serie NOVA TERRA nº 48

176

178

180

Hf Sig

b 176

176

age

ı U-Pb

Lu-Hf

177

(V)

177

(t)

İ+I (Ga) (Ma) (Ma) conc seq

İ+I

(t)

Grain

±2ı

A279_seq2_26 0.0305 27 0

.00101 7 1.46711

1.88642 7 0.281052 28 0.281001 -2.7 1.0 3.07 2656 21 97 2

A280_seq2_26 0.0251 27 0.00088 8 1.46707 1.88635 5 0.282408 44 0.282379 24.6 1.6 0.79 1723 124 31 2

A281_seq2_40 0.0128 11 0.00042 3 1.46716 1.88658 13 0.281269 20 0.281252 -8.3 0.7 2.87 2030 15 99 2

A282_seq2_26 0.0141 14 0.00045 4 1.46712 1.88637 6 0.280704 32 0.280681 -13.8 1.1 3.69 2668 18 94 2

A288_seq2_26 0.0329 48 0

.00102 13 1.46712

1.88636 6 0.281094 33 0.281044 -2.5 1.2 3.02 2598 14 100 2

A289_seq2_26 0.0256 26 0.00092 8 1.46711 1.88662 7 0.281614 32 0.281579 2.4 1.1 2.25 1992 23 95 2

A290_seq2_40 0.0241 20 0.

00076 5 1.46714 1.

88678 14 0.282550 25 0.282543 3.0 0.9 1.01 518 11 96 2

A291_seq2_26 0.0610 57 0

.00200 15 1.46714

1.88649 6 0.282677 33 0.282657 7.0 1.2 0.78 517 8 97 2

A292_seq2_26 0.0264 21 0.00084 5 1.46712 1.88659 8 0.281056 28 0.281015 -5.0 1.0 3.10 2538 14 93 2

A293_seq2_26 0.0097 8 0.00036 2 1.46711 1.88642 7 0.281517 27 0.281503 1.1 0.9 2.37 2054 17 96 2

A294_seq2_26 0

.0018 2 0.00007 0

1.46708 1.88636 21 0.281401 17 0.281400 -38.2 0.6 3.21 484 9 98 2

A296_seq2_26 0.0195 33 0.

00071 11 1.46719

1.88664 6 0.281596 24 0.281568 3.2 0.8 2.25 2044 20 99 2

A297_seq2_40 0.0110 9 0.00036 2 1.46723 1.88905 12 0.281328 134 0.281314 -6.7 4.8 2.76 2004 29 97 2

A298_seq2_40 0.0166 15 0.00054 4 1.46719 1.88676 12 0.281095 28 0.281095 -59.7 1.0 3.94 -

A299_seq2_26 0.0256 27 0.00084 8 1.46713 1.88654 6 0.281085 25 0.281042 -0.1 0.9 2.97 2704 20 100 2

A300_seq2_40 0.0155 14 0.00048 4 1.46720 1.88681 13 0.282355 21 0.282350 -3.7 0.7 1.38 524 10 98 2

A301_seq2_40 0.0217 18 0.00080 5 1.46720 1.88676 10 0.281658 25 0.281627 4.9 0.9 2.14 2026 28 98 2

A304_seq2_26 0.0171 14 0.00055 3 1.46709 1.88655 5 0.281038 34 0.281010 -2.6 1.2 3.06 2644 13 93 2

A305_seq2_40 0.0187 15 0.00061 4 1.46716 1.88659 12 0.281084 19 0.281054 -1.3 0.7 2.98 2635 18 99 2

A306_seq2_26 0.0111 10 0.00041 3 1.46714 1.88658 6 0.280975 30 0.280953 -1.7 1.1 3.11 2770 12 92 2

A307_seq2_26 0.0550 45 0

.00178 11 1.46713

1.88641 8 0.281090 27 0.280999 -2.4 1.0 3.07 2672 14 100 2

A308_seq2_40 0.0178 15 0.00060 4 1.46721 1.88676 13 0.281958 21 0.281952 -17.8 0.7 2.15 526 8 99 2

