Table 1 SIMS and LA–ICPMS zircon U–Pb isotopic data for sample D4-2-3.

From: Jurassic zircons from the Southwest Indian Ridge

Sample/

Element (ppm)

Th/U

Isotopic ratios

Ages(Ma)

spot #

U

Th

206 Pb/ 204 Pb

1σ (%)

207 Pb/ 235 U

1σ (%)

206 Pb/ 238 U

1σ (%)

1σ

SIMS

 01#1

920

1168

1.27

1745

1.5

0.19496

3.0

0.0284

1.5

180.8

2.7

 04A#1

759

403

0.53

934

1.6

0.19157

4.4

0.0295

1.6

187.7

3.0

 07B#1

1398

1205

0.86

2990

0.8

0.19493

2.2

0.0282

1.5

179.2

2.7

 07D#1

331

265

0.80

28742

1.2

0.19019

2.0

0.0279

1.6

177.5

2.7

LA-ICPMS

   

207Pb/206Pb

       

 #1

1305

1552

0.86

0.05616

4.4

0.20831

4.4

0.0269

1.1

171.2

1.9

 #2

1371

1569

1.15

0.04871

4.2

0.18779

4.1

0.0282

1.2

179.2

2.1

 #3

2083

2306

1.23

0.04719

3.6

0.17972

3.5

0.0277

0.9

176.2

1.6

 #4

1033

1187

1.87

0.05486

5.0

0.21281

4.9

0.0282

1.4

179.4

2.5

 #5

2735

1921

1.49

0.05069

2.9

0.20002

3.0

0.0284

0.9

180.7

1.6

 #6

3068

3307

1.72

0.04933

3.2

0.19278

3.1

0.0283

0.9

179.7

1.6

 #7

1411

1612

0.48

0.04538

5.2

0.18195

5.1

0.0290

1.0

184.3

1.9

 #8

1319

1573

1.47

0.04932

4.5

0.19028

4.3

0.0281

1.1

178.6

1.9

 #9

1468

1694

1.90

0.05148

3.8

0.20016

3.8

0.0282

0.9

179.0

1.6

 #10

1347

1664

1.99

0.05052

3.9

0.19713

4.0

0.0282

1.2

179.6

2.1

 #11

2060

1517

0.50

0.05141

3.4

0.20104

3.4

0.0283

1.0

179.7

1.7

 #12

2061

2430

1.79

0.04916

3.5

0.19152

3.5

0.0281

1.0

178.8

1.7

 #13

2339

2508

0.39

0.05137

3.1

0.20100

3.2

0.0282

1.0

179.5

1.8

 #14

1438

1697

0.24

0.05382

3.4

0.21414

3.5

0.0287

1.0

182.3

1.8

 #15

965

1176

1.41

0.05186

4.2

0.20120

4.1

0.0282

1.1

179.1

1.9

 #16

3157

3967

1.51

0.05066

2.5

0.19724

2.5

0.0281

0.8

179.0

1.4

 #17

1118

1458

1.90

0.05681

4.3

0.21436

4.3

0.0276

1.3

175.2

2.2

 #18

1570

1935

0.76

0.04947

4.1

0.18982

4.0

0.0280

1.0

178.0

1.8

 #19

1440

1401

0.81

0.04689

4.1

0.18826

4.1

0.0293

1.0

185.8

1.9

 #20

1506

1722

1.10

0.05134

3.6

0.19526

3.5

0.0276

1.0

175.4

1.8

 #21

1642

1689

1.85

0.04809

3.6

0.19787

3.7

0.0297

1.0

188.9

1.8

 #22

883

1015

1.53

0.05071

5.0

0.19793

4.8

0.0286

1.2

181.7

2.1

 #23

1489

1854

0.96

0.04902

3.9

0.19267

3.8

0.0286

1.1

181.5

1.9

 #24

1072

800

1.16

0.05036

4.8

0.19845

4.8

0.0289

1.2

183.8

2.2

 #25

1412

1647

1.00

0.05081

4.4

0.19927

4.3

0.0287

1.1

182.7

2.0

 #26

1585

1332

0.81

0.04937

3.7

0.19695

3.7

0.0289

1.0

183.7

1.9

 #27

1155

1060

1.29

0.05028

4.0

0.19689

4.1

0.0286

1.3

181.5

2.2

 #28

1039

1213

1.27

0.05351

4.1

0.20882

4.1

0.0283

1.2

179.9

2.1

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