301 / 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
A316_seq5_40 0.0127 12 0.00040 3 1.46720 1.88686 12 0.282017 24 0.282010 -5.5 0.8 1.86 978 12 102 5
A317_seq5_40 0.0160 13 0.00052 3 1.46719 1.88706 13 0.281551 25 0.281545 -31.7 0.9 2.92 548 8 102 5
A318_seq5_40 0.0140 11 0.00044 3 1.46719 1.88690 14 0.282060 24 0.282050 1.3 0.8 1.68 1215 30 99 5
A319_seq5_40 0.0262 37 0.
00084 10 1.46724 1.
88698 14 0.282658 24 0.282649 7.9 0.8 0.78 570 8 102 5
A322_seq5_26 0.0374 34 0
.00127 9 1.46706
1.88641 7 0.281848 36 0.281811 -0.3 1.3 2.01 1518 28 97 5
A323_seq5_26 0.0638 80 0
.00214 22 1.46713 1
.88631 6 0.282455 33 0.282425 4.0 1.2 1.14 747 10 103 5
A324_seq5_26 0.0248 20 0.00093 7 1.46707 1.88652 8 0.282297 35 0.282288 -5.3 1.2 1.49 549 7 94 5
A326_seq5_40 0.0282 38 0.
00098 12 1.46722 1.
88674 13 0.282678 25 0.282669 7.3 0.9 0.76 510 7 96 5
A327_seq5_40 0.0397 33 0
.00116 8 1.46715
1.88660 13 0.281664 41 0.281619 5.5 1.5 2.14 2064 79 104 5
A333_seq5_40 0.0195 16 0.00053 3 1.46713 1.88651 13 0.281913 23 0.281899 0.5 0.8 1.88 1418 33 105 5
A338_seq5_26 0.0246 25 0.00092 7 1.46719 1.88625 9 0.281687 70 0.281678 -26.9 2.5 2.66 551 7 98 5
A339_seq5_26 0.0403 36 0
.00124 9 1.46713
1.88607 7 0.282308 29 0.282294 -3.8 1.0 1.46 606 9 102 5
A340_seq5_40 0.0254 28 0.00090 9 1.46716 1.88684 10 0.282690 20 0.282681 8.4 0.7 0.73 542 7 99 5
A341_seq5_40 0.0168 16 0.00053 4 1.46715 1.88658 14 0.282444 20 0.282438 0.9 0.7 1.18 591 9 98 5
A342_seq5_40 0
.0056 4 0.00016 1 1
.46719 1.88672 16 0.281167 23 0.281159 -2.3 0.8 2.87 2433 17 100 5
A344_seq5_40 0.0462 38 0
.00142 9 1.46715
1.88660 17 0.282249 23 0.282231 -4.8 0.8 1.56 664 8 103 5
A345_seq5_26 0.0191 17 0.00061 4 1.46712 1.88685 5 0.281043 33 0.281012 -2.1 1.2 3.05 2666 11 100 5
A346_seq5_40 0.0618 57 0
.00187 14 1.46724
1.88690 11 0.282315 27 0.282296 -5.3 1.0 1.48 540 7 101 5
A347_seq5_26 0.0246 22 0.00083 6 1.46715 1.88658 6 0.281611 30 0.281576 7.1 1.1 2.16 2200 31 100 5
A349_seq5_40 0.0257 23 0.00082 6 1.46715 1.88653 12 0.282690 25 0.282681 8.5 0.9 0.72 546 7 100 5
A351_seq5_40 0.0546 67 0
.00201 21 1.46720
1.88664 10 0.281680 24 0.281607 1.2 0.9 2.24 1897 116 98 5
A353_seq5_40 0.0137 11 0.00043 3 1.46721 1.88674 14 0.281290 21 0.281275 -12.7 0.7 2.93 1805 22 95 5
A354_seq5_40 0.0276 30 0
.00102 10 1.46719
1.88678 11 0.282410 21 0.282399 -1.0 0.7 1.27 568 20 107 5
A356_seq5_26 0.0211 19 0.
00071 5 1.46718 1.
88666 6 0.282387 35 0.282379 -0.7 1.2 1.29 613 8 97 5
A357_seq5_26 0
.0095 10 0.00033 3
1.46710 1.88615 8 0.281866 37 0.281863 -20.3 1.3 2.31 555 7 98 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-ϭ ĂŶĚ WůĞƐŽǀŝēĞ njŝƌĐŽŶ͘ ĐĐƵƌĂĐLJ ĂŶĚ ƌĞƉƌŽĚƵĐŝďŝůŝƚLJ ǁĂƐ ĐŚĞĐŬĞĚ ďLJ ƌĞƉĞĂƚĞĚ ĂŶĂůLJƐĞƐ ŽĨ ƌĞĨĞƌĞŶĐĞ njircon GJ-ϭ ĂŶĚ 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 с ůŶ;;
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
,Ĩ ĂŶĚ ɴ;zďͿ͘
(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
,Ĩ ĂŶĚ ɸ,Ĩ ĐĂůĐƵůĂƚĞĚ ƵƐŝŶŐ ƚŚĞ ĂƉƉĂƌĞŶƚ h-Pb age determined by LA-ICP-MSdating (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)
Apparent U-Pb age determined by LA-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.
285