A311_seq2_26 0.0300 28 0

.00106 8 1.46715

1.88644 7 0.280967 34 0.280906 2.2 1.2 3.09 3007 11 98 2

A313_seq2_26 0.0138 18 0.00052 6 1.46710 1.88662 7 0.282325 26 0.282318 -0.4 0.9 1.36 724 10 94 2

A315_seq2_40 0.0097 8 0.00030 2 1.46717 1.88683 13 0.281023 25 0.281008 -2.6 0.9 3.06 2648 16 96 2

A317_seq2_40 0

.0094 8 0.00033 2 1

.46718 1.88686 13 0.281576 22 0.281563 3.1 0.8 2.26 2049 26 96 2

A319_seq2_40 0.0346 29 0

.00106 7 1.46715

1.88696 12 0.282504 25 0.282493 1.1 0.9 1.11 513 8 100 2

A320_seq2_26 0.0192 17 0.00065 5 1.46715 1.88656 5 0.281558 29 0.281533 0.7 1.0 2.34 1992 27 98 2

A324_seq2_26 0

.0074 10 0.00020

3 1.46714 1.88675 6 0.281654 133 0.281652 -31.2 4.7 2.77 401 6 96 2

A325_seq2_26 0

.0075 6 0.00023 1

1.46712 1.88656 7 0.281182 37 0.281173 -11.6 1.3 3.03 2013 30 98 2

A326_seq2_26 0

.0092 8 0.00035 2 1

.46718 1.88671 6 0.282328 36 0.282325 -4.8 1.3 1.43 515 7 99 2

A327_seq2_26 0.0202 19 0.00067 5 1.46715 1.88666 7 0.281006 30 0.280972 -4.1 1.1 3.14 2640 10 99 2

A333_seq2_40 0.0234 26 0.00081 8 1.46720 1.88681 11 0.281610 29 0.281578 3.6 1.0 2.23 2046 36 93 2

A334_seq2_40 0.0349 34 0

.00109 9 1.46720

1.88688 12 0.282698 24 0.282688 7.7 0.9 0.73 500 8 98 2

A335_seq2_40 0.0680 57 0

.00212 14 1.46716 1

.88656 14 0.282475 17 0.282455 -0.2 0.6 1.18 513 8 100 2

A336_seq2_26 0.0319 27 0

.00100 7 1.46714

1.88648 8 0.282379 25 0.282370 -3.4 0.9 1.35 508 8 102 2

A338_seq2_40 0.0189 15 0.00066 4 1.46717 1.88686 13 0.281620 24 0.281594 4.6 0.8 2.19 2066 26 97 2

A342_seq2_26 0.0228 25 0.00064 6 1.46719 1.88677 5 0.281084 28 0.281051 -0.3 1.0 2.96 2682 11 97 2

A344_seq2_40 0.0277 23 0.00085 5 1.46716 1.88682 12 0.282528 19 0.282519 3.6 0.7 1.03 585 10 99 2

A345_seq2_40 0

.0070 7 0.00022 2

1.46720 1.88696 12 0.281067 26 0.281056 -2.2 0.9 3.00 2593 19 79 2

A347_seq2_40 0.0223 19 0.00069 5 1.46720 1.88684 11 0.281182 23 0.281149 -0.6 0.8 2.85 2521 17 90 2

A348_seq2_26 0.0372 55 0

.00116 16 1.46715

1.88620 6 0.281627 30 0.281581 3.8 1.1 2.22 2051 11 97 2

A354_seq2_26 0.0110 12 0.00036 3 1.46714 1.88644 6 0.281008 31 0.280990 -4.5 1.1 3.12 2598 12 92 2

A355_seq2_26 0.0278 30 0

.00100 10 1.46712

1.88652 6 0.282293 29 0.282280 -2.0 1.0 1.44 711 10 99 2

A357_seq2_26 0.0208 24 0.00067 7 1.46705 1.88628 6 0.281040 24 0.281006 -2.9 0.9 3.07 2639 14 99 2

A360_seq2_40 0.0132 11 0.00050 3 1.46719 1.88675 12 0.281057 23 0.281032 -4.3 0.8 3.07 2538 11 91 2

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)

177(Hf)

)

ɴ;,ĨͿ

͕ ɴ;,ĨͿ с ůŶ;;

179

Hf/

177

true

)/(

179

Hf/

177

measured

)) / ln(M

179(Hf)

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.

277