10 700 17 703 62 99
s2A560 7038 243 35 0.83 0.1 1.0190 2.3 0.1157 1.5 0.67 0.0639 1.7 706 10 714 12 739 36 95
s2A543 26493 118 29 0.39 19.3 0.9922 15.0 0.1169 2.9 0.19 0.0615 14.7 713 19 700 79 658 315 108
s3A369 2829 93 21 4.82 0.0 1.0250 3.6 0.1172 1.5 0.42 0.0635 3.3 714 10 716 19 723 69 99
s3A404 13057 391 49 0.54 0.7 1.0540 3.2 0.1194 1.4 0.44 0.0640 2.9 727 10 731 17 741 60 98
s2A580 6154 106 20 0.25 0.0 2.0240 2.2 0.1877 1.5 0.66 0.0782 1.7 1109 15 1124 15 1152 34 96
s2A584 29310 471 104 0.35 1.4 2.3100 2.5 0.2077 1.5 0.61 0.0806 2.0 1217 17 1215 18 1213 38 100
s2A571 6701 91 21 0.40 2.8 2.3310 4.1 0.2091 1.6 0.39 0.0809 3.8 1224 18 1222 30 1218 74 100
s2A525 13887 152 43 0.53 0.1 3.1700 1.8 0.2503 1.3 0.74 0.0919 1.2 1440 17 1450 14 1465 23 98
s3A375 9437 85 25 0.85 0.0 3.4750 2.1 0.2631 1.3 0.62 0.0958 1.6 1505 17 1522 17 1544 31 98
s3A402 2824 27 9 1.74 0.1 3.6750 4.4 0.2728 1.9 0.44 0.0977 3.9 1555 27 1566 36 1581 74 98
s3A358 8718 74 23 0.74 b.d.
3.8150 2.2 0.2780 1.5 0.66 0.0995 1.7 1581 20 1596 18 1615 31 98
s2A540 17329 133 54 1.13 0.1 4.5170 1.8 0.2975 1.4 0.78 0.1101 1.2 1679 21 1734 15 1801 21 93
s3A352 45475 315 107 0.66 0.0 4.6650 1.5 0.3122 1.2 0.81 0.1084 0.9 1751 19 1761 13 1772 16 99
s3A376 48438 362 119 0.69 0.0 4.7920 1.7 0.3028 1.2 0.72 0.1148 1.1 1705 18 1784 14 1876 21 91
s3A351 2946 34 12 0.34 1.1 5.3420 3.6 0.3354 1.5 0.43 0.1155 3.2 1864 25 1876 31 1888 58 99
s3A388 15029 87 32 0.61 0.0 5.5220 1.8 0.3407 1.3 0.70 0.1176 1.3 1890 21 1904 16 1919 23 98
s2A532 23672 144 53 0.37 0.0 5.6680 2.1 0.3299 1.6 0.77 0.1246 1.3 1838 26 1927 18 2023 23 91
s3A377 17180 95 42 1.50 0.0 5.8380 1.7 0.3501 1.3 0.76 0.1209 1.1 1935 21 1952 15 1970 19 98
s2A547 8738 52 22 0.80 0.0 5.9470 3.2 0.3448 2.5 0.81 0.1251 1.9 1910 42 1968 28 2030 33 94
s2A558 21563 126 59 1.05 0.1 5.9590 1.9 0.3466 1.5 0.82 0.1247 1.0 1918 25 1970 16 2024 19 95
s3A347 9520 53 22 1.01 0.0 5.9930 2.0 0.3561 1.5 0.74 0.1220 1.4 1964 26 1975 18 1986 25 99
s3A374 21700 115 50 1.36 0.0 6.0410 1.6 0.3525 1.3 0.78 0.1243 1.0 1946 21 1982 14 2019 18 96
s2A574 23702 126 61 1.17 0.4 6.0420 1.9 0.3407 1.5 0.78 0.1286 1.2 1890 25 1982 17 2079 21 91
s2A534 15047 84 33 0.44 0.6 6.0830 2.8 0.3487 1.7 0.60 0.1265 2.2 1928 28 1988 24 2050 39 94
s3A353 31340 196 77 0.76 0.0 6.1930 1.6 0.3547 1.2 0.78 0.1266 1.0 1957 21 2003 14 2052 17 95
s2A598 4080 25 12 0.97 0.0 6.1980 2.6 0.3595 1.5 0.58 0.1250 2.1 1980 26 2004 23 2029 38 98
s3A356 10418 109 44 0.82 b.d.
6.2200 2.0 0.3554 1.5 0.74 0.1270 1.3 1960 25
2007 18 2056 23 95
s2A587 38186 219 88 0.38 0.2 6.3140 1.8 0.3651 1.5 0.85 0.1254 0.9 2006 26 2020 16 2035 17 99
s2A530 29432 173 67 0.25 b.d.
