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Table Ig4-Hf
Lu, Yb and Hf LA-MC-ICPMS data of zircon crystals from sample GCH-19
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
A10_40_seq1 0
.0051 4 0.00023 1 1
.46722 1.88681 10 0.282856 30 0.282856 2.5 1.1 0.61 0 0 0 1
A11_40_seq1 0
.0072 8 0.00036 3
1.46719 1.88666 11 0.282881 24 0.282881 3.4 0.9 0.56 0 0 No data 1
A12_40_seq1 0
.0092 7 0.00047 3 1
.46717 1.88675 14 0.282809 22 0.282805 11.5 0.8 0.51 485 11 91 1
A14_40_seq1 0
.0071 6 0.00032 2
1.46721 1.88685 10 0.282865 25 0.282860 21.0 0.9 0.25 820 393 58 1
A16_40_seq1 0.0100 9 0.00050 4 1.46714 1.88678 11 0.282873 25 0.282868 13.6 0.9 0.38 477 24 105 1
A21_40_seq1 0
.0041 3 0.00020 1 1
.46717 1.88673 10 0.282842 20 0.282842 2.0 0.7 0.63 0 0 0 1
A22_40_seq1 0.0129 10 0.00058 4 1.46719 1.88659 13 0.282701 20 0.282695 7.9 0.7 0.72 498 12 93 1
A24_40_seq1 0.0246 26 0
.00122 11 1.46716
1.88672 11 0.282820 26 0.282810 10.8 0.9 0.51 443 10 102 1
A26_40_seq1 0
.0074 7 0.00038 3
1.46714 1.88667 11 0.282862 25 0.282862 2.7 0.9 0.60 0 0 0 1
A29_40_seq1 0.0088 7 0.00041 2 1.46709 1.88649 11 0.282820 22 0.282816 11.8 0.8 0.49 481 12 96 1
A32_40_seq1 0.0096 8 0.00050 3 1.46718 1.88670 10 0.282859 26 0.282855 12.0 0.9 0.43 426 10 92 1
A39_40_seq1 0.0124 17 0.00065 7 1.46719 1.88688 11 0.282808 22 0.282802 11.5 0.8 0.51 490 8 91 1
A43_40_seq1 0.0240 21 0.00097 7 1.46714 1.88658 11 0.282692 21 0.282683 6.2 0.8 0.75 439 11 90 1
A45_40_seq1 0.0161 13 0.00082 5 1.46713 1.88681 16 0.282866 23 0.282858 13.6 0.8 0.40 492 9 96 1
A55_40_seq1 0
.0060 6 0.00031 3 1
.46717 1.88674 12 0.282845 22 0.282842 11.4 0.8 0.46 421 7 98 1
A74_40_seq1 0
.0078 8 0.00037 3
1.46713 1.88684 12 0.282859 22 0.282856 13.7 0.8 0.40 503 12 96 1
A92_40_seq1 0.0156 13 0.
00078 5 1.46716 1.
88672 10 0.282806 27 0.282800 9.5 1.0 0.55 402 8 95 1
A97_40_seq1 0
.0064 5 0.00032 2 1
.46717 1.88665 10 0.282840 24 0.282830 36.5 0.8 -0.04 1546 ### 30 1
A503_40_seq1 0.0183 15 0.00098 6 1.46721 1.88696 10 0.282840 26 0.282832 10.5 0.9 0.49 397 10 96 1
A508_40_seq1 0.0211 18 0
.00112 7 1.46721
1.88675 11 0.282825 25 0.282814 12.4 0.9 0.48 508 30 100 1
A509_40_seq1 0
.0054 5 0.00024 2 1
.46718 1.88664 11 0.282846 25 0.282844 11.9 0.9 0.45 442 36 90 1
İ+I
(t)
d
Grain
ı
ı
±2ı
c
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.
324