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Earth, Planets and Space

Table 1 Parameters of apatite (U–Th–Sm)/He dating

From: (U–Th)/He thermochronometric mapping across the northeast Japan Arc: towards understanding mountain building in an island-arc setting

Sample code

(A02-)

Lab. No.

He No.

No. of grains analyzed

[4He] (ncc)

Mass

(mg)

aMean FT

[U]

(ppm)

[Th]

(ppm)

[Sm]

(ppm)

Th/U

b[eU]

(ppm)

Corrected age ± 1σ

(Ma)

Grain length

(µm)

Grain half width

(μm)

cMWAR

dSD

eGrain morphology

FST03

12344

38465

1

0.028

0.0030

0.69

7.9

23.4

311.7

2.95

14.8

8.0 ± 0.5 g

138.0

46.5

–

–

0T

FST03

12345

38468

1

0.030

0.0019

0.65

14.4

24.0

200.8

1.66

20.9

10.1 ± 0.6 g

114.5

40.3

–

–

0T

FST03

12466

38746

2

0.027

0.0037

0.66

19.8

47.8

231.7

2.41

32.1

2.9 ± 0.2

147.3

–

42.7

3.4

2 × 1T

FST03

12467

38749

3

0.023

0.0047

0.62

7.1

17.3

191.9

2.42

12.0

5.7 ± 0.4 g

137.3

–

36.3

3.8

2T, 1T, 0T

FST03

20085

65971

1

0.017

0.0016

0.62

25.1

40.7

141.1

1.62

35.3

4.1 ± 0.3

131.9

34.6

–

–

0T

FST03

20087

65977

1

0.112

0.0016

0.62

4.3

13.2

121.6

3.06

7.9

121.8 ± 7.6 g

118.2

36.8

–

–

0T

FST03

20434

67790

1

0.025

0.0043

0.74

13.5

22.8

181.1

1.68

19.7

3.4 ± 0.2

131.0

57.4

–

–

0T

FST03

20435

67793

1

0.013

0.0034

0.71

10.3

24.1

182.1

2.35

16.8

2.8 ± 0.2

120.9

52.8

–

–

0T

Weighted mean age ± 95% CI 3.2 ± 0.2

FST04

12347

38474

1

0.072

0.0029

0.69

30.7

24.7

210.8

0.80

37.4

8.1 ± 0.5

169.4

41.1

–

–

0T

FST04

12348

38477

1

0.084

0.0026

0.67

20.2

15.5

185.6

0.77

24.7

16.5 ± 1.0

173.3

42.5

–

–

2T

FST04

12349

38480

1

0.024

0.0028

0.67

26.0

20.7

205.9

0.80

31.8

3.4 ± 0.2

187.0

42.5

–

–

2T

FST04

12350

38483

1

0.040

0.0037

0.72

17.6

18.5

172.6

1.05

22.7

5.6 ± 0.3

165.8

46.9

–

–

0T

FST04

20088

65980

1

0.046

0.0049

0.74

23.3

26.2

171.7

1.12

30.2

3.6 ± 0.2

194.5

49.9

–

–

0T

FST04

20089

65983

1

0.207

0.0048

0.74

35.7

29.2

171.4

0.82

43.3

11.3 ± 0.7

198.6

48.8

–

–

0T

FST04

20090

65986

1

0.124

0.0032

0.72

63.8

57.9

414.1

0.91

79.3

5.7 ± 0.4

200.3

47.8

–

–

1T

FST04

20437

67799

1

0.075

0.0051

0.75

12.6

14.9

125.0

1.18

16.7

9.9 ± 0.6

139.1

60.2

–

–

0T

FST04

20438

67802

1

0.103

0.0035

0.71

21.9

22.1

157.1

1.01

27.8

12.6 ± 0.8

186.2

43.1

–

–

0T

FST04

20439

67805

1

0.051

0.0029

0.70

20.2

23.2

166.1

1.15

26.4

7.9 ± 0.5

135.7

46.3

–

–

0T

Weighted mean age ± 95% CI N/A

FST05

12352

38489

1

0.030

0.0031

0.67

7.4

23.9

282.0

3.24

14.3

8.8 ± 0.5 g