6.4470 1.9 0.3673 1.6 0.88 0.1273 0.9 2017 28 2039 17 2061 16 98
s3A367 36882 181 80 1.13 0.0 6.6470 1.6 0.3689 1.3 0.83 0.1307 0.9 2024 22 2066 14 2107 15 96
s3A348 47582 236 98 0.65 0.2 7.4990 1.7 0.3768 1.4 0.80 0.1443 1.0 2061 24 2173 15 2280 18 90
s2A592 76198 287 144 0.40 0.2 9.9510 1.8 0.4377 1.6 0.88 0.1649 0.9 2340 32 2430 17 2506 14 93
s3A406 55065 183 95 0.57 0.0 10.3300 1.7 0.4684 1.4 0.81 0.1599 1.0 2476 28 2464 16 2455 17 101
s2A537 135736 427 212 0.30 0.0 10.7200 1.7 0.4412 1.6 0.92 0.1762 0.7 2356 31 2499 16 2617 11 90
s2A595 67888 216 114 0.51 0.0 10.9100 1.7 0.4468 1.5 0.90 0.1772 0.7 2381 30 2516 16 2627 12 91
s2A594 67100 221 120 0.53 0.0 11.0700 1.6 0.4600 1.4 0.89 0.1746 0.7 2440 28 2529 15 2602 12 94
s2A596 52324 180 92 0.31 0.0 11.1400 1.6 0.4597 1.3 0.85 0.1758 0.8 2438 27 2535 15 2613 14 93
s2A566 90519 683 359 0.21 b.d. 11.4100 2.2 0.4841 1.6 0.72 0.1710 1.6 2545 34 2557 21 2567 26 99
s3A379 25612 73 49 2.00 0.0 11.5100 1.7 0.4780 1.3 0.76 0.1747 1.1 2518 26 2566 16 2603 18 97
s2A548 68463 195 108 0.47 0.1 11.7500 1.6 0.4662 1.4 0.90 0.1829 0.7 2467 29 2585 15 2679 11 92
s2A577 56368 169 95 0.54 0.1 11.7800 1.8 0.4651 1.6 0.89 0.1837 0.8 2462 33 2587 17 2686 13 92
s2A565 73576 215 146 1.17 0.0 11.9300 1.6 0.4774 1.5 0.93 0.1813 0.6 2516 31 2599 15 2665 10 94
s2A586 67158 196 110 0.49 0.0 12.0100 1.6 0.4729 1.5 0.91 0.1842 0.7 2496 31 2605 15 2691 11 93
s3A396 162686 410 238 0.64 0.2 12.8800 1.8 0.5056 1.6 0.92 0.1847 0.7 2638 35 2671 17 2696 11 98
s2A522 27419 79 48 0.45 0.0 14.0100 2.1 0.5277 1.6 0.77 0.1925 1.3 2732 36 2750 20 2764 22 99
s3A365 180878 388 257 0.92 0.0 15.0300 1.5 0.5483 1.4 0.92 0.1988 0.6 2818 31 2817 14 2817 10 100
s2A568 42017 126 85 0.59 0.1 16.3200 2.1 0.5575 1.6 0.79 0.2123 1.3 2856 38 2896 20 2923 20 98
s2A555 6967 76 11 0.83 20.6 0.6318 11.9 0.0843 2.6 0.22 0.0543 11.6 522 13 497 48 385 261 136
s3A368 892 42 4 0.62 b.d.
0.7493 3.7 0.0848 1.5 0.41 0.0641 3.3 525 8 568 16 745 70 70
s2A539 2141 94 9 0.61 1.4 0.7442 5.1 0.0850 1.9 0.37 0.0635 4.7 526 9 565 22 725 99 72
s3A410 1103 42 5 1.21 b.d.
0.8553 6.2 0.0965 1.4 0.22 0.0643 6.0 594 8 628 29 751 127 79
s3A382 75
4
0 0.80 b.d.
0.9398 24.5 0.0986 4.2 0.17 0.0691 24.1 606 24 673 128 902 497 67
s3A391 4053 59 11 0.74 5.9 1.5090 6.1 0.1482 1.7 0.27 0.0739 5.8 891 14 934 38 1037 118 86
s3A401 457
7
1 0.90 0.0 2.0580 5.3 0.1545 1.8 0.34 0.0966 5.0 926 16 1135 37 1559 94 59
s3A378 47494 401 102 0.55 0.0 4.2170 2.0 0.2367 1.4 0.73 0.1292 1.4 1369 18 1677 16 2087 24 66
s3A405 160559 847 271 0.20 0.0 5.8740 1.4 0.3123 1.2 0.85 0.1364 0.7 1752 19 1957 12 2182 13 80
s2A557 325163 236 81 0.39 0.0 6.1360 1.8 0.3019 1.7 0.95 0.1474 0.6 1701 26 1995 16 2316 10 73
s2A569 48476 230 89 0.30 0.0 6.9740 2.0 0.3521 1.6 0.81 0.1437 1.2 1944 27 2108 18 2272 20 86
s2A567 50772 220 86 0.25 0.1 7.6650 2.0 0.3565 1.7 0.86 0.1559 1.0 1966 29 2193 18 2412 17 81
s2A544 104874 520 194 0.08 0.1 7.7510 2.3 0.3580 1.9 0.83 0.1570 1.3 1973 33 2203 21 2424 22 81
s2A556 42377 162 71 0.47 0.1 8.3520 1.9 0.3706 1.5 0.79 0.1635 1.2 2032 26 2270 17 2492 20 82
s2A535 56368 202 95 0.42 2.1 8.6670 2.0 0.3920 1.5 0.74 0.1604 1.4 2132 27 2304 18 2460 23 87
s2A579 96410 336 160 0.46 0.2 9.4330 1.6 0.3972 1.5 0.93 0.1722 0.6 2156 28 2381 15 2580 10 84
s2A582 91554 328 146 0.33 0.0 10.170 1.9 0.3912 1.5 0.83 0.1886 1.0 2129 28 2451 17 2730 17 78
s3A411 108130 329 172 0.46 0.0 12.670 1.7 0.4678 1.5 0.88 0.1964 0.8 2474 30 2655 16 2797 13 88
268