252 / 352
207
Pb
a
U
b
Pb
b
Th
b 206
Pbc
c 207
Pb
d
±2s
206
Pb
d
±2s ȡ
e
207
Pb
d
±2s
206
Pb
f
±2s
207
Pb
f
±2s
207
Pb
f
±2s Conc.
g
(cps) (ppm) (ppm)
U (%)
235
U (%)
238
U (%) (rho)
206
Pb (%)
238
U (Ma)
235
U (Ma)
206
Pb (Ma) (%)
Grain
A236
3214 34 17 1.33 0.0 7.042 2.9 0.3880 1.6 0.54 0.1316 2.4 2114 28 2117 26 2120 43 100
A193
1897 19 9 0.90 0.0 7.655 3.6 0.4067 1.8 0.49 0.1365 3.1 2200 33 2191 33 2183 55 101
A292 105175 366 168 0.34 0.0 9.325 1.4 0.4313 1.2 0.87 0.1568 0.7 2312 24 2370 13 2421 12 95
A228 55937 197 96 0.64 0.0 9.500 1.6 0.4314 1.2 0.76 0.1597 1.1 2312 24 2388 15 2453 18 94
A279 251212 1666 810 0.42 0.1 9.928 1.3 0.4470 1.2 0.88 0.1611 0.6 2382 23 2428 12 2467 10 97
A264 111713 377 187 0.42 0.0 10.46 1.5 0.4556 1.2 0.81 0.1666 0.9 2420 25 2477 14 2523 15 96
A165 205875 697 355 0.36 0.0 10.64 1.6 0.4731 1.5 0.92 0.1631 0.6 2497 30 2492 15 2488 11 100
A225 25038 83 49 1.38 0.0 10.72 1.8 0.4597 1.3 0.71 0.1691 1.3 2438 26 2499 17 2548 22 96
A308 66606 204 104 0.47 0.1 10.80 1.4 0.4596 1.2 0.87 0.1705 0.7 2438 24 2506 13 2562 11 95
A237 153709 961 463 0.25 0.0 10.82 1.6 0.4496 1.4 0.90 0.1745 0.7 2394 28 2507 15 2601 11 92
A305 71392 211 109 0.60 0.1 10.88 1.4 0.4545 1.2 0.86 0.1736 0.7 2415 25 2513 13 2593 12 93
A340 94306 277 158 1.09 b.d.
11.11 1.5 0.4665 1.3 0.85 0.1728 0.8 2468 27 2533 14 2585 13 95
A201 82807 267 136 0.15 b.d.
11.53 1.8 0.4903 1.3 0.73 0.1706 1.2 2572 28 2567 17 2564 20 100
A258 62218 377 200 0.60 0.0 11.60 1.4 0.4665 1.2 0.85 0.1804 0.7 2468 25 2573 13 2656 12 93
A222 88144 263 144 0.59 0.0 11.68 1.5 0.4863 1.2 0.83 0.1743 0.8 2555 26 2579 14 2599 14 98
A181 48186 298 160 0.49 0.0 11.73 1.6 0.4789 1.3 0.83 0.1777 0.9 2522 28 2583 15 2631 15 96
A184 30719 84 60 1.79 0.0 13.45 1.7 0.5284 1.4 0.83 0.1846 0.9 2735 31 2712 16 2694 15 102
A280 76591 366 248 1.27 b.d.
14.05 1.5 0.5326 1.3 0.90 0.1914 0.6 2753 29 2753 14 2754 11 100
A213 65275 145 95 0.69 0.0 16.61 1.6 0.5566 1.3 0.84 0.2165 0.9 2852 31 2913 16 2955 14 97
A274
1451 140 13 0.58 b.d.
0.7658 3.1 0.08760 1.4 0.46 0.06340 2.8 541 8 577 14 722 59 75
A293
1208 49 8 3.50 0.0 0.8266 4.7 0.09498 1.5 0.32 0.06312 4.5 585 8 612 22 712 95 82
A269 51083 252 86 0.70 31.4 0.9346 8.3 0.1052 3.5 0.43 0.06445 7.5 645 22 670 42 756 159 85
A294
257 6
1 0.18 3.1 0.7704 16.4 0.1642 3.0 0.18 0.03403 16.1 980 27 580 75 -788 457 -124
A175 60325 523 150 0.88 b.d.
4.050 1.9 0.2550 1.5 0.83 0.1152 1.0 1464 20 1644 15 1883 19 78
A272 24707 162 54 0.65 0.0 5.133 1.7 0.2982 1.3 0.77 0.1248 1.1 1683 19 1842 15 2026 19 83
A180 30835 353 241 1.43 1.0 5.150 5.8 0.7185 4.2 0.72 0.0520 4.0 3490 113 1844 50 285 91 1226
A324 64275 624 222 0.73 0.2 6.482 1.8 0.3011 1.3 0.73 0.1561 1.2 1697 19 2043 16 2414 21 70
A188 152087 505 242 0.94 0.4 9.748 1.9 0.3994 1.7 0.92 0.1770 0.8 2166 32 2411 18 2625 13 83
A221 37253 119 56 0.58 0.0 9.865 1.6 0.4045 1.4 0.85 0.1769 0.9 2190 26 2422 15 2624 15 83
91500
h
8532 69 13 0.45 0.3 1.853 3.8 0.1791 2.4 0.61 0.07503 3.1 1062 23 1064 25 1069 63 99
Felix
h
4019 203 23 1.93 0.4 0.6208 6.4 0.08063 3.9 0.48 0.05583 3.4 500 19 490 25 445 75 113
Plesovice
h
2881 1038 54 0.16 0.2 0.4045 3.8 0.05489 3.8 0.53 0.05345 1.6 344 13 345 11 348 35 99
206
Pb/
238
U error is the quadratic additions of the within run precision (2 SE) and the external reproducibility (2 SD) of the reference zircon.
207
Pb/
206
Pb error propagation
(
207
Pb signal dependent) following Gerdes & Zeh (2009).
207
Pb/
235
U error is the quadratic addition of the
207
Pb/
206
Pb and
206
Pb/
238
U uncertainty.
a
Within run background-correctedmean
207
Pb signal in cps (counts per second).
b
U and Pb content and Th/U ratio were calculated relative to GJ-1 reference zircon.
c
Percentage of the common Pb on the
206
Pb. b.d. = below detection limit.
d
Pb/U and Pb/Pb ratios. Corrected for background, within-run Pb/U fractionation (in case of
206
Pb/
238
U) and common Pb using Stacy and Kramers (1975) model Pb
composition and subsequently normalised to GJ-1 (ID-TIMS value/measured value);
207
Pb/
235
U calculated using ((
207
Pb/
206
Pb)*(
238
U/
206
Pb)*137.88).
e
ZŚŽ ;ʌͿ ŝƐ ƚŚĞ ;
206
Pb/
238
U)/(
207
Pb/
235
U) error correlation coefficient.
f
Pb/U and Pb/Pb ages.
g
Degree of concordance = ((
206
Pb/
238
U age)/(
207
Pb/
206
Pb age)) x 100.
h
Mean of 13 (91500), 13 (Felix), 9 (Plesovice), and 23 (GJ-1) analyses, respectively.
236