ANG-1-11400 K-feldspar (J = 0.000438) Total gas age = 0.97 ± 0.01 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

41.22

2.76E-02

1.20E-01

5.90E-15

2.30

14.1

4.58 ± 0.12

2

500

4.223

1.17E-01

9.49E-03

9.75E-15

6.10

33.7

1.12 ± 0.03

3

550

1.970

2.45E-02

4.67E-03

1.00E-14

10.0

29.8

0.46 ± 0.01

4

600

2.119

9.24E-03

4.69E-03

9.75E-15

13.8

34.4

0.58 ± 0.01

5

650

2.122

8.94E-03

4.39E-03

1.00E-14

17.7

38.7

0.65 ± 0.01

6

700

1.980

9.78E-03

4.06E-03

9.24E-15

21.3

39.2

0.61 ± 0.02

7

750

2.905

4.18E-02

5.51E-03

1.87E-14

28.6

43.9

1.01 ± 0.01

8

800

2.089

8.20E-03

3.50E-03

1.10E-14

32.9

50.3

0.83 ± 0.01

9

850

1.849

3.13E-03

2.52E-03

2.87E-14

44.1

59.6

0.87 ± 0.01

10

900

1.661

5.09E-03

1.80E-03

6.39E-14

69.0

67.8

0.89 ± 0.01

11

950

1.810

5.48E-02

2.05E-03

3.59E-14

83.0

66.6

0.95 ± 0.01

12

1000

1.933

3.20E-03

2.24E-03

2.85E-14

94.1

65.6

1.00 ± 0.01

13

1050

2.069

1.08E-02

2.50E-03

8.47E-15

97.4

64.2

1.05 ± 0.02

14

1100

2.258

3.27E-02

3.36E-03

2.82E-15

98.5

56.0

1.00 ± 0.05

15

1200

2.632

4.79E-02

4.19E-03

1.80E-15

99.2

53.0

1.10 ± 0.07

16

1400

3.716

8.99E-01

7.74E-03

2.31E-15

100

39.8

1.17 ± 0.06