267 / 352
176
Yb
a
176
Lu
a
178
Hf
180
Hf Sig
Hf
b 176
Hf
176
Hf
d
ı
c
T
DM
e
age
f
ı U-Pb
g
Lu-Hf
h
177
Hf
177
Hf
177
Hf
177
Hf
(V)
177
Hf
177
Hf
(t)
İ+I (Ga) (Ma) (Ma) conc seq
İ+I
(t)
d
Grain
ı
ı
±2ı
c
A431_seq4_40 0.0137 16 0.00042 4 1.46727 1.88718 12 0.28
1001 33 0.280980
-2.4 1.2 3.09 2703 20 75 4
A432_seq4_40 0.0156 13 0.00051 3 1.46718 1.88663 17 0.282084 19 0.282079 -12.9 0.7 1.90 541 5 99 4
A433_seq4_26 0
.0056 7 0.00019 2 1.
46721 1.88633 8 0.281532 28 0.281524 1.5 1.0 2.34 2040 35 98 4
A434_seq4_40 0.0306 25 0
.00101 6 1.46721
1.88684 16 0.281575 21 0.281535 2.6 0.7 2.30 2069 20 99 4
A435_seq4_40 0
.0018 2 0.00003 0
1.46718 1.88678 14 0.281157 26 0.281155 -5.3 0.9 2.93 2310 11 90 4
A436_seq4_26 0
.0074 6 0.00024 2
1.46709 1.88634 8 0.281372 29 0.281362 -2.8 1.0 2.63 2101 31 88 4
A437_seq4_40 0.0215 18 0.00065 4 1.46721 1.88672 12 0.281441 28 0.281416 -2.8 1.0 2.56 2016 17 98 4
A438_seq4_40 0.0182 15 0.00054 3 1.46720 1.88667 17 0.282165 17 0.282155 0.7 0.6 1.55 1027 23 95 4
A444_seq4_40 0.0225 21 0.
00074 6 1.46723 1
.88686 10 0.281297 27 0.281268 -7.7 0.9 2.84 2035 17 97 5
A446_seq4_40 0.0164 23 0.00059 7 1.46724 1.88685 12 0.281586 22 0.281562 3.8 0.8 2.24 2081 22 98 5
A447_seq4_40 0.0083 7 0.00029 2 1.46718 1.88679 13 0.281027 24 0.281013 -7.2 0.8 3.15 2446 11 92 5
A448_seq4_40 0.0124 10 0.00042 3 1.46717 1.88674 14 0.281605 23 0.281598 -22.6 0.8 2.69 870 10 99 5
A453_seq4_40 0.0168 13 0.00058 4 1.46717 1.88670 11 0.282380 24 0.282374 -2.9 0.8 1.34 519 6 73 5
A456_seq4_40 0.0142 12 0.00047 3 1.46721 1.88688 14 0.281220 26 0.281202 -10.1 0.9 2.97 2030 13 92 5
A458_seq4_40 0.0336 29 0
.00107 7 1.46725
1.88713 14 0.281052 31 0.280997 -2.5 1.1 3.07 2669 17 95 5
A459_seq4_40 0.0234 23 0.
00077 6 1.46719 1
.88689 12 0.281611 23 0.281581 4.6 0.8 2.20 2082 22 97 5
A460_seq4_40 0.0144 13 0.00051 3 1.46715 1.88678 12 0.281566 20 0.281545 3.5 0.7 2.27 2091 27 97 5
A461_seq4_40 0.0232 29 0.00089 10 1.46720 1.88707 15 0.282475 30 0.282463 4.3 1.1 1.09 701 7 92 5
A462_seq4_40 0
.0076 6 0.00029 2
1.46724 1.88661 12 0.281610 21 0.281598 5.8 0.7 2.16 2112 24 92 5
A463_seq4_40 0.0256 31 0.
00084 10 1.46725 1
.88709 8 0.281191 46 0.281148 2.5 1.6 2.79 2654 10 101 5
A465_seq4_40 0
.0092 9 0.00028 2 1.
