LF-23-9540 K-feldspar (J = 0.000428) Total gas age = 1.02 ± 0.01 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

22.91

1.89E±00

6.79E-02

5.12E-15

2.30

12.9

2.28 ± 0.09

2

500

12.35

3.48E-01

3.98E-02

9.35E-15

6.50

4.90

0.47 ± 0.05

3

525

15.01

3.27E-01

5.03E-02

4.67E-15

8.60

1.20

0.13 ± 0.08

4

550

16.88

3.42E-01

5.57E-02

4.45E-15

10.6

2.60

0.34 ± 0.09

5

575

17.47

7.01E-01

5.81E-02

4.90E-15

12.8

2.00

0.27 ± 0.08

6

600

18.97

3.33E-01

6.31E-02

4.67E-15

14.9

1.80

0.27 ± 0.09

7

625

19.67

4.47E-01

6.53E-02

3.56E-15

16.5

2.10

0.32 ± 0.11

8

650

15.26

5.43E±00

4.95E-02

3.56E-15

18.1

6.30

0.74 ± 0.10

9

675

16.10

1.81E±00

5.29E-02

2.89E-15

19.4

3.50

0.44 ± 0.13

10

700

11.60

1.37E±00

3.61E-02

4.01E-15

21.2

8.80

0.79 ± 0.09

11

725

12.31

5.08E±00

3.82E-02

3.34E-15

22.7

10.9

1.04 ± 0.11

12

750

28.76

7.33E±00

9.48E-02

3.12E-15

24.1

4.10

0.92 ± 0.14

13

775

9.339

6.11E-01

2.70E-02

6.68E-15

27.1

14.9

1.07 ± 0.06

14

800

6.006

1.45E-01

1.55E-02

1.09E-14

32.0

23.7

1.10 ± 0.03

15

825

3.106

3.89E-01

5.45E-03

1.02E-14

36.6

48.8

1.17 ± 0.03

16

850

2.406

1.07E-01

3.18E-03

1.49E-14

43.3

61.1

1.13 ± 0.02

17

875

1.772

7.96E-02

1.15E-03

2.00E-14

52.3

80.8

1.11 ± 0.02

18

876

1.724

9.00E-02

9.25E-04

1.78E-14

60.3

84.2

1.12 ± 0.02

19

900

1.619

2.09E-02

6.03E-04

2.63E-14

72.1

88.8

1.11 ± 0.01

20

925

1.653

6.07E-02

6.43E-04

2.63E-14

83.9

88.5

1.13 ± 0.01

21

950

1.796

1.16E-01

9.84E-04

1.38E-14

90.1

84.0

1.16 ± 0.03

22

1000

1.961

1.47E-01

1.39E-03

1.09E-14

95.0

79.3

1.20 ± 0.03

23

1100

2.256

2.13E-01

2.37E-03

7.57E-15

98.4

69.3

1.21 ± 0.05

24

1200

2.489

1.47E±00

3.07E-03

3.56E-15

100

67.0

1.29 ± 0.10