288 / 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.
g
(cps) (ppm) (ppm)
U (%)
235
U (%)
238
U (%) (rho)
206
Pb (%)
238
U (Ma)
235
U (Ma)
206
Pb (Ma) (%)
Grain
A127 16465 32 21 0.52 0.1 17.5300 1.8 0.5731 1.5 0.81 0.2218 1.1 2921 35 2964 18 2994 17 98
A031 24930 41 27 0.51 0.2 17.8300 2.0 0.5850 1.6 0.81 0.2210 1.2 2969 38 2981 19 2988 19 99
A024 19833 695 59 0.09 0.0 0.7636 2.6 0.0900 1.4 0.52 0.0615 2.2 555 7 576 12 658 48 84
A095 1182 40 4 0.89 0.0 1.0120 5.6 0.0982 1.6 0.28 0.0747 5.4 604 9 710 29 1061 108 57
A119 20676 160 29 0.91 15.2 1.6000 11.3 0.1238 2.1 0.18 0.0937 11.1 752 15 970 73 1503 210 50
A100 6316 138 31 0.50 0.0 2.9510 2.5 0.2095 1.7 0.66 0.1021 1.9 1226 19 1395 19 1663 35 74
A064 4738 28 7 0.50 0.2 4.0360 2.7 0.2228 1.9 0.69 0.1314 2.0 1297 22 1642 22 2117 34 61
A057 12017 179 47 0.39 b.d.
4.2350 2.0 0.2499 1.6 0.79 0.1229 1.2 1438 21 1681 17 1999 22 72
A193 5783 85 28 0.79 b.d.
4.9790 2.9 0.2864 2.1 0.70 0.1261 2.1 1624 30 1816 25 2044 37 79
A187 19247 129 44 0.91 0.4 5.0280 2.4 0.2904 1.6 0.67 0.1256 1.8 1644 23 1824 21 2037 32 81
A132 15019 87 32 1.02 b.d.
5.2350 2.1 0.3086 1.6 0.74 0.1230 1.4 1734 24 1858 18 2001 26 87
A131 19589 237 73 0.11 b.d.
5.2510 2.0 0.3097 1.6 0.79 0.1230 1.3 1739 24 1861 17 2000 22 87
A043 149737 1349 404 0.07 0.0 6.1250 2.0 0.2965 1.8 0.92 0.1498 0.8 1674 27 1994 17 2344 13 71
A027 121806 917 276 0.16 0.1 6.4550 2.1 0.2879 2.0 0.94 0.1626 0.7 1631 28 2040 19 2483 12 66
A176 81646 398 131 0.17 b.d.
6.8290 3.2 0.3165 2.6 0.80 0.1565 1.9 1773 40 2090 29 2418 32 73
A140 80810 356 114 0.13 0.1 6.9700 1.8 0.3103 1.5 0.82 0.1629 1.1 1742 23 2108 17 2486 18 70
A110 54764 471 180 0.38 b.d.
7.1810 1.5 0.3566 1.3 0.89 0.1461 0.7 1966 22 2134 13 2300 12 85
A080 21664 172 71 0.78 0.0 7.5800 2.0 0.3542 1.6 0.80 0.1552 1.2 1954 27 2183 18 2404 20 81
A029 124541 892 326 0.06 0.0 7.7980 1.8 0.3605 1.7 0.91 0.1569 0.8 1984 28 2208 17 2422 13 82
A041 58326 214 86 0.29 0.0 8.0080 2.3 0.3824 2.1 0.94 0.1519 0.8 2088 38 2232 21 2367 14 88
A129 23482 78 36 0.54 b.d.
9.7930 1.8 0.4126 1.4 0.79 0.1721 1.1 2227 27 2416 17 2579 19 86
A047 171938 439 191 0.19 0.3 10.120 1.5 0.4081 1.4 0.90 0.1799 0.7 2206 26 2446 14 2652 11 83
A019 25582 72 35 1.24 0.1 10.140 2.4 0.3733 2.2 0.91 0.1970 1.0 2045 38 2447 22 2801 16 73
A093 64490 401 176 0.17 b.d.
10.210 1.9 0.4173 1.5 0.80 0.1774 1.1 2248 28 2454 17 2629 19 86
91500
h
8676 77 14 0.44 0.3 1.8408 3.8 0.1792 3.3 0.56 0.0745 1.9 1062 32 1060 25 1055 38 101
Felix
h
8886 509 76 3.98 0.1 0.6348 6.8 0.0807 7.3 0.50 0.0571 1.2 500 35 499 27 494 26 101
Plesovice
h
2366 866 45 0.15 0.4 0.3935 2.3 0.0539 1.7 0.47 0.0529 2.3 339 6 337 7 326 52 104
GJ-1
h
7647 340 31 0.02 0.1 0.8142 1.8 0.0984 0.9 0.42 0.0600 1.6 605 5 605 8
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-corrected mean
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 9 (91500), 9 (Felix), 9 (Plesovice), and 18 (GJ-1) analyses, respectively.
272