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Table 6 Zircon U–Pb data

From: The Theodul Glacier Unit, a slab of pre-Alpine rocks in the Alpine meta-ophiolite of Zermatt-Saas, Western Alps

Properties

Weight µg

U ppm

Th/U

Pbc pg

206/204

207/235 abs

2 σ

206/238

2 σ abs

rho

207/206

2σ abs

206/238 Ma

2 σ abs

207/235 Ma

2 σ abs

207/206

2 σ abs

Disc  %

(a)

(b)

(b)

(c)

(d)

(e)

(f)

(f)

(f)

(f)

(f)

(f)

(f)

(f)

(f)

(f)

(f)

(f)

(f)

 

Z sp [1]

1

406

0.41

0.7

1607

0.32095

0.00197

0.044239

0.000134

0.63

0.05262

0.00025

279.1

0.8

282.6

1.5

312.4

11.0

10.9

Z eq sbr [1]

8

266

0.49

1.2

4729

0.30898

0.00094

0.043071

0.000090

0.78

0.05203

0.00010

271.8

0.6

273.4

0.7

286.7

4.3

5.3

Z eq sbr-an [1]

2

1108

0.45

0.7

7803

0.30006

0.00128

0.041944

0.000160

0.93

0.05188

0.00008

264.9

1.0

266.4

1.0

280.3

3.6

5.6

Z eq sp [1]

5

169

0.48

2.4

922

0.29227

0.00212

0.040928

0.000083

0.47

0.05179

0.00034

258.6

0.5

260.3

1.7

276.2

14.9

6.5

Z eq sbr [8]

1

1494

0.43

0.9

4101

0.28710

0.00131

0.040394

0.000142

0.86

0.05155

0.00012

255.3

0.9

256.3

1.0

265.4

5.4

3.9

Z eq an [1]

9

210

0.44

1.1

4385

0.28123

0.00091

0.039515

0.000084

0.75

0.05162

0.00011

249.8

0.5

251.6

0.7

268.5

4.9

7.1

Zslp-fr cloudy [1]

10

379

0.60

2.6

2980

0.22602

0.00078

0.032233

0.000073

0.76

0.05086

0.00012

204.5

0.5

206.9

0.6

234.3

5.2

12.9

Z eu sp cloudy [1]

13

235

0.57

1.0

5213

0.19878

0.00055

0.028413

0.000055

0.80

0.05074

0.00009

180.6

0.3

184.1

0.5

229.1

3.9

21.5

Z tip cloudy [1]

1

503

0.47

5.5

159

0.17242

0.00436

0.024368

0.000090

0.39

0.0513

0.0012

155.2

0.6

161.5

3.8

255.1

54.5

39.6

  1. (a) All zircon grains treated with chemical abrasion (Mattinson 2005); eq = equamt; sp = short-prismatic; sbr = subrounded; an = anhedral: fr = fragment [1] = number of grains
  2. (b) Weight and concentrations are known to better than 10%, except those of about 1 µg know to about 50%
  3. (c) Th/U model ratio inferred from 208/206 ratio and age of sample
  4. (d) Pbc = total common Pb in sample (initial + blank)
  5. (e) Raw data, corrected for fractionation and spike
  6. (f) Corrected for fractionation, spike, blank (206/204 = 18.3; 207/204 = 15.555) and initial common Pb (based on Stacey and Kramers 1975); error calculated by propagating the main sources of uncertainty