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Table 3 Summary of apatite (U–Th–Sm)/He analytical data

From: First report of (U–Th)/He thermochronometric data across Northeast Japan Arc: implications for the long-term inelastic deformation

Sample

Lab. no

He no.

No. of grains analyzed

[4He]

(ncc)

Mass

(mg)

aMean F T

[U]

(ppm)

[Th]

(ppm)

[Sm]

(ppm)

Th/U

b[eU]

(ppm)

Corrected age ± 1σ

(Ma)

Grain length

(μm)

cGrain radius

(μm)

dGrain morphology

A02-ST01

10297

30458

1

0.538

0.0044

0.75

20.2

26.8

151.7

1.33

26.5

50.1 ± 3.1

204.4

56.3

1T

A02-ST01

10294

30627

1

0.455

0.0047

0.71

16.3

24.3

135.3

1.49

22.0

50.6 ± 3.1

237.9

48.6

2T

A02-ST01

10295

30630

1

0.647

0.0063

0.72

17.1

29.3

155.7

1.71

24.0

48.5 ± 3.0

302.4

49.9

2T

A02-ST01

10296

30633

1

0.547

0.0041

0.74

23.0

27.8

151.2

1.21

29.5

49.4 ± 3.1

205.6

54.0

1T

          

Weighted mean age ± 95% CI

49.6 ± 3.0

   

A02ST02

14733

47678

1

1.130

0.0059

0.78

31.5

2.2

271.7

0.07

32.0

62.1 ± 3.8

158.0

67.2

2T

A02ST02

14734

47681

1

0.449

0.0038

0.75

21.3

2.3

248.1

0.11

21.8

58.4 ± 3.6

141.3

51.8

0T

A02ST02

14735

47684

1

0.827

0.0036

0.73

34.0

3.6

274.1

0.11

34.8

72.1 ± 4.5

143.9

55.2

2T

A02ST02

14736

47687

1

0.545

0.0039

0.74

21.9

2.8

193.2

0.13

22.6

67.9 ± 4.2

157.0

54.8

2T

          

Weighted mean age ± 95% CI

64.3 ± 9.5

   

A02-ST03

10298

30461

1

0.334

0.0046

0.70

12.2

20.1

173.7

1.65

16.9

49.9 ± 3.1

240.0

47.8

2T

A02-ST03

10299

30464

1

0.560

0.0029

0.69

6.4

15.0

143.2

2.34

9.9

e224.8 ± 13.9

151.1

43.7

0T

A02-ST03

10300

30467

1

1.097

0.0094

0.80

10.3

18.3

182.9

1.78

14.6

79.8 ± 4.9

268.2

71.8

1T

A02-ST03

10301

30470

1

0.230

0.0021

0.63

20.6

20.9

170.8

1.01

25.5

55.6 ± 3.5

160.8

39.4

2T

A02-ST03

15680

51164

1

0.220

0.0045

0.74

5.7

14.0

133.9

2.46

9.0

59.1 ± 3.7

128.5

59.1

2T

A02-ST03

15681

51167

1

0.459

0.0019

0.66

29.6

20.2

158.1

0.68

34.3

86.5 ± 5.4

107.1

42.0

2T

A02-ST03

15682

51170

1

0.450

0.0028

0.70

17.4

25.5

183.0

1.47

23.4

78.7 ± 4.9

124.5

47.6

2T

          

Weighted mean age ± 95% CI

63 ± 15

   

A02-ST04

10302

30473

1

0.158

0.0085

0.79

11.0

26.0

214.8

2.36

17.1

11.1 ± 0.7

176.3

69.4

0T

A02-ST04

10303

30476

1

0.053

0.0058

0.76

9.3

16.0

194.0

1.72

13.1

e7.5 ± 0.5

155.9

60.9

0T

A02-ST04

10305

30482

1

0.031

0.0032

0.70

6.2

18.0

253.2

2.90

10.4

10.4 ± 0.6

153.3

45.8

0T

A02-ST04

10363

30663

2

0.052

0.0007

0.72

49.8

78.7

1420.0

1.58

68.3

12.6 ± 0.8

119.0

51.6

0T, 0T

A02-ST04

10364

30666

2

0.067

0.0073

0.71

7.3

8.6

142.3

1.18

9.3

11.0 ± 0.7

185.5

45.6

0T, 0T

          