162.9

47.8

–

–

2T

FST05

12354

38495

1

0.104

0.0058

0.74

5.5

12.7

302.4

2.32

9.9

22.6 ± 1.4 g

195.0

59.6

–

–

2T

FST05

12469

38755

2

0.029

0.0047

0.67

8.0

19.5

261.8

2.42

13.8

5.7 ± 0.4

149.7

–

44.2

4.9

1T,0T

FST05

12470

38758

2

0.062

0.0071

0.73

16.9

29.1

228.8

1.72

24.8

4.1 ± 0.3

138.5

–

52.0

11.5

1T, 0T

FST05

12471

38761

2

0.034

0.0102

0.77

2.3

15.7

242.5

6.87

7.1

5.6 ± 0.3

167.6

–

68.4

12.1

2 × 1T

Weighted mean age ± 95% CI 4.9 ± 0.8

FST06

12355

38498

1

0.046

0.0029

0.71

25.7

19.4

173.1

0.75

31.0

6.1 ± 0.4

196.0

45.8

–

–

1T

FST06

12356

38501

1

0.062

0.0072

0.72

9.6

4.8

125.7

0.49

11.3

9.0 ±0.6 g

184.6

43.6

–

–

0T

FST06

12357

38504

1

0.074

0.0040

0.73

32.1

24.2

158.2

0.75

38.5

5.4 ± 0.3

183.7

46.7

–

–

0T

FST06

12472

38764

2

0.053

0.0048

0.67

16.1

11.2

152.1

0.70

19.4

7.2 ± 0.4

148.0

–

44.1

0.6

2 × 2T

FST06

12473

38767

2

0.071

0.0084

0.72

13.0

7.0

139.9

0.54

15.3

6.4 ± 0.4

198.0

–

49.2

9.7

2 × 2T

Weighted mean age ± 95% CI 6.2 ± 0.6

FST07

12359

38510

1

1.307

0.0040

0.77

37.1

10.9

476.1

0.29

41.8

85.1 ± 5.3

162.8

63.5

–

–

1T

FST07

12360

38513

1

1.767

0.0078

0.78

22.7

8.6

298.9

0.38

26.1

93.7 ± 5.8

198.0

68.9

–

–

2T

FST07

12361

38770

1

2.625

0.0069

0.81

40.5

14.2

481.0

0.35

46.0

87.2 ± 5.4

204.4

72.9

–

–

1T

FST07

12362

38773

1

0.772

0.0029

0.73

30.4

10.6

450.8

0.35

35.0

89.3 ± 5.5

181.7

48.4

–

–

1T

Weighted mean age ± 95% CI 88.6 ± 8.8

FST08

12363

38776

1

0.770

0.0068

0.76

19.2

28.5

148.7

1.49

26.6

46.7 ± 2.9

217.1

61.6

–

–

2T

FST08

12364

38779

1

0.374

0.0043

0.71

16.7

22.6

144.3

1.35

22.7

45.3 ± 2.8

211.8

49.4

–

–

2T

FST08

12365

38782

1

0.504

0.0052

0.73

19.8

25.9

138.5

1.31

26.5

42.1 ± 2.6

204.4

55.1

–

–

2T

FST08

12366

38785

1

0.932

0.0084

0.78

20.0

33.9

162.6

1.70

28.7

41.4 ± 2.6

188.4

73.3

–

–

2T

Weighted mean age ± 95% CI 43.7 ± 4.3

FST09

12367

38788

1

0.113

0.0050

0.74

3.6

7.0

72.9

1.98

5.6

47.5 ± 2.9

178.2

52.8

–

–

0T

FST09

12368

38791

1

0.370

0.0088

0.81

6.5

13.9

211.0

2.12

10.7

42.1 ± 2.6

207.9

83.4

–

–

1T

FST09

12369

38794

1

0.153

0.0056

0.75

3.9

8.4

76.0

2.16

6.2

50.7 ± 3.1

190.7

53.9

–

–

0T

FST09

12370

38797

1

0.457

0.0186

0.84

3.6

8.5

72.8

2.32

5.9

42.1 ± 2.6

220.7

91.6

–

–

0T

Weighted mean age ± 95% CI 43.7 ± 4.3

FST10

12372

38803

1

0.024

0.0069

0.75

15.7

76.6

128.4

4.87

34.2

1.1 ± 0.1

209.8

63.1

–

–

2T

FST10

12575

38923

6

