95-6-12(b) Plagioclase (J = 0.00866) Total gas age = 15.99 ± 0.10 Ma

step

T

(°C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

500

4.596

1.68E-02

1.22E-02

1.15E-13

2.09

20.9

15.0 ± 0.2

2

550

1.205

4.18E-02

1.24E-03

1.51E-13

4.85

67.8

12.7 ± 0.1

3

600

2.091

1.17E-01

3.07E-03

1.46E-13

7.51

55.8

18.1 ± 0.1

4

650

2.580

1.56E-01

3.80E-03

1.38E-13

10.0

56.0

22.4 ± 0.1

5

700

2.487

1.33E-01

3.19E-03

1.27E-13

12.3

61.4

23.7 ± 0.1

6

750

2.414

1.28E-01

3.29E-03

1.21E-13

14.6

59.1

22.2 ± 0.2

7

800

2.221

9.78E-02

3.13E-03

1.30E-13

16.9

57.6

19.9 ± 0.1

8

850

2.093

6.24E-02

3.09E-03

1.42E-13

19.5

55.4

18.0 ± 0.1

9

900

2.075

3.60E-02

3.29E-03

1.94E-13

23.1

52.0

16.8 ± 0.1

10

950

1.943

2.23E-02

3.21E-03

3.41E-13

29.3

49.9

15.1 ± 0.1

11

950

1.943

2.23E-02

3.21E-03

3.41E-13

35.5

49.9

15.1 ± 0.1

12

1050

1.648

1.39E-02

2.40E-03

8.16E-13

50.4

55.4

14.2 ± 0.1

13

1100

1.546

1.76E-02

1.84E-03

8.01E-13

65.0

63.3

15.2 ± 0.1

14

1130

1.469

1.00E-02

1.54E-03

9.98E-13

83.2

67.3

15.4 ± 0.0

15

1160

1.482

7.04E-03

1.51E-03

7.68E-13

97.2

68.2

15.7 ± 0.1

16

1220

1.942

2.96E-02

2.54E-03

9.82E-14

99.0

60.2

18.2 ± 0.2

17

1220

2.348

1.89E-02

4.46E-03

5.24E-14

100

42.8

15.6 ± 0.2