DV-2B K-feldspar (J = 0.000315) Total gas age = 0.68 ± 0.01 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

15.71

9.81E-04

4.42E-02

1.93E-14

5.90

16.9

1.51 ± 0.04

2

500

4.752

1.78E-03

1.23E-02

1.14E-14

9.40

23.4

0.63 ± 0.03

3

550

3.442

1.27E-03

8.95E-03

1.60E-14

14.3

23.0

0.45 ± 0.02

4

625

3.062

1.58E-03

7.37E-03

2.16E-14

20.9

28.7

0.50 ± 0.02

5

700

2.568

3.11E-03

5.65E-03

1.73E-14

26.2

34.8

0.51 ± 0.02

6

775

3.726

3.35E-03

8.66E-03

1.37E-14

30.4

31.2

0.66 ± 0.03

7

850

3.035

2.77E-03

7.12E-03

3.92E-15

31.6

30.5

0.53 ± 0.09

8

925

2.430

2.42E-03

5.05E-03

4.90E-15

33.1

38.4

0.53 ± 0.07

9

1000

2.952

1.88E-03

6.24E-03

1.05E-14

36.3

37.4

0.63 ± 0.03

10

1050

3.077

1.65E-03

6.36E-03

1.73E-14

41.6

38.7

0.68 ± 0.02

11

1080

2.738

1.34E-03

5.48E-03

1.83E-14

47.2

40.7

0.63 ± 0.02

12

1110

2.548

1.01E-03

4.60E-03

2.39E-14

54.5

46.5

0.67 ± 0.02

13

1130

2.132

7.32E-04

3.12E-03

2.16E-14

61.1

56.6

0.69 ± 0.02

14

1150

1.996

6.42E-04

2.49E-03

2.55E-14

68.9

62.9

0.71 ± 0.01

15

1175

1.901

4.73E-04

2.30E-03

3.14E-14

78.5

63.9

0.69 ± 0.01

16

1200

2.503

4.85E-04

4.45E-03

2.94E-14

87.5

47.2

0.67 ± 0.01

17

1250

1.870

2.42E-04

2.58E-03

3.17E-14

97.2

59.0

0.63 ± 0.01

18

1300

3.043

6.09E-04

6.40E-03

3.27E-15

98.2

37.7

0.65 ± 0.10

19

1500

7.220

8.52E-04

2.01E-02

5.88E-15

100

17.6

0.72 ± 0.06