0.035

0.0204

0.69

12.1

25.5

92.2

2.11

18.5

1.1 ± 0.1

187.6

–

46.3

4.4

6 × 2T

FST10

12577

38929

6

0.041

0.0293

0.72

13.7

28.2

103.4

2.06

20.8

0.8 ± 0.0

211.2

–

51.8

6.2

6 × 2T

Weighted mean age ± 95% CI 0.9 ± 0.1

FST11

12579

38935

3

0.197

0.0038

0.75

75.8

74.6

423.8

0.98

95.2

6.1 ± 0.4

169.4

–

52.8

5.8

1 × 1T, 2 × 0T

FST11

12580

38938

3

0.155

0.0066

0.75

46.3

64.6

317.0

1.40

62.9

4.2 ± 0.3

232.9

–

55.2

14.0

2 × 2T, 1 × 1T

FST11

12581

38941

3

0.210

0.0052

0.75

76.6

42.8

287.7

0.56

87.9

5.1 ± 0.3

174.3

–

52.9

6.5

3 × 2T

FST11

12582

38944

3

0.197

0.0048

0.74

62.5

64.7

350.3

1.04

79.3

5.9 ± 0.4

164.3

–

56.7

6.2

2 × 2T, 1 × 1T

Weighted mean age ± 95% CI 5.1 ± 0.5

FST12

12583

38947

3

0.033

0.0035

0.75

19.5

30.5

502.5

1.56

28.9

3.7 ± 0.2

157.1

–

55.1

4.8

2 × 2T, 1 × 1T

FST12

12584

38950

3

0.045

0.0071

0.76

12.9

25.1

447.9

1.94

20.8

3.5 ± 0.2

218.7

–

66.7

4.1

2 × 2T, 1 × 0T

FST12

12585

38953

3

0.033

0.0036

0.68

19.5

36.7

643.1

1.88

31.0

3.8 ± 0.2

221.5

–

51.6

8.1

2 × 2T, 1 × 1T

FST12

12586

38956

3

0.039

0.0055

0.73

15.0

26.1

454.8

1.74

23.2

3.6 ± 0.2

214.6

–

55.9

1.3

3 × 2T

Weighted mean age ± 95% CI 3.7 ± 0.4

Sample code

Lab. No.

He No.

[4He] (ncc)

aMean FT

Th/U

Corrected age ± 1σ (Ma)

Durango Apatite standard

DUR

19768

65523

13.135

1.00

16.12

31.0 ± 1.9

DUR

19771

65853

4.985

1.00

22.28

32.3 ± 2.0

DUR

19772

65856

3.567

1.00

16.24

31.6 ± 2.0

DUR

19769

65632

2.817

1.00

21.85

31.8 ± 2.0

DUR

20105

66181

5.189

1.00

23.32

31.7 ± 2.0

DUR

20177

66291

18.420

1.00

22.29

30.0 ± 1.9

DUR

20430

67632

8.440

1.00

19.32

31.8 ± 2.0

DUR

20473

67838

2.725

1.00

16.33

31.8 ± 2.0

Reference agef ± 1σ 32.1 ± 1.7

  1. N/A denotes a weighted mean age was not adopt because of a poor reproducibility
  2. aFT is the a-ejection correction after Farley et al. (1996)—calculated using mass-weighted radius, where more than one grain was analyzed
  3. bEffective uranium content (U ppm + 0.234 * Th ppm + 0.0046 * Sm ppm) (Gastil et al. 1967)
  4. cMWAR is the mass-weighted average radius of apatite crystals analyzed
  5. dStandard deviation of the MWAR is used as a guide for the ‘tightness’ of the range of single crystal radii picked within a sample
  6. eGrain morphology: 0T = no crystal terminations, 1T = one crystal termination and 2T = two crystal terminations (Brown et al. 2013)
  7. fReference age for Durango apatite after McDowell et al. (2005)
  8. gGrain age is regarded as an outlier
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