316 / 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
A583 6266 315 18 0.00 0.5 0.4827 2.3 0.0640 1.6 0.69 0.0547 1.7 400 6 400 8 401 38 100
A562 6844 322 19 0.01 0.0 0.4841 2.0 0.0642 1.6 0.79 0.0547 1.2 401 6 401 7 401 27 100
A536 10991 532 31 0.00 0.3 0.4840 2.2 0.0642 1.6 0.75 0.0547 1.4 401 6 401 7 399 32 100
A546 6227 295 17 0.01 0.2 0.4855 2.3 0.0643 1.6 0.70 0.0548 1.6 401 6 402 8 404 36 99
A538 11235 541 32 0.00 0.0 0.4857 1.9 0.0643 1.3 0.69 0.0548 1.4 402 5 402 6 402 30 100
A571 7715 383 23 0.00 0.0 0.4879 2.2 0.0646 1.7 0.77 0.0548 1.4 404 7 403 7 403 31 100
A525 8446 398 24 0.00 0.1 0.4876 2.3 0.0646 1.8 0.78 0.0548 1.4 404 7 403 8 402 32 100
A519 12534 634 38 0.00 0.1 0.4886 2.0 0.0647 1.4 0.71 0.0548 1.4 404 6 404 7 404 31 100
A556 7402 334 20 0.00 1.2 0.4884 3.0 0.0647 1.5 0.51 0.0548 2.5 404 6 404 10 403 57 100
A520 9728 452 27 0.00 0.1 0.4981 2.2 0.0657 1.7 0.77 0.0550 1.4 410 7 410 8 412 32 100
A07
206 6
1 0.12 9.1 0.5794 16.4 0.0732 4.2 0.25 0.0574 15.9 455 18 464 63 508 349 90
A555 42836 411 42 0.00 21.3 0.5772 9.6 0.0732 2.6 0.27 0.0572 9.3 456 12 463 36 498 204 92
A09
775 27 2 0.22 6.6 0.5873 10.2 0.0755 2.2 0.21 0.0564 9.9 469 10 469 39 469 220 100
A06
949 14 2 0.43 16.3 0.6061 12.1 0.0776 3.8 0.32 0.0567 11.5 482 18 481 47 478 253 101
A08
-680 5
0 0.16 4.2 1.6240 -
0.0608 19.4 -
0.1936 -
381 72 980 -
2773 -
14
91500
h
8378 74 13 0.29 0.5 0.1795 1.4 1.8499 1.8 0.07 0.9148 0.5 1064 14 1063 12 1062 18 100
Felix
h
12482 435 68 2.47 0.2 0.0821 3.0 0.6484 3.0 0.06 2.9654 0.4 509 15 507 12 502 65 102
Plesovice
h
2852 651 34 0.09 1.3 0.0542 2.2 0.3989 4.1 0.05 2.8587 0.5 340 7 341 12 345 64 99
GJ-1
h
9719 290 27 0.04 0.1 0.0984 1.2 0.8151 2.4 0.06 2.2245 0.5 605 7 605 11
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 13 (91500), 13 (Felix), 13 (Plesovice), and 26(GJ-1) analyses, respectively.
300