323 / 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
A569 3614 273 34 1.41 0.0 0.8495 2.8 0.1027 1.3 0.48 0.0600 2.4 630 8 624 13 604 53 104
A590 2641 90 10 0.76 b.d.
0.8889 3.3 0.1034 1.7 0.51 0.0623 2.8 635 10 646 16 685 60 93
A433 3723 116 15 0.81 b.d.
1.0130 2.9 0.1149 1.4 0.50 0.0639 2.5 701 10 710 15 739 52 95
A588 58253 295 99 0.21 0.0 5.5590 1.6 0.3265 1.3 0.82 0.1235 0.9 1821 20 1910 13 2007 16 91
A422 81365 440 158 0.46 0.0 5.7050 1.4 0.3386 1.2 0.86 0.1222 0.7 1880 19 1932 12 1988 13 95
A579 22492 73 37 0.83 0.0 9.5590 1.7 0.4310 1.3 0.77 0.1609 1.1 2310 25 2393 16 2465 18 94
A572 6729 357 23 0.39 0.1 0.4962 2.6 0.0624 2.2 0.84 0.0577 1.4 390 8 409 9 516 30 76
A450 8005 391 30 0.45 0.2 0.6159 2.6 0.0750 1.3 0.49 0.0596 2.3 466 6 487 10 588 50 79
A520 6730 309 24 0.43 0.4 0.6028 3.2 0.0752 1.3 0.42 0.0582 2.9 467 6 479 12 536 63 87
A490 4023 189 14 0.38 0.0 0.6311 2.0 0.0762 1.3 0.66 0.0601 1.5 474 6 497 8 605 32 78
A500 8433 372 30 0.47 0.9 0.6390 3.2 0.0765 1.3 0.42 0.0606 2.9 475 6 502 13 626 62 76
A472 16513 1718 125 0.58 b.d.
0.6186 1.9 0.0766 1.3 0.71 0.0586 1.3 476 6 489 7 551 29 86
A413 3681 158 13 0.39 1.6 0.6449 3.9 0.0776 1.4 0.35 0.0603 3.6 482 6 505 16 615 78 78
A516 16071 227 24 0.34 12.8 0.6538 8.0 0.0789 1.8 0.23 0.0601 7.8 490 9 511 33 607 168 81
A480 3142 147 12 0.27 0.9 0.6593 3.4 0.0793 1.5 0.44 0.0603 3.1 492 7 514 14 616 66 80
A414 5841 162 14 0.37 5.1 0.6944 5.6 0.0796 1.5 0.27 0.0633 5.4 494 7 535 24 717 114 69
A427 5708 269 22 0.38 0.3 0.6842 3.0 0.0801 1.3 0.44 0.0620 2.7 496 6 529 13 674 58 74
A477 2983 130 10 0.34 0.2 0.7096 2.4 0.0801 1.4 0.58 0.0643 2.0 497 7 544 10 750 42 66
A493 5346 232 19 0.37 4.8 0.6584 7.5 0.0809 1.6 0.21 0.0590 7.3 501 8 514 31 568 159 88
A430 4310 199 17 0.38 0.5 0.7131 2.5 0.0817 1.3 0.52 0.0633 2.1 506 6 547 10 720 45 70
A523 11260 393 35 0.70 1.7 0.7626 3.1 0.0820 1.4 0.44 0.0675 2.8 508 7 576 14 852 58 60
A492 6350 277 24 0.49 0.0 0.6771 2.5 0.0824 1.3 0.53 0.0596 2.1 510 6 525 10 589 45 87
A431 5415 257 22 0.42 0.0 0.7095 2.4 0.0826 1.4 0.58 0.0623 2.0 511 7 544 10 685 42 75
A506 5424 227 19 0.40 0.5 0.7558 3.1 0.0839 1.4 0.44 0.0653 2.8 520 7 572 14 784 58 66
A499 6540 191 18 0.51 9.9 0.8210 13.1 0.0892 5.2 0.39 0.0668 12.0 551 27 609 62 830 251 66
A474 3330 141 15 1.09 0.0 0.7145 2.5 0.0905 1.4 0.54 0.0572 2.1 559 7 547 11 501 47 112
A531 7122 247 24 0.62 b.d.
0.7998 2.1 0.0931 1.3 0.64 0.0623 1.6 574 7 597 9 685 34 84
A513 30789 351 66 0.22 4.2 1.9970 3.9 0.1757 1.5 0.38 0.0825 3.6 1043 14 1115 27 1256 71 83
91500
h
8532 69 13 0.45 0.3 0.1784 3.8 1.8103 6.1 0.07 4.3867 0.6 1058 37 1049 40 1030 89 103
Felix
h
4019 203 23 1.93 0.4 0.0808 4.3 0.6109 10.3 0.05 7.7221 0.4 501 21 484 40 402 176 132
Plesovice
h
2881 1038 54 0.16 0.2 0.0549 3.8 0.4045 3.8 0.05 1.5557 0.5 344 13 345 11 348 35 99
GJ-1
h
6932 290 26 0.02 0.1 0.0984 1.1 0.8158 2.0 0.06 2.0856 0.5 605 6 606 9
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 11 (91500), 11 (Felix), 9 (Plesovice), and 26 (GJ-1) analyses, respectively.
307