263 / 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
A451_seq1_40 0.0193 16 0.00065 4 1.46716 1.88654 10 0.282656 30 0.282649 7.7 1.1 0.78 561 9 96 5
A455_seq1_40 0.0348 29 0
.00133 9 1.46722
1.88684 12 0.281717 22 0.281663 8.1 0.8 2.03 2109 22 100 5
A457_seq1_40 0.0549 45 0
.00176 11 1.46721
1.88705 12 0.282322 37 0.282301 -3.2 1.3 1.44 625 9 100 5
A459_seq1_40 0.0216 18 0.00087 6 1.46714 1.88659 12 0.282357 21 0.282348 -3.0 0.7 1.37 557 9 97 5
A460_seq1_40 0.0181 15 0.00065 4 1.46718 1.88676 13 0.281604 21 0.281578 5.1 0.7 2.20 2113 17 100 5
A461_seq1_40 0.0147 12 0.00051 3 1.46719 1.88666 13 0.281402 21 0.281382 -3.8 0.8 2.62 2027 15 95 5
A462_seq1_40 0
.0093 8 0.00029 2 1.
46718 1.88662 12 0.282017 24 0.282012 -6.2 0.9 1.86 947 17 99 5
A465_seq1_40 0.0162 17 0.00056 5 1.46720 1.88687 12 0.281597 26 0.281575 4.8 0.9 2.21 2103 26 100 5
A467_seq1_40 0.0206 17 0.
00079 5 1.46716 1
.88671 13 0.282275 21 0.282268 -6.9 0.8 1.55 510 7 98 5
A468_seq1_40 0
.0091 7 0.00027 2 1.
46720 1.88658 16 0.28
1007 23 0.280995
-12.0 0.8 3.27 2265 11 91 5
A469_seq1_40 0.0100 8 0.00033 2 1.46718 1.88654 12 0.281321 21 0.281308 -5.8 0.7 2.75 2055 23 100 5
A470_seq1_40 0.0239 19 0.00081 5 1.46721 1.88674 14 0.282656 25 0.282648 6.9 0.9 0.80 528 7 100 5
A471_seq1_40 0.0108 9 0.00035 2 1.46718 1.88667 13 0.281019 28 0.281001 -3.5 1.0 3.09 2623 15 98 5
A472_seq1_40 0.0560 45 0
.00183 11 1.46723
1.88667 10 0.282338 21 0.282319 -4.2 0.8 1.43 548 9 99 5
A476_seq1_40 0.0394 33 0
.00145 9 1.46724
1.88678 11 0.281663 26 0.281606 4.7 0.9 2.17 2050 16 100 5
A477_seq1_40 0.0100 8 0.00033 2 1.46723 1.88678 12 0.281047 22 0.281031 -2.2 0.8 3.03 2633 16 99 5
A479_seq1_40 0.0299 28 0.00097 7 1.46718 1.88668 11 0.281487 27 0.281449 -1.8 1.0 2.50 2009 22 100 5
A480_seq1_40 0
.0094 8 0.00033 2 1.
46719 1.88678 14 0.281062 19 0.281046 -3.1 0.7 3.02 2571 12 100 5
A483_seq1_26 0.0219 19 0.
00074 5 1.46714 1
.88651 7 0.281052 23 0.281016 -4.2 0.8 3.09 2568 15 99 5
A484_seq1_26 0.0245 26 0.00081 7 1.46711 1.88621 6 0.281089 29 0.281049 -2.2 1.0 3.00 2607 12 99 5
A485_seq1_40 0.0138 11 0.00046 3 1.46723 1.88667 12 0.281349 18 0.281332 -6.2 0.7 2.73 2000 24 100 5
A486_seq1_40 0.0185 16 0.00059 4 1.46716 1.88645 11 0.282359 22 0.282352 -2.6 0.8 1.36 570 10 100 5
A487_seq1_40 0.0154 19 0.00054 6 1.46719 1.88661 11 0.281606 24 0.281585 4.2 0.8 2.21 2063 19 99 5
A488_seq1_40 0.0340 33 0
.00111 9 1.46723
1.88695 15 0.281113 20 0.281058 -2.1 0.7 2.99 2595 10 101 5
A489_seq1_40 0.0275 35 0.
00084 10 1.46719 1
.88675 13 0.281089 25 0.281047 -2.5 0.9 3.01 2594 13 100 5
A490_seq1_40 0.0135 11 0.00043 3 1.46717 1.88661 14 0.282572 22 0.282567 4.4 0.8 0.95 543 9 99 5
A491_seq1_40 0.0344 30 0
.00121 8 1.46717
1.88650 12 0.281607 20 0.281560 2.8 0.7 2.27 2039 25 100 5
A492_seq1_40 0
.0095 8 0.00029 2 1.
46722 1.88677 12 0.281951 26 0.281943 4.3 0.9 1.75 1513 25 100 5
A493_seq1_40 0.0241 22 0.00084 6 1.46713 1.88622 6 0.282258 33 0.282246 -2.7 1.2 1.50 732 11 100 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.
247