318 / 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
A379 3785 463 37 0.27 b.d.
0.6220 2.9 0.0791 1.5 0.54 0.0570 2.4 491 7 491 11 492 53 100
A399 3730 459 37 0.26 0.0 0.6276 3.2 0.0792 1.6 0.49 0.0574 2.8 492 7 495 13 509 61 97
A436 3186 402 32 0.26 0.0 0.6281 2.9 0.0793 1.5 0.52 0.0575 2.5 492 7 495 11 510 54 96
A423 8523 459 43 0.26 8.4 0.6296 7.2 0.0798 1.7 0.24 0.0572 6.9 495 8 496 28 500 153 99
A435 3382 418 34 0.23 0.2 0.6303 2.9 0.0801 1.5 0.52 0.0571 2.5 497 7 496 12 494 55 101
A447 28836 1078 108 0.11 9.9 0.6422 6.4 0.0803 2.2 0.34 0.0580 6.0 498 10 504 26 529 131 94
A449 3482 371 31 0.25 0.2 0.6415 3.4 0.0812 1.5 0.44 0.0573 3.0 503 7 503 14 503 67 100
A452 6733 762 60 0.12 0.3 0.6473 2.7 0.0815 1.4 0.53 0.0576 2.3 505 7 507 11 514 51 98
A419 6675 386 31 0.18 0.2 0.6457 2.4 0.0816 1.6 0.66 0.0574 1.8 506 8 506 10 507 40 100
A444 439 16 1 0.02 2.6 0.6424 12.1 0.0562 4.3 0.35 0.0829 11.3 352 15 504 49 1267 221 28
A431 69852 1309 170 0.36 22.2 0.5345 14.6 0.0681 4.7 0.32 0.0569 13.8 425 19 435 53 489 304 87
A438 1561 12 10 0.01 36.8 113.40 32.9 0.0813 9.6 0.29 10.120 31.5 504 47 4813 401 -
-
-
A446 172 10 -
0.02 3957 -
-
-
-
-
10.120 #### -
-
-
-
-
-
-
A448
89
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A450
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
91500
h
7004 61 11 0.25 0.4 0.1794 2.1 1.8382 3.2 0.07 1.5934 0.6 1063 20 1059 21 1050 32 101
Felix
h
6572 361 52 2.08 0.4 0.0810 3.3 0.6372 3.3 0.06 2.2877 0.5 502 16 501 13 492 50 102
Plesovice
h
2310 955 49 0.08 0.1 0.0542 1.5 0.4000 1.6 0.05 1.3002 0.5 340 5 342 5 351 29 97
GJ-1
h
6697 306 28 0.03 0.2 0.0983 1.3 0.8144 2.1 0.06 2.1705 0.5 604 7 605 10
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.
302