46714 1.88649 15 0.281257 23 0.281246 -8.5 0.8 2.88 2033 19 97 5
A468_seq4_40 0.0278 22 0.00089 5 1.46723 1.88674 10 0.282047 24 0.282024 4.3 0.9 1.65 1389 47 91 5
A474_seq4_40 0.0477 43 0
.00155 11 1.46718
1.88669 10 0.282227 25 0.282192 5.7 0.9 1.41 1187 48 97 5
A479_seq4_40 0.0145 16 0.00043 4 1.46717 1.88659 11 0.281082 30 0.281061 -5.0 1.1 3.04 2467 21 84 5
A482_seq4_40 0.0189 15 0.00062 4 1.46717 1.88657 13 0.281600 19 0.281576 4.0 0.7 2.22 2069 16 98 5
A483_seq4_40 0.0139 11 0.00043 3 1.46722 1.88666 11 0.282522 22 0.282518 3.0 0.8 1.04 559 7 93 5
A484_seq4_40 0.0113 9 0.00037 2 1.46717 1.88672 15 0.281050 21 0.281032 -2.1 0.7 3.02 2634 10 94 5
A485_seq4_40 0.0561 46 0
.00182 11 1.46721
1.88676 14 0.281134 26 0.281044 -2.9 0.9 3.02 2582 11 92 5
A486_seq4_40 0.0174 14 0.00055 3 1.46718 1.88653 11 0.281436 22 0.281415 -2.5 0.8 2.55 2033 32 100 5
A489_seq4_40 0.0248 21 0.00094 6 1.46721 1.88682 13 0.281617 21 0.281581 3.7 0.7 2.22 2044 21 100 5
A491_seq4_40 0.0205 18 0.
00070 5 1.46718 1
.88671 12 0.281607 20 0.281579 4.9 0.7 2.20 2103 17 96 5
A502_seq4_40 0.0146 12 0.00050 3 1.46719 1.88675 11 0.281558 26 0.281538 2.7 0.9 2.30 2066 20 97 5
A504_seq4_40 0.0134 15 0.00057 5 1.46717 1.88673 13 0.282347 19 0.282339 0.3 0.7 1.32 718 5 99 5
Quoted uncertainties (absolute) relate to the last quoted figure. The effect of the inter-element fractionation on Lu/Hf was estimated to
be about 6 % or less based on analyses of the GJ-1 and WůĞƐŽǀŝēĞ zircon. ĐĐƵƌĂĐLJ and reproducibility was checked by repeated analyses
of reference zircon GJ-1 and WůĞƐŽǀŝēĞ (data given as mean with 2 standard deviation uncertainties).
(a)
176
Yb/
177
Hf = (
176
Yb/
173
Yb)
true
x (
173
Yb/
177
Hf)
meas
x (M
173(Yb)
/M
177(Hf)
)
ɴ;,ĨͿ
, ɴ;,ĨͿ = ln((
179
Hf/
177
Hf
true
)/(
179
Hf/
177
Hf
measured
)) /
ln(M
179(Hf)
/M
177(Hf)
), M = mass of respective isotopes. The
176
Lu/
177
Hf was calculated in a similar way using
175
Lu/
177
Hf and ɴ;zďͿ.
(b)
Mean Hf signal in volts.
(c)
Uncertainties are quadratic additions of the within-run precision and the daily reproducibility of the 40ppb-JMC475 solution.
Uncertainties for the JMC475 quoted at 2SD (2 standard deviation).
(d)
Initial
176
Hf/
177
Hf and ɸ,Ĩ calculated using the apparent U-Pb age determined by > -ICP-MS dating (see column f), and the CHUR
parameters:
176
Lu/
177
Hf = 0.0336, and
176
Hf/
177
Hf = 0.282785 (Bouvier et al. 2008).
(e)
Two stage model age in Ga using measured
176
Lu/
177
Lu of each spot (first stage = age of zircon), a value of 0.0113 for the average
continental crust (second stage, values compiled from Rudnick and Gao (2003), and depleted mantle
176
Lu/
177
Lu = 0.0379, and
176
Hf/
177
Hf
= 0.283164.
(f)
ƉƉĂƌĞŶƚ U-Pb age determined by > -ICP-MS.
(g)
U-Pb age concordance (%).
(h)
Sequence in which Lu-Hf analyses were performed. Standard analyses for each sequence are showed on Table 12.
251