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Earth, Planets and Space

Table 1 ZDD data summary

From: Multi-method constraints on the age and timescale of silicic small-volume eruptions of Puketerata Volcanic Complex, Taupō Volcanic Zone, New Zealand

Sample

232Th

 ± 

238U

 ± 

147Sm

 ± 

4He

 ± 

TAU

Th/U

Raw He

 ± 1σ

Ft

 ± 

Ft.-cor. He

 ± 1σ

U-Th

 ± 1σ

D230

Diseq.-cor

 ± 1σ

code

(ng)

(%)

(ng)

(%)

(ng)

(%)

(ncc)

(%)

(%)

 

age (ka)

(ka)

 

(%)

age (ka)

(ka)

(ka)

(ka)

 

He age (ka BP)

(ka)

NZ-19

 NZ19-1

0.486

1.9

0.576

2.4

0.00026

1.4

0.0004

39.7

39.8

0.84

4.8

1.9

0.69

5

7.0

2.8

28.2

5.2

0.1698

11.6

4.8

 NZ19-2

0.886

1.3

0.974

2.0

0.00026

1.9

0.0007

15.7

15.8

0.90

4.8

0.8

0.73

5

6.6

1.1

30.4

4.5

0.1831

10.7

1.8

 NZ19-3

1.162

1.3

1.044

1.9

0.00010

1.9

0.0006

30.0

30.0

1.11

4.1

1.2

0.66

5

6.1

1.9

17.1

4.9

0.2240

9.8

3.2

 NZ19-4

0.383

1.9

0.546

2.4

0.00060

1.4

0.0005

23.9

24.0

0.70

6.9

1.7

0.70

5

9.9

2.4

25.4

5.6

0.1410

18.3

4.6

 NZ19-7

0.221

1.4

0.306

2.0

0.00010

2.2

0.0002

79.8

79.8

0.72

4.6

3.7

0.68

5

6.8

5.5

23.9

5.0

0.1449

11.6

9.9

 NZ19-12*

0.267

1.4

0.291

1.9

0.00008

1.7

0.0010

15.0

15.1

0.91

22.3

3.4

0.61

5

36.3

5.8

45.8

18.6

0.1843

  

 NZ19-15

0.464

1.3

0.471

1.9

0.00040

1.3

0.0003

32.0

32.0

0.98

4.9

1.6

0.74

5

6.6

2.1

21.4

5.5

0.1983

10.9

3.7

         

Weighted mean (in ka BP) ± 95% conf. (in ka) (MSWD):

 

11.3 ± 2.6 (0.54)

NZ-20

 NZ20-17

2.234

1.3

1.857

1.9

0.00052

0.9

0.0016

10.7

10.8

1.19

5.6

0.6

0.74

5

7.6

0.9

77.8

18

0.2399

9.8

1.3

 NZ20-16

0.715

1.9

0.725

2.4

0.00016

1.7

0.0007

15.9

16.0

0.98

6.8

1.1

0.72

5

9.4

1.6

145

39

0.1967

10.9

2.0

 NZ20-1

0.714

1.3

0.744

2.0

0.00007

2.1

0.0005

35.6

35.7

0.95

4.8

1.7

0.57

10

8.5

3.1

18.4

3.8

0.1913

14.2

5.6

 NZ20-3

0.475

1.3

0.516

1.9

0.00017

1.7

0.0004

39.8

39.8

0.91

5.8

2.3

0.65

5

8.9

3.6

32.4

8.2

0.1835

14.0

5.9

 NZ20-4

0.677

1.9

0.574

2.4

0.00031

1.3

0.0006

23.0

23.1

1.17

6.5

1.5

0.66

5

9.8

2.3

31

6.8

0.2351

14.9

3.7

 NZ20-5

0.459

1.3

0.526

2.0

0.00044

0.7

0.0006

31.6

31.7

0.87

7.1

2.3

0.73

5

9.8

3.2

108

15

0.1741

12.0

4.0

 NZ20-7

0.573

1.3

0.672

2.0

0.00020

1.8

0.0004

29.2

29.2

0.85

4.2

1.2

0.68

5

6.2

1.8

19.8

5.2

0.1701

10.9

3.4

 NZ20-8

0.507

2.0

0.867

2.4

0.00009

2.1

0.0009

15.7

15.9

0.58

7.2

1.1

0.72

5

10.0

1.7

53.6

11

0.1165

15.9

2.9

         

Weighted mean (in ka BP) ± 95% conf. (in ka) (MSWD):

 

11.3 ± 1.7 (0.76)

  1. Ft—alpha ejection correction factor calculated after Farley et al. (1996) for homogeneous distribution of parent nuclides; uncertainty on Ft factors was arbitrarily set to 5% and 10% for crystals with Ft ≥ 0.6 and Ft < 0.6, respectively, after Ehlers and Farley (2003) and propagated in quadrature into final age uncertainty; D230—Th zircon-melt fractionation factor calculated after (Farley et al. 2002) using the Th/U ratios of analyzed bulk zircon crystals and whole rock Th/U (NZ-19 = 4.9356; NZ-20 = 4.9793); Diseq.-cor. (U-Th)/He age (ka)—disequilibrium corrected (U-Th)/He age calculated by MCHeCalc program (Schmitt et al. 2010) assuming D231 = 3.3 (i.e., an average of ƒPa/U values published by Schmitt 2007, 2011; Sakata et al. 2017); Eruption ages were calculated as error weighted average by Isoplot 4.15 Excel add-in (Ludwig 2012). Crystal marked with asterisk was disregarded because its (U-Th)/He date is older than the youngest U-Th age. For more details see Supplementary table 1
  2. TAU total analytical uncertainty
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