FF52-9140 Biotite (J = 0.000432) Total gas age = 1.14 ± 0.03 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

101.3

4.38E-01

3.31E-01

2.39E-15

1.70

3.40

2.68 ± 0.33

2

500

36.48

2.79E±00

1.19E-01

5.48E-15

5.60

4.00

1.13 ± 0.17

3

525

19.36

1.33E±00

6.13E-02

5.62E-15

9.60

6.80

1.03 ± 0.14

4

550

13.06

1.77E±00

4.01E-02

9.70E-15

16.5

10.0

1.02 ± 0.08

5

575

11.67

1.15E±00

3.51E-02

6.47E-15

21.1

11.7

1.07 ± 0.12

6

600

11.50

1.04E±00

3.49E-02

9.98E-15

28.2

10.9

0.98 ± 0.08

7

650

10.65

1.72E-01

3.18E-02

1.48E-14

38.7

11.8

0.98 ± 0.06

8

700

13.56

1.62E-01

4.16E-02

1.56E-14

49.8

9.50

1.00 ± 0.06

9

750

23.37

1.53E-01

7.42E-02

1.67E-14

61.7

6.20

1.14 ± 0.08

10

775

16.61

9.09E-01

5.14E-02

1.14E-14

69.8

8.90

1.15 ± 0.08

11

800

15.45

3.02E±00

4.80E-02

6.04E-15

74.1

9.30

1.12 ± 0.13

12

850

12.05

9.58E-01

3.64E-02

2.49E-14

91.8

11.2

1.05 ± 0.04

13

875

10.90

7.10E-01

3.20E-02

8.01E-15

97.5

13.7

1.16 ± 0.10

14

900

31.02

1.13E±01

1.05E-01

9.84E-16

98.2

2.00

0.49 ± 0.73

15

950

31.42

2.15E±00

1.01E-01

1.26E-15

99.1

5.20

1.26 ± 0.62

16

1050

67.53

1.17E±01

2.21E-01

9.84E-16

100

4.30

2.27 ± 0.76

17

1150

337.6

3.72E±01

9.81E-01

1.41E-16

100

14.8

39.39 ± 9.80

18

1250

764.4

7.29E±01

2.46E±00

0.00E±00

100

5.50

34.19 ± 63.41