Weighted mean age ± 95% CI

11.2 ± 1.4

   

A02-ST05

10306

30485

1

0.027

0.0047

0.72

38.3

25.0

159.0

0.65

44.2

1.5 ± 0.1

223.6

50.1

2T

A02-ST05

10307

30488

1

0.038

0.0083

0.77

28.0

20.0

138.5

0.71

32.7

1.5 ± 0.1

251.8

62.9

2T

A02-ST05

10308

30491

1

0.024

0.0046

0.72

30.4

28.5

198.4

0.94

37.1

1.6 ± 0.1

203.5

52.4

2T

A02-ST05

10309

30494

1

0.033

0.0048

0.72

47.7

35.9

203.8

0.75

56.1

1.4 ± 0.1

226.1

50.4

2T

          

Weighted mean age ± 95% CI

1.5 ± 0.1

   

A02-ST06

10310

30497

1

0.043

0.0036

0.70

48.7

84.9

470.9

1.74

68.7

2.1 ± 0.1

161.1

51.6

2T

A02-ST06

10360

30654

1

0.020

0.0034

0.73

14.0

37.3

589.3

2.66

22.8

2.8 ± 0.2

172.8

54.5

1T

A02-ST06

10361

30657

1

0.058

0.0040

0.71

5.4

14.1

150.6

2.61

8.7

e18.6 ± 1.2

135.1

54.2

0T

A02-ST06

15685

51179

1

0.053

0.0027

0.72

6.8

4.7

190.5

0.69

7.9

e27.8 ± 1.7

153.7

52.0

1T

A02-ST06

15915

51501

2

0.022

0.0071

0.74

6.9

10.7

192.1

1.55

9.4

3.5 ± 0.2

184.1

51.9

1T, 1T

          

Weighted mean age ± 95% CI

2.5 ± 1.7

   

A02-ST07

10314

30509

1

0.078

0.0076

0.78

8.4

11.5

97.4

1.37

11.1

9.6 ± 0.6

182.7

64.4

0T

A02-ST07

10315

30512

1

0.234

0.0065

0.78

26.6

44.6

225.3

1.68

37.1

10.2 ± 0.6

242.4

62.3

1T

A02-ST07

10316

30515

1

0.111

0.0050

0.74

15.5

31.7

117.5

2.05

22.9

10.6 ± 0.7

173.6

53.6

0T

A02-ST07

10317

30518

1

0.055

0.0046

0.74

8.1

16.3

146.7

2.01

11.9

10.8 ± 0.7

231.6

53.3

1T

          

Weighted mean age ± 95% CI

10.3 ± 0.6

   

A02-ST08

10318

30521

1

0.043

0.0042

0.70

12.8

22.5

197.2

1.76

18.1

6.5 ± 0.4

223.5

47.8

2T

A02-ST08

10319

30524

1

0.042

0.0038

0.73

12.9

22.9

201.7

1.78

18.3

6.6 ± 0.4

216.8

50.1

1T

A02-ST08

10320

30527

1

0.059

0.0040

0.72

14.6

29.0

251.9

1.99

21.4

7.7 ± 0.5

245.1

47.6

1T

A02-ST08

10321

30642

1

0.032

0.0045

0.72

8.7

15.1

154.1

1.74

12.2

6.5 ± 0.4

191.8

53.1

2T

          

Weighted mean age ± 95% CI

6.8 ± 0.9

   

