ANG-1-11440 K-feldspar (J = 0.000436) Total gas age = 0.96 ± 0.01 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

48.79

2.98E-01

1.45E-01

6.73E-15

2.60

12.5

4.78 ± 0.15

2

500

7.527

1.02E-01

2.21E-02

7.51E-15

5.50

13.2

0.78 ± 0.04

3

550

4.991

1.52E-01

1.47E-02

1.42E-14

11.0

13.3

0.52 ± 0.02

4

600

4.898

1.25E-02

1.54E-02

1.06E-14

15.1

6.90

0.26 ± 0.02

5

650

7.555

1.05E-02

2.35E-02

8.80E-15

18.5

8.00

0.47 ± 0.03

6

700

7.119

7.42E-02

2.22E-02

6.73E-15

21.1

7.80

0.44 ± 0.03

7

750

4.197

7.70E-03

1.06E-02

1.40E-14

26.5

25.0

0.83 ± 0.01

8

800

3.517

8.66E-02

8.14E-03

1.53E-14

32.4

31.6

0.88 ± 0.01

9

850

2.108

2.35E-02

3.26E-03

3.81E-14

47.1

54.2

0.90 ± 0.01

10

900

1.714

1.55E-02

1.77E-03

6.60E-14

72.6

69.2

0.93 ± 0.01

11

950

1.938

1.78E-02

2.28E-03

3.31E-14

85.4

65.1

0.99 ± 0.01

12

1000

2.305

6.55E-02

3.59E-03

1.97E-14

93.0

54.0

0.98 ± 0.01

13

1100

3.161

8.15E-03

6.28E-03

1.14E-14

97.4

41.2

1.03 ± 0.01

14

1200

3.630

3.16E-02

7.22E-03

2.85E-15

98.5

41.2

1.18 ± 0.04

15

1400

5.267

2.94E-02

1.24E-02

3.11E-15

99.7

30.4

1.26 ± 0.04

16

1500

8.442

1.09E-01

2.17E-02

7.77E-16

100

24.0

1.59 ± 0.15