LF-23-9800 K-feldspar (J = 0.0004013) Total gas age = 0.95 ± 5.34 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age + 1s

(Ma)

1

450

285.0

9.05E-01

1.64E-15

0.167

6.13

12.62 ± 3.09

2

450

188.2

6.45E-01

5.65E-16

0.225

-1.36

-

3

500

105.0

3.13E-01

1.76E-15

0.404

11.9

9.03 ± 1.02

4

500

58.50

1.95E-01

1.41E-15

0.547

1.39

0.59 ± 0.80

5

550

53.03

1.41E-01

3.98E-15

0.953

21.5

8.28 ± 0.44

6

550

24.32

8.04E-02

4.54E-15

1.42

2.28

0.40 ± 0.30

7

600

21.89

5.82E-02

9.22E-15

2.36

21.2

3.37 ± 0.27

8

650

26.91

8.14E-02

1.30E-14

3.68

10.5

2.06 ± 0.26

9

650

24.40

7.98E-02

8.44E-15

4.54

3.24

0.57 ± 0.24

10

675

49.97

1.67E-01

7.86E-15

5.34

1.22

0.44 ± 0.36

11

700

37.43

1.22E-01

4.26E-15

5.78

3.54

0.97 ± 0.51

12

700

22.27

7.12E-02

8.04E-15

6.60

5.40

0.87 ± 0.22

13

750

13.32

3.94E-02

1.78E-14

8.42

12.4

1.20 ± 0.09

14

750

13.35

4.23E-02

1.37E-14

9.81

6.34

0.62 ± 0.12

15

800

9.903

3.00E-02

1.77E-14

11.6

10.4

0.75 ± 0.08

16

800

11.13

3.37E-02

1.22E-14

12.9

10.4

0.84 ± 0.12

17

850

7.350

2.27E-02

2.26E-14

15.2

8.63

0.46 ± 0.07

18

900

4.562

1.33E-02

4.76E-14

20.0

13.5

0.45 ± 0.03

19

950

5.245

1.53E-02

4.60E-14

24.7

13.3

0.51 ± 0.04

20

1000

4.232

1.12E-02

5.32E-14

30.1

21.7

0.67 ± 0.04

21

1050

3.266

6.81E-03

1.18E-13

42.2

38.0

0.90 ± 0.02

22

1100

3.332

6.83E-03

8.29E-14

50.6

39.1

0.94 ± 0.02

23

1100

3.001

5.71E-03

6.92E-14

57.7

43.3

0.94 ± 0.02

24

1000

6.347

1.73E-02

1.39E-14

59.1

19.1

0.89 ± 0.08

25

1200

1.866

2.06E-03

2.86E-13

88.3

66.7

0.90 ± 0.01

26

1233

2.537

4.02E-03

8.88E-14

97.3

52.6

0.97 ± 0.01

27

1350

4.849

9.83E-03

2.65E-14

100

39.7

1.40 ± 0.08