A02-ST09

10322

30537

1

0.055

0.0022

0.68

21.7

29.6

275.9

1.36

28.7

10.3 ± 0.6

166.3

44.1

1T

A02-ST09

10323

30540

1

0.030

0.0010

0.55

26.1

37.7

500.5

1.44

35.0

12.1 ± 0.8

105.8

34.5

2T

A02-ST09

10325

30546

1

0.034

0.0024

0.68

10.6

21.3

183.6

2.01

15.6

11.0 ± 0.7

114.5

45.5

0T

A02-ST09

10378

30690

2

0.023

0.0037

0.62

6.1

18.8

187.6

3.08

10.5

e7.7 ± 0.5

136.8

36.7

0T, 0T

          

Weighted mean age ± 95% CI

11.1 ± 2.3

   

A02ST12

14741

47702

1

0.126

0.0067

0.77

13.1

14.7

134.8

1.12

16.6

12.0 ± 0.7

210.1

56.2

0T

A02ST12

14742

47705

1

0.193

0.0049

0.77

16.0

4.6

109.0

0.29

17.1

e24.4 ± 1.5

132.8

60.8

0T

A02ST12

14743

47708

1

0.245

0.0096

0.81

20.1

7.9

135.6

0.39

22.0

11.8 ± 0.7

207.3

67.8

0T

A02ST12

14744

47711

1

0.213

0.0090

0.81

21.2

5.6

110.5

0.26

22.5

10.6 ± 0.7

174.0

71.7

0T

          

Weighted mean age ± 95% CI

11.4 ± 0.8

   

A02-ST13

10326

30549

1

0.041

0.0071

0.77

3.9

7.8

223.0

2.00

5.7

e10.4 ± 0.6

146.2

69.3

0T

A02-ST13

10327

30552

1

0.084

0.0090

0.78

13.5

23.9

433.8

1.77

19.1

5.0 ± 0.3

250.8

59.6

0T

A02-ST13

10328

30555

1

0.067

0.0035

0.73

33.4

42.6

408.2

1.28

43.4

5.0 ± 0.3

195.0

51.1

1T

A02-ST13

10329

30558

1

0.093

0.0089

0.79

14.0

19.2

463.8

1.37

18.5

5.7 ± 0.4

211.3

64.9

0T

          

Weighted mean age ± 95% CI

5.2 ± 0.9

   

A02-ST15

10330

30561

1

0.086

0.0034

0.74

15.4

51.0

353.1

3.31

27.4

10.1 ± 0.6

148.4

61.6

1T

A02-ST15

10331

30564

1

0.054

0.0057

0.75

5.9

22.5

220.9

3.81

11.2

9.1 ± 0.6

148.4

61.6

0T

A02-ST15

10332

30567

1

0.073

0.0021

0.65

11.3

39.2

280.6

3.47

20.5

e21.4 ± 1.3

174.0

41.1

1T

A02-ST15

10379

30693

2

0.064

0.0054

0.68

7.6

26.6

215.2

3.50

13.9

10.1 ± 0.6

118.6

47.8

0T, 0T

          

Weighted mean age ± 95% CI

9.7 ± 0.7

   

Durango apatite standard

               

Durango

10337

30455

3.937

1.00

15.81

31.2 ± 1.9

Durango

10359

30621

9.678

1.00

15.59

31.7 ± 2.0

Durango

10381

30699

9.738

1.00

17.09

33.8 ± 2.1

          

Weighted mean age ± 95% CI

32.2 ± 2.3

   
          

fReference age ± 1σ:

32.1 ± 1.7

   
  1. The weighted mean ages and the errors were obtained using Isoplot ver. 4.15 (Ludwig 2012)
  2. aFT is α-ejection correction after Farley et al. (1996)
  3. bEffective uranium concentration, weights U and Th for their alpha productivity, computed as [U] + 0.235[Th] (Shuster et al. 2006)
  4. cMass-weighted average radius is adopted for multi-grain analysis
  5. dCrystal morphology: 2T = idiomorphic whole grain, 1T = broken crystal with 1 termination, 0T = broken grains with no terminations (Brown et al. 2013)
  6. eAnalysis not included in weighted mean age calculation
  7. fThe reference age of Durango apatite is from McDowell et al. (2005)